Physics 11th Chap 8 : Topic 9 - Maryam Publications

Physics Chapter 8 : Topic 9

Pressure, Volume and Temperature Relations

1 / 35

According to the kinetic theory of gases, gas pressure is mainly due to:

A) Attraction between gas molecules

B) Collisions of gas molecules with container walls

C) Size of gas molecules

D) Weight of gas molecules

2 / 35

When the temperature of a gas increases at constant volume, the pressure increases because:

A) Particles become larger.

B) Particles move faster and collide more frequently with walls.

C) The volume of particles decreases.

D) The number of particles increases.

3 / 35

A gas is kept in a rigid container. If its temperature is increased, which quantity remains constant?

A) Pressure

B) Speed of particles

C) Average kinetic energy

D) Volume

4 / 35

At constant volume, the relationship between pressure and absolute temperature of a gas is:

A) Pressure remains unchanged

B) Pressure decreases as temperature increases

C) Pressure increases directly with temperature

D) Pressure increases only if volume increases

5 / 35

When a gas is heated in a sealed rigid container, the increased pressure is because:

A) The number of molecules increases

B) Gas molecules occupy more space

C) Molecules strike the walls with greater speed and force

D) Molecules collide with each other only

6 / 35

If the absolute temperature of a gas at constant volume is doubled, its pressure becomes:

A) Double

B) Four times

C) Half

D) Unchanged

7 / 35

The temperature of a gas is a measure of:

A) Average kinetic energy of particles

B) Pressure only

C) Total volume of gas

D) Number of molecules

8 / 35

In a constant-volume process, increasing temperature causes pressure to increase because:

A) Molecules become heavier

B) Molecules move faster and transfer more momentum during collisions

C) The container expands

D) Molecules stop moving

9 / 35

A gas thermometer works on the principle that:

A) Volume changes with pressure

B) Pressure is independent of temperature

C) Gas particles stop moving at low temperature

D) Pressure changes with temperature at constant volume

10 / 35

If the pressure of a fixed amount of gas decreases in a rigid container, the temperature must:

A) Remain constant

B) Become infinite

C) Decrease

D) Increase

11 / 35

When a gas is heated at constant pressure, its volume increases because:

A) Particles move slower

B) Faster particles push the container walls outward until pressure remains constant

C) The number of particles increases

D) Particles become larger

12 / 35

At constant pressure, the volume of a gas is directly proportional to:

A) Density

B) Absolute temperature

C) Mass only

D) Number of collisions only

13 / 35

A balloon expands when placed in sunlight because:

A) The gas particles stop moving.

B) The number of particles increases.

C) Temperature increases, causing particles to move faster and push outward.

D) Pressure always increases.

14 / 35

A gas occupies $\mathbf{2\ L}$ at $\mathbf{300\ K}$. If pressure remains constant and temperature becomes $\mathbf{600\ K}$, the volume will be:

A) $\mathbf{6\ L}$

B) $\mathbf{4\ L}$

C) $\mathbf{1\ L}$

D) $\mathbf{2\ L}$

15 / 35

During heating of a gas at constant pressure, the average kinetic energy of particles:

A) Decreases

B) Remains zero

C) Remains unchanged

D) Increases

16 / 35

A gas expands when heated at constant pressure because:

A) The particles become fewer.

B) The molecular mass decreases.

C) The pressure becomes zero.

D) The particles occupy more volume due to increased motion.

17 / 35

At constant temperature, compressing a gas increases pressure because:

A) Particles become larger.

B) Particles gain kinetic energy.

C) Particles collide more frequently with the container walls.

D) Number of particles increases.

18 / 35

Boyle’s law describes the relationship between:

A) Pressure and volume at constant temperature

B) Volume and temperature at constant pressure

C) Mass and temperature

D) Pressure and temperature at constant volume

19 / 35

A gas is compressed to half its original volume at constant temperature. Its pressure becomes:

A) Double

B) Half

C) Unchanged

D) Four times

20 / 35

During isothermal compression of a gas:

A) Temperature increases continuously

B) Particle speed decreases

C) Average kinetic energy remains constant

D) Particle speed increases

21 / 35

If the volume of a gas increases at constant temperature, the pressure decreases because:

A) Collisions with walls become less frequent

B) Number of particles decreases

C) Molecules stop moving

D) Temperature decreases

22 / 35

A syringe containing air is pushed inward while temperature remains constant. The pressure increases because:

A) Air molecules become heavier

B) Volume increases

C) Air molecules become hotter

D) Molecules collide with the syringe walls more often

23 / 35

Which change will definitely increase the pressure of a fixed amount of gas?

A) Decreasing temperature at constant volume

B) Increasing volume at constant temperature

C) Increasing temperature at constant volume

D) Increasing volume at constant pressure

24 / 35

A gas has constant pressure and its temperature decreases. The volume will:

A) Remain constant

B) Decrease

C) Become zero immediately

D) Increase

25 / 35

Which statement correctly explains Boyle’s law using particles?

A) Higher temperature causes larger molecules.

B) Pressure does not depend on collisions.

C) Larger volume increases particle speed.

D) Smaller volume causes more frequent wall collisions.

26 / 35

Which statement correctly explains Charles’ law?

A) Temperature changes particle number.

B) Gas pressure decreases when temperature increases.

C) Gas volume increases with temperature because particles move faster.

D) Molecules stop moving during expansion.

27 / 35

Which statement is true for an ideal gas at constant temperature?

A) Pressure and volume increase together

B) Pressure remains constant always

C) Pressure and volume are inversely proportional

D) Increasing volume increases pressure

28 / 35

A gas is heated in a container that can expand freely while maintaining constant pressure. What happens to particles?

A) Their number increases.

B) They stop colliding.

C) Their average kinetic energy increases.

D) Their mass increases.

29 / 35

Why does a car tyre pressure increase after long driving?

A) Tyre volume always increases greatly

B) Gas particles become heavier

C) Gas temperature increases, making particles collide more strongly

D) Number of molecules increases

30 / 35

The combined gas law is based on the relationship between:

A) Mass, force, and acceleration

B) Energy, momentum, and force

C) Density and gravity only

D) Pressure, volume, and temperature

31 / 35

A gas is cooled at constant volume. The pressure decreases because:

A) Molecular size decreases

B) Particles collide less frequently and with less force

C) Volume increases

D) Molecules disappear

32 / 35

Which condition must remain unchanged when studying pressure-temperature relationship?

A) Temperature

B) Number of particles only

C) Pressure

D) Volume

33 / 35

Which condition must remain unchanged when studying volume-temperature relationship?

A) Pressure

B) Temperature

C) Volume

D) Particle speed

34 / 35

Which condition must remain unchanged when studying pressure-volume relationship?

A) Pressure

B) Volume

C) Temperature

D) Number of collisions

35 / 35

A decrease in gas temperature causes pressure to decrease at constant volume because:

A) Particles stop existing

B) Volume increases

C) Gas becomes liquid immediately

D) Particles have less kinetic energy and collide less forcefully

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