Veerendra

NCERT Extra Questions for Class 7 English: Here we are providing NCERT Extra Questions for Class 7 English Honeycomb, An Alien Hand. Students can get Class 7 English NCERT Solutions, Chapter Wise CBSE Class 7 English Extra Important Questions and Answers were designed by subject expert teachers.

Candidates can get all lessons important questions for class 7 English as free PDF downloads from this article. By accessing these pdf links of CBSE class 7 English extra questions with answers you can easily grasp the concept & enhance your exam preparation. This helps you to score well in your upcoming CBSE class 7 annual exams. Practicing daily from these class 7 English extra questions can improve your English grammar & conceptual knowledge.

Extra Questions for Class 7 English Honeycomb, An Alien Hand Important Questions

The Important Extra Questions for Class 7 English NCERT CBSE Board PDF can be downloaded simply by clicking on the direct access links given below.

Extra Questions for Class 7 English Honeycomb Prose

1. Three Questions Extra Questions
2. A Gift of Chappals Extra Questions
3. Gopal and the Hilsa-Fish Extra Questions
4. The Ashes that Made Trees Bloom Extra Questions
5. Quality Extra Questions
6. Expert Detectives Extra Questions
7. The Invention of Vita Wonk Extra Questions
8. Fire: Friend and Foe Extra Questions
9. A Bicycle in Good Repair Extra Questions
10. The Story of Cricket Extra Questions Extra Questions

Extra Questions for Class 7 English Honeycomb Poem

1. The Squirrel Extra Questions
2. The Rebel Extra Questions
3. The Shed Extra Questions
4. Chivvy Extra Questions
5. Trees Extra Questions
6. Mystery of the Talking Fan Extra Questions
7. Dad and the Cat and the Tree Extra Questions
8. Meadow Surprises Extra Questions
9. Garden Snake Extra Questions

Extra Questions for Class 7 English An Alien Hand

1. The Tiny Teacher Extra Questions
2. Bringing up Kari Extra Questions
3. The Desert Extra Questions
4. The Cop and the Anthem Extra Questions
5. Golu Grows a Nose Extra Questions
6. I Want Something in a Cage Extra Questions
7. Chandni Extra Questions
8. The Bear Story Extra Questions
9. A Tiger in the House Extra Questions
10. An Alien Hand Extra Questions 

If you have any doubt or question regarding NCERT Extra Questions for Class 7 English Honeycomb, An Alien Hand, you can reach out to us in the comment section below and we will get back to you as soon as possible.

Download NCERT Extra Questions for Class 10 Science for free: Here we are providing NCERT Extra Questions for Class 10 Science with Solutions Answers Chapter Wise Pdf free download. Students can get Class 10 Science NCERT Solutions, CBSE Class 10 Science Important Extra Questions and Answers designed by subject expert teachers.

Candidates who are studying under CBSE, UP, MP, Gujarat boards, and in search of NCERT Extra Questions Class 10 Science with Solutions Pdf reached the right page. Here, we have given NCERT Class 10th Science Extra Questions in pdf format. Students can get chapter-wise CBSE Extra Questions and Answers for 10th Class Science based on the NCERT syllabus which are designed by subject expert teachers from here.

NCERT Extra Questions for Class 10 Science with Answers Pdf

Available CBSE NCERT Chapter Wise Extra Questions for Class 10 Science with answers and solutions Pdf will surely encourage students to secure graceful marks in the board examinations. Access the below links & practice well for your science examination.

1. Chemical Reactions and Equations Class 10 Extra Questions
2. Acids Bases and Salts Class 10 Extra Questions
3. Metals and Non-metals Class 10 Extra Questions
4. Carbon and its Compounds Class 10 Extra Questions
5. Periodic Classification of Elements Class 10 Extra Questions
6. Life Processes Class 10 Extra Questions
7. Control and Coordination Class 10 Extra Questions
8. How do Organisms Reproduce Class 10 Extra Questions
9. Heredity and Evolution Class 10 Extra Questions
10. Light Reflection and Refraction Class 10 Extra Questions
11. Human Eye and Colourful World Class 10 Extra Questions
12. Electricity Class 10 Extra Questions
13. Magnetic Effects of Electric Current Class 10 Extra Questions
14. Sources of Energy Class 10 Extra Questions
15. Our Environment Class 10 Extra Questions
16. Management of Natural Resources Class 10 Extra Questions

We hope the given CBSE NCERT Chapter Wise Extra Questions for Class 10 Science with answers and solutions will help you. If you have any query regarding CBSE Class 10 Science Important Extra Questions and Answers, drop a comment below and we will get back to you at the earliest.

NCERT Extra Questions for Class 10 Maths in PDF: Here we are providing NCERT Extra Questions for Class 10 Maths with Solutions Answers Chapter Wise Pdf free download. Students can get Class 10 Maths NCERT Solutions, CBSE Class 10 Maths Important Extra Questions and Answers designed by subject expert teachers.

To understand important SSC Maths concepts & solve any type of questions in the board exams, we have come up with an amazing & effective exam resource ie., class 10th maths extra questions and answers pdf. This NCERT extra questions of maths class 10 pdf cover all important topics chapterwise along with detailed solution steps. You can also Download CBSE class 10 maths extra questions with solutionss Pdf to revise the complete Syllabus and score more marks in your examinations.

Class 10 Maths Extra Questions with Solutions Answers

Make sure to download chapterwise Class 10 Maths NCERT CBSE Extra important questions solution pdf via available quick links for rigorous practice.

1. Real Numbers Class 10 Extra Questions
2. Polynomials Class 10 Extra Questions
3. Pair of Linear Equations in Two Variables Class 10 Extra Questions
4. Quadratic Equations Class 10 Extra Questions
5. Arithmetic Progressions Class 10 Extra Questions
6. Triangles Class 10 Extra Questions
7. Coordinate Geometry Class 10 Extra Questions
8. Introduction to Trigonometry Class 10 Extra Questions
9. Some Applications of Trigonometry Class 10 Extra Questions
10. Circles Class 10 Extra Questions
11. Constructions Class 10 Extra Questions
12. Areas Related to Circles Class 10 Extra Questions
13. Surface Areas and Volumes Class 10 Extra Questions
14. Statistics Class 10 Extra Questions
15. Probability Class 10 Extra Questions

We hope the given NCERT Extra Questions for Class 10 Maths with Solutions Answers Chapter Wise Pdf free download will help you. If you have any queries regarding CBSE Class 10 Maths Important Extra Questions and Answers, drop a comment below and we will get back to you at the earliest.

NCERT CBSE Extra Questions for Class 11 English: Here we are providing NCERT Extra Questions for Class 11 English Hornbill and Snapshots. Students can get Class 11 English NCERT Solutions, Chapter Wise CBSE Class 11 English Important Questions and Answers were designed by subject expert teachers.

Students can also visit the most accurate and elaborate NCERT Solutions for Class 11 English. Every question of the textbook has been answered here.

Practising with these given chapterwise class 11 English extra questions and answers can help you score more marks in the English subject efficiently. These Free PDF NCERT Extra Questions Solutions for CBSE Class 11 English are designed by expert teachers from the latest edition of CBSE (NCERT) books. The questions are compiled in a systematic manner and come from each and every chapter of class 11 English.

