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 The specific heat of liquid Decreases with temperature Increases with temperature Remains constant with change in temperature Increases with pressure
2 The product of mass and specific heat of a substance is called. Latent heat Water equivalent Atomic heat Heat capacity
3 What makes the air coming out of a punctured tyre cool. Isothermal expansion Adiabatic expension Flow at high speed Atmospheric pressure
4 How solid hydrogen is obtained. By cascade process By joule kelvin effect By adiabatic expansion Lowering temperature below melting point
5 In four stroke cycle the crank makes One complete revolution Two complete revolutions three complete revolutions Four complete reveolutions
6 Which of the given geometries will result in the largest convection consfficient. Vertical plate Diagonal plate horizontal plate facing upwards Horizontal plate facing downwards
7 When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone. An increase in pressure An increase in temperature A change in phase A change in entropy
8 Andrews isothermal helps to messure Boiling point Boyle's temperature Temperature of inversion Critical temperature
9 The ration of Universal gas constant and Avogadro's number is called. Equilibrium constant Velocity constant Boitzmann's constant Gravitational constant
10 The efficiency of Carnot engine is Less than one Zero Greeter than one Infinite
11 Law of increase of entropy is a result of First law of thermodynamics Second law of thermodynamics Third law of thermodynamics Zeroth law of thermodynamics
12 Net change in entropy of a system in a Carnot's cycle in Positive Negative Zero Infinite
13 When the temperature of source and sink of a heat engine become equal the entropy change will be. Zero Maximum Minimum Negative
14 No entropy change is associated with Isothermal process Adiabatic process Isochoric process Isoteric process
15 If temperature of the sink is decreased the efficiency of a Carnot engine Increases Decreases Remains constant First increases and thend ecreases
16 An ideal engine can be 100% efficient only if its exhaust temperatute. Equal to input temperature Less than is input temperature More than its input temperature 0 <sup>o</sup>C
17 The specific heat of a substance is a function of its mass Weight Volume <div>Molecular structure</div>
18 The specific heat of all gases increases with temperature at high temperature decreases at low temperature expectation is Oxygen gas Nitrogen gas Mono atomic gas Dia atomic gas
19 In ideal gas equation PV = nRT , R is Universal gas constant Avogadro's number Plank's constant Gravitational constant
20 Which gas strictly obeys gas laws. Hydrogen gas Inert gas Ideal perfect gas Helium gas
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