Heat and Thermodynamics MCQs
Multiple choice questions.
1.)The pressure exerted by the gas is _______ to the average translational kinetic energy of the gas molecules.
a) directly proportional.
b) inversely proportional
c) equal.
d) ½ times equals
Ans : a) directly proportional
2.) The equal of Ideal gas can be expressed as PV = _______
a)n/RT.
b) nRT
c) n²RT.
d) nR/T
Ans : b) nRT
3.) The value of universal gay constant is
a)8.314 Jmolk.
b) 8.314 J-1mol-1k-1
c) 8.314Jmol-1k-1.
d) 8.314 Jmolk-1
Ans : c) 8.314 Jmol-1k-1
4.) The SI unit of universal gas constant is
a) Jmolk.
b) J-1mol-1k-1
c) Jmol-1k-1.
d) Jmolk-1
Ans : c) Jmol-1k-1
5.) Absolute temperature of an ideal gas is _______ to the average translational kinetic energy of gas molecules.
a) directly proportional.
b) inversely proportional
c) equal.
d) ½ times equals
Ans : a) directly proportional
6) The pressure P is inversely proportional to volume V at constant temperature of the gas which is.
a) Boyle’s law.
b) Charles law
c) Newton’s law.
d) Planck’s law
Ans : a) Boyle’s law
7.) According to Boyle’s law pressure is _______ to volume at constant temperature of the gas.
a) directly proportional. b) inversely proportional
c) equal. d) ½ times equals
Ans : b) inversely proportional
8.) According to Boyle’s law, pressure P ∝ ___
a)V.
b) 1/V
c) T. d) 1/T
Ans : b) 1/V
9.) The volume is directly proportional to absolute temperature of the gas provided pressure is kept constant, it is,
a) Boyle’s law. b) Charles law
c) Newton’s law. d) Planck’s law
Ans : b) Charles law
10.) According to Charles law, volume is _______ to absolute temperature of the gas provided pressure is kept constant.
a) directly proportional. b) inversely proportional
c) equal. d) ½ times equals
Ans : a) directly proportional
11.) According to Charles law, volume V ∝ ______
a)V.
b) 1/V
c) T.
d) 1/T
Ans : c) T
12.) According to first law of thermodynamics heat Q = _____
a)∆U+W.
b) ∆U-W
c) U+∆W.
d) U-∆W
Ans : a) ∆U+W
13.) An ______ process is the one which no heat enters or leaves the system.
a) isothermal.
b) Adiabatic
c) rapid escape.
d) cloud formation
Ans : b) Adiabatic
14) The rapid escape of air from a burst tyre it is an
a) isothermal process
b) Adiabatic process
c) global process.
d) cloud formation process
Ans : b) Adiabatic process
15.) Cp is constant pressure and Cv be the constant volume R is universal gas constant then, R _______
a) Cp – Cv
b) Cp + Cv
c) Cv – Cp
d) Cv + Cp
Ans : a) Cp – Cv
16.) A succession of events which bring the system back to its initial condition is called a,
a) circle.
b) cycle
c) cylinder.
d) solar
Ans : b) cycle
17.) A reversible cycle is the one in which all the changes are ________
a) irreversible.
b) reverseble
c) equal.
d) constant
Ans : b) reverseble
18.) If a process can not be retraced in the backward direction by reversing the controlling factors, it is an _______ process.
a) irreversible.
b) reverseble
c) equal.
d) constant
Ans : a) irreverseble
19.) If a system undergoes a natural process, it will go in the direction that causes the _______ of the system plus the environment to increase.
a) diesel engine.
b) petrol engine
c) entropy.
d) cycle
Ans : c) entropy
20.) Energy is conserved it means it is an,
a) First law of thermodynamics
b) Second law of thermodynamics
c) First law of motion
d) Second law of motion
Ans : a) First law of thermodynamics
21.) From the kinetic theory of gases, P = _____ ρ <v²>
a) ½.
b)⅓
c) ¼.
d) π
Ans : b) ⅓
22) The sum of all forms of molecular energy present in a thermodynamics system is called,
a) internal energy.
b) external energy
c) thermodynamic energy.
d) molecular energy
Ans : a) internal energy
23.) The process in which Boyle’s law holds good , which is
a) molecular process.
b) isothermal process
c) rapid escape.
d) volumetric
Ans : b) isothermal process
24.) Molar specific heat at constant volume is the amount of heat required to rise the temperature of one mole of gas through 1K keeping ________ constant
a) pressure.
b) temperature
c) volume.
d) distance
Ans : c) volume
25.) Molar specific heat at constant pressure is the amount to heat required to raise the temperature of one mole of gas through 1K keeping ______ constant.
a) pressure.
b) temperature
c) volume.
d) distance
Ans : a) pressure
26.) A device which converts a part of thermal energy into useful work, is called
a) converte engine.
b) solar engine
c) heat engine.
d) thermal energy
Ans : c) heat energy
27.) Efficiency of carnot engine can be expressed as,
a) 1-(T1/T2).
b) 1-(T2/T1)
c) (T1/T2)-1.
d)(T2/T1)-1
Ans : b) 1-(T2/T1)
28.) There is no perpetual motion machine that can convert the given amount of heat completely in work, it is an
a) First law of thermodynamics
b) Second law of thermodynamics
c) First law of motion
d) Second law of motion
Ans : b) Second law of thermodynamics
29.) The total entropy of any system plus that of its environment increases as a result of any natural process, it is an
a) First law of thermodynamics
b) Second law of thermodynamics
c) First law of motion
d) Second law of motion
Ans : b) Second law of thermodynamics
30.) Entropy change ∆S due to heat transfer ∆Q at absolute temperature T is given by , ∆S = ± _______
a)∆Q/T².
b)∆Q/T
c) ∆Q/2T.
d) ∆Q²/T
Ans : b) ∆Q/T
31.) ______ pollution is an inevitable consequence of second law of thermodynamics.
a) Machanic.
b) Chemical
c) Thermal.
d) Solar
Ans : c) Thermal
32.) Change in entropy is _________ when heat is added in the system.
a) positive.
b) nagetive
c) neutral.
d) zero
Ans : a) positive
33.) Change in entropy is _______ when heat is removed from the system.
a) positive.
b) nagetive
c) neutral.
d) zero
Ans : b) nagetive
34.) All natural process where heat flows from one system to another, there is always a net increase in entropy. This is an statement related to
a) First law of thermodynamics
b) Second law of thermodynamics
c) First law of motion
d) Second law of motion
Ans : b) Second law of thermodynamics