Extra Questions for Class 11 English Hornbill and Snapshots Important Questions

Students are advised to practice these Class 11 English NCERT Extra Important Questions along with other exam resources to ace the exam with colorful grades. Use the quick links available here and download chapterwise NCERT Extra Questions for Class 11 English in Pdf format.

Extra Questions for Class 11 English Hornbill Prose

1. The Portrait of a Lady Extra Questions
2. We’re Not Afraid to Die… If We Can All Be Together Extra Questions
3. Discovering Tut: The Saga Continues Extra Questions
4. Landscape of the Soul Extra Questions
5. The Ailing Planet: the Green Movement’s Role Extra Questions
6. The Browning Version Extra Questions
7. The Adventure Extra Questions
8. Silk Road Extra Questions

Extra Questions for Class 11 English Hornbill Poem

1. A Photograph Extra Questions
2. The Laburnum Top Extra Questions
3. The Voice of the Rain Extra Questions
4. Childhood Extra Questions
5. Father to Son Extra Questions

Extra Questions for Class 11 English Snapshots

• The Summer of the Beautiful White Horse Extra Questions
• The Address Extra Questions
• Ranga’s Marriage Extra Questions
• Albert Einstein at School Extra Questions
• Mother’s Day Extra Questions
• The Ghat of the Only World Extra Questions
• Birth Extra Questions
• The Tale of Melon City Extra Questions

We hope the given Chapter Wise NCERT Extra Questions for Class 11 English Important Questions of Hornbill and Snapshots will help you. If you have any queries regarding Chapter Wise CBSE Class 11 English Important Questions and Answers, drop a comment below and we will get back to you at the earliest.

CBSE Extra Questions for Class 10 English Free PDF Download: Here we are providing NCERT Extra Questions for Class 10 English First Flight, Footprints Without Feet, Literature Reader. Students can get Class 10 English NCERT Solutions, Chapter Wise CBSE Class 10 English Important Questions and Answers were designed by subject expert teachers.

Chapter-wise NCERT Extra Important Questions for Class 10 English with solutions are designed by expert teachers from the latest edition of NCERT books to score great marks in board exams. Here we have compiled NCERT Extra Questions for Class 10 English for all lessons in pdf format. To ace up your exam preparation, CBSE important questions & answers pdf is the best exam resource to score high marks in the examination.

Extra Questions for Class 10 English Beehive, Moments, Literature Reader Important Questions

Make use of these below pdf links to download chapter wise CBSE important questions for class 10 English & pave your exam preparation efficiently.

Extra Questions for Class 10 English Literature Reader

1. Two Gentlemen of Verona Extra Questions
2. Mrs. Packletide’s Tiger Extra Questions
3. The Letter Extra Questions
4. A Shady Plot Extra Questions
5. Patol Babu, Film Star Extra Questions
6. Virtually True Extra Questions
7. The Frog and the Nightingale Extra Questions
8. Mirror Extra Questions
9. Not Marble, Nor the Gilded Monuments Extra Questions
10. Ozymandias Extra Questions
11. The Rime of the Ancient Mariner Extra Questions
12. Snake Extra Questions
13. The Dear Departed Extra Questions
14. Julius Caesar Extra Questions
15. From the Diary of Anne Frank Extra Questions
16. The Story of My Life Extra Questions

Extra Questions for Class 10 English First Flight Prose

1. A Letter to God Extra Questions
2. Nelson Mandela: Long Walk to Freedom Extra Questions
3. Two Stories about Flying Extra Questions
4. From the Diary of Anne Frank Extra Questions
5. The Hundred Dresses Part 1 Extra Questions
6. The Hundred Dresses Part 2 Extra Questions
7. Glimpses of India Extra Questions
8. Mijbil the Otter Extra Questions
9. Madam Rides the Bus Extra Questions
10. The Sermon at Benares Extra Questions
11. The Proposal Extra Questions

Extra Questions for Class 10 English First Flight Poem

1. Dust of Snow Extra Questions
2. Fire and Ice Extra Questions
3. A Tiger in the Zoo Extra Questions
4. How to Tell Wild Animals Extra Questions
5. The Ball Poem Extra Questions
6. Amanda Extra Questions
7. Animals Extra Questions
8. The Trees Extra Questions
9. Fog Extra Questions
10. The Tale of Custard the Dragon Extra Questions
11. For Anne Gregory Extra Questions

Extra Questions for Class 10 English Footprints Without Feet

1. A Triumph of Surgery Extra Questions
2. The Thief’s Story Extra Questions
3. The Midnight Visitor Extra Questions
4. A Question of Trust Extra Questions
5. Footprints without Feet Extra Questions
6. The Making of a Scientist Extra Questions
7. The Necklace Extra Questions
8. The Hack Driver Extra Questions
9. Bholi Extra Questions
10. The Book that Saved the Earth Extra Questions

If you have any doubts or questions regarding NCERT Extra Questions for Class 10 English First Flight, Footprints Without Feet, Literature Reader, you can reach out to us in the comment section below and we will get back to you as soon as possible.

Here we are providing Real Numbers Class 10 Extra Questions Maths Chapter 1 with Answers Solutions, Extra Questions for Class 10 Maths was designed by subject expert teachers. https://ncertmcq.com/extra-questions-for-class-10-maths/

Extra Questions for Class 10 Maths Real Numbers with Answers Solutions

Extra Questions for Class 10 Maths Chapter 1 Real Numbers with Solutions Answers

Real Numbers Class 10 Extra Questions Very Short Answer Type

Real Numbers Class 10 Extra Questions Question 1.
What is the HCF of the smallest composite number and the smallest prime number?
Solution:
Smallest composite number = 4
Smallest prime number = 2
So, HCF (4, 2) = 2

Class 10 Maths Chapter 1 Extra Questions Question 2.
The decimal representation of \(\frac{6}{1250}\) will terminate after how many places of decimal?
Solution:

This representation will terminate after 4 decimal places.

Extra Questions For Class 10 Maths Chapter 1 Question 3.
If HCF of a and b is 12 and product of these numbers is 1800. Then what is LCM of these numbers?
Solution:
Product of two numbers = Product of their LCM and HCF
⇒ 1800 = 12 × LCM
⇒ LCM = \(\frac{1800}{12}\) = 150.

Class 10 Real Numbers Extra Questions Question 4.
What is the HCF of 3³ × 5 and 3² × 5²?
Solution:
HCF of 3³ × 5 and 3² × 5² = 3² × 5 = 45

Real Numbers Class 10 Extra Questions With Answers Question 5.
if a is an odd number, b is not divisible by 3 and LCM of a and b is P, what is the LCM of 3a and 2b?
Solution:
6P

Extra Questions On Real Numbers Class 10 Question 6.
If P is prime number then, what is the LCM of P, P², P³?
Solution:
P³

Extra Questions Of Real Numbers Class 10 Question 7.
Two positive integers p and q can be expressed as p = ab² and q = a²b, a and b are prime numbers. What is the LCM of p and q?
Solution:
a²h²

Class 10 Maths Ch 1 Extra Questions Question 8.
A number N when divided by 14 gives the remainder 5. What is the remainder when the same
number is divided by 7?
Solution:
5, because 14 is multiple of 7.
Therefore, remainder in both cases are same.

Real Numbers Extra Questions Question 9.
Examine whether \(\frac{17}{30}\) is a terminating decimal or not.
Solution:

Since the denominator has 3 as its factor.
∴ \(\frac{17}{30}\) is a non4ermznatlng decimal.

