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.

Subtopic:  Temperature and Heat |
From NCERT
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Which of the curves in the figure represents the relation between Celsius and Fahrenheit temperatures?

1. a
2. b
3. c
4. d

Subtopic:  Temperature and Heat |
64%
From NCERT
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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

Subtopic:  Temperature and Heat |
From NCERT
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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

Subtopic:  Thermal Expansion |
71%
From NCERT
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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

Subtopic:  Thermal Expansion |
83%
From NCERT
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Two identical rectangular strips, one of copper and the other of steel, are riveted together to form a bimetallic strip (αcopper > αsteel). On heating, this strip will:

 1 remain straight. 2 bend with copper on convex side. 3 bend with steel on convex side. 4 get twisted.

Subtopic:  Thermal Expansion |
78%
From NCERT
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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

Subtopic:  Thermal Expansion |
60%
From NCERT
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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

Subtopic:  Thermal Expansion |
53%
From NCERT
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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. $$6^{\circ} \mathrm{C}$$

Subtopic:  Thermal Expansion |
64%
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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.

Subtopic:  Thermal Expansion |
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