A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z

1.  must be in thermal equilibrium

2.  cannot be in thermal equilibrium

3.  maybe in thermal equilibrium.

Which of the curves in the figure represents the relation between Celsius and Fahrenheit temperatures?

1. a 
2. b
3. c
4. d

Which of the following pairs may give equal numerical values of the temperature of a body?

1. Fahrenheit and kelvin

2. Celsius and kelvin

3. Kelvin and platinum

4. None of these

Consider the following statements.

A metal sheet with a circular hole is heated. The hole:
1. gets larger
2. gets smaller
3. remains of the same size
4. gets deformed

Two identical rectangular strips, one of copper and the other of steel, are riveted together to form a bimetallic strip (α_copper > α_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 \(2^{\circ} \mathrm{C}\). 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.