Real Numbers Class 10 Important Questions With Solutions Question 10.
What are the possible values of remainder r, when a positive integer a is divided by 3?
Solution:
According to Euclid’s division lemma
a = 3q + r, where O r < 3 and r is an integer.
Therefore, the values of r can be 0, 1 or 2.

Chapter 1 Maths Class 10 Extra Questions Question 11.
A rational number in its decimal expansion is 1.7351. What can you say about the prime factors of q when this number is expressed in the form \(\frac{p}{q}\) ? Give reason.
Solution:
As 1.7351 is a terminating decimal number, so q must be of the form 2^m 5ⁿ, where in, n are natural numbers.

Real Numbers Class 10 Important Questions With Solutions 2021 Question 12.
Without actually performing the long division, find \(\frac{987}{10500}\) will have terminating or non.terminating repeating decimal expansion. Give reason for your answer.
Solution:
\(\frac{987}{10500}\) = \(\frac{47}{500}\) and 500 = 2² × 5³, so it has terminating decimal expansion.

Real Numbers Class 10 Extra Questions Short Answer Type 1

Maths Class 10 Chapter 1 Extra Questions Question 1.
Can the number 4ⁿ, n be a natural number, end with the digit 0? Give reason.
Solution:
if 4ⁿ ends with 0, then it must have 5 as a factor. But, (4)ⁿ = (2²)ⁿ = 2²ⁿ i.e., the only prime factor
of 4ⁿ is 2. Also, we know from the fundamental theorem of arithmetic that the prime factorization of each number is unique.
∴ 4ⁿ can never end with 0.

Real Numbers Class 10 Extra Questions 2021 Question 2.
Write whether the square of any positive integer can be of the form 3m + 2, where m is a natural number. Justify your answer.
Solution:
No, because any positive integer can be written as 3q, 3q + 1, 3q + 2, therefore, square will be
9q² = 3m, 9q² + 6q + 1 = 3(3q²+ 2q) + 1 = 3m + 1,
9q² + 12q + 4 = 3(3q²+ 4q + 1) + 1 = 3m + 1.

Real Numbers Extra Questions For Class 10th Question 3.
Can two numbers have 18 as their HCF and 380 as their LCM? Give reason.
Solution:
No, because here HCF (18) does not divide LCM (380).

Ch 1 Maths Class 10 Extra Questions Question 4.
Write a rational number between √3 and √5.
Solution:
A rational number between √3 and √5 is √3.24 = 1.8 = \(\frac{18}{10}\) = \(\frac{9}{5}\)

Ncert Class 10 Maths Chapter 1 Extra Questions Question 5.
The product of two consecutive integers is divisible by 2. Is this statement true or false? Give reason.
Solution:
True, because n(n + 1) will always be even, as one out of the n or n+ 1 must be even.

Class 10 Maths Real Numbers Extra Questions Question 6.
Explain why 3 × 5 × 7 + 7 is a composite number.
Solution:
3 × 5 × 7 + 7 = 7(3 × 5 + 1) = 7 × 16, which has more than two factors.

Class 10 Maths Extra Questions Chapter 1 Question 7.
What is the least number that is divisible by all the numbers from 1 to 10?
Solution:
Required number = LCM of 1, 2, 3, … 10 = 2520

Class 10th Maths Chapter 1 Extra Questions Question 8.
Find the sum \(0 . \overline{68}\) + \(0 . \overline{73}\).
Solution:

Chapter 1 Class 10 Maths Extra Questions Question 9.
“The product of three consecutive positive integers is divisible by 6”. Is this statement true or false? Justify your answer.
Solution:
True, because n(n + 1) (n + 2) will always be divisible by 6, as at least one of the factors will be divisible by 2 and at least one of the factors will be divisible by 3.

Real Numbers Class 10 Extra Questions Short Answer Type 2

Question 1.
An army contingent of 616 members is to march behind an army band of 32 members in a parade. The two groups are to march in the same number of columns. What is the maximum number of columns in which they can march?
Solution:
For the maximum number of columns, we have to find the HCF of 616 and 32.
Now, since 616 > 32, we apply division lemma to 616 and 32.
We have, 616 = 32 × 19 + 8
Here, remainder 8 ≠ O. So, we again apply division lemma to 32 and 8.
We have, 32 = 8 × 4 + O
Here, remainder is zero. So, HCF (616, 32) = 8
Hence, maximum number of columns is 8.

Question 2.
Find the LCM and HCF of 12, 15 and 21 by applying the prime factorisation method.
Solution:
The prime factors of 12, 15 and 21 are
12 2² × 3, 15 = 3 × 5 and 21 = 3 × 7
Therefore, the HCF of these integers is 3.
2², 3¹, 5¹ and 7¹ and are the greatest powers involved in the prime factors of 12, 15 and 21.
So, LCM (12, 15, 21) = 2² × 3¹ × 5¹ × 7¹ = 420.

Question 3.
Find the LCM and HCF of the following pairs of integers and verify that LCM × HCF = product of the two numbers.
(1) 26 and 91 (ii) 198 and 144
Solution:
(i) We have, 26 = 2 × 13 and 91 = 7 × 13
Thus, LCM (26, 91) = 2 × 7 × 13 = 182
HCF (26, 91) = 13
Now, LCM (26, 91) × HCF (26, 91) = 182 × 13 = 2366
and Product of the two numbers = 26 × 91 = 2366
Hence, LCM × HCF = Product of two numbers.

(ii) 144 = 24 × 32 and 198 = 2 × 32 × 11
∴ LCM(198,144)2⁴ × 3² × 11 = 1584
HCF(198, 144) = 2 × 3² = 18
Now, LCM (198, 144) × HCF (198, 144) = 1584 × 18 = 28512
and product of 198 and 144 = 28512
Thus, product of LCM (198, 144) and HCF (198, 144)
= Product of 198 and 144.

Question 4.
There is a circular path around a sports field. Sonia takes 18 minutes to drive one round of the field, while Ravi takes 12 minutes for the same. Suppose they both start from the same point and at the same time, and go in the same direction. After how many minutes will they meet again at the starting point?
Solution:
To find the time after which they meet again at the starting point, we have to find LCM of 18 and 12 minutes. We have

Therefore, LCM of 18 and 12 = 2² × 3² = 36
So, they will meet again at the starting point after 36 minutes.

Question 5.
Write down the decimal expansiwns of the following numbers:
(i) \(\frac{35}{50}\) (ii) \(\frac{15}{1600}\)
Solution:
(i)

(ii)

Question 6.
Express the number \(0.3 \overline{178}\) in the form of rational number \(\frac{a}{b}\)
Solution:
Let x = \(0.3 \overline{178}\)
then x = 0.3178178178 … … (1)
10x = 3.178178178 … …(ii)
10000x = 3178.178178… …(iii)
On subtracting (ii) from (iii), we get

Question 7.
If n is an odd positive integer, show that (n² – 1) is divisible by 8.
Solution:
We know that an odd positive integer n is of the form (4q + 1) or (4 + 3) for some integer q.
Case – I When n = (4q + 1)
In this case n² – 1 = (4q + 1)²1 = 16q² + 8q = 8q(2q + 1)
which is clearly divisible by 8.

Case – II When n = (4q + 3)
In this case, we have
n2² = (4q + 3)² – 1 = 16q² + 24q + 8 = 8(2q²+ 3q + 1)
which is clearly divisible by 8.
Hence (n² – 1) is divisible by 8.

