| Syllabus | Alternate Universe Cambridge 0625 |
| Subject | Physics (0625) Extended |
| Paper | 0625/41/M/J/25 · Paper 4, Variant 1 |
| Also listed as | 0625_s25_qp_41 · 0625_s25_ms_41 |
| Session | May/June 2025 |
| Questions | 10, multiple choice, with answers and explanations |
| Cost | Free |
0625/41/M/J/25 answer key
Preview the first questions
Question 1
A train accelerates uniformly from rest to 60 m/s in 100 s, runs at 60 m/s for 300 s, then decelerates uniformly to rest in a further 100 s. What total distance does it travel?
- 24 000 m
- 18 000 m
- 30 000 m
- 6000 m
Show the answer and explanation
Correct answer: A
Distance is the area under a speed-time graph. The motion has three sections: a triangle for the acceleration phase, a rectangle for the constant-speed phase, and a triangle for the deceleration phase. Area = (1/2 x 100 x 60) + (60 x 300) + (1/2 x 100 x 60) = 3000 + 18 000 + 3000 = 24 000 m.
Question 2
A single resultant force acts on a moving object. Which of the following changes to the motion can it cause?
- the speed of the object or its direction of motion
- the mass of the object
- only the temperature of the object
- only the density of the object
Show the answer and explanation
Correct answer: A
A resultant force on a moving object produces an acceleration. That acceleration can change the size of the velocity (the speed) and/or the direction of the velocity. It does not change the mass, temperature or density of the object.
Question 3
A skateboarder of mass 65 kg rises through a vertical height of 2.8 m. Taking the gravitational field strength as 9.8 N/kg, how much work is done against gravity?
- about 1800 J
- about 180 J
- about 23 J
- about 18 000 J
Show the answer and explanation
Correct answer: A
Work done against gravity = weight times height = m times g times h = 65 x 9.8 x 2.8 = 1784 J, which rounds to about 1800 J.
Worked answers: questions 4 to 10
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Question 4 · Answer A
Power P = current I times voltage V, so current = power divided by voltage = 2000 W divided by 230 V = 8.7 A.
Question 5 · Answer A
Refractive index n equals the sine of the angle of incidence divided by the sine of the angle of refraction. So the sine of the refraction angle equals the sine of 60 degrees divided by 1.28, which is 0.866 / 1.28 = 0.677. The refraction angle is therefore about 43 degrees.
Question 6 · Answer A
Steel is a hard magnetic material that, once magnetised, retains its magnetism, so it makes a good permanent magnet. Soft iron loses its magnetism easily and is used for temporary magnets such as transformer cores. Copper and plastic are not magnetic.
Question 7 · Answer A
Resistance = voltage divided by current = 230 V divided by 3.9 A = about 59 ohms.
Question 8 · Answer A
For an ideal transformer the turns ratio equals the voltage ratio: Ns divided by Np equals Vs divided by Vp. So Ns = Np x Vs / Vp = 450 x 300 000 / 25 000 = 5400 turns.
Question 9 · Answer A
In beta-minus decay, a neutron in the nucleus changes into a proton and an electron, and the electron is emitted as the beta particle. The proton number rises by 1 (from 38 to 39, so the element becomes yttrium) and the nucleon number stays the same at 90.
Question 10 · Answer A
The Sun's gravitational field strength is greater closer to the Sun. A planet at a smaller orbital radius needs to travel faster to stay in a circular orbit. Earth is much closer to the Sun than Jupiter, so its orbital speed is greater.