Consider the following statements.

A metal sheet with a circular hole is heated. The hole is:

Two identical rectangular strips, one of copper and the other of steel, are riveted together to form a bimetallic strip \((α_\text{copper} > α_\text{steel}).\) On heating, this strip will:

If the temperature of a uniform rod is slightly increased by Δt, its moment of inertia I about a perpendicular bisector increases by

1.  zero

2.  αIΔt

3.  2 αIΔt

4.  3 αIΔt

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 \(2^{\circ} ~\text{C}.\) 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 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