Check the below NCERT MCQ Questions for Class 10 Maths Chapter 8 Introduction to Trigonometry with Answers Pdf free download. MCQ Questions for Class 10 Maths with Answers were prepared based on the latest exam pattern. We have provided Introduction to Trigonometry Class 10 Maths MCQs Questions with Answers to help students understand the concept very well.

Students can also refer to NCERT Solutions for Class 10 Maths Chapter 8 Introduction to Trigonometry for better exam preparation and score more marks.

## Introduction to Trigonometry Class 10 MCQs Questions with Answers

Question 1.
Given that sin θ = $$\frac{a}{b}$$ then cos θ is equal to
(a) $$\frac{b}{\sqrt{b^2-a^2}}$$
(b) $$\frac{b}{a}$$
(c) $$\frac{\sqrt{b^2-a^2}}{b}$$
(d) $$\frac{a}{\sqrt{b^2-a^2}}$$

Answer: (c) $$\frac{\sqrt{b^2-a^2}}{b}$$

Question 2.
Given that sin α = $$\frac{1}{2}$$ and cos β = $$\frac{1}{2}$$, then the value of (α + β) is
(a) 0°
(b) 30°
(c) 60°
(d) 90°

Question 3.
If tan θ = 3, then $$\frac{4sin θ-cos θ }{4sin θ+cos θ}$$ is equal to
(a) $$\frac{2}{3}$$
(b) $$\frac{1}{3}$$
(c) $$\frac{1}{2}$$
(d) $$\frac{3}{4}$$

Answer: (c) $$\frac{1}{2}$$

Question 4.
sin (45° + θ) – cos (45° – θ) is equal to
(a) 2 cos θ
(b) 0
(c) 2 sin θ
(d) 1

Question 5.
If √2 sin (60° – α) = 1 then α is
(a) 45°
(b) 15°
(c) 60°
(d) 30°

Question 6.
The value of sin² 30° – cos² 30° is
(a) –$$\frac{1}{2}$$
(b) $$\frac{√3}{2}$$
(c) $$\frac{3}{2}$$
(d) –$$\frac{2}{3}$$

Answer: (a) –$$\frac{1}{2}$$

Question 7.
The maximum value of $$\frac{1}{cosec α}$$ is
(a) 0
(b) 1
(c) $$\frac{√3}{2}$$
(d) –$$\frac{1}{√2}$$

Question 8.
If cos (40° + A) = sin 30°, then value of A is
(a) 30°
(b) 40°
(c) 60°
(d) 20°

Question 9.
If cosec θ – cot θ = $$\frac{1}{3}$$, the value of (cosec θ + cot θ) is
(a) 1
(b) 2
(c) 3
(d) 4

Question 10.
In the given figure, if AB = 14 cm, BD = 10 cm and DC = 8 cm, then the value of tan B is (a) $$\frac{4}{3}$$
(b) $$\frac{14}{3}$$
(c) $$\frac{5}{3}$$
(d) $$\frac{13}{3}$$

Answer: (a) $$\frac{4}{3}$$

Question 11.
$$\frac{1+tan^2 A}{1+cot^2 A}$$ is equal to
(a) sec² A
(b) -1
(c) cot² A
(d) tan² A

Question 12.
If cos A + cos² A = 1, then sin² A + sin4 A is equal to
(a) -1
(b) 0
(c) 1
(d) None of these

Question 13.
If sin θ + sin² θ = 1 then cos² θ + cos4 θ is equal
(a) -1
(b) 1
(c) 0
(d) None of these

Question 14.
2(sin6 θ + cos6 θ) – 3(sin4 θ + cos4 θ) is equal to
(a) 0
(b) 6
(c) -1
(d) None of these

Question 15.
If cos (81 + θ)° = sin($$\frac{k}{3}$$ – θ)° where θ is an acute angle, then the value of k is
(a) 18°
(b) 27°
(c) 9°
(d) 81°

Question 16.
3 sin² 20° – 2 tan² 45° + 3 sin² 70° is equal to
(a) 0
(b) 1
(c) 2
(d) -1

Question 17.
If sin 2A = $$\frac{1}{2}$$ tan² 45° where A is an acute angle, then the value of A is
(a) 60°
(b) 45°
(c) 30°
(d) 15°

Question 18.
$$\frac{sin θ}{1 + cos θ}$$ is
(a) $$\frac{cos θ}{1 – sin θ}$$
(b) $$\frac{1 – sin θ}{sin θ}$$
(c) $$\frac{1 – sin θ}{cos θ}$$
(d) $$\frac{1 – cos θ}{sin θ}$$

Answer: (d) $$\frac{1 – cos θ}{sin θ}$$

Question 19.
If x sin (90° – θ) cot (90° – θ) = cos (90° – θ), then x is equal to
(a) 0
(b) 1
(c) -1
(d) 2

Question 20.
If A + B = 90°, cot B = $$\frac{3}{4}$$ then tan A is equal to:
(a) $$\frac{5}{3}$$
(b) $$\frac{1}{3}$$
(c) $$\frac{3}{4}$$
(d) $$\frac{1}{4}$$

Answer: (c) $$\frac{3}{4}$$