Heat Test

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Heat Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

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 2
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 3
1 / -0

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 4
1 / -0

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 5
1 / -0

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 6
1 / -0

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 7

1 / -0

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 8
1 / -0

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 - 2

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Heat Test - 2

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Question 1

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 2

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

Question 3

Only (i) and (ii)

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

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

Only (i) and (iii)

Solution

Question 4

their surfaces are good reflectors of heat

their atoms move very violently

they contain large number of free electrons

their surfaces are good absorbers of heat

Solution

Question 5

convection

conduction

radiation

temperature

Solution

Question 6

Only a

Only a and b

Only b

Only b and c

Solution

Question 7

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

Question 8

The room will be warmed up gradually.

The temperature of the room will remain unaffected.

The room will become as cold as the refrigerator.

The room will be cooled slightly.

Solution

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