Question 8.
The LCM of two numbers is 14 times their HCF. The sum of LCM and HCF is 600. If one
number is 280, then find the other number.
Solution:
Let HCF of the numbers hex then according to question LCM of the number will be 14x
And x + 14 = 600 ⇒ 15x = 600 ⇒ x = 40
Then HCF = 40 and LCM = 14 × 40 = 560
∵ LCM × HCF = Product of the numbers
560 × 40 = 280 × Second number Second number = \(\frac{560 \times 40}{280}\) = 80
Then other number is 80

Question 9.
Find the value of x, y and z in the given factor tree. Can the value of ‘x’ be found without finding the value of ‘y’ and ‘z’? If yes, explain.

Solution:
z = 2 × 17 = 34; y = 34 × 2 = 68 and x = 2 × 68 = 136
Yes, value of x can be found without finding value of y or z as
x = 2 × 2 × 2 × 17 which arc prime 1tctors of x.

Question 10.
Show that any positive odd integer is of the form 6q + 1 or 6q + S or 6q + 5 where q is some integer.
Solution:
Let a he any positive odd integer and h = 6. Then, by Euclid’s algorithm, a = 6q + r, for some
integer q ≥ O and O ≤ r < 6.
i.e., the possible remainders are 0, 1, 2, 3, 4, 5.
1’hus,a canbeoftheform6q,or6q + I,or6q + 2,orßq + 3,ör6q + 4,
or 6q + 5, where q is some quotient.
Since a. is odd integer, so a cannot be of the form , or + 2, or 6q + 4, (since they are even).
Thus, a is of the form 6q + 1, 6q + 3, or 6q + 5, where q is some integer.
Hence, any odd positive integer is of the form 6q + 1 or 6q -1- 3 or 6q + 5, where q is sorne integer.

Question 11.
The decimal expansions of some real numbers are given below. In each case, decide whether they are rational or not. If they are rational, write it in the form \(\frac{p}{q}\). What can you say about the prime factors of q?
(i) 0.140140014000140000… (ii) \(0 . \overline{16}\)
Solution:
(i) We have, 0.140140014000140000… a non-terminating and non-repeating decimal expansion. So it is irrational. It cannot be written in the form of \(\frac{p}{q}\)

(ii) We have, \(0 . \overline{16}\) a non-terminating but repeating decimal expansion. So it is rational.
Let x = \(0 . \overline{16}\)
Then, x = 0.1616… (i)
100×16.1616… ..(ii)
On subtracting (i) from (ii), we get
100x – x = 16.1616 – 0.1616
⇒ 99x = 16 ⇒ x = \(\frac{16}{99}\) = \(\frac{p}{q}\)
The denominator (q) has factors other than 2 or 5.

Real Numbers Class 10 Extra Questions Long Answer Type 1

Question 1.
Use Euclid’s division lemma to show that the square of any positive integer is either of the form 3m or 3m + 1 for some integer m.
Solution:
Let a be an arbitrary positive integer.
Then by Euclid’s division algorithm, corresponding to the positive integers a and 3 there exist
non-negative integers q and r such that
a = 3q + r where 0 ≤ r <3
a² = 9q² + 6qr + r² ….(i) 0 ≤ r <3

Case – I: When r = 0 [putting in (i)]
a² = 9q² = 3(3q²) = 3m where m = 3q²

Case – II: r = 1
a² = 9q²+6q + 1 = 3(3q² + 2q)+ 1 = 3m + 1 where m = 3q² + 2q

Case – III: r = 2
a² = 9q² + 12 + 4 = 3(3q² + 4q + 1) + 1 = 3m + 1 where m = (3q² + 4q + 1)
Hence, square of any positive integer is either of the form 3m or 3m + 1 for some integer m.

Question 2.
Show that one and only one out of n, n + 2, n + 4 is divisible by 3, where n is any positive integer.
Solution:
Let q be the quotient and r be the remainder when n is divided by 3.
Therefore, n = 3q + r, where r = 0, 1, 2
n = 3q or n = 3q + 1 or n = 3q + 2
Case (i) if n = 3q, then n is divisible by 3, n + 2 and n +. 4 arc not divisible by 3.
Case (ii) if 71 = 3q + 1 then n + 2 = 3q + 3 = 3(q + 1), which is divisible by 3 and
n + 4 = 3q + 5, which is not divisible by 3.
So, only (n + 2) is divisible by 3.
Case (iii) If n = 3q + 2, then n + 2 = 3q + 4, which is not divisible by 3 and
(n + 4) = 3q + 6 = 3(q + 2), which is divisible by 3.
So, only (n + 4) is divisible by 3.
Hence one and only one out of n, (n + 2), (n + 4), is divisible by 3.

Question 3.
Use Euclid’s division algorithm to find the HCF of:
(i) 960and432
(ii) 4052 and 12576.
Solution:
(j) Since 960 > 432, we apply the division lemma to 960 and 432.
We have, 960 = 432 × 2 + 96
Since the remainder 96 ≠ 0, so we apply the division lemma to 432 and 96.
We have, 432 = 96 × 4 + 48
Again remainder 48 ≠ 0 so we again apply division lemma to 96 and 48.
We have, 96 = 48 × 2 + O
The remainder has now become zero. So our procedure stops.
Since the divisor at this stage is 48.
Hence, HOE of 960 and 432 is 48.
i.e., HCF (960, 432) = 4H

(ii) Since 12576 > 4052, we apply the division lemma to 12576 and 4052, to get
12576 = 4052 × 3 + 420
Since the remainder 420 ≠ 0, we apply the division lemma to 4052 and 420, to get
4052 = 420 × 9 + 272
We consider the new divisor 420 and the new remainder 272, and apply the division lemma to get
420 = 272 × 1 + 148
We consider the new divisor 272 and the new remainder 148, and apply the division lemma to get
272 = 148 × 1 + 124
We consider the new divisor 148 and the new remainder 124, and apply the division lemma to get
148 = 124 × 1 + 24
We consider the new divisor 124 and the new remainder 24, and apply the division lemma to get
124 = 24 × 5 + 4
We consider the new divisor 24 and the new remainder 4, and apply the division lemma to get
24 = 4 × 6 + O
The remainder has now become zero, so our procedure stops. Since the divisor at this stage is 4, the HCF of 12576 and 4052 is 4.

Question 4.
Using prime factorisation method, find the HCF and LCM of 30, 72 and 432. Also show that HCF × LCM ≠ Product of the three numbers.
Solution:
Given members = 30, 72, 432 .
30 = 2 × 3 × 5; 7² = 2³ × 3² and 432 = 2⁴ × 3³
Here, 2’ and 31 are the smallest powers of the common factors 2 and 3 respectively.
So, HCF (30, 72, 432) = 2¹ × 3¹ = 2× 3 = 6
Again, 2, 33 and 51 arc the greatest powers of the prime factors 2, 3 and 5 respectively.
So, LCM (30, 72, 432) = 2⁴ × 3³ × 5¹ = 2160
HCF × LCM = 6 × 2160 = 12960
Product of numbers = 30 × 72 × 432 = 933120 .
Therefore, HCF × LCM ≠ Product of the numbers.

