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Secondary 1 Science Physical Sciences Quiz
Free Sec 1 Science Physical Sciences quiz, LongCat Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Secondary 1 Science Quiz - Physical Sciences
Answer Key
Section A: Multiple Choice (Questions 1–5)
1. B
- Chemical energy from the student's muscles is converted into kinetic energy (motion of the box) and thermal energy (due to friction between the box and the floor).
- Common mistake: Choosing A and forgetting that friction generates thermal energy.
2. D
- Speed is a derived quantity calculated from distance (length) and time. Mass, time, and length are base quantities.
3. C
- Work done = Force × Distance = 20 N × 5 m = 100 J
4. A
- As the ball rises, it slows down. Its kinetic energy decreases while its gravitational potential energy increases.
5. A
- Work done = Force × Distance moved in the direction of the force. Since the bag is stationary, the distance moved is 0 m. Therefore, work done = 0 J.
- Common mistake: Students multiply force by time or assume holding requires work.
Section B: Short Answer (Questions 6–10)
6. (a) Newton (N) [1] (b) Joule (J) [1] (c) Joule (J) [1]
7. Work done is defined as the product of the force applied on an object and the distance moved by the object in the direction of the force. [2]
- Accept: "Work is done when a force moves an object through a distance in the direction of the force."
8. Work done = Force × Distance
- Force = Weight of load = mass × g = 200 kg × 10 N/kg = 2000 N [1]
- Work done = 2000 N × 10 m = 20,000 J [2]
- Final answer: 20,000 J or 20 kJ [1]
9. The force applied by the student is upwards (to support the bag), but the displacement is horizontal. Since the force and displacement are perpendicular, no work is done. [2]
- Alternatively: The distance moved in the direction of the force is zero.
10. (a) Mass is the amount of matter in an object; weight is the gravitational force acting on the object. [1] (b) Mass is measured in kilograms (kg); weight is measured in newtons (N). [1]
- Also accept: Mass is constant everywhere; weight varies with gravitational field strength. Mass is a scalar; weight is a vector.
Section C: Structured Response (Questions 11–15)
11. (a) Point A. [1] The car is at the highest point, so it has the greatest gravitational potential energy (GPE = mgh, and h is maximum at A). [1]
(b) Gravitational potential energy → Kinetic energy [1] As the car descends, its height decreases (GPE decreases) and its speed increases (KE increases). [1]
(c) Some energy is converted to thermal energy due to friction between the wheels and the track, and air resistance. [2]
- The total mechanical energy is not conserved; some is lost as heat/sound.
12. (a) Weight = mass × g = 50 kg × 10 N/kg = 500 N [1]
(b) Work done = Force × Distance = 500 N × 4 m = 2000 J [2]
- Work is done against gravity, so the force equals the weight.
(c) Power = Work done ÷ Time = 2000 J ÷ 8 s = 250 W [2]
13. (a) The force applied is directly proportional to the compression of the spring. [1] As the force doubles, the compression also doubles. [1]
(b) 5 cm [1]
- From the pattern: Force ÷ 2 = Compression. So 10 N ÷ 2 = 5 cm.
(c) The spring has not exceeded its elastic limit / The spring obeys Hooke's Law / The relationship remains linear. [1]
14. (a) GPE = mgh = 2 kg × 10 N/kg × 20 m = 400 J [2]
(b) 400 J [1]
- By conservation of energy, all GPE is converted to KE (ignoring air resistance).
(c) KE = ½mv²
- 400 = ½ × 2 × v² [1]
- 400 = v² [1]
- v = √400 = 20 m/s [1]
15. (a) Work done = Force × Distance = 30 N × 4 m = 120 J [1]
(b) Useful work done = Total work done − Energy lost to friction = 120 J − 80 J = 40 J [2]
(c) Efficiency = (Useful work ÷ Total work) × 100% = (40 ÷ 120) × 100% = 33.3% [2]
- Accept 33% or 1/3.
Section D: Data Interpretation (Questions 16–20)
16. (a) As speed increases, kinetic energy increases. [1] The relationship is non-linear; kinetic energy increases more rapidly as speed increases (KE is proportional to v²). [1]
(b) Approximately 100–150 J (accept reasonable estimate based on the curve). [1]
(c) Kinetic energy is proportional to the square of the speed (KE = ½mv²). [1] Since KE depends on v², doubling the speed quadruples the kinetic energy, resulting in a curved (non-linear) graph. [1]
17. (a) Both students do the same amount of work. [1] Work done depends only on force (weight of box) and vertical distance (height of stairs), which are identical for both students. [1]
(b) Ali develops more power. [1] Power = Work ÷ Time. Since both do the same work but Ali takes less time (10 s < 15 s), Ali's power is greater. [1]
18. (a) Point Y (and point Z). [1] The bob is at its lowest point, moving fastest, so kinetic energy is maximum. [1]
(b) Point X. [1] The bob is at its highest point, momentarily at rest, so gravitational potential energy is maximum. [1]
19. (a) Power = Work ÷ Time
- Machine W: 500 ÷ 10 = 50 W [1]
- Machine X: 600 ÷ 20 = 30 W [1]
- Machine Y: 300 ÷ 5 = 60 W [1]
- Machine Z: 800 ÷ 40 = 20 W [1]
(b) Machine Y [1]
20. (a) Drop height [1]
(b) Crater depth [1]
(c) As the drop height increases, the crater depth also increases. [1] The relationship is positive/direct — higher drop heights result in deeper craters. [1]
(d) To ensure a fair test / To control variables / So that only the drop height affects the crater depth. [1]
Marking Notes:
- Award marks for correct method even if final answer has minor arithmetic errors.
- Accept equivalent phrasing where the scientific meaning is correct.
- Units must be stated for full marks on calculation questions.