Students can access the CBSE Sample Papers for Class 11 Physics with Solutions and marking scheme Term 2 Set 3 will help students in understanding the difficulty level of the exam.

## CBSE Sample Papers for Class 11 Physics Standard Term 2 Set 3 for Practice

Time Allowed: 2 Hours
Maximum Marks: 40

General Instructions:

• There are 12 questions in all. All questions are compulsory.
• This question paper has three sections: Section A, Section B and Section C.
• Section A contains three questions of two marks each, Section B contains eight questions of three marks each, Section C contains one case study-based question of five marks.
• There is no overall choice. However, an internal choice has been provided in one question of two marks and two questions of three marks. You have to attempt only one of the choices in such questions.
• You may use log tables if necessary but use of calculator is not allowed.

Section – A (2 Marks Each)

Question 1.
Identical springs of steel and copper are equally stretched. On which, more work will have to be done?

Question 2.
How does the density of liquid vary with temperature ? Show that on increasing temperature by AT, density of liquid is given by
ρt = ρ(1 – γΔT)
where p is the initial density of the liquid and y is its coefficient of cubical expansion.
OR
Why is it impossible for a ship to use the internal energy of sea water to operate its engine ?

Question 3.
How does an atomiser work ?

Section – B (3 Marks Each)

Question 4.
State and prove Stefan-Boltzmann law. Question 5.
Define root mean square velocity of gas molecules. Give various relations for it.

Question 6.
A wire of length L and radius r is clamped rigidly at one end. When the other end of the wire is pulled by a force f, its length increases by l. Another wire of the same material of length 2L and radius 2r, is pulled by a force 2f. Find the increase in length of this wire.

Question 7.
The initial state of a certain gas is (f>,VirTt). It undergoes expansion till its volume becomes VyConsider the following two cases:
(a) the expansion takes place at constant temperature.
(b) the expansion takes place at constant pressure.
Plot the P-V diagram for each case. In which of the two cases, is the work done by the gas more?

Question 8.
What are beams ? Obtain the expression for its time period when supported at both ends.
OR
The frequency of oscillations of a mass m suspended by a spring is f1. If the length of the spring is cut to one-half, the same mass oscillates with frequency f2. Determine the value f2/f1. Question 9.
Consider a pair of identical pendulums, which oscillate with equal amplitude independently such that when one pendulum is at its extreme position making an angle of 2° to the right with the vertical, the other pendulum makes an angle of 1° to the left of the vertical. What is the phase difference between the pendulums?

Question 10.
What is column pressure ? Derive a relation for the same.

Question 11.
What is transverse wave motion ? Give examples.
OR
Given below are some examples of wave motion. State in each case, if the wave motion is transverse, longitudinal or a combination both.
(i) Motion of a kink in a long coil spring produced by displacing one end of the string sideways.
(ii) Waves produced in a cylinder containing a liquid by moving its piston back and forth.
(iii) Waves produced by a motor boat sailing in water.
(iv) Light waves travelling from sun to earth.
(v) Ultrasonic waves in air produced by a vibrating quartz crystal. Section – C (5 Marks)

Question 12.
Case Study: Longitudinal and transverse wave:
Longitudinal Waves are defined as waves those are capable of displacing the medium in a direction either in the direction of the waves or opposite. Longitudinal mechanical waves are known as compressional waves. This is because these mechanical waves produce a lot of compression and rarefaction while travelling through medium. These waves are also called as pressure waves as three is an increase and decrease in pressure while travelling.

Sound Waves like vibrations, P-Waves created through earthquakes, etc., are some kinds of longitudinal waves.

A transverse wave is defined as the wave that moves in the perpendicular direction of the vibration. One of the most important examples of transverse waves includes the waves created by the drum’s beating. The membrane of the drum moves perpendicular to the surface. Another example of a transverse wave is light. Transverse waves travels through crests and troughs.

Transverse waves are mostly present in solids those have profound elasticity. In some cases, when there is a deformation in the material, the wave is called a shear wave.
(i) Which wave is also known as shear wave?
(a) Longitudinal wave,
(b) Transverse wave
(c) Both (a) and (b)
(d) None of these 

(ii) Which wave is also known as compressional wave?
(a) Longitudinal wave
(b) Transverse wave
(c) Both (a) and (b)
(d) None of these