PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 The phenomenon of regular refraction of light illustrates taht. Light is reflected in one direction only Light is reflected through a range of different angles Light is refracted in one direction only Light is refracted through a range of different angles.
2 Shadow formation and the pin hole camera illustrate the Phenomenon of reflection Phenomenon of refraction Phenomenon of total internal reflection Rectilinear propagation of light
3 A part of electromagnetic spectrum that can be detected by the human aye Angle of incidence Angle of refraction Light Angle of reflection
4 Which of the following is a thermodynamic potential Internal energy Enthalpy Gibb's free energy All of these
5 Why an even Carnot engine Carnot give 100% efficiency. We cannot find ideal sources We cannot eliminate friction We cannot reach absolute zero temperature We cannot remove heat
6 Which of the following can be used visualize the third law thermodynamics Light Heat Water All of these
7 Because of second law of thermodynamics about the direction of energy flow what is possible. Heat Light Energy life
8 Internal energy of a gas decreased when It gains heat Change in cycle Change in adiatatic Change in reversible
9 Which of the following gases has the maximum rms speed at STP. O2 H2 N2 CO2
10 What kind of movement is dictated by the laws of thermodynamcis. Energy motion Heat work Light heat Energy light
11 How does heat transfer between objects. From cold to hot objects From hot to cold objects By electromagnetic radiations From hotter to hottest objects.
12 How do solar heat and light reach the Earth. By radiation By convection By conduction By conduction and convection
13 When the temperature of a body is equal to that of the surrounding then the body appears Dull black Red hot In thermal equilibrium To be cold
14 If the pressure of a gas is doubled, then its thermal conductivity will Increases Decreases Remain constant Be zero
15 The zero point of Kelvin scale is called. Critical point Terminal point Absolute zero Mid point
16 What is the total entropy change during an reversible cycle. Unity Infinite Zero Cannot be detected
17 When all the systems taking part in a process are included, the entropy. Decreases Either remains constant of increases Either remains constant or decreases Remains constnat
18 What is a measure of the total energy of a thermodynamics system. Entropy Enthalpy Randomness Chaos theory
19 Which quantity provides a quantitative measure of disorder. Entropy Enthalpy Randomness Chaos
20 Triple point of water in Kelvin scale is 0 K 100 K 273 .15 K 373.15 K
21 If we place oure hand below a lighted lamp we feel warmer due to. Conduction Convection Radiation None of these
22 If two gases have same reduced pressure volume and temperature it is according to Boyle's law Charles law Law of corresponding state Zeroth law
23 Advantage of using gases as thermornetic substrates is taht Gases have a small coefficient of expansion Expansion of gases is irregular Gases can be obtained in pure form Gases have a large coefficient of expansion.
24 The specific heat of liquid Decreases with temperature Increases with temperature Remains constant with change in temperature Increases with pressure
25 The product of mass and specific heat of a substance is called. Latent heat Water equivalent Atomic heat Heat capacity
26 What makes the air coming out of a punctured tyre cool. Isothermal expansion Adiabatic expension Flow at high speed Atmospheric pressure
27 How solid hydrogen is obtained. By cascade process By joule kelvin effect By adiabatic expansion Lowering temperature below melting point
28 In four stroke cycle the crank makes One complete revolution Two complete revolutions three complete revolutions Four complete reveolutions
29 Which of the given geometries will result in the largest convection consfficient. Vertical plate Diagonal plate horizontal plate facing upwards Horizontal plate facing downwards
30 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
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