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
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
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
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
474. Sublimation curve on p-t diagram for all substances possesses the following slope
A.Zero
B.Infinity
C.Positive
D.Negative
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
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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