A fan produces a feeling of comfort during hot weather, because

our body radiates more heat in air

our perspiration evaporates rapidly

When water is heated from 0 C to 10 C, its volume

first decreases and then increases

If a liquid is heated in space under no gravity, the transfer of heat will take place by process of

can not be heated in the absence of gravity

Evening Sun is not as hot as the mid day sun. What is the reason?

In the evening, radiation travel slowly

In the evening, the temperature of the sun decreases

Ozone in atmosphere absorbs more light in the evening

In the evening, radiations travels larger distance through atmosphere

Why do two ice blocks join to from one block when pressed together?

Melting point of ice increases with increase in pressure

Melting point of ice is lowered with increase in pressure

Melting point of ice increases with increase in pressure

Melting point of ice remains unchanged with increase in pressure

The sprinkling of water slightly reduces the temperature of a closed room because

water is a bad conductor of heat

temperature of water is less than that of the room

water has large latent heat of vaporisation

water is a bad conductor of heat

Thermostat is a device which

automatically regulates the pressure of a system

automatically regulates the temperature of a system

automatically regulates the pressure of a system

If the doors of a refrigerator are left open for a few hours, the room temperature will

decrease only in the area in the vicinity of the refrigerator

Refrigeration helps in food preservation by

reducing the rate of biochemical reactions

sealing the food with a layer of ice

Two bodies A and B are of same mass and same amount of heat is given to both of them.If the temperature of A increases more than that of B because of heat addition, then.

Both A and B have the same specific heat capacity but A has greater thermal conductivity

The specific heat capacity of A is more than that of B

The specific heat capacity of A is less than that of B

Both A and B have the same specific heat capacity but A has greater thermal conductivity

Both A and B have the same specific heat capacity but B has greater thermal conductivity

our body radiates more heat in air

our perspiration evaporates rapidly

Melting point of ice increases with increase in pressure

Melting point of ice is lowered with increase in pressure

Melting point of ice increases with increase in pressure

Melting point of ice remains unchanged with increase in pressure

In the evening, radiation travel slowly

In the evening, the temperature of the sun decreases

Ozone in atmosphere absorbs more light in the evening

In the evening, radiations travels larger distance through atmosphere

decrease only in the area in the vicinity of the refrigerator

automatically regulates the pressure of a system

automatically regulates the temperature of a system

automatically regulates the pressure of a system

reducing the rate of biochemical reactions

sealing the food with a layer of ice

A gas behaves as an ideal gas more closely at

High pressure and high temperature

Low pressure and high temperature

High pressure and low temperature

Low pressure and low temperature

High pressure and high temperature

205 + Mcqs in Heat in Physics Page 1 McqOptions

1.	A fan produces a feeling of comfort during hot weather, because
A.	our body radiates more heat in air
B.	fan supplies cool air
C.	conductivity of air increases
D.	our perspiration evaporates rapidly
Answer» E.

Discussion

2.	A man with a dark skin, in comparison with a man with a white skin, will experience
A.	less heat and less cold
B.	less heat and more cold
C.	more heat and less cold
D.	more heat and more cold
Answer» D. more heat and more cold

Discussion

3.	When water is heated from 0 C to 10 C, its volume
A.	increases
B.	decreases
C.	does not change
D.	first decreases and then increases
Answer» E.

Discussion

4.	If a liquid is heated in space under no gravity, the transfer of heat will take place by process of
A.	conduction
B.	convection
C.	radiation
D.	can not be heated in the absence of gravity
Answer» D. can not be heated in the absence of gravity

Discussion

5.	Evening Sun is not as hot as the mid day sun. What is the reason?
A.	In the evening, radiation travel slowly
B.	In the evening, the temperature of the sun decreases
C.	Ozone in atmosphere absorbs more light in the evening
D.	In the evening, radiations travels larger distance through atmosphere
Answer» E.

