Who is the best physics teacher in Ranchi?

बुद्धा साइन्स एंड टेक्निकल इंस्टीट्यूट
Buddha Science & Technical Institute
Kokar, Ranchi, Jharkhand
JOIN BSTI FOR : IIT-JEE / NEET With BHARAT SIR
PHYSICS : IMPORTANT QUESTION FOR IIT-JEE / NEET
Q. A vessel contains 1 mole of O2 gas (relative molar mass 32) at a
temperature T. The pressure of the gas is P. An identical vessel
containing one mole of He gas (relative molar mass 4) at a
temperature 2T has a pressure of
A. P / 8 B. P
C. 2 P D. 8 P
ANS : C
V.V.I.
QUESTION

Q. A gas mixture consists of 2 moles of oxygen and 4 moles of argon at
temperature T. Neglecting all vibrational modes, the total internal
energy of the system is
A. 4RT B. 9RT
C. 11RT D. 15RT
ANS : C
V.V.I.
QUESTION

Q. An ideal gas is expanding such that PT2 = constant. The coefficient
of volume expansion of the gas is
A. 1 / T
B. 2 / T
C. 3 / T
D. 4 / T
ANS : C
V.V.I.
QUESTION

Q. A real gas behaves like an ideal gas if its
A. Pressure and temperature are both high
B. Pressure is high and temperature is low
C. Pressure and temperature are both low
D. Pressure is low and temperature is high
ANS : D
V.V.I.
QUESTION

Q. At room temperature, the r.m.s. speed of the molecules of a certain
diatomic gas is found to be 1,920 ms-1. The gas is
A. H2
B. F2
C. O2
D. Cl2
ANS : A
V.V.I.
QUESTION

Q. Cooking gas containers are kept in a lorry moving with uniform
speed. The temperature of the gas molecules inside will
A. Increase
B. Decrease
C. Remain the same
D. Decreases for same, while increases for others
ANS : C
V.V.I.
QUESTION

Q. The work of 146 kJ is performed in order to compress one
kilomole of a gas adiabatically and in this process the temperature
of the gas increases by 7˚C. The gas is
A. A mixture of mono atomic and diamtomic B. Mono atomic
C. Diatomic D. Triatomic
ANS : C
V.V.I.
QUESTION

Q. An absolute zero is the temperature at which
A. Water solidifies
B. All gases become liquid
C. rms velocity become zero
D. None of the above
ANS : C
V.V.I.
QUESTION

Q. At boyle`s temperature
A. Joule`s effect is positive
B. B of van der Waals` equation is zero
C. Gas obeys boyle`s law
D. None of the above
ANS : C
V.V.I.
QUESTION

Q. The degree of freedom in case of an mono atomic gas is
A. 1
B. 3
C. 5
D. None of above
ANS : B
V.V.I.
QUESTION

Q. Two gases are at absolute temperatures 300 K and 350 K
respectively. Ratio of average kinetic energy of their molecules is
A. 7 : 6
B. 6 : 7
C. 36 : 49
D. 49 : 36
ANS : B
V.V.I.
QUESTION

Q. For Boyle`s law to hold good, the gas should be
A. Perfect and of constant mass and temperature
B. Real and of constant mass and temperature
C. Perfect and at constant temperature but variable mass
D. Real and at constant temperature but variable mass
ANS : A
V.V.I.
QUESTION

Q. A gas behaves as an ideal gas at
A. Low pressure and high temperature
B. Low pressure and low temperature
C. High pressure and low temperature
D. High pressure and high temperature
ANS : A
V.V.I.
QUESTION

Q. In kinetic theory of gas a molecule of mass m of an ideal gas
collides with a wall of vessel with velocity v. The change in the
linear momentum of the molecule is
A. 2mv B. mv
C. -mv D. Zero
ANS : A
V.V.I.
QUESTION

Q. The temperature of a gas is held constant, while its volume is
decreased. The pressure exerted by the gas on the walls of the
container increases, because its molecules
A. Strike the walls with higher velocities
B. Strike the walls with large force
C. Strike the walls more frequently
D. Are in contact with the walls for a shorter time
ANS : C
V.V.I.
QUESTION

Q. The absolute zero is the temperature, at which
A. All substances exist in solid state
B. Water freezes
C. Molecular motion ceases
D. None of these
ANS : C
V.V.I.
QUESTION

Q. At constant volume temperature is increased, then
A. Collisions on walls will be less
B. Number of collisions per unit time will increase
C. Collisions will be in straight lines
D. Collisions will not change
ANS : B
V.V.I.
QUESTION

Q. The relation PV = RT can describe behaviour of a real gas at
A. High temperature and high density
B. High temperature and low density
C. low temperature and low density
D. Low temperature and high density
ANS : B
V.V.I.
QUESTION

Q. At 0 K, which of the following properties of a gas will be zero ?
A. Kinetic energy
B. Potential energy
C. Vibrational energy
D. Density
ANS : A
V.V.I.
QUESTION

Q. An ant is walking on the horizontal surface. The number of degrees
of freedom of ant will be
A. 1
B. 2
C. 3
D. 6
ANS : B
V.V.I.
QUESTION

Q. The number of degrees of freedom for a diatomic gas molecule is
A. 2
B. 3
C. 5
D. 6
ANS : C
V.V.I.
QUESTION

Q. The degree of freedom of a triatomic gas is
A. 1
B. 2
C. 6
D. 8
ANS : C
V.V.I.
QUESTION

Q. Temperature of oxygen kept in a vessel is raised by 1˚C at constant
volume. Heat supplied to the gas may be taken partly as
translational and partly rotational kinetic energies. Their
respective shares are
A. 60%, 40% B. 50%, 50%
C. 100%, zero D. 40%, 60%
ANS : A
V.V.I.
QUESTION

Q. Gas exerts pressure on the walls of the container because
A. Gas has weight
B. Gas molecules have momentum
C. Gas molecules collide with each other
D. Gas molecules collide with the walls of the container
ANS : D
V.V.I.
QUESTION

Q. Two gases A and B having same pressure P, volume V and
temperature T are mixed. If mixture has volume and temperature
as V and T respectively, then pressure of mixture is
A. P B. 3 P
C. 2 P D. 4 P
ANS : C
V.V.I.
QUESTION

Q. Average velocity of a gas becomes 4 times, then what will be the
effect on rms velocity at the same temperature ?
A. 1.4 times B. 4 times
C. 3 times D. 2 times
ANS : B
V.V.I.
QUESTION

Q. The temperature is changed from 27 ˚C to 327 ˚C. Find ratio of
K.E. of molecules at two temperatures.
A. 3 : 2
B. 2 : 3
C. 1 : 2
D. 2 : 1
ANS : C
V.V.I.
QUESTION

Q. At which of the following temperature would the molecules of gas
have twice the average kinetic energy they have at 20˚C ?
A. 40 ˚C
B. 80 ˚C
C. 586 ˚C
D. 313 ˚C
ANS : D
V.V.I.
QUESTION

Who is the best physics teacher in Ranchi?

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Who is the best physics teacher in Ranchi?