CCEA 1370 · course-matched practice

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These are original Murray Physics revision questions, not an official CCEA exam paper.

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Actual marks20

Questions14

Topics represented14

Your paper aims for about 20 marks, so the final total may be slightly higher.

Question 1 · Atomic structure and radiation · 1 mark

A sample's corrected count rate falls from 800 counts/s to 100 counts/s. How many half-lives have elapsed?

Your answer Working

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Answer: 3

800 → 400 → 200 → 100, so three half-lives have elapsed.

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Question 2 · Domestic electricity · 1 mark

A 2.0 kW heater runs for 3.0 h. Calculate the electrical energy transferred in kWh.

Your answer

Use unit: kWh

Working

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Answer: 6 kWh

E = Pt = 2.0 kW × 3.0 h = 6.0 kWh.

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Question 3 · Elasticity and materials · 1 mark

What is the extension of a spring?

Choose one answer A. The loaded length B. The natural length C. Loaded length minus natural length D. Force divided by length

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Answer: C

Extension is the increase in length.

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Question 4 · Electric circuits · 3 marks

Explain why the current–potential difference graph for a filament lamp is curved.

Your answer

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Marking points

As the current increases the filament gets hotter.
The metal ions vibrate more, so electrons collide with them more often.
The resistance increases, so current rises less for each extra volt.

The curve shows changing resistance, not a faulty meter.

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Question 5 · Energy · 3 marks

List the measurements needed to calculate power when climbing stairs.

Your answer

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Marking points

Mass of the person.
Vertical height of the stairs.
Time taken to climb.

Power needs energy (from m, g and h) and time.

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Question 6 · Energy resources · 1 mark

A generator receives 2.0 MW of power and provides 1.5 MW of useful electrical power. Calculate its efficiency as a percentage.

Your answer

Use unit: %

Working

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Answer: 75 %

Efficiency = useful output / input × 100 = \(\dfrac{1.5}{2.0}\) × 100 = 75%.

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Question 7 · Forces and motion · 2 marks

State two control variables and explain why each must be kept the same.

Your answer

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Marking points

Distance timed / same trolley, because a different distance or mass changes the time.
Release point and releasing without a push, because a push would change the speed.

Explain how each could affect the result.

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Question 8 · Practical skills and data · 1 mark

A student measures 4.2 s, 4.4 s and 4.3 s. Calculate the mean time.

Your answer

Use unit: s

Working

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Answer: 4.3 s

Mean = \(\dfrac{4.2 + 4.4 + 4.3}{3}\) = 4.3 s.

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Question 9 · Light and optics · 1 mark

Light enters a glass block from air at an angle. What happens to the ray?

Choose one answer A. It bends towards the normal B. It bends away from the normal C. It goes straight on D. It is totally reflected

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Answer: A

Light slows down in glass, so it bends towards the normal.

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Question 10 · Magnetism and electromagnetism · 1 mark

A wire of length 0.20 m carries 3.0 A perpendicular to a 0.50 T magnetic field. Calculate the force on the wire.

Your answer

Use unit: N

Working

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Answer: 0.30 N

F = BIL = 0.50 × 3.0 × 0.20 = 0.30 N.

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Question 11 · Moments and pressure · 2 marks

State the principle of moments.

Your answer

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Marking points

For an object in equilibrium (balanced)…
the total clockwise moment about a pivot equals the total anticlockwise moment about the same pivot.

Both 'total' and 'about the same pivot' matter.

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Question 12 · Particle model · 1 mark

A sample has mass 540 g and volume 200 cm³. Calculate its density.

Your answer

Use unit: g/cm^3

Working

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Answer: 2.7 g/cm^3

ρ = \(\dfrac{m}{V}\) = \(\dfrac{540}{200}\) = 2.7 g/cm³.

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Question 13 · Space physics · 1 mark

A spectral line normally has wavelength 500 nm but is observed at 505 nm from a galaxy. Calculate the increase in wavelength.

Your answer

Use unit: nm

Working

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Answer: 5 nm

Increase = 505 − 500 = 5 nm.

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Question 14 · Waves · 1 mark

Sound travels at 340 m/s. A tone has frequency 170 Hz. Calculate its wavelength.

Your answer

Use unit: m

Working

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Answer: 2 m

λ = \(\dfrac{v}{f}\) = \(\dfrac{340}{170}\) = 2.0 m.

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This paper-level result is for revision feedback and does not change your mastery score.