Discussion

6.	L.P.G. is mostly liquefied
A.	hydrogen
B.	oxygen
C.	butane
D.	methane
Answer» D. methane

Discussion

7.	Why do two ice blocks join to from one block when pressed together?
A.	Melting point of ice is lowered with increase in pressure
B.	Melting point of ice increases with increase in pressure
C.	Melting point of ice remains unchanged with increase in pressure
D.	Melting point of ice 0 C
Answer» B. Melting point of ice increases with increase in pressure

Discussion

8.	Compared to burn due to air at 100 C, a burn due to steam at 100 C is
A.	Less dangerous
B.	more dangerous
C.	equally dangerous
D.	None of these
Answer» C. equally dangerous

Discussion

9.	Pyrometer is used to measure
A.	air pressure
B.	humidity
C.	high temperature
D.	intensity of earthquake
Answer» D. intensity of earthquake

Discussion

10.	The sprinkling of water slightly reduces the temperature of a closed room because
A.	temperature of water is less than that of the room
B.	specific heat of water is high
C.	water has large latent heat of vaporisation
D.	water is a bad conductor of heat
Answer» D. water is a bad conductor of heat

Discussion

11.	Which one of the following liquids is very good conductor of heat ?
A.	Mercury
B.	Water
C.	Ether
D.	Benzene
Answer» B. Water

Discussion

12.	During the change of state of matter the temperature of the substance
A.	increases
B.	decreases
C.	remain the same
D.	may increases or decrease
Answer» D. may increases or decrease

Discussion

13.	When water is heated from 0 C to 4 C, its volume
A.	increases
B.	decreases
C.	first increase then decrease
D.	remains the same
Answer» C. first increase then decrease

Discussion

14.	Heat detectors in human skin are sensitive to wavelengths
A.	> 780 nm
B.	600 - 780 nm
C.	400 - 600 nm
D.	< 400 nm
Answer» E.

Discussion

15.	A metal sheet with a circular hole is heated. The hole
A.	gets larger
B.	gets smaller
C.	remains of the same size
D.	gets deformed
Answer» B. gets smaller

Discussion

16.	Thermostat is a device which
A.	measures heat
B.	measures temperature
C.	automatically regulates the temperature of a system
D.	automatically regulates the pressure of a system
Answer» D. automatically regulates the pressure of a system

Discussion

17.	Air is filled in vehicle tyres because
A.	it is non-conducting
B.	it is cheap
C.	it has low density
D.	it is highly compressible
Answer» E.

Discussion

18.	The safest temperature for keeping food fresh in a refrigerator is
A.	4 C
B.	8 C
C.	0 C
D.	10 C
Answer» B. 8 C

Discussion

19.	If the doors of a refrigerator are left open for a few hours, the room temperature will
A.	decreases
B.	increases
C.	remain the same
D.	decrease only in the area in the vicinity of the refrigerator
Answer» C. remain the same

Discussion

20.	The instrument used to measure the temperature of the source from its thermal radiation is
A.	hydrometer
B.	barometer
C.	thermopile
D.	pyrometer
Answer» D. pyrometer

Discussion

21.	Scent sprayer is based on
A.	Charles's law
B.	Boyle's law
C.	Archimedes's principle
D.	Bernoulli's principle
Answer» E.

Discussion

22.	Cooling is not done by
A.	flow of water
B.	release of compressed gas
C.	burning cooking gas
D.	melting the solid
Answer» D. melting the solid

Discussion

23.	Refrigeration helps in food preservation by
A.	Killing the germs
B.	reducing the rate of biochemical reactions
C.	destroying enzyme action
D.	sealing the food with a layer of ice
Answer» C. destroying enzyme action

Discussion

24.	When ice melts, then the
A.	volume increases
B.	volume decreases
C.	mass increases
D.	mass decrease
Answer» C. mass increases

Discussion

25.	At which temperature the Centigrade and Fahrenheit scales are equal ?
A.	40
B.	- 40
C.	37
D.	94.6
Answer» C. 37

Discussion

26.	When air is saturated, it cannot hold
A.	More water vapour
B.	More air
C.	More CO
D.	More O
Answer» B. More air

Discussion

27.	The unit of RH are
A.	kg-m
B.	kg
C.	kg-m
D.	none of these
Answer» E.

Discussion

28.	A sample of gas expands from volume V₁ to V₂ The amount of work done by the gas is greatest when the expansion is
A.	Iso-thermal
B.	Isobaric
C.	Adiabatic
D.	Equal in all cases
Answer» C. Adiabatic

