Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics Online Test With Answers

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Physics ECAT Pre Engineering Chapter 11 Heat & Thermodynamics Online Test

Sr. # Questions Answers Choice
1 The value of E0in coulomb's law is: 9 x 10<sup>9</sup>Nm<sup>2</sup>C<sup>-2</sup> 8.85 x 10<sup>-12</sup>C<sup>2</sup>N<sup>-1</sup>m<sup>-2</sup> 8.85 x 10<sup>-12</sup>Nm<sup>2</sup>C<sup>-2</sup> 9 x 10<sup>9</sup>C<sup>2</sup>N<sup>-1</sup>m<sup>-2</sup>
2 If the distance between two charges is doubled, the force between them will become: Double Half Three times One fourth One third
3 Average KE of a gas molecule has: Direct relation with absolute temperature and inverse relation with pressure Direction relation with both absolute temperature and pressure Inverse relation with both absolute temperature and pressure None of these
4 Gas constant per molecule is called: Universal gas constant Stefen's constant Boltzmann constant Gravitation constant
5 Tick the correct pair when M denotes the molecular mass and other symbols carry usual meanings: N = nN<sub>A</sub>m = MN<sub>A</sub> n = N N<sub>A</sub>, M = mN<sub>A</sub> M = N<sub>A</sub>/N , N<sub>A</sub>= m/n N = nN<sub>A</sub>, M = mN<sub>A</sub>
6 In the formula P = N0KT, N0denotes: Number of molecules per unit per volume Number of moles Number of molecules None of these
7 The volume of universal gas constant R is: 8.314 J/K mole K 8314 J/K mole K 8.314 J/mole K None of these
8 If the formula PV = nRT, n denotes: Number of molecules per unit volume Number of moles Number of molecules None of these
9 While deriving equation of pressure by kinetic theory of gases, we take into account: Only linear motion of molecules Only rotational motion Only vibratory motion All of these
10 Pressure applied at any point of gas at rest is transmitted equally to all parts of the gas. This is the statement of: Newton's second law Pascal's law Carnot theorem Second law of thermodynamics
11 If denotes the total number of molecules in cubic vessel such that m is mass of each milecule and I is length of each side of vessel, then mN/I3gives the: Force Density Work done Pressure
12 The rate of change of momentum of a molecule is equal to: Pressure Work Density Force
13 If a molecule with momentum mv strikes a wall and rebound then the change in momentum will be: -2 mv Zero 2 mv mv
14 Pressure may be define as _______ per second per unit area: Change in force Change in momentum Change in energy Work done
15 Truth of kinetic energy is confirmed by: Diffusion of gases Brownian motion Both A and B None of these
16 Electromagnetic waves emitted by hot bodies are called: Photoelectrons Alpha rays Thermal radiation None of these
17 The nature of thermal radiation is similar to: Ultraviolet rays Light rays Both of them None of these
18 The relationship between Boltzmann constant k with R and NAis given as: k = RN<sub>A</sub> k =R/N<sub>A</sub> k = NR/N<sub>A</sub> None of these
19 At constant temperature, if the density of the gas is increased, its pressure will: One kg of a substance Unit volume of a substance One mole of a substance None of these
20 The motion of molecules in gases is: Orderly Random Circular All of these
21 In an ideal gas, the molecules have: Kinetic energy only Potential energy only Both KE and PE None of these
22 Which of the following does not have the same units: Work Heat Kinetic energy Power
23 The temperature scale approved in SI units is: Celsius scale Kelvin scale Fehrenheit scale None of these
24 In the theory of dimensional analysis, heat may be properly represented by: ML<sup>2</sup>T<sup>-2</sup> MT<sup>-2</sup> ML<sup>-1</sup>T<sup>-1</sup> None of these
25 The only significant motion possessed by the mono-atomic gas represented is: Translatory Rotatory Vibratory None of these
26 At the constant temperature, if the value of a given mass of a gas is double, then the density of gas becomes: Double Remains constant Half None of these
27 Real gases strictly obey gas law at: High pressure and low temperatures Low pressures and high temperatures High pressures and high temperatures None of these
28 A gas which strictly obeys the gas laws under all conditions of temperature and pressure is called: Ideal gas Inert gas Real gas None of these
29 When two objects come to common temperature, the body is said to be in: Static equilibrium Dynamic equilibrium Thermal equilibrium None of these
30 Absolute zero is considered as that temperature at which: All liquid become gases All gases become liquid Water freezes None of these
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