MCQ solutions for Science and Technology Part 1 chapter 5 – Heat

1) The heat energy absorbed at constant temperature by unit mass of a solid to convert into liquid is called…………… .
A ) Specific latent heat of fusion
B ) Specific latent heat of vaporization
Ans A ) Specific latent heat of fusion

2 ) Different substances have different melting points but same boiling points.
A ) True
B ) False
Ans B ) False

3 ) The amount of water vapor needed to saturate the air depends on.
A ) Humidity
B ) Dew point
C ) Temperature of the air
D ) Absolute humidity
Ans C ) Temperature of the air

4 ) Name the above apparatus.

hopes-appratus

 

A ) Hope’s apparatus                                                                                  B ) Calorimeter
Ans A ) Hope’s apparatus

5 ) One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be…………… .
A ) 80°C
B ) More than 50°C but less than 80°C
C ) 20°C
D ) Between 30°C and 50°C
Ans D ) Between 30°C and 50°C

6 ) In SI system, heat is measured in …………… .
A ) Joule
B ) Calorie
Ans A ) Joule

7 ) In winter season, as the plane flies, the vapor released by the aeroplane engine condenses and forms clouds.
A ) True
B ) False
Ans A ) True

8 ) The heat energy absorbed at constant temperature during transformation of liquid into gas is called …………… .
A ) Latent heat of fusion
B ) Latent heat of vaporization
Ans B ) Latent heat of vaporization

9 ) When air cools, it becomes saturated with water vapor and excess of water vapor is converted into tiny
droplets.
A ) True
B ) False
Ans A ) True

10 ) The crumbling of the rock is due to the anomalous expansion of water.
A ) True
B ) False
Ans A ) True

11 ) The presence of water vapor in the atmosphere.
A ) Humidity
B ) Absolute humidity
C ) Relative humidity
D ) Dew point
Ans A ) Humidity

12 ) The amount of water vapor in the atmosphere helps us to understand the state of daily weather.
A ) True
B ) False
Ans A ) True

13 )Which out of the two thermometers will record the decrease in temperature first?


A ) T1
B ) T2
Ans A ) T1

14 ) During transition from liquid phase to gaseous state, the temperature remains constant.
A ) True
B ) False
Ans A ) True

15 ) The specific heat of water is …………… .
A ) Temperature, 1°C
B ) J/kg°C
C ) ‘c’
D ) 1 cal/g°C
Ans D ) 1 cal/g°C

16 ) The conversion of ice to water takes place at …………… temperature.
A ) Critical
B ) Constant
Ans B ) Constant

17 ) Melting point of solid decreases as we go higher than sea level.
A ) True
B ) False
Ans B ) False

18 ) The latent heat of an object can be measured using mixing method.
A ) True
B ) False
Ans B ) False

19 ) Absolute humidity is measured in percentage.
A ) True
B ) False
Ans B ) False

20 ) Which sphere absorbs more heat from water?
A ) Iron
B ) Copper
C ) Lead
Ans A ) Iron

21 ) When the air contains maximum possible water vapor, it is said to be saturated with vapor at that temperature.
A ) True
B ) False
Ans A ) True

22 ) The values of melting and boiling point depends on atmospheric pressure.
A ) True
B ) False
Ans A ) True

23 ) The amount of heat energy required to raise the …………… of a unit mass of an object by …………… is called the specific heat of that object.
A ) 1°C, cal/g 0 C
B ) Cal/g°C, temperature
C ) 1 cal/g°C, 1°C
D ) Temperature, 1°C
Ans D ) Temperature, 1°C

24 ) The formula for calculating specific heat is …………… .
A ) ‘c’
B ) cal/g°C
C ) 1 cal/g°C
D ) m x c x T
Ans D ) m x cx T

25 ) The melting point of ice becomes higher than 0°C due to pressure.
A ) True
B ) False
Ans B ) False

26 ) At …………… temperature water starts converting into steam.
A ) 0°C
B ) 100°C
Ans B ) 100°C

27 ) The mass of water vapor per unit volume of air.
A ) Humidity
B ) Absolute humidity
C ) Relative humidity
D ) Dew point

Ans B ) Absolute humidity
28 ) If water is heated from 0°C upto 4°C, it …………… .
A ) Expands
B ) Contracts
Ans B ) Contracts

29 ) The temperature at which the air gets saturated with water vapor.
A ) Humidity
B ) Absolute humidity
C ) Relative humidity
D ) Dew point
Ans D ) Dew point

