PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 Andrews isothermal helps to messure Boiling point Boyle's temperature Temperature of inversion Critical temperature
2 The ration of Universal gas constant and Avogadro's number is called. Equilibrium constant Velocity constant Boitzmann's constant Gravitational constant
3 The efficiency of Carnot engine is Less than one Zero Greeter than one Infinite
4 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
5 Net change in entropy of a system in a Carnot's cycle in Positive Negative Zero Infinite
6 When the temperature of source and sink of a heat engine become equal the entropy change will be. Zero Maximum Minimum Negative
7 No entropy change is associated with Isothermal process Adiabatic process Isochoric process Isoteric process
8 If temperature of the sink is decreased the efficiency of a Carnot engine Increases Decreases Remains constant First increases and thend ecreases
9 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
10 The specific heat of a substance is a function of its mass Weight Volume <div>Molecular structure</div>
11 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
12 In ideal gas equation PV = nRT , R is Universal gas constant Avogadro's number Plank's constant Gravitational constant
13 Which gas strictly obeys gas laws. Hydrogen gas Inert gas Ideal perfect gas Helium gas
14 The pressure necessary to liquify a gas at the critical temperature is called. Normal pressure Atmospheric pressure Critical pressure Liquid pressure
15 Absolute zero may be regarded as the temperature of which Water freezes All substances are solids All gases become liquids Molecular motioning a gas would ceases
16 Certain gas are called permanent gases because. They cannot be liquified They are perfect gases The critical temperatures are low their boiling points are low
17 What is the mean free path in a gas. The distance travelled by a molecule before hitting a wall the average distance travelled by a molecule in one second the average distance travelled by molecules in one second The root mean square velocity
18 Which one of the following is an example of a reversible process. Work done against friction Heat produced by current Melting of ice See back effect
19 Which of the following is an example of an irreversible process. Isothermal and adiabatic process Melting of ice Work done against friction Pettier effect
20 Temperature of a system remains constant in Adiabatic process Isobaric process Isothermal process Isochoric process
21 The process is which volume of the system remains constant. Isobaric process Isochoric process Isothermal process Adiatatic process
22 The process in which pressure of the system remains constant. Isothermal process Isochoric process Isobaric process Adiabatic process
23 The ration Cv/Cp = y for a diatomic gas like air is 1.29 1.30 1.40 1.67
24 Difference between Cp and Cv is equal to General gas constant Planck's conatant Molar gas constant Boltzmann's constant
25 Which kind of motion is exhibited by molecules of monoatomic gas. Rotatory Vibratory Translatory Random
26 A fixed mass of an ideal gas absorbs 1000 J of heat and expands under a constant pressure of 20 kPa from a volume of 25 x 10-3 m3 to a volume 50 x 10-3 The change internal energy of the gas is. 500 J 1000 J -1000 J Zero
27 What is the average K.E. of gas molecules at temperature equal to K. kt/3 3/2 KT 1/2 KT 2/3 KT
28 Temperature of a gas is related to. Total K.E. of the gas molecules The K.E. of the centre of mass of the gas The P.E. of the centre of mass of the gas Total K.E. of the molecules w.r.t the centre of mass of gas
29 Mean free path of gas molecules is inversely proportional to its. Volume Pressure Temperature Weight
30 Gases exert pressure on walls of the vessels because gas molecules. Possess momentum Have finite volume Collide with each other Obey gas laws
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