Question 5.
Prove that √7 is an irrational number.
Solution:
Let us assume, to the contrary, that √7 is a rational number.
Then, there exist co-prime positive integers and such that
√7 = \(\frac{a}{b}\) , b ≠ 0
So, a = √7 b
Squaring both sides, we have
a² = 7b² …… (i)
⇒ 7 divides a² ⇒ 7 divides a
So, we can write
a = 7c (where c is an integer)
Putting the value of a = 7c in (i), we have
49c² = 7b² 7² = b²
It means 7 divides b² and so 7 divides b.
So, 7 is a common factor of both a and b which is a contradiction.
So, our assumption that √7 is rational is wrong.
Hence, we conclude that √7 is an irrational number.

Question 6.
Show that 5 – √3 is an irrational number.
Solution:
Let us assume that 5 – √3 is rational.
So, 5 – √3 may be written as
5 – √3 = \(\frac{p}{q}\), where p and q are integers, having no common factor except 1 and q ≠ 0.
⇒ 5 – \(\frac{p}{q}\) = √3 ⇒ √3 = \(\frac{5 q-p}{q}\)
Since \(\frac{5 q-p}{q}\) is a rational number as p and q are integers.
∴ √3 is also a rational number which is a contradiction.
Thus, our assumption is wrong.
Hence, 5 – √3 is an irrational number.

Question 7.
Using Euclid’s division algorithm, find whether the pair of numbers 847,2160 are co-prime or not.
Solution:
Since 2160 > 847 we apply the division lemma to 2160 and 847
we have, 2160 847 × 2 + 466
Since remainder 466 ≠ 0. So, we apply the division lemma to 847 and 466
847 = 466 × 1+ 381
Again remainder 381 ≠ 0. So we again apply the division lemma to 466 and 381.
466 = 381 × 1 + 85
Again remainder 85 ≠0. So, we again apply the division lemma to 381 and 85
381 = 85 × 4 + 41
Again remainder 41 ≠ 0. So, we again apply the division lemma to 85 and 41.
85 = 41 × 2 + 3
Again remainder 3 ≠ 0. So, we again apply the division lemma to 4 1 and 3.
41 = 3 × 13 + 2
Again remainder 2 ≠ 0. So, we again apply the division lemma to 3 and 2.
3 = 2 × 1 + 1
Again remainder 1 ≠ 0. So, we apply division lemma to 2 and 1
2 = 1 × 2 + 0
The remainder now becomes O. So, our procedure stops.
Since the divisor at this stage is 1.
Hence, HCF of 847 and 2160 is 1 and numbers are co-prime.

Question 8.
Check whether 6ⁿ can end with the digit O for any natural number n.
Solution:
If the number 6ⁿ, for any n, were to end with the digit zero, then h would bc divisible by 5. That is, the prime factorisation of 6ⁿ would contain the prime 5. But 6ⁿ = (2 × 3)ⁿ = 2ⁿ × 3ⁿ So the primes in factorisation of 6ⁿ are 2 and 3. So the uniqueness of the Fundamental Theorem of Arithmetic guarantees that (here are no other primes except 2 and 3 in the factorisation of 6ⁿ. So there is no natural number n for which 6” ends with digit zero.

Real Numbers Class 10 Extra Questions HOTS

Question 1.
Show that there is iw positive integer n for which \(\sqrt{n-1}\) + \(\sqrt{n+1}\) is rational.
Solution:
Let there be a positive integer n for which \(\sqrt{n-1}\) + \(\sqrt{n+1}\) be rational number.

⇒ \(\sqrt{n-1}\) is also perfect. square of positive integer From (A) and (B)
\(\sqrt{n+1}\) and \(\sqrt{n-1}\) are perfect squares of positive integer. It contradict the fact that two perfect
squares differ at least by 3.
Hence, there is no positive integer n for which\(\sqrt{n-1}\) + \(\sqrt{n+1}\) is rational.

Question 2.
Let a, b, e, k be rational numbers such that k is not a perfect cube. if a + bk^1/2 + ck^2/3 then prove that a = b, c = 0.
Solution:


This is impossible as k^2/3 is irrational and \(\frac{a}{c}\) is rational.
∴ a³ – k²c³ ≠ 0
Hence, c = 0
Substituting c = 0 in b² – ac = 0, we get b = 0
Substituting b = 0 and c = 0 in a + bk^1/3 + ck^2/3= 0, we get a = 0
Hence, a = b = c = 0
Question 3.
Find the largest positive integer that will divide 398, 436 and 542 leaving remainders 7, 11 and 15 respectively.
Solution:
It is given that on dividing 398 by the required number, there is a remainder of 7. This means that 398 – 7 = 391 is exactly divisible by the required timber In other words, required number is a factor of 391.
Similarly, required positive integer is a Íctor of 436 – 11 = 425 and 542 – 15 = 527
Clearly, the required number is the HCF of 391, 425 and 527.
Using the factor tree, we get the prime factorisations of 391, 425 and 527 as follows:
391 = 17 × 23, 425 52 × 17 and 527 17 × 31
∴ HCF of 391, 425, and 527 is 17.
Hence, the required number = 17.

In this page, we are providing Matter in Our Surroundings Class 9 Extra Questions and Answers Science Chapter 1 pdf download. NCERT Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings with Answers will help to score more marks in your CBSE Board Exams. https://ncertmcq.com/extra-questions-for-class-9-science/

Class 9 Science Chapter 1 Extra Questions and Answers Matter in Our Surroundings

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings with Answers Solutions

Matter in Our Surroundings Class 9 Extra Questions Very Short Answer Type

Matter In Our Surroundings Class 9 Extra Questions With Answers Question 1.
Define the term ‘matter’.
Answer:
Matter is defined as anything that occupies some space and has definite mass.

Class 9 Science Chapter 1 Extra Questions And Answers Question 2.
What is Law of Conservation of Mass?
Answer:
Law of Conservation of Mass states that mass can neither be created nor destroyed in a chemical reaction.

Matter In Our Surroundings Extra Questions Class 9 Question 3.
Define melting point.
Answer:
It is the temperature at which a solid becomes liquid at atmospheric pressure by absorbing heat.

Class 9 Chemistry Chapter 1 Extra Questions Class 9 Question 4.
Out of water and alcohol, which is more volatile?
Answer:
The boiling point of alcohol (78°C or 351K) is lower than that of water (100°C or 373K), therefore, alcohol is more volatile than water.

Matter In Our Surroundings Class 9 Extra Questions With Answers Pdf Question 5.
What is sublimation?
Answer:
Direct conversion of a solid into vapour and vice-versa (i.e., vapour into solid) is called sublimation.

Matter In Our Surroundings Class 9 Extra Questions Question 6.
Is dry ice the same thing as ordinary ice?
Answer:
No, dry ice is solid carbon dioxide while ordinary ice is solid water.

Extra Questions For Class 9 Science Chapter 1 Question 7.
Define latent heat of fusion.
Answer:
It is the heat energy required to convert 1 kg of solid into liquid at its melting point at atmospheric pressure.

Class 9 Science Ch 1 Extra Questions  Question 8.
Define vapourisation.
Answer:
The process of change from liquid state to gaseous (vapour) state is called vapourisation.

Class 9 Chapter 1 Science Extra Questions Question 9.
Give the important properties on the basis of which the three states of matter can be distinguished.
Answer:
The three states of matter can distinguished on the basis of shape, volume, compressibility, packing of molecules, number of free surfaces, etc.

Ncert Class 9 Science Chapter 1 Extra Questions Question 10.
Name the term used for the solid which is directly formed from the gas.
Answer:
Sublimate.

