NEET MCQs: Heat, temperature, expansion, specific heat, calorimetry and latent heat

Question 1

Taking the specific heat of water as 4.2 J g⁻¹ °C⁻¹, the heat needed to raise the temperature of 300 g of water by 40 °C is:

Accepted Answer

50400 J

Answer

50.4 J

Answer

1260 J

Answer

12000 J

Question 2

A pendulum clock keeps correct time at 20 °C. The linear expansion coefficient of the pendulum's metal rod is 2 × 10⁻⁵ °C⁻¹. How much time will the clock lose per day if the temperature increases to 40 °C?

Accepted Answer

17.28 s

Answer

8.64 s

Answer

34.56 s

Answer

4.32 s

Question 3

A piece of ice at 0 °C falls from a height h such that upon hitting the ground, all of its mechanical energy is converted into heat within the ice. What is the minimum height from which it must fall so that it melts completely? (Latent heat of fusion of ice L = 3.36 × 10⁵ J kg⁻¹, g = 9.8 m s⁻²)

Accepted Answer

34.3 km

Answer

3.43 km

Answer

17.1 km

Answer

68.6 km

Question 4

A block of ice of mass 100 g at 0 °C is dropped into a copper calorimeter containing 100 g of water at 20 °C. The water equivalent of the calorimeter is 10 g. Assuming no heat is lost to the surroundings, how much ice remains unmelted at thermal equilibrium? (Latent heat of fusion of ice = 80 cal g⁻¹, specific heat of water = 1 cal g⁻¹ °C⁻¹)

Accepted Answer

72.5 g

Answer

27.5 g

Answer

50.0 g

Answer

80.0 g

Question 5

Two identical containers contain equal masses of two different liquids, A and B. Both are supplied heat at the same constant rate. The graph of temperature versus time shows that the slope for liquid A is twice the slope for liquid B. Neglecting heat capacities of the containers, the ratio of the specific heat capacity of A to that of B (s_A / s_B) is:

Accepted Answer

1/2

Answer

2

Answer

1/4

Answer

4

Question 6

A circular ring of wire of radius R and cross-sectional area A has a coefficient of linear expansion α and Young's modulus Y. If the temperature of the ring is raised by ΔT, what is the tension developed in the ring if it is prevented from expanding radially by a rigid, non-conducting circular core?

Accepted Answer

Y A α ΔT

Answer

Y A α ΔT / 2

Answer

2π Y A α ΔT

Answer

Zero

Question 7

Taking the specific heat of water as 4.2 J g⁻¹ °C⁻¹, the heat needed to raise the temperature of 350 g of water by 50 °C is:

Accepted Answer

73500 J

Answer

1470 J

Answer

73.5 J

Answer

17500 J

Question 8

Taking the specific heat of water as 4.2 J g⁻¹ °C⁻¹, the heat needed to raise the temperature of 350 g of water by 40 °C is:

Accepted Answer

58800 J

Answer

58.8 J

Answer

14000 J

Answer

1470 J

Question 9

Taking the specific heat of water as 4.2 J g⁻¹ °C⁻¹, the heat needed to raise the temperature of 400 g of water by 35 °C is:

Accepted Answer

58800 J

Answer

58.8 J

Answer

1680 J

Answer

14000 J

Question 10

A platinum resistance thermometer has a resistance of 5.00 Ω at 0 °C and 5.93 Ω at 100 °C. When the thermometer is inserted into a hot bath, its resistance is measured to be 5.70 Ω. Assuming the resistance varies linearly with temperature, the temperature of the bath is:

Accepted Answer

75.3 °C

Answer

81.2 °C

Answer

68.5 °C

Answer

70.0 °C

Question 11

A composite rod is made by joining two rods of different materials end to end. The rods have lengths L₁ and L₂ and linear thermal expansion coefficients α₁ and α₂ respectively. The effective coefficient of linear expansion of the composite rod is:

Accepted Answer

(L₁α₁ + L₂α₂) / (L₁ + L₂)

Answer

(L₁α₂ + L₂α₁) / (L₁ + L₂)

Answer

(α₁ + α₂) / 2

Answer

√(α₁α₂)

Question 12

If the temperature of a uniform solid sphere is increased by ΔT, the fractional change in its moment of inertia about its diameter is: (Take α as the coefficient of linear expansion of the material)

Accepted Answer

2α ΔT

Answer

α ΔT

Answer

3α ΔT

Answer

5α ΔT

Heat, temperature, expansion, specific heat, calorimetry and latent heat: NEET MCQs with answers

1. Taking the specific heat of water as 4.2 J g⁻¹ °C⁻¹, the heat needed to raise the temperature of 300 g of water by 40 °C is:

2. A pendulum clock keeps correct time at 20 °C. The linear expansion coefficient of the pendulum's metal rod is 2 × 10⁻⁵ °C⁻¹. How much time will the clock lose per day if the temperature increases to 40 °C?

7. Taking the specific heat of water as 4.2 J g⁻¹ °C⁻¹, the heat needed to raise the temperature of 350 g of water by 50 °C is:

8. Taking the specific heat of water as 4.2 J g⁻¹ °C⁻¹, the heat needed to raise the temperature of 350 g of water by 40 °C is:

9. Taking the specific heat of water as 4.2 J g⁻¹ °C⁻¹, the heat needed to raise the temperature of 400 g of water by 35 °C is:

10. A platinum resistance thermometer has a resistance of 5.00 Ω at 0 °C and 5.93 Ω at 100 °C. When the thermometer is inserted into a hot bath, its resistance is measured to be 5.70 Ω. Assuming the resistance varies linearly with temperature, the temperature of the bath is:

11. A composite rod is made by joining two rods of different materials end to end. The rods have lengths L₁ and L₂ and linear thermal expansion coefficients α₁ and α₂ respectively. The effective coefficient of linear expansion of the composite rod is:

12. If the temperature of a uniform solid sphere is increased by ΔT, the fractional change in its moment of inertia about its diameter is: (Take α as the coefficient of linear expansion of the material)

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