Discussion

29.	Specific heat of a metal at very low temperatures varies as
A.	T
B.	T
C.	T
D.	T
Answer» B. T

Discussion

30.	Which of the following statement (s) is (are) true about thermal radiations? (i) Thermal radiation are electromagnetic waves (ii) All bodies emit thermal radiations at all temperature (iii) Thermal radiations are reflected from mirror (iv) Thermal radiations of all wavelengths travel in free space with same velocity Choose the correct answer
A.	(i), (ii) and (iii)
B.	(ii), (iii) and (iv)
C.	(iii) and (iv)
D.	All of them
Answer» E.

Discussion

31.	Which of the following statements are true regarding heat? 1. Heat is a form of energy 2. Heat can be reflected by mirror 3. Heat is an electromagnetic radiation 4. Heat can not pass through vacuum Select the correct answer from the codes given below Codes :
A.	1, 2 and 3
B.	2, 3 and 4
C.	1, 2 and 4
D.	1, 3 and 4
Answer» E.

Discussion

32.	Consider the following statements 1. Steam at 100 C contain same amount of heat 2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water 3. In air-conditioner, coils and is rejected out at the condenser coils Which of these statements is / are correct ?
A.	1 and 2
B.	2 and 3
C.	Only 2
D.	Only 3
Answer» E.

Discussion

33.	Two bodies A and B are of same mass and same amount of heat is given to both of them. If the temperature of A increases more than that of B because of heat addition, then.
A.	The specific heat capacity of A is more than that of B
B.	The specific heat capacity of A is less than that of B
C.	Both A and B have the same specific heat capacity but A has greater thermal conductivity
D.	Both A and B have the same specific heat capacity but B has greater thermal conductivity
Answer» C. Both A and B have the same specific heat capacity but A has greater thermal conductivity

Discussion

34.	Compared to burn
A.	Less dangerous
B.	more dangerous
C.	equally dangerous
D.	None of these
Answer» C. equally dangerous

Discussion

35.	A fan
A.	our body radiates more heat in air
B.	fan supplies cool air
C.	conductivity of air increases
D.	our perspiration evaporates rapidly
Answer» E.

Discussion

36.	A man with a
A.	less heat and less cold
B.	less heat and more cold
C.	more heat and less cold
D.	more heat and more cold
Answer» D. more heat and more cold

Discussion

37.	During the change of state of matter the
A.	increases
B.	decreases
C.	remain the same
D.	may increases or decrease
Answer» D. may increases or decrease

Discussion

38.	L.P.G.
A.	hydrogen
B.	oxygen
C.	butane
D.	methane
Answer» D. methane

Discussion

39.	Why do two
A.	Melting point of ice is lowered with increase in pressure
B.	Melting point of ice increases with increase in pressure
C.	Melting point of ice remains unchanged with increase in pressure
D.	Melting point of ice 0 C
Answer» B. Melting point of ice increases with increase in pressure

Discussion

40.	Evening Sun
A.	In the evening, radiation travel slowly
B.	In the evening, the temperature of the sun decreases
C.	Ozone in atmosphere absorbs more light in the evening
D.	In the evening, radiations travels larger distance through atmosphere
Answer» E.

Discussion

41.	If the doors of a
A.	decreases
B.	increases
C.	remain the same
D.	decrease only in the area in the vicinity of the refrigerator
Answer» C. remain the same

Discussion

42.	Thermostat
A.	measures heat
B.	measures temperature
C.	automatically regulates the temperature of a system
D.	automatically regulates the pressure of a system
Answer» D. automatically regulates the pressure of a system

Discussion

43.	Pyrometer
A.	air pressure
B.	humidity
C.	high temperature
D.	intensity of earthquake
Answer» D. intensity of earthquake

Discussion

44.	Heat detectors
A.	> 780 nm
B.	600 - 780 nm
C.	400 - 600 nm
D.	< 400 nm
Answer» E.

Discussion

45.	Scent sprayer
A.	Charles's law
B.	Boyle's law
C.	Archimedes's principle
D.	Bernoulli's principle
Answer» E.

Discussion

46.	Cooling
A.	flow of water
B.	release of compressed gas
C.	burning cooking gas
D.	melting the solid
Answer» D. melting the solid

