Heat Test

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Heat Test - 24

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Weekly Quiz Competition

Question 1
1 / -0

Why do we wear cotton clothes in Summer ?

A
Cotton is a bad conductor of heat and doesn't allow passage of warmer air near body.

B
Cotton is a good conductor of heat and allows body heat to escape in the atmosphere.

C
Cotton absorbs sweat from the body, exposing it to atmosphere for easy evaporation

D
None of the above

Solution

We wear cotton clothes during summer as cotton absorbs sweat from the body, exposing to the atmosphere for easy evaporation. As we tend to sweat more during summer and cotton fabric absorbs sweat and help body to cool down. Cotton allows better air circulation which helps to absorb and removing body moisture caused by sweat via evaporation.
Question 2
1 / -0

Which of the following is the wrong pair of clothes worn during a particular season?

A
Cotton clothes during summer

B
Woolen clothes during winter

C
Dark colored clothes during summer

D
Polyester raincoats during Rainy season

Solution

Dark-colored clothes during summer are the wrong pair of clothes. During summer, the heat present in the atmosphere and surroundings is too much. And when dark-colored clothes are the worm, as we know dark color absorbs more heat than any other color. So it will increase the heat felt by our body during summer.
Question 3
1 / -0

Which of the following is a reason for using woolen clothes in Winter ?

A
Wool is an insulator of heat.

B
It traps a layer of air in its fabric.

C
Air being an insulator doesn't allow body heat to escape into the atmosphere.

D
All the above

Solution

Reason behind using woolen clothes during winter is that wool is a bad conductor of heat, it insulates the body from the surrounding.

Also, Woolen clothes have fine pores filled with air such that it is trapped between our body and the clothes. And the air which is trapped between woolen fabrics, prevents the flow of heat from the body as air is a bad conductor of heat too.

Hence, option D , i.e. all the options are correct.
Question 4
1 / -0

Which of the following fabrics is preferred for winter garments ?

A
Nylon

B
Cotton

C
Wool

D
Silk

Solution

Wool is the preferred fabric for winter garments. As wool is a bad conductor of heat, it insulates the body from the surrounding. Moreover, the air which is trapped in between the wool fibers prevents the flow of heat from our body to cool surrounding.
Question 5
1 / -0

A laboratory thermometer can not be used to measure

A
Temperature of ice

B
Temperature of pond water

C
Temperature of human body

D
Temperature of boiling water

Solution

Laboratory thermometer are used to take measurements in laboratories mainly. They can't be used to measure body temperature of a human. It is because of two reasons. :
$$(1)$$ Due to vast difference in the range of operating temperature.
$$(2)$$ Due to difference in time for which the indicated temperature is held at that level.
Hence, the answer is Temperature of human body.
Question 6
1 / -0

Which of the following is not a valid reason for using cotton clothes in Summer ?

A
Cotton clothes attract cool air.

B
Cotton clothes absorb sweat from the body.

C
Cotton exposes the sweat to atmosphere for evaporation

D
Cotton is light in weight.

Solution

We wear cotton clothes during summer as cotton absorbs sweat from the body exposing it to the atmosphere for easy evaporation. As we tend to sweat more during summer, the cotton fabric absorbs sweat and helps the body to cool down.
Question 7
1 / -0

A thermostat is?

A
A device used to maintain a constant temperature of a water bath or an oven

B
A modern type of thermoflask which work on the principle of equipartition of heat energy

C
An instrument by which the accuracy of thermometers is determined

D
A device which varies the temperature of a both

Solution

A thermostat is a device that automatically regulates temperature, or that activates a device when the temperature reaches a certain point.
Thus, it can be used to maintain a constant temperature of a water bath or an oven.
Hence, option A is correct.
Question 8
1 / -0

How does air trapped by the woolen fabric help ?

A
Air is a good conductor of heat and allows warm air to come near body

B
Air is a bad conductor of heat and allows body heat to escape into atmosphere

C
Air is a bad conductor of heat and doesn't allow body heat to escape into atmosphere

D
Air is a good conductor of heat and doesn't allow cool air to come near body.

Solution

Air trapped by the woolen fabric help us during winter. As air is bad conductor of heat and doesn't allow body heat to escape into atmosphere. The heat stored inside the body does not goes out as wool and air acts as a layer of insulator. And body heat is not escaped from the body.
Question 9
1 / -0

When a metal conductor connected to left gap of a meter bridge is heated, the balancing point.

A
Shifts towards right

B
Shifts towards left

C
Remains unchanged

D
Remains at zero

Solution

When resistor is heated its resistance increases hence the balancing point will shift towards right.
Question 10
1 / -0

What is the name of the process of heat transfer using electromagnetic waves?

A
Conduction

B
Convection

C
Evaporation

D
Radiation

Solution

Heat transfer is done by three ways conduction, convection and radiation. Radiation involves the energy transfer by electromagnetic radiations.

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Re-Attempt Weekly Quiz Competition

Heat Test - 24

Result

Heat Test - 24

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SHARING IS CARING

Question 1

Cotton is a bad conductor of heat and doesn't allow passage of warmer air near body.

Cotton is a good conductor of heat and allows body heat to escape in the atmosphere.

Cotton absorbs sweat from the body, exposing it to atmosphere for easy evaporation

None of the above

Solution

Question 2

Cotton clothes during summer

Woolen clothes during winter

Dark colored clothes during summer

Polyester raincoats during Rainy season

Solution

Question 3

Wool is an insulator of heat.

It traps a layer of air in its fabric.

Air being an insulator doesn't allow body heat to escape into the atmosphere.

All the above

Solution

Question 4

Nylon

Cotton

Wool

Silk

Solution

Question 5

Temperature of ice

Temperature of pond water

Temperature of human body

Temperature of boiling water

Solution

Question 6

Cotton clothes attract cool air.

Cotton clothes absorb sweat from the body.

Cotton exposes the sweat to atmosphere for evaporation

Cotton is light in weight.

Solution

Question 7

A device used to maintain a constant temperature of a water bath or an oven

A modern type of thermoflask which work on the principle of equipartition of heat energy

An instrument by which the accuracy of thermometers is determined

A device which varies the temperature of a both

Solution

Question 8

Air is a good conductor of heat and allows warm air to come near body

Air is a bad conductor of heat and allows body heat to escape into atmosphere

Air is a bad conductor of heat and doesn't allow body heat to escape into atmosphere

Air is a good conductor of heat and doesn't allow cool air to come near body.

Solution

Question 9

Shifts towards right

Shifts towards left

Remains unchanged

Remains at zero

Solution

Question 10

Conduction

Convection

Evaporation

Radiation

Solution

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