PHYSICS TEST

Name

Year Group

Brakes are used to slow down a moving car. Into which form of energy is most of the kinetic energy converted as the car slows down?

• chemical
• elastic
• thermal
• sound

What is a disadvantage of nuclear fission as a source of energy?

• Nuclear power stations are expensive to build.
• Nuclear power stations are unreliable.
• Nuclear power stations can only provide small quantities of energy.
• Nuclear power stations release large quantities of carbon dioxide into the atmosphere.

Which quantities, in addition to the acceleration of free fall g, affect the pressure at the bottom of a pond of water?

• the density of the water and the depth of the pond only
• the density of the water and the surface area of the pond only
• the depth of the pond and the surface area of the pond only
• the depth of the pond, the density of the water and the surface area of the pond

The statements describe what happens when the power of a machine is increased. 1. The work done in a given time decreases. 2. The work done in a given time increases. 3. The time taken to do a given quantity of work decreases. 4. The time taken to do a given quantity of work increases. Which statements are correct?

• 1 and 3
• 1 and 4
• 2 and 3
• 2 and 4

Which source of energy is not currently used to generate electrical energy?

• nuclear fusion
• solar
• tidal
• waves

A mass is lifted from rest on the ground to Y. There is no air resistance. P is the increase in gravitational energy of the mass. Q is the kinetic energy of the mass at Y. Which expression is equal to the mechanical work done on the mass?

• P + Q
• P – Q
• Q – P
• P × Q

A pressure gauge is lowered into the sea. Measurements of the pressure and depth are taken as the pressure gauge is lowered. Which statement describes how and why the pressure changes as the gauge is lowered?

• The density of the sea water decreases so the pressure increases.
• The depth of the gauge below the surface of the sea increases so the pressure increases.
• The height of the gauge above the sea bed decreases so the pressure decreases.
• The temperature of the sea water decreases so the pressure decreases.

The pressure of a fixed mass of gas in a cylinder is measured. The volume of the gas in the cylinder is slowly decreased. The temperature of the gas does not change. Which graph shows how the pressure of the gas changes during this process?

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