IGCSE Physics-Kinetic Model of Matter

Which of the following properties cannot be explained by the kinetic theory of particle?

• Density
• Compressibility 
• Shape
• Colour

Which of the following statements best explains why the fragrance of a perfume can move from one place to another?

• The perfume particles moves randomly in all directions on their own.
• The perfume particles expand their sizes when exposed to air.
• The perfume particles are carried by the air molecules.
• The perfume particles are moved by the wind.

Which of the following is not a property of a solid?

• It expands a little when heated compared to a liquid
• It takes any shape of a container
• It is not easy to be compressed
• It usually has a higher density than a gas

What would be the change when heat is supplied to a gas?

• The particles in the matter expand tremendously.
• The particles move randomly in all directions.
• The average kinetic energy of the particles increases.
• The particles contract and occupy lesser space.

A container filled with a gas is heated without changing its volume. Which of the following statement is true?

• The average kinetic energy of gas particles decreases.
• The force exerted on the surface area of the wall increases.
• There is no change in pressure exerted on the walls of the containers.
• The temperature causes the gas particles to expand in size.

The pressure of a fixed mass of gas increases when the volume of a container is reduced at a constant temperature. Which of the following best explains this statement?

• The size of the molecules decreases.
• The mass of the molecules increases.
• The average speed of the molecules increases.
• The molecules collide more frequently with one another and with the wall of container.

Which of the following statements explains the Brownian motion of smoke particles?

• It is the collision between the smoke particles.
• It is the collision between the smoke particles and the wall of a container.
• It is the collision between the smoke particles and air particles.
• It is the collision between the smoke particles and the light.

Which of the following statements is not correct when a fixed mass of gas in an enclosed container is heated?

• The pressure of the gas increases.
• The average distance between the gas molecules increases.
• The average kinetic energy of gas molecules increases.
• The frequency of the collisions of the gas molecules increases.

Which of the following has the lowest density?

• Diamond
• Rock
• Water
• Helium

When ice melts into water,

• the intermolecular force weakens and the molecules move slower.
• the intermolecular force weakens and the speed of molecules increases
• the intermolecular force becomes stronger and the molecules move faster.
• the intermolecular force becomes stronger and the speed of the molecules decreases.