PSLE Science Physics Topics 1 ā Questions and Answers
Question 1: What form of energy does a moving car have?
- Potential energy
- Kinetic energy (Correct answer)
- Chemical energy
- Sound energy
Correct answer: Kinetic energy
A moving car has kinetic energy ā the energy of motion. The faster it moves, the more kinetic energy it has.
Question 2: Which material is a good conductor of electricity?
- Rubber
- Wood
- Copper (Correct answer)
- Plastic
Correct answer: Copper
Copper is an excellent conductor of electricity because it allows electric charges to flow through it easily. That is why wires are often made of copper.
Question 3: What is the SI unit of force?
- Joule
- Watt
- Newton (Correct answer)
- Kilogram
Correct answer: Newton
The Newton (N) is the SI unit of force, named after Sir Isaac Newton. 1 N is the force needed to accelerate 1 kg by 1 m/sĀ².
Question 4: Which of the following is a source of light?
- Moon
- Mirror
- Sun (Correct answer)
- Shiny spoon
Correct answer: Sun
The Sun produces its own light through nuclear fusion. The Moon and mirrors only reflect light from other sources.
Question 5: What happens to the shadow of an object when the light source moves closer to it?
- The shadow gets smaller
- The shadow gets larger (Correct answer)
- The shadow disappears
- The shadow stays the same
Correct answer: The shadow gets larger
When the light source moves closer to an object, the shadow becomes larger because the object blocks a greater proportion of the light.
Question 6: Which type of force acts between two surfaces in contact and opposes motion?
- Gravitational force
- Magnetic force
- Friction (Correct answer)
- Elastic force
Correct answer: Friction
Friction is a force that acts between surfaces in contact and opposes the movement of one surface over another.
PSLE Science Physics Topics 1
What form of energy does a moving car have?