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Question-1
R.M.S velocity of a molecule is C at pressure P. If pressure is increased two times, then r.m.s velocity becomes
(A)
0.5 C
(B)
C
(C)
2 C
(D)
3 C
Question-2
A container has N molecules at absolute temperature T. If the number of molecules is doubled but kinetic energy in the box remains the same, the absolute temperature of the gas is:
(A)
T
(B)
2 T
(C)
T
/
2
(D)
Zero
Question-3
The temperature of H
2
at which the r.m.s. velocity of its molecules is seven times the r.m.s. velocity of the molecules of nitrogen at 300 K will be:
(A)
2500 K
(B)
1800 K
(C)
1850 K
(D)
1050 K
Question-4
A piston of cross-section area A is fitted in cylinder in which gas of volume V at pressure P is enclosed. Gas obeys Boyle's law, the angular frequency if piston is displaced slightly, is :
(A)
(B)
(C)
(D)
Question-5
The speeds of 5 molecules of a gas (in arbitrary units) are 2,3,4,5,6.The root mean square speed for these molecules is:
(A)
2.91
(B)
3.52
(C)
4.00
(D)
4.24
Question-6
Which one of the following graphs represents the behaviour of an ideal gas ?
(A)
(B)
(C)
(D)
Question-7
A given amount of gas at 20
o
C has a pressure P. The temperature at which the pressure will be 2 P (at constant volume) is approximately
(A)
113
o
C
(B)
40
o
C
(C)
213
o
C
(D)
313
o
C
Question-8
Pressure as is increased by keeping constant. What is the effect on kinetic energy of molecules ?
(A)
Increase
(B)
Decrease
(C)
No change
(D)
Can't be determined
Question-9
The average kinetic energy of a gas molecule at 27
o
C is 6.21 x 10
-21
J. Its average kinetic energy at 227
o
C will be
(A)
(B)
(C)
(D)
Question-10
What is the absolute mass of an atom of oxygen? Atomic mass of oxygen is 16 and Avogadro's number =
(A)
(B)
(C)
(D)
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Plus 1 Computer Science
CBSE
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