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11th Standard Physics - Kinetic Theory of Gases One Mark Question with Answer Key

Published on: 29/08/2019

Kinetic Theory of Gases

Download Tamil Nadu 11th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.

Questions + Answers key

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Std: 11th Standard - Physics

chapter: - Model Question paper

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Questions:

Multiple Choice Question

10 x 1 = 10

According to Dalton's law of partial pressures ______________

(a)

total pressure of a mixture of real gases is the sum of factored in - virtual pressure

(b)

total pressure of a mixture of ideal gases is the difference partial pressure

(c)

total pressure of a mixture of real gases is the sum of pressures

(d)

total pressure of a mixture of real gases is the sum of partial pressure

The perfect gas equation can be written as _________________.

(a)

PV = \(\mu\)RT

(b)

PV = \(\mu\)R

(c)

PV = RT

(d)

P = \(\mu\)RTV

In dynamic equilibrium, molecules of gas collide and change their speeds during the collision _______________.

(a)

but the average properties vary

(b)

but the average properties constant

(c)

but the peak properties constant

(d)

but the rms properties constant

The average distance a molecule can travel without colliding is called ________________.

(a)

mean free distance

(b)

mean free path

(c)

mean free length

(d)

mean free motion

Kinetic theory ___________.

(a)

Correctly explains specific heat capacities of many liquid

(b)

Correctly explains specific heat capacities of many gases

(c)

Correctly explains specific heat capacities of many solids

(d)

Correctly explains specific heat capacities of many super cooled liquid

If the internal energy of an ideal gas U and volume V are doubled then the pressure

(a)

doubles

(b)

remains same

(c)

halves

(d)

quadruples

The average translational kinetic energy of gas molecules depends on

(a)

number of moles and T

(b)

only on T

(c)

P and T

(d)

P only

Two identically sized rooms A and B are connected by an open door. If the room A is air conditioned such that its temperature is 4°C lesser than room B, which room has more air in it?

(a)

Room A

(b)

Room B

(c)

Both room has same air

(d)

Cannot be determined

An ideal gas is maintained at constant pressure. If the temperature of an ideal gas increases from 100K to 1000K then the rms speed of the gas molecules

(a)

increases by 5 times

(b)

increases by 10 times

(c)

remains same

(d)

increases by 7 times

10.

A sample of ideal gas is at equilibrium. Which of the following quantity is zero?

(a)

rms speed

(b)

average speed

(c)

average velocity

(d)

most probable speed

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Answers Key:

Multiple Choice Question

10 x 1 = 10

(d)
total pressure of a mixture of real gases is the sum of partial pressure

(a)
PV = \(\mu\)RT

(b)
but the average properties constant

(b)
mean free path

(b)
Correctly explains specific heat capacities of many gases

Pressure is independent of internal energy.

Average K.E of each degree of freedom
\(=\frac{1}{2} k T=\frac{1}{2} N T[k=N]\)
N - no. of moles
T - temperature

As Temperature of room A is less than that of room B evidently Room A has more air in it.

\(v_{m s}=1.73 \sqrt{\frac{k T}{m}}\)
\(\text { AT Increased by } 10 \text { times }\)
\(v_{\mathrm{ms}} \propto \Delta T\)
\(\text { RMS speed increases by } 10 \text { times. }\)

10.