PPSC Physics Chapter 3 Thermal Properties of Matter With Answers

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PPSC Physics Chapter 3 Thermal Properties of Matter

Sr. # Questions Answers Choice
1 A heat engine can develop efficiency equal to 100% if the temperature of the sink is Less than that of source Equal to that of source 0 K 0 <sup>o</sup>C
2 The amount of heat needed per unit mass to raise the temperature of a system one degree at constant pressure is numerically aqual to The specific heat The specific thermal energy The specific heat at constant pressure the internal energy of the gas
3 Entropy of universe is increasing day by da due to. Power generating processes Energy used into work Depletion of ozone All of the above
4 Which of the following has negative specific heat Ne CO2 O2 Sturated vapours
5 Why freezer a refrigerator is located in the top section Motor is not affected Heat gained from environment is less The entire chamber of freezer is cooled quickly Heat gained from environment is more
6 The total gain in entropy of the working substance in a Carnot cycle is. Positive Negative Infinite Constant
7 What is the amount of mechanical work done to melt 1 g of ic completely 4.2 J 42 J 80 J 336 J
8 First law of thermodynamics is a Boyle 's law Charles' law Law of energy conservation Steffen Boltzmann law
9 Mean free path of gas molecules is inversely proportional to its Volume Pressure Temperature Size
10 Gas law PV = constant is for Adiabatic change Isothermal changes Isobaric changes Isochoric changes
11 In the free expansion of a perfect gas there is no. work done Heat exchnged Internal energy changed All of the above
12 Identify the irreversible process Explosion of a bomb Slow expansion of a gas Slow compression of a gas Slow compression of an eleastic spring
13 In an isobaric process there is no. Pressure change Internal energy change Heat exchanged volume change or work done
14 The thermal inertia of a thermodynamic system is known as its. Entropy Enthalpy Isothermal conduction Adiabatic conduction
15 In Isochoric process there is no Work done Internal energy change Volume change or work done Heat exchanged
16 Significant motion for the molecules of a monoatomic gas is. Rotatory Vibratory Translatory Random
17 Which one of the following gases posses maximum oot mean square velocity. Hydrogen Oxygen Nitrogen Carbon dioxide
18 If the pressure in a closed vessel is reduced by drawing some gas the mean free path of the gas molecules. Decreases Remains constant Increases First increases then decreases
19 if temperature eon Celsius scale is 50 oC the temperature on Fahrenheit scale will be. 102 <sup>o</sup>F 108 <sup>o</sup>F 112 <sup>o</sup>F 122 <sup>o</sup>F
20 A given quantity of an ideal gas is at pressure P and temperature T What is the isothermal bulk modulus of the gas. 2/3 P P 2P 3/2 P
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