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Mechanical Engineering Objective Questions { Thermodynamics }



470. R.M.S velocity of hydrogen gas at N.T.P. is
A.189 m/sec
B.1839 m/sec
C.932 m/sec
D.1356 m/sec
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471. Molecule is defined as the
A.Substance which has not been resolved into simpler form
B.Element made up of minute and chemically indivisible particles
C.Smallest quantity of a substance which can exist by itself in chemically recognized form
D.Indivisible particle
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472. Atom is defined as the
A.Substance which has not been resolved into simpler form
B.Element made up of minute and chemically indivisible particles
C.Smallest quantity of a substance which can exist by itself in chemically recognized form
D.Lightest substance
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473. During a process on the closed system, its internal energy increases by twice the units than the heat added to it. It is possible due to
A.Radiation of heat from surroundings
B.Lowering of the temperature
C.Increasing of temperature
D.Performing of shaft work on the system
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474. Sublimation curve on p-t diagram for all substances possesses the following slope
A.Zero
B.Infinity
C.Positive
D.Negative
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475. Sublimation is the process of
A.Changing from solid state to direct gas state
B.Changing from gas state to direct solid state
C.Existence of liquid and gases together
D.Existence of solid, liquid and gas simultaneously
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476. The process of sublimation is found to occur in the case of
A.Liquid nitrogen
B.Solid CO2
C.Solid O2
D.Steel
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