Thermal Properties of Matter Test

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Thermal Properties of Matter Test - 18

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Question 1
1 / -0

During day time the air becomes warm due to the process of-

A
conduction

B
convection

C
radiation

D
expansion

Solution

During day time the air becomes warm due to process of radiation.
Heat transfer through radiation takes place in form of electromagnetic waves mainly in infrared region. Radiation emitted by a body is consequence of thermal agitation of its composing molecules.
Question 2
1 / -0

Convection cannot take place in_______

A
solids

B
liquids

C
gases

D
None of the above

Solution

Convection can't take place in solids.
Convection is transfer of heat through fluid (liquid or gas) caused by molecular motion.
Question 3
1 / -0

A device in which heat loss due to conduction, convection and radiation is minimized is :

A
solar cooker

B
thermos flask

C
thermometer

D
electric heater

Solution

Thermos flask is the device in which heat loss due to conduction, convection and radiation is minimized.
The silver coating on the inner bottle prevents heat transfer by radiation, and the vacuum between its double wall prevents heat moving by convection. The thinness of glass walls stops heat transfer by conduction. The case surrounding the flask provides additional insulation.
Question 4
1 / -0

The water at the surface of swimming pool or lake being warmer due to

A
Radiation

B
Convection

C
Conduction

D
None

Solution

The surface water of a swimming pool or a lake is exposed to the sun. It receives sunlight in the form of radiation. This radiation supplies heat to the surface water and hence it becomes warm.
Question 5
1 / -0

Select the odd one out (conduction, convection, radiation, expansion)

A
conduction

B
convection

C
radiation

D
expansion

Solution

All are modes of heat transfer while expansion is an effect of heat
Question 6
1 / -0

The absolute zero is the temperature at which:

A
all substances exist is solid state

B
molecular motion ceases

C
water freezes

D
none of these

Solution

Absolute zero is the temperature at which molecular motion ceases when vibrational energy exists
Question 7
1 / -0

Liquid generally ........ on heating and ........ on cooling

A
Contract, no change

B
Expand, contract

C
Contract, expand

D
Expand, no change

Solution

Liquids generally expand on heating and contract on cooling. However, water is a liquid which does not behave live the normal liquid.
Question 8
1 / -0

In case of liquids and gases,when temperature increases

A
Volume is not altered much

B
Volume increases appreciably

C
Density increases

D
All

Solution

In case of liquids and gases,when temperature increases the volume increases by an appreciable amount and therefore the decrease in density is quite considerable.
Question 9
1 / -0

Thermal radiation is also called

A
infrared radiation

B
EM radiation

C
nuclear radiation

D
None

Solution

Thermal radiation does not include any contact between hot body and cold body. It transfers heat without any medium. It falls within infrared zone of electromagnetic radiation, so it is also called $$infrared \ radiation.$$
Question 10
1 / -0

By the process of convection, the transfer of heat is always

A
Vertically downwards

B
Vertically upwards

C
Both

D
None

Solution

By the process of convection, heat is always transferred vertically upwards. This happens because the medium particles near the source of heat absorb heat from the source, their volume expands, their density becomes lighter and they start moving upwards.

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Thermal Properties of Matter Test - 18

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Thermal Properties of Matter Test - 18

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SHARING IS CARING

Question 1

conduction

convection

radiation

expansion

Solution

Question 2

solids

liquids

gases

None of the above

Solution

Question 3

solar cooker

thermos flask

thermometer

electric heater

Solution

Question 4

Radiation

Convection

Conduction

None

Solution

Question 5

conduction

convection

radiation

expansion

Solution

Question 6

all substances exist is solid state

molecular motion ceases

water freezes

none of these

Solution

Question 7

Contract, no change

Expand, contract

Contract, expand

Expand, no change

Solution

Question 8

Volume is not altered much

Volume increases appreciably

Density increases

All

Solution

Question 9

infrared radiation

EM radiation

nuclear radiation

None

Solution

Question 10

Vertically downwards

Vertically upwards

Both

None

Solution

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