O level Physics Kinetic Model of Matter (10 qns)

Which statement about a fixed mass of gas is correct?

• As pressure increases at constant temperature, the volume decreases

• As pressure increases at constant temperature, the volume increases

• As temperature increases at constant pressure, the volume decreases

• As temperature increases at constant volume, the volume increases

In the kinetic model of gases, what is pressure equal to?

• The average force each particle exerts when it hits and rebounds from a surface of the gas container

• The force of particles hitting and rebounding from all the surfaces in the gas container

• The force exerted by the particles hitting and rebounding from other particles in the gas container

• The force exerted by the particles hitting and rebounding from a unit area of the gas container surface

Smoke particles when suspended in air are viewed with a microscope. They are seen to move randomly. Which best explains the motion of the smoke particles?

• Air molecules are far apart from each other

• Air molecules collide with each other

• Air molecules move randomly

• Smoke particles move randomly

A gas of the same volume as a liquid expands faster when heated. Which of the reasons is correct?

• The gas molecules are bigger

• The gas molecules expand faster

• The forces between gas molecules are weaker than those between liquid molecules

• The gas molecules collide more frequently with each other

What best explains why heavy particles settle down quickly but very small particles remain suspended for a long period of time?

• Air pressure has a greater effect on smaller particles

• Random molecular bombardment by air molecules keeps the small particles suspended

• The earth's gravitational field does not act on very small particles

• The small smoke particles have the same density as air

Why does the pressure of the air increase when the piston is pushed from X to Y?

• The air molecules are moving faster

• The collision between the air molecules increases

• The forces between air molecules increases

• The rate of collision of the air molecules with the wall increases

Which diagram shows the relationship between the volume and the pressure of the gas?

• 
• 
• 
• 

What happens to the molecules in a solid when the solid melts?

• The kinetic energy of the molecules increases and spacing between molecules increases

• The potential energy of the molecules remains unchanged and spacing between molecules decreases

• The kinetic energy of the molecules remains unchanged and spacing between molecules increases

• The potential energy of the molecules decreases and spacing between molecules decreases

A gas in a sealed cylinder with fixed volume is heated. Which of the following does not increase as the gas is heated?

• The average distance between the gas molecules

• The average kinetic energy of the gas molecules

• The average number of gas molecules hitting the cylinder walls per second

• The average speed of the gas molecules

Gas inside a sealed cylinder is heated slowly to a higher temperature. The pressure inside the gas cylinder remains constant as the frictionless piston pushes outwards. What is true about the gas particles as the temperature rises?

• Speed of gas molecules increases

• Speed of gas molecules decreases

• Frequency of collision with piston decreases

• Frequency of collision with piston increases