Discussion

47.	At which temperature the
A.	40
B.	- 40
C.	37
D.	94.6
Answer» C. 37

Discussion

48.	Refrigeration
A.	Killing the germs
B.	reducing the rate of biochemical reactions
C.	destroying enzyme action
D.	sealing the food with a layer of ice
Answer» C. destroying enzyme action

Discussion

49.	A gas behaves as an ideal gas more closely at
A.	Low pressure and high temperature
B.	High pressure and low temperature
C.	Low pressure and low temperature
D.	High pressure and high temperature
Answer» D. High pressure and high temperature

Discussion

50.	The heat transferred by the radiator of a refrigerator is
A.	More than that a t the freezer
B.	Less than that at the freezer
C.	The same that at the freezer
D.	None of the above
Answer» B. Less than that at the freezer

Discussion

Explore topic-wise MCQs in Physics.

A fan produces a feeling of comfort during hot weather, because

A man with a dark skin, in comparison with a man with a white skin, will experience

When water is heated from 0 C to 10 C, its volume

If a liquid is heated in space under no gravity, the transfer of heat will take place by process of

Evening Sun is not as hot as the mid day sun. What is the reason?

L.P.G. is mostly liquefied

Why do two ice blocks join to from one block when pressed together?

Compared to burn due to air at 100 C, a burn due to steam at 100 C is

Pyrometer is used to measure

The sprinkling of water slightly reduces the temperature of a closed room because

Which one of the following liquids is very good conductor of heat ?

During the change of state of matter the temperature of the substance

When water is heated from 0 C to 4 C, its volume

Heat detectors in human skin are sensitive to wavelengths

A metal sheet with a circular hole is heated. The hole

Thermostat is a device which

Air is filled in vehicle tyres because

The safest temperature for keeping food fresh in a refrigerator is

If the doors of a refrigerator are left open for a few hours, the room temperature will

The instrument used to measure the temperature of the source from its thermal radiation is

Scent sprayer is based on

Cooling is not done by

Refrigeration helps in food preservation by

When ice melts, then the

At which temperature the Centigrade and Fahrenheit scales are equal ?

When air is saturated, it cannot hold

The unit of RH are

A sample of gas expands from volume V1 to V2 The amount of work done by the gas is greatest when the expansion is

Specific heat of a metal at very low temperatures varies as

Which of the following statements are true regarding heat?1. Heat is a form of energy2. Heat can be reflected by mirror3. Heat is an electromagnetic radiation4. Heat can not pass through vacuumSelect the correct answer from the codes given below Codes :

Consider the following statements 1. Steam at 100 C contain same amount of heat2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water3. In air-conditioner, coils and is rejected out at the condenser coilsWhich of these statements is / are correct ?

Two bodies A and B are of same mass and same amount of heat is given to both of them.If the temperature of A increases more than that of B because of heat addition, then.

Compared to burn

A fan

A man with a

During the change of state of matter the

L.P.G.

Why do two

Evening Sun

If the doors of a

Thermostat

Pyrometer

Heat detectors

Scent sprayer

Cooling

At which temperature the

Refrigeration

A gas behaves as an ideal gas more closely at

The heat transferred by the radiator of a refrigerator is

A sample of gas expands from volume V₁ to V₂ The amount of work done by the gas is greatest when the expansion is

Which of the following statements are true regarding heat?
1. Heat is a form of energy
2. Heat can be reflected by mirror
3. Heat is an electromagnetic radiation
4. Heat can not pass through vacuum
Select the correct answer from the codes given below
Codes :

Consider the following statements
1. Steam at 100 C contain same amount of heat
2. Latent heat of fusion of ice is equal to the latent heat of vaporization of water
3. In air-conditioner, coils and is rejected out at the condenser coils
Which of these statements is / are correct ?

Two bodies A and B are of same mass and same amount of heat is given to both of them.
If the temperature of A increases more than that of B because of heat addition, then.