Heat Test

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Heat Test - 1

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Question 1
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Directions For Questions

Read the given information carefully and answer the question that follows.

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Three containers contain different quantities of water.
Container A contains 5 kg of water at 45°C.
Container B contains 3 kg of water at 45°C.
Container C contains 10 kg of water at 45°C.

If we place all three containers in contact with each other, then which of the following is correct?

A
Heat will flow from A to B to C.

B
Heat will flow from B to C to A.

C
Heat will flow from C to A to B.

D
No heat flow will occur.

Solution

As all the containers are at the same temperature, no heat flow will occur.
Question 2
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If we mix 10 kg of water at 70°C with 10 kg of water at 20°C, then the temperature of the mixture will be

A
equal to 70°C

B
equal to 20°C

C
between 20°C and 70°C

D
Cannot be determined

Solution

The water at 20°C will warm up (heat energy flows into it). The water at 70°C will cool down (heat energy flows out of it). The resultant will be somewhere between these two temperatures.
Question 3
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What is the value of zero degree Kelvin on a Celsius scale?

A
- 273°C

B
- 32°C

C
- 0°C

D
100°C

Solution

Relation between the Kelvin and Celsius scale is
K = 273 + °C
Hence, at 0 K, temperature in Celsius scale will be - 273°C.
Question 4
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Which of the following thermometers can be used to measure the temperature of boiling water?

A
Clinical thermometer

B
Laboratory thermometer

C
Maximum-minimum thermometer

D
Both (1) and (2)

Solution

In clinical thermometer, the scale runs from 35°C to 42°C.

A laboratory thermometer cannot be used to measure temperatures lower than -39˚C (as mercury freezes at that point) or temperatures higher than 356.7˚C (the boiling point of mercury).

A maximum and minimum thermometer is used for measuring the day's maximum and minimum temperature.
Question 5
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Every temperature measuring instrument makes use of a physical property of a substance in order to measure temperature objectively. Which of the following physical properties is used by a mercury-in-glass thermometer?

A
Electromotive force

B
Volume of a fixed mass of liquid

C
Resistance of a piece of metal

D
Pressure of a fixed mass of gas at constant volume

Solution

The mercury-in-glass or mercury thermometer consists of a bulb containing mercury that is attached to a glass tube of narrow diameter. The volume of mercury in the tube is much less than the volume of the bulb. The volume of mercury changes as the temperature changes and the mercury column rises through the narrow bore.

Hence, the volume of mercury changes, but the mass remains constant.
Question 6
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Directions For Questions

Read the given information carefully and choose the correct answer.

Rahul takes two thermometers, A and B. He wraps a black cloth on the bulb of thermometer A and a white cloth on that of thermometer B. He keeps the two thermometers in the Sun for an hour.

...view full instructions

Statement A: The reading on the thermometer A is more than that on the thermometer B.

Statement B: The black surface absorbs more heat than the white surface.

A
Both statements A and B are correct and B is the correct explanation of A.

B
Both statements A and B are correct, but B is not the correct explanation of A.

C
Statement A is incorrect, but statement B is correct.

D
Both statements A and B are incorrect.

Solution

Both statements A and B are correct and B is the correct explanation of A. The black cloth absorbs more heat and the temperature of the black cloth rises more than the white cloth.
Question 7
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Which of the following is/are the result(s) of transfer of heat by radiation?

(i) If we sit near a fire, we feel warm.
(ii) It is cooler in the shade, while it is hot in the Sun.
(iii) In a toaster, slices of bread get heated from the heat of the coil.

A
Only (ii)

B
Only (i) and (ii)

C
Only (ii) and (iii)

D
All of these

Solution

In all the given examples, heat is transferred from the source to the destination by radiation.
Question 8
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Which of the following statements is incorrect?

A
A good conductor loses heat faster.

B
A material of high conductivity can absorb large amounts of heat.

C
The coefficient of thermal conductivity cannot determine the direction of propagation of heat.

D
Free electrons transport heat from higher temperature to lower temperature.

Solution

Specific heat determines the amount of heat which can be absorbed by the material.
Question 9
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Which of the following statements is true?

A
The thermal conductivity of gases is zero.

B
Fur coats keep us warm by absorbing heat from outside.

C
If we double the length of a rod, its thermal conductivity is halved.

D
Solids cannot transmit heat by convection.

Solution

In case of solids, the molecules are tightly bound. Hence, they are not free to move. So, solids cannot transmit heat by convection.

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Heat Test - 1

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Question 1

Heat will flow from A to B to C.

Heat will flow from B to C to A.

Heat will flow from C to A to B.

No heat flow will occur.

Solution

Question 2

equal to 70°C

equal to 20°C

between 20°C and 70°C

Cannot be determined

Solution

Question 3

- 273°C

- 32°C

- 0°C

100°C

Solution

Question 4

Clinical thermometer

Laboratory thermometer

Maximum-minimum thermometer

Both (1) and (2)

Solution

Question 5

Electromotive force

Volume of a fixed mass of liquid

Resistance of a piece of metal

Pressure of a fixed mass of gas at constant volume

Solution

Question 6

Both statements A and B are correct and B is the correct explanation of A.

Both statements A and B are correct, but B is not the correct explanation of A.

Statement A is incorrect, but statement B is correct.

Both statements A and B are incorrect.

Solution

Question 7

Only (ii)

Only (i) and (ii)

Only (ii) and (iii)

All of these

Solution

Question 8

A good conductor loses heat faster.

A material of high conductivity can absorb large amounts of heat.

The coefficient of thermal conductivity cannot determine the direction of propagation of heat.

Free electrons transport heat from higher temperature to lower temperature.

Solution

Question 9

The thermal conductivity of gases is zero.

Fur coats keep us warm by absorbing heat from outside.

If we double the length of a rod, its thermal conductivity is halved.

Solids cannot transmit heat by convection.

Solution

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