30 ) Calorimeter is used to measure the specific heat of an object.
A ) True
B ) False
Ans A ) True

31 ) In a calorimeter, heat lost by hot object is equal to heat gained by calorimeter plus heat gained by water.
A ) True
B ) False
Ans A ) True

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32 ) Between the temperature 0°C to 4°C, the volume …………… .
A ) Increases
B ) Decreases
Ans B ) Decreases

33 ) Conversion of heat energy to work gives the second law of thermodynamics.
A ) True
B ) False
Ans B ) False

34 ) The SI unit of temperature is …………… .
A ) °C
B ) °F
C ) °K
D ) K
Ans D ) K

35 ) When a liquid is cooled upto a certain temperature, it …………… .
A ) Expands
B ) Contracts
Ans B ) Contracts

36 ) During transition of solid phase to liquid, the heat energy is utilized for …………… bonds between the atoms or molecules in the solid.
A ) Binding
B ) Weakening
Ans B ) Weakening
37 ) Name the phenomenon that takes place by studying the above graph.graph-between-the-value-and-temperature-of-water-
A ) Anomalous behavior of water
B ) Specific heat capacity of water
C ) Latent heat of water
Ans A ) Anomalous behavior of water

38 ) The specific heat capacity is denoted by letter …………… .
A ) Cal/g°C
B ) j / kg C
C ) Temperature, 1°C
D ) C
Ans D ) C

39 ) At 4°C, the volume of water is …………… .
A ) Maximum
B ) Minimum
Ans B ) Minimum

40 ) All the bodies expand …………… on heating.
A ) Uniformly
B ) Constantly
Ans A ) Uniformly

41 ) No medium is required for transfer of heat by the process of …………… .
A ) Conduction
B ) Radiation
C ) Convection
Ans B ) Radiation

42 ) As soon as pressure is removed, the melting point of ice is restored to 0°C.
A ) True
B ) False
Ans A ) True

43 ) Absolute humidity is measured in.
A ) Kg/m
B ) Kg/m
C ) Kg
D ) Kg/m
Ans A ) Kg/m

44 ) The heat energy absorbed at constant temperature during transformation of solid into liquid is called …………… .
A ) Latent heat of fusion
B ) Latent heat of vaporization
Ans A ) Latent heat of fusion

45 ) At …………… temperature, ice converts into water.
A ) 0°C
B ) 100°C
Ans A ) 0°C

46 ) At 0°C, ice gets converted into water on applying pressure.
A ) True
B ) False
Ans A ) True

47 ) 1 calorie = …………… joule.
A ) 4.18
B ) 0.418
C ) 41.8
Ans A ) 4.18

48 ) The dew point temperature is decided by the amount of vapor in the air.
A ) True
B ) False
Ans A ) True

49 ) The density of water is …………… at 4°C
A ) Maximum
B ) Minimum
Ans A ) Maximum

50 ) Heat energy lost by the hot object is equal to heat energy gained by cold object.
A ) True
B ) False
Ans A ) True

51 ) If air temperature is low, it will need more vapor to saturate the air.
A ) True
B ) False
Ans B ) False

52 ) …………… is a measure of degree of hotness or coldness of an object.
A ) Heat
B ) Temperature
Ans B ) Temperature

53 ) Give one example of the above phenomenon.


A ) Crack in water pipes in cold countries.                                               B ) Dew drops in early morning.
Ans A ) Crack in water pipes in cold countries.

54 ) Ice: 80cal/g:: Water: …………… .
A ) 540 cal/g
B ) 530cal/g
C ) 540g/cal
Ans A ) 540 cal/g

55 ) An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will …………… .
A ) Flow from iron ball to water
B ) Not flow from iron ball to water or from water to iron ball
C ) Flow from water to iron ball
D ) Increase the temperature of both.

Ans B ) Not flow from iron ball to water or from water to iron ball
56 ) Aquatic plants and animals survive even when the atmospheric temperature goes below 0°C.
A ) True
B ) False
Ans A ) True

57 ) The constant temperature at which the ice converts into water is called the …………… .
A ) Boiling point of water
B ) Melting point of ice
Ans B ) Melting point of ice

58 ) Name the phenomenon that is studied using this apparatus.A ) Latent heat

B ) Anomalous behavior
Ans B ) Anomalous behavior

59 ) Humidity is measured by relative humidity.
A ) True
B ) False
Ans A ) True
60 ) What will be the final readings of both the thermometers at the end of the experiment?hopes-appratus
A ) 4°C
B ) 0°C
Ans B ) 0°C