Science Class 9 Chapter 1 Extra Questions Question 11.
Define the term volatile liquid.
Answer:
Those liquids which can change into vapour easily are termed as volatile liquids.

Ch 1 Science Class 9 Extra Questions Question 12.
What is the effect of pressure on boiling point?
Answer:
Boiling point increases with increase in pressure.

Class 9 Science Chapter 1 Extra Questions Question 13.
Name any two substances which sublime.
Answer:
Camphor, napthalene, iodine, ammonium chloride.

Class 9 Science Chapter 1 Short Question Answer Question 14.
Define condensation.
Answer:
The change of a gaseous state to a liquid state on cooling is known as condensation.

Chapter 1 Science Class 9 Extra Questions Question 15.
State the effect of surface area on rate of evaporation.
Answer:
If the surface area is increased, the rate of evaporation increases.

Question 16.
Define evaporation.
Answer:
Evaporation is a physical process in which a liquid changes to its gaseous state, at a temperature lower than its boiling point.

Question 17.
What are the ways in which a gas can be liquefied?
Answer:
Applying pressure and reducing temperature can liquefy gases.

Question 18.
What is plasma?
Answer:
It is a state of matter which consists of super energetic and super excited particles. These particles are in the form of ionised gases.

Question 19.
How do solids, liquids and gases differ in shape and volume?
Answer:
Solids have a definite shape and a fixed volume, liquids have a definite volume but no fixed shape while gases neither have a definite volume nor a definite shape.

Question 20.
Kelvin scale of temperature is regarded as better scale than Celsius. Why?
Answer:
As it has a wide range of measurement and temperature in kelvin scale always has a positive sign, hence regarded as better scale than Celsius.

Matter in Our Surroundings Class 9 Extra Questions Short Answer Type 1

Question 1.
What are characteristics of particles of matter?
Answer:
The particles of matter have following characteristics:

• Particles of matter are very very small.
• Particles of matter have space between them.
• Particles of matter attract each other.
• Particles of matter are constantly moving.

Question 2.
Write four main characteristics of solid state of matter.
Answer:

• Solids have definite mass, volume and shape.
• The particles in solid state are closely packed and empty spaces in them are negligible.
• Solids are rigid.
• Solids can have a number of free surfaces.

Question 3.
Write four main characteristics of liquid state of matter.
Answer:

• Liquids have a definite mass and volume.
• A liquid can take the shape of a container.
• Liquids have only one free surface.
• Liquids show the property of diffusion.

Question 4.
Write four characteristics of gaseous state of matter.
Answer:

• A gas has definite mass but it has neither definite shape nor definite volume.
• Gases can occupy the whole of the space available to them.
• There are larger vacant spaces between the molecules of a gas.
• Gases are highly compressible.

Question 5.
Explain evaporation and its cooling effect in terms of kinetic energy of particles.
Answer:
During evaporation, the molecules which possess higher kinetic energy leave the liquid and go into the space above the liquid as vapour. The remaining molecules possessing lower kinetic energy are left in the liquid state. Consequently, the average kinetic energy decreases which results in the fall of temperature of the liquid.

Question 6.
How is heat transferred when a solid sublimes?
Answer:
Certain solids like iodine, naphthalene, solid CO₂ sublimes on heating. Heat is absorbed by the molecules of these solids rapidly which provides enough kinetic energy to show phase change into gaseous state.

Question 7.
Why do gases diffuse rapidly?
Answer:
Gases diffuse rapidly due to high speed of the particles and large space between them.

Question 8.
For any substance, why does the temperature remain constant during the change of state?
Answer:
On increasing the temperature of a substance, for example a solid, the kinetic energy of the particles increases which is used to overcome the forces of attraction between the particles therefore the temperature remains constant during the change of state.

Question 9.
Explain compressibility in gases with an example.
Answer:
Liquefied petroleum gas (LPG) cylinders are used in our homes for cooking, contains gases in the compressed state. Similarly, compressed natural gas (CNG) is used as a fuel in vehicles. Large volume of gases can be compressed in small cylinders and are transported to distant places.

Question 10.
Why solids cannot be compressed like gases?
Answer:
The particles in solids are so tightly packed that there are no or little interparticle spaces left among them. Therefore solids are not compressible like gases. Gases which have large interparticle spaces are therefore compressible.

Question 11.
Define boiling. Why is boiling considered as bulk phenomenon?
Answer:
Rapid and breaking of bubbles in the bulk of a liquid being heated is called boiling. During boiling particles from the bulk of liquid gain enough energy to get converted to vapour. Therefore it is a bulk phenomenon.

Question 12.
Why do we see water droplets on the outer surface of a glass containing ice-cold water?
Answer:
The water vapour present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.

Question 13.
Why do we sprinkle water on the roof or open ground in summer?
Answer:
During hot summer evenings, we often sprinkle water on the roof of the house or open ground in front of our house. The water evaporates by absorbing heat from the ground and the surrounding air. By losing heat, the ground becomes cool and we feel comfortable.

Question 14.
Why is ice rubbed on a burnt part of the skin?
Answer:
When a finger or some part of our body gets burnt, we rub the burnt portion with an ice cube. The reason being that due to burning, the temperature of the injured skin increases. When ice is rubbed, the excess heat from the skin is taken away by large latent heat of fusion of water. As a result, the temperature of the injured skin decreases and we feel less pain.

Question 15.
How will you demonstrate that particles of matter are continuously moving?
Answer:
When an incense stick is lit in one corner of a room, we get the smell while sitting at a distance from the stick. This is because the particles of matter are continuously moving. Because of their random motion, the particles of incense mix with the particles of air rapidly and the smell of the incense reaches us even when we are sitting at a distance from the incense stick.

Question 16.
Why do solids expand a bit on heating and contract a bit on cooling?
Answer:
The solid molecules do not have sufficient intermolecular (or interparticle) space thus its expands a bit on heating. The interparticle forces of attraction are very strong which do not let solid particles leave their mean positions. Therefore solid contracts a bit on cooling.

Question 17.
Draw diagram to shown interconversion among states of matter.
Answer:

Question 18.
Why is light not considered matter?
Answer:
Matter occupies space and has mass. Light has neither of the two and that is why it is not considered as matter. It is considers as a form of energy and electromagnetic radiation.

Question 19.
Convert the following temperatures:
(a) – 78.0°C to kelvin
(b) 775 K to °C
(c) 489 K to °C
(d) 24°C to kelvin
Answer:
(a) – 78 + 273 = 195 K
(b) 775 – 273 = 502°C
(c) 489-273 = 216°C
(d) 24 + 273 = 297 K

Question 20.
Mention the difference between gas and vapour.
Answer:
Gas – The gas is a substance which exists in the gaseous state at a temperature equal to or more than the boiling point of its liquid state. For example oxygen, hydrogen, nitrogen, etc.

Vapour – A vapour is a substance which exists in the gaseous state such that its temperature is lower than that of boiling point of its liquid state. For example, water vapour, iodine vapour, etc.

Question 21.
A sample of water under study was found to boil at 102″C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.
Answer:
It’s freezing point will be below 0°C due to the presence of a non-volatile impurity in it.

Question 22.
Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations. [NCERT Exemplar]
Answer:
In case of ice, the water molecules have low energy while in the case of steam the water molecules have high energy. The high energy of water molecules in steam is transformed as heat and may cause burns. On the other hand, in case of ice, the water molecules take energy from the body and thus gave a cooling effect.

