PPSC Physics Full Book With Answers

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PPSC Physics Full Book

Sr. # Questions Answers Choice
1 Which of the following is the ideal gas equation. PV -n RT P/V = n RT V/P = nR/T PV = T/nR
2 Which of the following is heat transfer by means of the emission or absorption of electromagnetic radiation such as sunshine. Conduction or diffusion Convection Radiation Mass transfer
3 Which is the heat transfer mode between an object and its environment due to circular fluid motion. Conduction Convection Radiation Mass transfer
4 The transfer of thermal energy between regions of matter due to a temperature gradient is called. Conduction Radiation Convection Sublimation
5 The temperature of 1 kg of hydrogen gas is the same as that of 1 kg of helium gas if. The gases have the same internal energy The gas molecules occupy equal volumes The gas molecules have the same root mean square speed The gas molecules have same mean translational K.E.
6 The temperature of a certain substance in Celsius scale of temperature is 800 oC in Kelvin scale it is. 173 K 931 K 1073 K 1193 K
7 The SI unit of heat capacity is. kg J Kg J-1 J K-1 Kg J-1 K-1
8 One calorie equals to 1.2 J 2.2 J 3.2 J 4.2 J
9 Which of the following is defined as the amount of heat required to raise the temperature of 1 g of water by 1 oC Joule BTO Electron volt Calorie
10 Which law states that if two systems are in thermal equilibrium with a third system they are also in the thermal equilibrium with each other. Third law of thermodynamics Second law of thermodynamics First law of thermodynamics Zeroth law of thermodynamics
11 Which of the following is the science of measuring the heat of chemical reactions or physical changes. Thermometry Calorimetry Telemetry Photometry
12 An inflated tyre suddenly bursts As a result of this temperature of the surrounding Increases Descreases Remains constant May increase or decrease
13 The actual gas can behave like an ideal gas at Low density and high pressure High density and high pressure Low density and low pressure High density and low pressure
14 A perfect gas is one whose Molecules are masless Molecules are energetic Molecules are perfectly elastic Molecules are at rest
15 The door of an operating refrigerator in a closed room is opened after sometime the temperature of the room will be Lowered Raised Unaffected Become zero
16 Thermodynamics deals with Isolated systems The interactions among various parts of the system The microscopic behavior of a system The interactions between system and surrounding
17 The volume of a goas at constant pressure is directly proportional to the temperature as measured on the. Celsius scale Kelvin scale Fahrenheit scale Baume scale
18 From any substance the temperature and pressure at which the material can coexist in all three states in equilibrium is called. Critical point Triple point Initial point Final point
19 In which temperature range water decreases in volume with increasing temperature. From 0 <sup>o</sup>C to 4 <sup>o</sup>C from 0 <sup>o</sup>C to 10 <sup>o</sup>C from 50 <sup>o</sup>C to 100 <sup>o</sup>C from 75 <sup>o</sup>C to 100 <sup>o</sup>C
20 Which of the following is a thermodynamic temperature scale. Celsius scale Fahrenheit scale Kelvin scale Rankine scale
21 What is the SI unit for thermal conductivity. W m-1 K-1 W m-2 k-2 W m-3 k-1 J kg -1 k-1
22 What is the heat required in Kilo joules when the temperature of 100 g of copper is raised thgough 20 K/. Specific heat capacity of copper is 0.4 x 10-3 kg -1 k-1 0.4 kj 0.8 kj 400 kj 800 kj
23 Which temperature is the absolute measure of temperature. Thermodynamic temperature Freezing point Boiling point Absolute zero
24 The Fahrenheit and Kelvin scales intersect at 40 -40 140 -140
25 On which temperature scale a degree is 1/180 of the interval between the freezing point and the boiling point. Celsius scale Fahrenheit scales Rankine scale Kelvin scale
26 Real gases obey gas laws only at Low pressure and high temperature High pressure and low temperature High pressure and high temperature Low pressure and low temperature
27 If volume of the gas doubled without changing its temperature the pressure of the gas is Reduced to half of original value Not changed Reduced to one fourth of original value Doubled
28 The efficiency of a diesel engine is about 15% to 35 5 355 to 40% 45% to 655 505 to 65 %
29 Efficiency of a Carnot engine can never be 1 or 100% unless cold reservoir is at absolute temperature. 0 K 100 K 273 K 373 K
30 Efficiency of a Carnot engine depends on Temperature Pressure Volume The nature of working substance
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