Compound units (speed, density, pressure)
AQA GCSE Maths revision on Compound units (speed, density, pressure). Aligned to the AQA GCSE Mathematics 8300 specification. This bank has 16 practice questions on this topic.
Sample questions (3 of 16)
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Question 1
A car travels 150 miles in 3 hours at a constant speed, so what is the average speed of the car?
- A) 50 miles per hour
- B) 45 miles per hour
- C) 60 miles per hour
- D) 30 miles per hour
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Answer: 50 miles per hour
The correct answer is 50 miles per hour, calculated by dividing the total distance of 150 miles by the time of 3 hours. A common error is to multiply the numbers instead of dividing them, which would lead to the incorrect answer of 450.
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Question 2
A solid block has a mass of 40 grams and a volume of 8 cubic centimetres, so what is the density of the block?
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Answer: 5
The density is 5 grams per cubic centimetre. This is found by dividing the mass of 40 grams by the volume of 8 cubic centimetres. Students who multiply these values will incorrectly arrive at 320.
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Question 3
A metal plate exerts a force of 120 Newtons over an area of 4 square metres, so what is the pressure exerted by the plate?
- A) 30 Pascals applied
- B) 40 Pascals applied
- C) 20 Pascals applied
- D) 50 Pascals applied
Show answer
Answer: 30 Pascals applied
The correct answer is 30 Pascals applied, which is the result of dividing 120 Newtons by 4 square metres. Dividing the area by the force is a common mistake that leads to an incorrect value of 0.033.
Want to test yourself on the remaining cards for this topic?
13 more questions on Compound units (speed, density, pressure) — plus mistakes tracking and spaced repetition across the whole Maths spec.