Consider the following statements.

A.	The coefficient of linear expansion has dimension K–1
B.	The coefficient of volume expansion has dimension K–1

 

1.	A and B are both correct.
2.	A is correct but B is wrong.
3.	A is wrong but B is correct
4.	Both are wrong

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 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 ?