Properties of Light and Matter

What is the SI unit of pressure?

• Pascal (Pa)

• Kilogram (kg)

• Newton (N)

• Joule (J)

Which of the following best describes Brownian motion?

• Random movement of particles in a gas

• Movement of particles in a solid

• Uniform motion of gas particles

• Constant motion of liquid particles

What happens to the pressure in a liquid as depth increases?

• It decreases

• It remains constant

• It fluctuates

• It increases

Which of the following is a characteristic of solids?

• They have a definite shape and volume

• They have no fixed shape

• They are compressible

• They flow easily

What is the process called when a solid changes directly to a gas?

• Melting

• Evaporation

• Sublimation

• Condensation

If a block of wood is placed on a table, which force acts on it?

• Gravitational force

• Electrostatic force

• Frictional force

• Magnetic force

How does increasing the area of contact affect pressure?

• It decreases pressure

• It increases pressure

• It has no effect

• It doubles the pressure

What is the relationship between mass and weight?

• Mass and weight are the same

• Mass is weight times gravitational acceleration

• Weight is mass divided by gravitational acceleration

• Weight is mass times gravitational acceleration

What is the primary reason that gases have no definite shape?

• Gases are incompressible

• Particles are closely packed

• Particles are far apart and move freely

• Particles vibrate in fixed positions

What is the effect of temperature on surface tension?

• It doubles surface tension

• It has no effect

• It decreases surface tension

• It increases surface tension