Pre-test Paper 1 IGCSE

A digital stop-clock measures time in minutes and seconds. The stop-clock reads 00:50 when it is started (i.e. 00 minutes 50 seconds). It reads 02:10 when it is stopped. What is the shortest possible time that has elapsed between starting and stopping the stop-clock?

• 1 minute 20 seconds

• 2 minutes 00 seconds

• 2 minutes 10 seconds

• 3 minutes 00 seconds

A long-distance runner wishes to calculate her average speed for a race. Which calculation should she use?

• average speed = total distance/total time

• average speed = total distance × total time

• average speed = total time/total distance

• average speed = total distance + total time

A heavy metal ball falls vertically downwards through air past four equally spaced levels J, K, L and M.

• A

• B

• C

• D

An arrow travels horizontally in a straight line at constant speed. In which direction does the weight act?

• A

• B

• C

• D

Two rectangular blocks consist of different materials. Four different methods are suggested to compare the two masses.

1 Compare the accelerations with which they fall freely.

2 Compare the values of their lengths × breadths × heights.

3 Hang each in turn from the same spring. Compare the extensions.

4 Place one in the right-hand pan of a beam balance and the other in the left-hand pan.

Which methods give a comparison of the two masses?

• 1, 2 and 3

• 1 and 2 only

• 3 and 4 only

• 4 only

The diagrams show four solid blocks with their dimensions and masses. Which block has the greatest density?

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A mass of 20 kg is held stationary by a rope passing over a frictionless pulley. What is the tension T in the rope?

• 10 kg

• 20 kg

• 100 N

• 200 N

A spring is suspended from a stand. Loads are added and the extensions are measured. Which graph shows the result of plotting extension against load?

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A wooden bar is pivoted at its centre so that it can rotate freely. Two equal forces F are applied to the bar.

In which diagram is the turning effect greatest?

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A machine is very efficient. What does this mean?

• It produces a large amount of power.

• It uses very little energy.

• It wastes very little energy.

• It works very quickly.