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Question (11)

QN0038281

Gas at a pressure is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure will be equal to

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

and .

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Question (12)

QN0038282

When a gas is in thermal equilibrium, its molecules

(A)
have the same average kinetic energy of molecules
(B)
have different energies which remain constant
(C)
have a certain constant energy
(D)
do not collide with one another

Correct Answer: A

Explanation:

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Question (13)

QN0038283

If gas molecules each of mass collide with a surface (perpendicular to it) elastically per second over an area with a speed , the pressure exerted by the gas molecules will be of the order of

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

(None) Rate of change of momentum during collision

so pressure

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Question (14)

QN0038284

In a mixture of gases at a fixed temperature

(A)
heavier molecule has higher average speed
(B)
lighter molecule has lower average speed
(C)
heavier molecule has lower average speed
(D)
None of these

Correct Answer: C

Explanation:

Lighter the molecule, higher the average speed.

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Question (15)

QN0038285

The average kinetic energy per molecule of any ideal gas is always equal to

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

In equilibrium, the average kinetic energy of molecules of different gases will be equal. That is

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Question (16)

QN0038286

The average kinetic energy of gas molecules depends upon which of the following factor?

(A)
Nature of the gas
(B)
Volume of the gas
(C)
Temperature of the gas
(D)
Both (b) & (c)

Correct Answer: B

Explanation:

Average kinetic energy of gas molecues depends on the temperature of the gas as

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Question (17)

QN0038287

Let denote the rms speed of the molecules in an ideal diatomic gas at absolute temperature .
The mass of a molecule is ' ' neglecting vibrational energy terms, the false statement is

(A)
a molecule can have a speed greater than
(B)
is proportional to
(C)
the average rotational K.E. of a molecule is
(D)
the average K.E. of a molecule is

Correct Answer: C

Explanation:

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Question (18)

QN0038288

The temperature of a gas is a measure of

(A)
the average kinetic energy of the gaseous molecules
(B)
the average potential energy of the gaseous molecules
(C)
the average distance between the molecules of the gas
(D)
the size of the molecules of the gas

Correct Answer: A

Explanation:

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Question (19)

QN0038289

In the isothermal expansion of of gas from volume to the work done by the gas is . What is the root mean square speed of the molecules of the gas at that temperature?

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

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Question (20)

QN0038290

The speed of sound in oxygen at a certain temperature is . The speed of sound in helium at the same temperature will be (assume both gases to be ideal)

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

The speed of sound in a gas is given by

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Question (11)

Gas at a pressure is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure will be equal to

Explanation:

Link:

Question (12)

When a gas is in thermal equilibrium, its molecules

Explanation:

Link:

Question (13)

If gas molecules each of mass collide with a surface (perpendicular to it) elastically per second over an area with a speed , the pressure exerted by the gas molecules will be of the order of

Explanation:

Link:

Question (14)

In a mixture of gases at a fixed temperature

Explanation:

Link:

Question (15)

The average kinetic energy per molecule of any ideal gas is always equal to

Explanation:

Link:

Question (16)

The average kinetic energy of gas molecules depends upon which of the following factor?

Explanation:

Link:

Question (17)

Let denote the rms speed of the molecules in an ideal diatomic gas at absolute temperature .The mass of a molecule is ' ' neglecting vibrational energy terms, the false statement is

Explanation:

Link:

Question (18)

The temperature of a gas is a measure of

Explanation:

Link:

Question (19)

In the isothermal expansion of of gas from volume to the work done by the gas is . What is the root mean square speed of the molecules of the gas at that temperature?

Explanation:

Link:

Question (20)

The speed of sound in oxygen at a certain temperature is . The speed of sound in helium at the same temperature will be (assume both gases to be ideal)

Explanation:

Link:

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Let denote the rms speed of the molecules in an ideal diatomic gas at absolute temperature .
The mass of a molecule is ' ' neglecting vibrational energy terms, the false statement is