Heat Test

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Heat Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

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

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
1 / -0

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
1 / -0

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
1 / -0

Directions: 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.

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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A bimetallic strip is made of two metals joined to one another, where one metal expands more on heating than the other. Consider a bimetallic strip made of aluminium and steel (aluminium expands more on heating than steel). On heating, the strip will

A
remain straight

B
get twisted

C
bend with aluminium on the concave side

D
bend with steel on the concave side

Solution

Steel expands less on heating as compared to aluminium, so the bimetallic strip will bend with steel on concave side.
Question 8
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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 9
1 / -0

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 10
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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.
Question 11
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If half of a slab of ice is covered with a white cloth and the other half is covered with a black cloth, then which of the following will be observed?

A
No ice will melt under the white cloth.

B
No ice will melt under the black cloth.

C
More ice will melt under the white cloth than under the black cloth.

D
More ice will melt under the black cloth than under the white cloth.

Solution

Black cloth will absorb more heat as compared to the white cloth. So, more ice will melt under the black cloth than under the white cloth.
Question 12
1 / -0

Which of the following statements is false?

A
In conduction, the atoms of the medium do not leave their positions, but they transfer heat energy through their vibrations.

B
In solids and in mercury, heat is transferred mainly by the process of conduction.

C
Larger the concentration of free electrons in a metal, lesser is its conductivity.

D
Conduction is not possible in vacuum.

Solution

Larger the concentration of free electrons in a metal, larger is its conductivity.
Question 13
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Which of the statements given below are true?

(i) In non-metals, the process of heat transfer by means of conduction is slow.
(ii) In winters, we wear woollen clothes as they cause conduction of heat from the body to the surroundings.
(iii) Cooking utensils are made of metals, so that heat can easily be conducted through their base.
(iv) The liquid used in a thermometer must be a bad conductor of heat.

A
Only (i) and (ii)

B
Only (ii), (iii) and (iv)

C
Only (i), (iii) and (iv)

D
Only (i) and (iii)

Solution

In case of non metals, heat conductivity is less as compared to metals because electrons are not free to vibrate about their mean positions. Cooking utensils are made of metals, so that heat can easily be conducted through their base.
Question 14
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Metals are good conductors of heat because

A
their surfaces are good reflectors of heat

B
their atoms move very violently

C
they contain large number of free electrons

D
their surfaces are good absorbers of heat

Solution

Metals are good conductor of heat because they contain large number of free electrons and can vibrate about their mean positions. Thus, they can transfer their energy to the next electrons.
Question 15
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A thermos flask is designed to prevent the contents of the flask from losing heat. Which of the following statements concerning the design of thermos flasks is incorrect?

A
The vacuum between the glass walls prevents heat loss by preventing radiation.

B
The flask is designed to prevent heat loss by conduction, convection and radiation.

C
The stopper helps reduce heat loss by convection.

D
The glass walls are silver coated to reduce emitted radiation.

Solution

The inside of a thermos flask is coated silver because the silver forms a shiny covering on the inside of the flask. It reflects heat, thus preventing the gain or loss of heat by radiation.
Question 16
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Land and Sea breezes occur along coastal areas or areas with adjacent large water bodies. Water and land have different heating abilities. Water takes a bit more time to warm up and is able to retain the heat longer than land does. These breezes take place due to

A
convection

B
conduction

C
radiation

D
temperature

Solution

The motion of warm material that rises, cools off, and sinks again, producing a continuous circulation of material and transfer of heat is called convection. So, land breeze and sea breeze are caused by convection only.
Question 17
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Which of the following options correctly classifies the objects listed below as conductors and insulators?

(i) Aluminium wire
(ii) Steel spoon
(iii) Wooden handle
(iv) Silver coin
(v) Plastic bottle
(vi) Blade of knife

A

Conductors: (i), (ii), (vi)

Insulators: (iii), (iv), (v)

B

Conductors: (i), (ii)

Insulators: (iii), (iv), (v), (vi)

C

Conductors: (i), (ii), (iv), (vi)

Insulators: (iii), (v)

D

Conductors: (i), (ii), (iv)

Insulators: (iii), (v), (vi)

Solution

Aluminium wire, steel spoon, silver coin, blade of knife allow heat to pass through them. Therefore, these are conductors.
Wooden handle and plastic bottle do not allow heat to pass through them. So, these are insulators.
Question 18
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Which of the following statements is/are false?

a. Conduction starts once the two objects or the parts of the same object have attained the same temperature.
b. Cooling coils of air conditioners are made of copper as they readily conduct away heat.
c. Heat energy does flows through bad conductors, but at a very small rate as compared to good conductors.

A
Only a

B
Only a and b

C
Only b

D
Only b and c

Solution

Once the two objects or the parts of the same object have attained the same temperature, conduction stops.

Question 19

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Match the following:

a. Conduction	1. It is the process of transfer of heat in material bodies, due to the actual movement of the particles of the medium.
b. Convection	2. It is the process of transfer of heat in material bodies, without the actual movement of the particles of the medium.
c. Radiation	3. It is the process of transfer of heat from a hot body to a cold body, without the aid of any external medium.

a - 2, b - 3, c - 1

a - 2, b - 1, c - 3

a - 1, b - 2, c - 3

a - 1, b - 3, c - 2

Solution

Conduction is the process of transfer of heat in material bodies, without the actual movement of the particles of the medium.
Convection is the process of transfer of heat in material bodies, due to the actual movement of the particles of the medium.
Radiation is the process of transfer of heat from a hot body to a cold body, without the aid of any external medium.

Question 20
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The door of a running refrigerator inside a closed room was left open. Which of the following observations will be seen?

A
The room will be warmed up gradually.

B
The temperature of the room will remain unaffected.

C
The room will become as cold as the refrigerator.

D
The room will be cooled slightly.

Solution

Refrigerator is a device that transfers heat from inside a box to its surroundings.
If you leave the door open, heat is merely recycled from the room into the refrigerator, then back into the room. A net room temperature increase would result from the heat of the motor that would be constantly running to move energy around in a circle.

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Heat Test - 6

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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

remain straight

get twisted

bend with aluminium on the concave side

bend with steel on the concave side

Solution

Question 8

Only (ii)

Only (i) and (ii)

Only (ii) and (iii)

All of these

Solution

Question 9

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 10

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

Question 11

No ice will melt under the white cloth.

No ice will melt under the black cloth.

More ice will melt under the white cloth than under the black cloth.

More ice will melt under the black cloth than under the white cloth.

Solution

Question 12

In conduction, the atoms of the medium do not leave their positions, but they transfer heat energy through their vibrations.

In solids and in mercury, heat is transferred mainly by the process of conduction.

Larger the concentration of free electrons in a metal, lesser is its conductivity.

Conduction is not possible in vacuum.

Solution

Conductors: (i), (ii), (vi)

Insulators: (iii), (iv), (v)

Conductors: (i), (ii)

Insulators: (iii), (iv), (v), (vi)

Conductors: (i), (ii), (iv), (vi)

Insulators: (iii), (v)

Conductors: (i), (ii), (iv)

Insulators: (iii), (v), (vi)