NCERT Class 11 Physics Chapter 11 Thermal Properties of Matter CBSE Board Sample Problems

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MCQ I

Question 1:

A bimetallic strip is made of aluminium and steel . On heating, the strip will

(a) Remain straight.

(b) Get twisted.

(c) Will bend with aluminium on concave side.

(d) Will bend with steel on concave side.

Answer: (d)

Question 2:

A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly

(a) Its speed of rotation increases.

(b) Its speed of rotation decreases.

(c) Its speed of rotation remains same.

(d) Its speed increases because its moment of inertia increases.

Answer: (b)

Question 3:

The graph between two temperature scales A and B is shown in Fig. 11.1. Between upper fixed point and lower fixed point there are 150 equal divisions on scale A and 100 on scale B. The relationship for conversion between the two scales is given by

Two temperature scales

Two Temperature Scales

Loading Image

(a)

(b)

(c)

(d)

Answer: (b)

Question 4:

An aluminium sphere is dipped into water. Which of the following is true?

(a) Buoyancy will be less in water at than that in water at .

(b) Buoyancy will be more in water at than that in water at .

(c) Buoyancy in water at will be same as that in water at .

(d) Buoyancy may be more or less in water at depending on the radius of the sphere.

Answer: (a)

Question 5:

As the temperature is increased, the time period of a pendulum

(a) Increases as its effective length increases even though its centre of mass still remains at the centre of the bob.

(b) Decreases as its effective length increases even though its centre of mass still remains at the centre of the bob.

(c) Increases as its effective length increases due to shifting of centre of mass below the centre of the bob.

(d) Decreases as its effective length remains same but the centre of mass shifts above the centre of the bob.

Answer: (a)

Question 6:

Heat is associated with

(a) Kinetic energy of random motion of molecules.

(b) Kinetic energy of orderly motion of molecules.

(c) Total kinetic energy of random and orderly motion of molecules.

(d) Kinetic energy of random motion in some cases and kinetic energy of orderly motion in other.

Answer: (a)

Question 7:

The radius of a metal sphere at room temperature T is R, and the coefficient of linear expansion of the metal is . The sphere is heated a little by a temperature ΔT so that its new temperature is . The increase in the volume of the sphere is approximately

(a)

(b)

(c)

(d)

Answer: (d)

Original volume

Coeff of linear expansion

Coeff of volume expansion

Question 8:

A sphere, a cube and a thin circular plate, all of same material and same mass are initially heated to same high temperature.

(a) Plate will cool fastest and cube the slowest

(b) Sphere will cool fastest and cube the slowest

(c) Plate will cool fastest and sphere the slowest

(d) Cube will cool fastest and plate the slowest.

Answer: (c)