If the temperature of a uniform rod is slightly increased by Δt, its moment of inertia I about a line parallel to itself will increase by

1.  zero

2.  αIΔt

3.  2 αIΔt

4.  3 αIΔt

The temperature of water at the surface of a deep lake is \(2^{\circ} \mathrm{C}\). The temperature expected at the bottom is:
1. \(0^{\circ} \mathrm{C}\)
2. \(2^{\circ} \mathrm{C}\)
3. \(4^{\circ} \mathrm{C}\)
4. \(6^{\circ} \mathrm{C}\)

An aluminium sphere is dipped into water at 10°C. If the temperature is increased, the force of buoyancy

1.  will increase

2.  will decrease

3.  will remain constant

4.  may increase or decrease depending on the radius of the sphere.

A spinning wheel is brought in contact with an identical wheel spinning at identical speed. The wheels slow down under the action of friction. Which of the following energies of the first wheel decrease?

A spinning wheel A is brought in contact with another wheel B initially at rest. Because of the friction at contact, the second wheel also starts spinning. Which of the following energies of the wheel B increase?

A body A is placed on a railway platform and an identical body B in a moving train. Which of the following energies of B are greater than those of A as seen from the ground ?

In which of the following pairs of temperature scales, the size of a degree is identical ?

(a) mercury scale and ideal gas scale

(b) Celsius scale and mercury scale

(c) Celsius scale and ideal gas scale

(d) ideal gas scale and absolute scale.

Choose the correct option 

1.  (a) , (b) 

2. (a) , (c)

3. (c) , (d) 

4. (a) , (d)

A solid object is placed in water contained in an adiabatic container for some time. The temperature of water falls during the period and there is no appreciable change in the shape of the object. The temperature of the solid object.

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

Choose the correct option 

There is some liquid in a closed bottle. The amount of liquid is continuously decreasing. The vapour in the remaining part

1.  must be saturated

2.  must be unsaturated

3.  may be saturated

4.  there will be no vapour.