61 ) The behavior of water between its temperatures from 0°C to 4°C is called …………… .
A ) Anomalous behavior of water
B ) Specific heat of water
Ans A ) Anomalous behavior of water

62 ) Observe the figure and answer the questions below. In the figure, graph shows the relation between …………… and ……………          graph-between-the-value-and-temperature-of-water-               A ) Time and temperature
B ) Volume and density
C ) Volume and temperature
Ans C ) Volume and temperature

63 ) The heat energy absorbed at constant temperature during transformation of liquid to solid is called the latent
heat of fusion.
A ) True
B ) False
Ans B ) False

64 ) Heat energy is released by water during its transformation from liquid phase to gases phase.
A ) True
B ) False
Ans B ) False

65 ) The amount of heat necessary to raise the temperature of 1kg of water by 1°C from 14.5°C to 15.5°C.
A ) One cal heat
B ) One kcal heat
C ) Latent heat
Ans B ) One kcal heat

66 ) In CGS system, heat is measured in …………… .
A ) Joule
B ) Calorie
Ans B ) Calorie

67 ) If the relative humidity is more than 60%, then the air is …………… .
A ) Humid
B ) Dry
Ans A ) Humid

68 ) At dew point, the relative humidity is …………… .
A ) 10%
B ) 50%
C ) 60%
D ) 100%
Ans D ) 100%
69 ) The graph shows the exceptional behavior of …………… between temperatures 0°C to 4°C.           
A ) Water
B ) Steam
C ) Liquid
Ans A ) Water

70 ) It is not essential to define a specific temperature range while defining the unit of heat.
A ) True
B ) False
Ans B ) False

71 ) Which sphere will go deeper in the wax?
A ) Iron
B ) Copper
C ) Lead
Ans A ) Iron

72 ) The SI unit of specific heat is …………… .
A ) ‘c’
B ) J/kg°C
C ) m x cx T
D ) 1 cal/g°C
Ans B ) J/kg°C

73 ) The amount of heat necessary to raise the temperature of 1g of water by 1°C from 14.5°C to 15.5°C.
A ) One cal heat
B ) One kcal heat
C ) Latent heat
Ans A ) One cal heat

74 ) 1kcal = …………… cal.
A ) 10
B ) 100
C ) 1000
Ans C ) 1000

75 ) When a liquid is heated upto a certain temperature, it …………… .
A ) Expands
B ) Contracts
Ans A ) Expands

76 ) CGS unit of heat : Calorie:: CGS unit of specific latent heat : …………… .
A ) Cal/°C
B ) Cal/g
C ) Cal/°C.g
Ans B ) Cal/g

77 ) The above experiment is based on which property? specific-heat-of-mea
A ) Latent heat Capacity
B ) Specific heat capacity
Ans B ) Specific heat capacity

78 ) Name the mixture used in this apparatus.
A ) Ice + water
B ) Ice + salt
Ans B ) Ice + salt

79 ) Calorimeter works on the principle of heat exchange.
A ) True
B ) False
Ans A ) True
80 ) Is the statement True or False, The three spheres absorbed different amount of heat from boiling water. specific-heat-of-mea
A ) True
B ) False
Ans A ) True

81 ) The constant temperature at which the water converts into steam is called the ……………
A ) Boiling point of water
B ) Melting point of ice
Ans A ) Boiling point of water

82 ) Name the phenomenon that is studied using Hope’s apparatus.
A ) Latent heat
B ) Anomalous behavior
Ans B ) Anomalous behavior

83 ) If the relative humidity is less than 60%, then the air is …………… .
A ) Humid
B ) Dry
Ans B ) Dry

84 ) The SI unit of heat is named after the scientist …………… .
A ) James Prescott Joule
B ) Joseph Prescott Joule
C ) Max Planck
Ans A ) James Prescott Joule

85 ) The CGS unit of specific heat is …………… .
A ) cal/g°C
B ) 1 cal/g°C
C ) m x cx T
D ) ‘c’
Ans A ) cal/g°C

86 ) Anomalous behavior of water can be studied by calorimeter.
A ) True
B ) False
Ans B ) False

87 ) If water is heated beyond 4°C, it …………… .
A ) Expands
B ) Contracts
Ans A ) Expands

88 ) The heat energy absorbed at constant temperature by unit mass of a liquid to convert into gaseous phase is
called …………… .
A ) Specific latent heat of fusion
B ) Specific latent heat of vaporization
Ans B ) Specific latent heat of vaporizatio

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