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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

All Topics  1919

The unit of length in S.I. units is________________?
A meter
B centimeter
C kilometer
D millimeter
Correct Answer: meter
According to Gay-Lussac law for a perfect gas, the absolute pressure of given mass varies directly as____________________?
A temperature
B absolute
C absolute temperature, if volume is kept constant
D volume, if temperature is kept constant
Correct Answer: temperature
General gas equation is____________________?
A PV=nRT
B PV=mRT
C PV=KiRT
D PV = C
Correct Answer: PV=mRT
Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits ?
A 02, N2, steam, C02
B Oz, N2, water vapour
C S02, NH3, C02, moisture
D 02, N2, H2, air
Correct Answer: 02, N2, H2, air
A closed system is one in which_________________________?
A mass does not cross boundaries of the system, though energy may do so
B mass crosses the boundary but not the energy
C neither mass nor energy crosses the boundaries of the system
D both energy and mass cross the boundaries of the system
Correct Answer: mass does not cross boundaries of the system, though energy may do so
According to kinetic theory of gases, the absolute zero temperature is attained when___________________?
A volume of the gas is zero
B pressure of the gas is zero
C kinetic energy of the molecules is zero
D specific heat of gas is zero
Correct Answer: kinetic energy of the molecules is zero
No liquid can exist as liquid at____________________?
A – 273 °K
B vacuum
C zero pressure
D centre of earth
Correct Answer: zero pressure
The pressure’of a gas in terms of its mean kinetic energy per unit volume E is equal to________________?
A E/3
B E/2
C 3E/4
D 2E/3
Correct Answer: E/3
The unit of power in S.I. units is_______________________?
A newton
B pascal
C erg
D watt
Correct Answer: watt
Superheated vapour behaves___________________?
A exactly as gas
B as steam
C as ordinary vapour
D approximately as a gas
Correct Answer: approximately as a gas
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