Question 23.
It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon clothes respectively. Who do you think would be more comfortable and why? [NCERT Exemplar]
Answer:
Cotton being a better absorber of water than nylon helps in absorption of sweat followed by evaporation which leads to cooling. So Priyanshi would be more comfortable than Ali.

Question 24.
You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster? [NCERT Exemplar]
Answer:
Conditions that can increase the rate of evaporation of water are:

• An increase of surface area by spreading the shirt
• An increase in temperature by putting the shirt under the Sun
• An increase the wind speed by spreading it under the fan.

Matter in Our Surroundings Class 9 Extra Questions Short Answer Type 2

Question 1.
What is evaporation? Why does evaporation cause cooling?
Answer:
The process in which a liquid changes into its vapour state at a temperature below the boiling point is called evaporation. Evaporation is an endothermic process i.e., the liquid absorbs heat during evaporation. This heat may be provided either by the surrounding or by the liquid itself. When the evaporating liquid takes the required heat from other parts of the liquid, the rest of the liquid cools down.

On the other hand, if the liquid takes heat from the surroundings, it causes cooling of the surroundings. For example, on a hot day (sunny day) we perspire. When this sweat evaporates, it absorbs the required heat from our body, and we feel cool.

Question 2.
What factors affect the rate of evaporation?
Answer:
Factors that affect the rate of evaporation are:

• Temperature: Evaporation increases with increase in temperature.
• Humidity: Evaporation decreases with an increase in humidity.
• Wind speed: Evaporation increases with an increase in wind speed.

Question 3.
What is a dry ice and what are its properties?
Answer:
Solid carbon dioxide is known as dry ice. It is stored under high pressure. Solid CO₂ gets converted directly to gaseous state on decrease of pressure to 1 atmosphere without passing through the liquid state (i.e., sublimes). This is the reason that solid carbon dioxide is also known as dry ice.

It is mainly used as a cooling agent because its temperature is very low than ice formed from water. Dry ice is commonly used in theaters and in movies to produce the effect of fog.

Question 4.
Why should we wear cotton clothes in summer?
Answer:
During summer, we perspire more because of the mechanism of our body which keeps us cool. We know that during evaporation, the particles at the surface of the liquid gain energy from the surroundings or body surface and change into vapour. The heat energy equal to latent heat of vapourisation is absorbed from the body leaving the body cool. Cotton, being a good absorber of water helps in absorbing the sweat and exposing it to the atmosphere for easy evaporation.

Question 5.
Give the main postulates of kinetic theory of matter.
Answer:
The main postulates of kinetic theory are:

• All matter is made up of a large number of extremely small particle called molecules.
• The molecules are always in a state of rapid random motion.
• The molecules possess kinetic energy.
• There are attractive forces between the molecules.
• The kinetic energy of molecules increases with increase in temperature.

Question 6.
Identify each of the following changes of state as evaporation, boiling or condensation. Give reason for your answer.
(a) Wet clothes dry when spread on wire.
(b) After a hot shower, your bathroom mirror is covered with water.
(c) Lava flows into the ocean and forms steam.
Answer:
(a) Evaporation, because conversion of liquid water to vapour occur at room temperature.
(b) Condensation, because hot water vapour condense to form liquid water.
(c) Boiling, because heat of lava makes liquid water boil and hence steam is formed.

Question 7.
Why do surgeons often spray some ether on the skin before performing minor surgery?
Answer:
Quite often doctors spray ether on a portion of skin the before performing minor surgery. The reason being that a ether has very low boiling point (308 K). Therefore, it evaporates quite rapidly. The heat energy needed for evaporation is taken from the skin. As a result, the temperature of the skin becomes so low that it almost becomes numb. Due to this numbness, the patient does not feel much pain when a minor cut is made in the skin in order to perform surgery.

Similarly, when a player gets injured during a game, ethyl chloride on the injured portion of the body. Since the boiling point of ethyl chloiide (285.5K or 12.5°C) is very low, it quickly evaporates. The heat energy needed for evaporation is taken from the skin. By losing heat, temperature of the skin becomes so low that it almost becomes numb. Due to this numbness, the player does not feel much pain.

Question 8.
Comment upon the following:
(i) Rigidity
(ii) Compressibility
(iii) Fluidity
Answer:
(i) Rigidity means tendency to maintain shape when some outside force is applied due to strong interparticle force.

(ii) Compressibility means tendency to decrease volume when some outside force is applied. Due to large interparticle distances in gases their volume decreases when some pressure is applied on them therefore, gases possess high compressibility.

(iii) Fluidity means tendency to flow. Due to large interparticle distances and weak forces of attraction gases have highest fluidity.

Question 9.
Comment on the following statements:
(а) Evaporation produces cooling.
(b) Rate of evaporation of an aqueous solution decreases with increase in humidity.
(c) Sponge though compressible is a solid. [NCERT Exemplar]
Answer:
(а) For evaporation to occur, heat energy is needed. This heat energy is taken out from the substance or the surroundings. As a result surrounding becomes cool. Thus, evaporation causes cooling.

(b) By humidity we mean, the amount of water vapours present in the air. With increase in humidity the rate of evaporation decreases. If the humidity of air is already high, it can hold only a little more amount of water vapour to reach that optimum level, therefore the rate of evaporation decreases.

(c) Sponge has large number of minute holes in which air is trapped. When we press it, air expelled and sponge is compressed to a small amount of matter which has a definite shape as well as definite volume.

Matter in Our Surroundings Class 9 Extra Questions Long Answer Type

Question 1.
List any five physical properties of liquids.
Answer:

• Liquids do not have fixed shape or boundaries.
• They have fixed volume.
• They exhibit fluidity i.e., they can flow.
• Less compressible as compared to gases but higher than solids.
• Lower density as compared to solids.
• Compared to solids, liquids have higher kinetic energy but less than gases.
• The intermolecular forces of attraction are weaker than those of solids.
• Show the property of intermixing i.e., can diffuse.

Question 2.
Fill in the blanks:
(а) Evaporation of a liquid at room temperature leads to a ………………… effect.
(b) At room temperature the forces of attraction between the particles of solid substances are ………………… than those which exist in the gaseous state.
(c) The arrangement of particles is less ordered in the state. However, there is no order in ………………… the state.
(d) is the change of gaseous state directly to solid state without going through the ………………… state.
(e) The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called ………………… [NCERT Exemplar]
Answer:
(a) cooling
(b) stronger
(c) liquid, gaseous
(d) Sublimation, liquid
(e) evaporation

Question 3.
Classify the following into osmosis/diffusion [NCERT Exemplar]
(a) Swelling up of a raisin on keeping in water.
(b) Spreading of virus on sneezing.
(c) Earthworm dying on coming in contact with common salt.
(d) Shrinking of grapes kept in thick sugar syrup.
(e) Preserving pickles in salt.
Answer:
(a) Osmosis
(b) Diffusion
(c) Osmosis
(d) Osmosis
(e) Osmosis

Question 4.
You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well labelled diagram. [NCERT Exemplar]
Answer:
Naphthalene is insoluble in water but soluble in ether an organic solvent. It is volatile at room temperature. Ammonium chloride is soluble in water and volatile at higher temperature. It decomposes on heating to dryness.

