Heat Test

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Heat Test - 1

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Weekly Quiz Competition

Question 1
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A wooden spoon is dipped in cup of ice-cream, its other end

A
Become cold by radiation

B
Become cold by conduction

C
Become cold by convection

D
Does not become cold

Solution

Explanation:

Wooden spoon is poor conductor of heat. It does not allow heat to pass through them easily,so a wooden spoon dipped in cup of ice-cream does not become cold.
Question 2
1 / -0

Normal body temperature is

A
39°C

B
17°C

C
27°C

D
37°C

Solution

Explanation:

Normal body temperature is about 37 Degree Celcius which may vary with person to person.It could be slightly higher or slightly lighter. Normal temperature is the average body temperature of a large number of healthy persons.
Question 3
1 / -0

Which of the following is an insulator

A
Air

B
Graphite

C
Aluminium rod

D
Copper rod

Solution

Explanation:

Those substances that do not allow heat to pass through them easily are poor conductors of heat and they are known as insulators. Copper, aluminium and graphite is conductor but air is a poor conductor of heat, so its is an insulator.
Question 4
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Temperature changes with change in

A
Heat energy

B
Velocity

C
Magnitude

D
Vibration

Solution

Explanation:

With increase in heat energy the particles of matters start moving faster that increases the temperature of the body.
Question 5
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Method of heat transfer in steel rod is

A
Convection

B
All of these

C
Conduction

D
Radiation

Solution

Explanation:

Heat transfer in steel rod is by the process of conduction because in metal heat transfer takes place by way of conduction. Conduction is the process by which heat is transferred from the hotter end to the colder end of an object.
Question 6
1 / -0

Ventilation in room is due to

A
Radiation

B
Conduction

C
Both radiation and conduction

D
Convection

Solution

Explanation:

Ventilation in room is due to convection as it circulates air in the house.There is constant supply of fresh air and this removes the air present before.The process of convection takes place inside the room. Hot air moves upward and the fresh air from the ventilation comes in to takes its place..
Question 7
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Conduction takes place in

A
Solid, Gas, Liquid

B
Gases only

C
Liquid only

D
Solid only

Solution

Explanation:

Conduction takes place in solid because in solids particles are close to each other to transfer the heat to adjacent particles.Materials which allow heat to pass through them easily are conductors of heat.Metals are good conductors of heat and plastics are bad conductors of heat.The do not allow heat to pass through them easily.
Question 8
1 / -0

Clinical thermometer has marking from 35°C to

A
32°C

B
62°C

C
52°C

D
42°C

Solution

Explanation:

Clinical thermometer is used to measure body temperature. It has marking from 35 degree C to 42 degree C. A clinical thermometer consists of a long, uniform glass tube having a bulb at one end.This bulb contains a mercury.We should always wash a clinical thermometer with an antiseptic solution before using.
Question 9
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Heat of sun reaches to earth by

A
Through air.

B
Conduction

C
Convection

D
Radiation

Solution

Explanation:

Heat of sun reaches to earth by the process of radiation.The transfer of heat by radiation does not require any medium.All hot bodies radiate heat. When this heat falls on some object. a part of it is reflected, a part is absorbed and a part may be transmitted.
Question 10
1 / -0

Thermos flask keeps hot liquid hot and cold liquid cold by

A
Preventing heat loss

B
Cooling

C
Using coolant

D
Heating

Solution

Explanation:

Thermos flask containers keep a hot liquid hot and cold liquid coldfor a long time by preventing the loss or gain of heatenergy due to conduction, convection and radiation. Thermos flask have two layers and there is a vacuum between the two layers to prevent heat loss to keep hot liquid hot and cold liquid cool.

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Heat Test - 1

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Heat Test - 1

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SHARING IS CARING

Question 1

Become cold by radiation

Become cold by conduction

Become cold by convection

Does not become cold

Solution

Question 2

39°C

17°C

27°C

37°C

Solution

Question 3

Air

Graphite

Aluminium rod

Copper rod

Solution

Question 4

Heat energy

Velocity

Magnitude

Vibration

Solution

Question 5

Convection

All of these

Conduction

Radiation

Solution

Question 6

Radiation

Conduction

Both radiation and conduction

Convection

Solution

Question 7

Solid, Gas, Liquid

Gases only

Liquid only

Solid only

Solution

Question 8

32°C

62°C

52°C

42°C

Solution

Question 9

Through air.

Conduction

Convection

Radiation

Solution

Question 10

Preventing heat loss

Cooling

Using coolant

Heating

Solution

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