Heat Test

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Heat Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

At low temperatures ................. type of thermometer is used.

A
mercury thermometer

B
water thermometer

C
alcohol thermometer

D
thermometers cannot be used
Solution
Alcohol thermometer.

Reason:
Alcohol expands uniformly.
It has a low freezing point ($$-115^oC$$) therefore it is very suitable for the place where the temperature gets very low.
It is an easily available cheap liquid, which is safe to use.
Alcohol is cheaper than mercury, and if you break the thermometer, it is not toxic.
Question 2
1 / -0

Suppose a liquid in a container is heated at the top rather than at the bottom. What is the main process by which the rest of the liquid becomes hot ?

A
Conduction

B
Evaporation

C
Sublimation

D
None of these

Solution

Answer is A
Since liquid is heated from top,so top will become warm and light .It will remain on the top of container as its density decreases ,so no mixing will take place.Hence conduction is only source of heat exchange.
Question 3
1 / -0

The rise in temperature of a substance depends on

A
the quantity of heat supplied

B
the mass of the substance

C
the nature of the substance

D
all the above

Solution

The rise in temperature of a substance depends upon the quantity of heat supplied, nature and mass of the substance.
Question 4
1 / -0

A red hot brick is placed on an iron tripod stand which stands on a large block of copper. The brick loses heat by:

A
conduction

B
conduction and radiation

C
conduction and convection

D
conduction, convection, and radiation

Solution

The bricks losses heat by conduction through iron tripod stand to the copper block which is then radiated away and convection currents are set up in the surrounding air and by radiation.
Question 5
1 / -0

When you heat a bowl of water, we can observe that water starts circulating. This demonstrates:

A
conduction

B
convection

C
radiation

D
none

Solution

When you heat a bowl of water, we can observe that the water starts circulating. This is nothing but convection. As when water is heated, the water molecules above the surface of bowl is heated first; temperature increases and density decreases; and due to decrease in density; that water molecules goes up and water molecules present at brim goes down because of relatively more density. Due to this water circulates, this is convection.
Question 6
1 / -0

In the diagram shown, will the convection current be clockwise or anticlockwise on the left part of the figure?

A
Anticlockwise

B
Clockwise

C
Will keep on changing

D
Can't be said
Question 7
1 / -0

The water in an open pond remains cool even in hot summer because

A
of continuous evaporation of water

B
water radiates heat more rapidly than the atmosphere

C
water being bad conductor absorbs heat less rapidly than the atmosphere

D
None of these

Solution
Question 8
1 / -0

Conduction is:

A
the process of transfer of heat which does not require any material medium

B
the process of transferring heat from molecule to molecule, without any movement of molecules

C
the process in which molecules conduct heat by moving from hotter regions to colder regions

D
the process in which heat energy moves through the medium of protons

Solution

$$\textbf{Correct option: Option (B).}$$

$$\textbf{Explanation:}$$

$$\bullet$$Conduction is one of the modes of transfer of heat. It generally takes place in solids.

$$\bullet$$Through this method heat is transferred from one part of the body to another through the vibratory motion of the molecule. No actual movement of molecules takes place in this method.

$$\textbf{Thus, conduction is the process of transfer of heat from molecule to molecule, without the}$$
$$\textbf{actual movement of molecules. Hence, option (B) is correct.}$$
Question 9
1 / -0

It is hotter over the top of fire than at the same distance on the sides because of:

A
Convection of heat

B
Conduction of heat

C
Radiation of heat

D
All of the above

Solution

Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises, and hence at the top of the fire, this warm air is felt much compared to the sides.
Question 10
1 / -0

Mud houses are cooler in summer and warmer in winter because

A
mud is a good conductor of heat

B
mud is a superconductor of heat

C
mud is a bad conductor of heat

D
none of these

Solution

Mud is a bad conductor of heat. It does not allow the heat to transfer from house to atmosphere in winter and atmosphere to house in summer.

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Re-Attempt Weekly Quiz Competition

Heat Test - 27

Result

Heat Test - 27

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SHARING IS CARING

Question 1

mercury thermometer

water thermometer

alcohol thermometer

thermometers cannot be used

Solution

Question 2

Conduction

Evaporation

Sublimation

None of these

Solution

Question 3

the quantity of heat supplied

the mass of the substance

the nature of the substance

all the above

Solution

Question 4

conduction

conduction and radiation

conduction and convection

conduction, convection, and radiation

Solution

Question 5

conduction

convection

radiation

none

Solution

Question 6

Anticlockwise

Clockwise

Will keep on changing

Can't be said

Question 7

of continuous evaporation of water

water radiates heat more rapidly than the atmosphere

water being bad conductor absorbs heat less rapidly than the atmosphere

None of these

Solution

Question 8

the process of transfer of heat which does not require any material medium

the process of transferring heat from molecule to molecule, without any movement of molecules

the process in which molecules conduct heat by moving from hotter regions to colder regions

the process in which heat energy moves through the medium of protons

Solution

Question 9

Convection of heat

Conduction of heat

Radiation of heat

All of the above

Solution

Question 10

mud is a good conductor of heat

mud is a superconductor of heat

mud is a bad conductor of heat

none of these

Solution

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