0654 physics

• 0.070 N/ cm

• 0.16 N/ cm

• 0.25 N/ cm

• 4.0 N/ cm

The table gives the weight and total area of contact with the ground of four animals. Which animal exerts the least pressure on the ground?

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A ball falls vertically downwards. Which energy transfer takes place as the ball accelerates downwards?

• gravitational potential to elastic potential (strain)

• gravitational potential to kinetic

• elastic potential (strain) to kinetic

• kinetic to gravitational potential

A 250W electric motor lifts a 50 N load through a height of 4.0 m in 3.0 s. What is the efficiency of this system of lifting the load?

• 15%

• 27%

• 38%

• 67%

Which labelled arrow on the diagram represents condensation?

• A

• B

• C

• D

A sealed cylinder contains gas. The average speed of the molecules of the gas increases but the average distance between them remains the same. How does this affect the pressure of the gas and its volume?

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Four loudspeakers vibrate at different frequencies. Which frequency produces a sound with the largest wavelength and can be heard by a human?

• 15Hz

• 150Hz

• 2.5 kHz

• 25 kHz

The diagram shows a ray of light striking a plane mirror.

What is the angle of reflection?

Which diagram shows a converging lens forming a real image of an object O?

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The diagram represents a wave in air. Molecules are closer together in region P than they are in region Q.

Which type of wave is represented, and in which direction do the molecules vibrate?

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