Chapter Exam

Chapter-8 Kinetic Particle Model — Online MCQ Test

PHYSICS · Grade 10 · IGCSE cambridge

Practice Chapter-8 Kinetic Particle Model with a free chapter-wise online MCQ test for IGCSE cambridge Grade 10 PHYSICS. This chapter covers: The states of matter explained by particle motion gas pressure and Brownian motion.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-8 Kinetic Particle Model — Important Questions & Answers (FAQ)

Frequently asked questions from IGCSE cambridge Grade 10 PHYSICS — Chapter-8 Kinetic Particle Model, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following best describes the kinetic particle model?

A. All matter is composed of tiny particles that are in constant random motion ✓
B. Particles in solids do not move at all
C. Gases have particles that are tightly packed together
D. Liquids have particles with no spaces between them

Answer: A. All matter is composed of tiny particles that are in constant random motion
The kinetic particle model explains that all matter consists of particles in constant random motion; the degree and nature of this motion varies with the state of matter.

In a solid, how do particles behave according to the kinetic particle model?

A. They move freely throughout the entire volume
B. They vibrate about fixed positions with very small amplitude ✓
C. They move randomly with high speeds
D. They remain completely stationary

Answer: B. They vibrate about fixed positions with very small amplitude
Particles in solids vibrate about fixed lattice positions with small amplitude; this is why solids have fixed shape and volume.

When a gas is heated at constant volume, its pressure increases. Which explanation from the kinetic particle model accounts for this?

A. Particles expand and push harder on the walls
B. Particles move faster and collide more frequently and forcefully with the container walls ✓
C. More particles are created due to heating
D. The container becomes weaker and allows particles to escape

Answer: B. Particles move faster and collide more frequently and forcefully with the container walls
Heating increases particle kinetic energy, making them move faster; this results in more frequent and energetic collisions with the container walls, increasing pressure.

A gas is compressed isothermally (constant temperature). Explain why the pressure increases using the kinetic particle model.

A. Particle speed increases due to compression
B. The number of particles increases
C. The same number of faster-moving particles occupies less volume, resulting in more frequent collisions with walls per unit time ✓
D. Particle size increases during compression

Answer: C. The same number of faster-moving particles occupies less volume, resulting in more frequent collisions with walls per unit time
In isothermal compression, particle speed remains constant (constant T), but reducing volume decreases the space available, increasing collision frequency with walls per unit area, thus increasing pressure.

A rigid container filled with a mixture of nitrogen and oxygen gases at room temperature has equal pressure contributions from each gas. If the temperature is increased, which statement is most accurate according to the kinetic particle model?

A. Only nitrogen pressure increases because it is lighter
B. Only oxygen pressure increases because it is heavier
C. Both pressures increase proportionally because both gain kinetic energy equally at the same temperature ✓
D. The total pressure remains constant because the container is rigid

Answer: C. Both pressures increase proportionally because both gain kinetic energy equally at the same temperature
Both gases experience the same temperature increase, giving particles of both gases equal increase in average kinetic energy; both contribute proportionally more pressure through increased collision frequency.