Daily Practice

GCSE Science

10th August 1992

5 questions · GCSE · 584 questions in this band

1
Atomic Structure and the Development of the Model
Describe the plum pudding model.
2
Radioactivity, Half-Life and Nuclear Uses
A GM tube detects a count rate of 240 counts per minute from a source. After 15 days the count rate has fallen to 30 counts per minute. Show that this data is consistent with a half-life of 5 days.
3
Forces
A resultant force of 45 N acts on an object of mass 9.0 kg. Calculate its acceleration. Use F = m x a.
4
Motion: Speed, Velocity and Acceleration
A runner completes a 400 m race in 52 s. Calculate her average speed, giving your answer to 3 significant figures.
5
Forces, Newton's Laws and Momentum
Explain, using Newton's Third Law, why a swimmer is able to push themselves forward by pushing backward against the water.

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