Question 5.
Why does the temperature of a substance remain constant during its melting point or boiling point?
Answer:
The temperature of a substance remains constant at its melting and boiling points untill all the substance melts or boils because, the heat supplied is continuously used up in changing the state of the substance by overcoming the forces of attraction between the particles. This heat energy absorbed without showing any rise in temperature is given the name latent heat of fusion/latent heat of vapourisation.

Matter in Our Surroundings Class 9 Extra Questions HOTS

Question 1.
Arrange the following substances in increasing order of force of attraction between the particles.
(a) Milk
(b) Salt
(c) Oxygen
Answer:
Oxygen < Milk < Salt.

Question 2.
Explain with an experiment to show gases do not have fixed shape or volume.
Answer:
Experiment: To show gases do not have fixed shape or volume.

Method:

• Take two balloons of different shapes. For example, one round and one heart shape or cylindrical.
• Fill the balloons with air.

Observation: Air takes up the shape of balloon.

Conclusion: This shows air has no definite shape or volume. It takes up the shape of the balloon.

Question 3.
Name the change of state during the following changes:
(a) Drying of wet clothes
(b) Melting of wax
(c) Melting of ice
(d) Formation of clouds
Answer:
(a) Liquid to gaseous state
(b) Solid to liquid state
(c) Solid to liquid state
(d) Liquid to gaseous state

Question 4.
With proper explanation, explain whether the following statements are true or false?
(a) Sublimation occurs only when the solid is heated.
(b) A lighter gas can move downwards and a heavier gas can move upwards.
(c) Interconversion of matter is a constant temperature process.
Answer:
(a) Statement is wrong. Sublimation may occur on its own or by heating, e.g., camphor, naphthalene, iodine, etc., sublime slowly at room temperature.

(b) Statement is true. Diffusion occurs against the law of gravitation. Therefore, lighter gases can also diffuse downwards and the heavier gases can also diffuse upwards. However rate of diffusion of lighter gases is faster than those of heavier gases.

(c) Statement is true. During interconversion of state of matter from solid to liquid or from liquid to gas, it tends to reach its melting point or boiling point. At this point, the temperature remains constant unit it has changed in another state.

Question 5.
What is meant by Bose-Einstein Condense?
Answer:
(a) In 1920, Indian scientist Satyendra Nath Bose did some calculations, based on which Albert Einstein predicted that a new state of matter should exist.

(b) This new state was named as Bose-Einstein Condensate (BEC). In 2001, Cornell, Ketterie and Wieman of USA received Noble Prize for actually making this state in laboratory. BEC is made by cooling gas of very low density to super low temperature.

Question 6.
A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following figure would correctly represent the result? Justify your choice. [NCERT Exemplar]

Answer:
Since ice and water are in equilibrium, the temperature would be zero. When we heat the mixture, energy supplied is utilised in melting the ice and the temperature does not change till all the ice melts because of latent heat of fusion. On further heating, the temperature of the water would increase. Therefore the correct option is (d).

Question 7.
Look at the figure and suggest in which of the vessels A, B, C or D the rate of evaporation will be the highest? Explain. [NCERT Exemplar]
Answer:

(c) The rate of evaporation increases with an increase in the surface area of absorption because evapo-ration in a surface phenomenon. Also, with the increase in air speed, the particles of water vapour will move away with the air, which will increase the rate of evaporation.

Matter in Our Surroundings Class 9 Extra Questions Value Based (VBQs)

Question 1.
In a hot summer day, Rajeev wants to watch a movie in a nearest cineplex. His mother wears a nylon saree so Rajeev suggest her to wear cotton saree.
(i) Why does Rajeev suggest her to wear cotton saree and not nylon saree?
(ii) Mention the values exhibited by Rajeev.
Answer:
(i) On a hot summer day, we sweat a lot. Cotton clothes absorb sweat from the body. As the sweat evaporates it results in cooling giving comfort to the body.

(ii) Caring, use of knowledge of science.

Question 2.
Mohan was getting late for school. He tried to sip tea from the cup. His father advised him to use a plate and asked him to sip the tea from the plate. Mohan followed the advice and finished his tea very easily.
(i) Why is siping off tea easier from a plate?
(ii) Mention the values exhibited by Mohan’s father.
Answer:
(i) A plate has a larger surface area than a cup. Evaporation becomes faster in this case. Since cooling is always caused during evaporation the temperature got lowered. Therefore it became easier to sip tea from a plate.

(ii) Caring, use of knowledge of science, helpful.

Get Chapter Wise MCQ Questions for Class 9 English with Answers of Beehive, Moments, English Language and Literature PDF Free Download prepared here according to the latest CBSE syllabus and NCERT curriculum https://ncert.nic.in/. Students can practice CBSE Class 9 English MCQs Multiple Choice Questions with Answers of Beehive, Moments to score good marks in the examination.

You can refer to NCERT Solutions for Class 9 English with Answers of Beehive, Moments, English Language and Literature to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Class 9 English MCQs Multiple Choice Questions with Answers Beehive, Moments

Practicing these CBSE NCERT Objective MCQ Questions of Class 9 English with Answers Pdf of Beehive, Moments, English Language and Literature will guide students to do a quick revision for all the concepts present in each chapter and prepare for final exams.

MCQ Questions for Class 9 English Language and Literature

MCQ Questions for Class 9 English with Answers Beehive

MCQ Questions for Class 9 English with Answers Beehive Prose

1. The Fun They Had Class 9 MCQ Questions
2. The Sound of Music Class 9 MCQ Questions
3. The Little Girl Class 9 MCQ Questions
4. A Truly Beautiful Mind Class 9 MCQ Questions
5. The Snake and the Mirror Class 9 MCQ Questions
6. My Childhood Class 9 MCQ Questions
7. Packing Class 9 MCQ Questions
8. Reach for the Top Class 9 MCQ Questions
9. The Bond of Love Class 9 MCQ Questions
10. Kathmandu Class 9 MCQ Questions
11. If I Were You Class 9 MCQ Questions

MCQ Questions for Class 9 English with Answers Beehive Poems

1. The Road Not Taken Class 9 MCQ Questions
2. Wind Class 9 MCQ Questions
3. Rain on the Roof Class 9 MCQ Questions
4. The Lake Isle of Innisfree Class 9 MCQ Questions
5. A Legend of the Northland Class 9 MCQ Questions
6. No Men are Foreign Class 9 MCQ Questions
7. The Duck and the Kangaroo Class 9 MCQ Questions
8. On Killing a Tree Class 9 MCQ Questions
9. The Snake Trying Class 9 MCQ Questions
10. A Slumber did my Spirit Seal Class 9 MCQ Questions

MCQ Questions for Class 9 English with Answers Moments

1. The Lost Child Class 9 MCQ Questions
2. The Adventures of Toto Class 9 MCQ Questions
3. Iswaran the Storyteller Class 9 MCQ Questions
4. In the Kingdom of Fools Class 9 MCQ Questions
5. The Happy Prince Class 9 MCQ Questions
6. Weathering the Storm in Ersama Class 9 MCQ Questions
7. The Last Leaf Class 9 MCQ Questions
8. A House is not a Home Class 9 MCQ Questions
9. The Accidental Tourist Class 9 MCQ Questions
10. The Beggar Class 9 MCQ Questions

We hope the given NCERT MCQ Questions for Class 9 English Language and Literature with Answers of Beehive, Moments PDF Free Download will help you. If you have any queries regarding CBSE Class 9 English MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to you soon.