Properties of Solids & Liquids-Heat Transfer (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 8 - 12 of 40

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Question number: 8

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

A solid copper sphere (density ρ and specific heat capacity c) of radius r at an initial temperature 200 K is suspends inside a chamber whose walls are at almost 0 K. The time required (in µ s) for the temperature of the sphere to drop to 100 K is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Passage

Read the passage given below and answer the questions that follows:

A brass ball of mass 100 gm is heated to 100°C and then dropped into 200 gm of turpentine in a calorimeter at 15°C. The final temperature is found to be 23°C. Take specific heat of brass as 0.092 cal/gm°C and water equivalent of calorimeter as 4 gm.

Question number: 9 (1 of 3 Based on Passage) Show Passage

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

Heat lost by the ball is approximately

Choices

Choice (4) Response

a.

710 cal

b.

810 cal

c.

610 cal

d.

510 cal

Question number: 10 (2 of 3 Based on Passage) Show Passage

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

The specific heat of turpentine is

Choices

Choice (4) Response

a.

0.72 cal/gm°c

b.

0.12 cal/gm°c

c.

0.42 cal/gm°c

d.

0.96 cal/gm°c

Question number: 11 (3 of 3 Based on Passage) Show Passage

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

Heat gained by turpentine and calorimeter is approximately

Choices

Choice (4) Response

a.

511 cal

b.

815 cal

c.

704 cal

d.

620 cal

Question number: 12

» Properties of Solids & Liquids » Heat Transfer » Convection

MCQ▾

Question

A composite metal bar of uniform section is made up of length 15 cm of copper, 10 cm of nickel and 5 cm of aluminum. Each part being in perfect thermal contact with the adjoining part. The copper end of the composite rod is maintained at 100°C and the aluminum end at 0°C. The whole rod is covered with belt so that there is no heat loss occurs at the sides. If K Cu = 2K al and K a1 = 3K Ni, then what will be the temperatures of Cu - Ni and Ni - Al junctions respectively,

Choices

Choice (4) Response

a.

30°C and 50°C

b.

50°C and 30°C

c.

23.33°C and 78.8°C

d.

83.33°C and 20°C

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