CHAPTER 11 HEAT AND THERMODYNAMIC
CHAPTER 11
HEAT AND THERMODYNAMIC
TEST-2
41.The linear thermal expansion is
related to:
a) Liquids
only
b) Gases only
c) Both liquids
and gases d) Solids only
42.When most substances are heated:
a) They
expand
b) Their volume increases
c) Their density
decreases d) All of these
43.The change in volume per unit volume
per Kelvin rise in temperature is called:
a) Coefficient
of linear expansion
b) Coefficient of thermal conductivity
c) Temperature
coefficient d) Coefficient of volume expansion
44.An inflated tyre suddenly bursts, due
to which the temperature of air:
a) Decreases
b) Increases
c) Remains the
same d) None of these
45.SI unit of coefficient of linear
expansion (or volume expansion) is:
a) C°
b) K°
c) C°-1 d) K°-1
46.The energy of molecular motion appears
in the form of:
a) Temperature
b) Friction
c) Potential
energy d) Heat
47.Ice becomes slippery when man walks on
it because:
a) There is
no friction
b) Increase of pressure causes it to melt
c) Ice surface is
smooth d) It is very cold
48.A thermometer made by bonding together
two dissimilar metals having different thermal expansivity is called:
a) A liquid
thermometer
b) A resistance thermometer
c) A maximum
& minimum thermometer d) A bimetallic thermometer
49.Bimetallic thermometer is used:
a) In
automobiles for the automatic choke
b) In thermostats for refrigerator
c) As an oven
thermometer d) All of these
50.The amount of heat needed to raise the
temperature of body through 1 Ko is called:
a) Heat
capacity
b) Specific heat
c) Calorie d) Heat of fusion
51.The amount of heat energy required to
raise temperature of 1 Kg of substance through 1 K is called:
a) Heat
capacity
b) Specific heat
c) Molar heat
capacity d) Heat of vaporization
52.The relation between heat capacity and
specific heat is:
a) Heat
capacity = specific heat/mass
b) Heat capacity = specific heat mass
c) Heat capacity
= specific heat – mass d) None of these
53.The amount of heat needed to raise the
temperature of 1 gram of water through 1 Co is called:
a) Joule
b) Calorie
c) Kilo Calorie d) B.T.U.
54.The amount of heat needed to raise the
temperature of 1 kg of water through 1 K is called:
a) Calorie
b) Kilo Calorie
c) Joule d) None of these
55.The heat capacity per unit mass of a
body is called:
a) Heat of
fusion
b) Latent heat
c) Specific heat d) Calorie
56.Heat needed to melt 1kg of ice at its
melting point without change of temperature is called:
a) Heat
capacity
b) Heat of vaporization
c) Specific heat d) Latent heat of fusion of ice
57.The quantity of heat needed to raise
the temperature of 1 mole of a substance through 1Ko is called:
a) Specific
heat
b) Molar heat capacity
c) Heat capacity d) Joule
58.For a monoatomic gas, if Cp and Cv
represent specific heats at constant pressure and at constant volume respectively, then:
a) Cp < Cv
b) Cp = Cv
c) Cp > Cv d) None of these
59.SI units of specific heat are:
a) J Kg/K
b) J/Kg K
c) Cal/Kg K d) K Cal/Kg C
60.The product of specific heat of a
calorimeter and its mass is called:
a) Latent
heat
b) Coefficient of heat exchange
c) Water
equivalent d) None of these
61.The difference between Cp and Cv is
equal to:
a) One
Calorie
b) Boltzmann constant
c) Universal gas
constant d) Zero
62.The ratio Cp/Cv for a diatomic gas
like air is:
a) 1.40
b) 1.30
c) 1.50 d) 1.67
63.The ratio Cp/Cv for a monoatomic gas
like air is:
a) 1.30
b) 1.40
c) 1.52 d) 1.67
64.Suppose heat is added to a mixture of
ice and water at 0 C° until all the ice is melted. During the melting process the temperature of the
mixture:
a) Increases
b) Decreases
c) Remains the
same d) Decreases first and then increases
65.A system in which there is no transfer
of mass and energy across the boundary is called:
a) A closed
system
b) An isolated system
c) An open system d) None of these
66.The rate of cooling of a body depends
on:
a) The nature
of the body
b) The size of the body
c) The difference
in temperature between the body and its surroundings d) None of the above
67.The first law of thermodynamics is
merely a statement of:
a) Law of
conservation of momentum
b) Law of conservation of mass
c) Law of
conservation of energy d) Charles law
68.In SI units, Joule is the unit of:
a) Heat
energy
b) Change in internal energy
c) Work done
d) All of these
69.The process in which the temperature
of the system remains constant is called:
a) Adiabatic
process
b) Isothermal process
c) Isochoric
process
d) Isobaric process
70.In which of the following processes no
heat enters or leaves the system:
a) Isothermal
process
b) Isobaric process
c) Isochoric
process
d) Adiabatic process
71.The process in which the Pressure of
the system remains constant is called:
a) Isobaric
process
b) Adiabatic process
c) Isochoric
process
d) Isothermal process
72.In an adiabatic process
a) Work done
is positive
b) Work is done at the cost of internal energy
c) No work is
done
d) Neither of these
73.On a hot day or in hot climates white
clothes are worn because they are good:
a) Emitters
b) Absorbers
c) Reflectors
d) Radiators
74.In an isothermal process, the internal
energy of the system:
a) Increases
b) Decreases
c) Remains
constant
d) None of these
75.Which one of the following is the
example of irreversible process:
a) Peltier
effect
b) Work done against friction
c) Melting of ice
d) Isothermal process
76.Which one of the following is the
example of reversible process:
a) Heat
produced by current
b) Melting of ice
c) Work done
against friction
d) None of these
77.If the temperature of the source
increase, the efficiency of the Carnot engine:
a) Increases
b) Decreases
c) Remains
constant d) None of these'
78.If the temperature of the sink is
decreased, the efficiency of a carnot engine:
a) Decreases
b) Increases
c) Remains
constant d) Becomes zero
79.Which property of a system remains
constant during adiabatic change:
a) Pressure
b) Temperature
c) Internal
energy d) Entropy
80.The efficiency of a carnot engine
depends on:
a) The
temperature of the source only
b) The temperature of the sink only
c) Both
temperature of source and sink d) The working substance
ANSWER KEY
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41
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51
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61
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71
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42
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52
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62
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72
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43
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53
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63
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73
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44
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54
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64
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74
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45
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55
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65
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75
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46
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56
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66
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76
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47
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57
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67
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77
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48
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58
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68
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78
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49
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59
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69
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79
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50
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60
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70
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80
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