Grade 8 Science
Multiple Choice Questions
1. Motion, Force and Work
1. What characteristic must an object have to be considered doing work?
A. It must be stationary
B. It must produce heat
C. It must move in the direction of the force
D. It must be in contact with another object
2. What does a flat horizontal line on a distance-time graph indicate?
A. The object is moving at a constant speed
B. The object is accelerating
C. The object is at rest
D. The object is moving backward
3. A car travels 150 km in 3 hours. What is its speed?
A. 50 km/h
B. 45 km/h
C. 60 km/h
D. 30 km/h
4. What is the work done when a force of 10 N moves an object 5 meters?
A. 50 J
B. 15 J
C. 5 J
D. 100 J
5. Which of the following is NOT a characteristic of movement?
A. Change in position
B. Change in direction
C. Staying in the same place
D. Change in speed
2. Simple Machines
6. Which of the following is an example of a simple machine in daily life?
A. Television
B. Scissors
C. Refrigerator
D. Battery
7. What is the weight lifted by a lever with a force of 10 N at a 2:1 advantage?
A. 20 N
B. 5 N
C. 10 N
D. 15 N
8. What force is needed to lift a 100 N load using a pulley system with a mechanical
advantage of 4?
A. 25 N
B. 50 N
C. 75 N
D. 100 N
9. What is the Mechanical Advantage (MA) of an inclined plane if the length is 8 m and
the height is 2 m?
A. 4
B. 2
C. 6
D. 8
10. What is a daily life example of an inclined plane?
A. Knife
B. Ramp
C. Hammer
D. Screw
11. Which of the following is an example of a lever used in daily life?
A. Door handle
B. Pulley
C. Ramp
D. Screwdriver used to open a paint can
3. Pressure in Solid, Liquid, and Gases
12. Which of the following increases hydrostatic pressure in a liquid?
A. Decreasing liquid density
B. Increasing container width
C. Increasing depth
D. Reducing temperature
13. Two objects have the same volume, but one is heavier. Which one has greater
density?
A. The heavier one
B. The lighter one
C. Both have equal density
D. Depends on shape
14. Which condition will increase the pressure of a gas inside a container?
A. Increase the volume
B. Decrease the number of gas particles
C. Lower the temperature
D. Decrease the volume
15. Which factor affects pressure on solids?
A. Surface area only
B. Force only
C. Both force and area
D. Density only
16. A woman wears high heels. How does this affect the pressure she applies to the
ground compared to flat shoes?
A. Less pressure due to smaller area
B. More pressure due to smaller area
C. No change in pressure
D. Depends on her height
17. A brick lies flat and then stands on its edge. What changes?
A. Its weight
B. Its volume
C. The pressure it exerts
D. Its mass
18. How do you calculate hydrostatic pressure at a certain depth in water?
A. Force × Area
B. Density × Gravity × Height
C. Mass ÷ Volume
D. Area ÷ Force
4. Magnetism
19. What are the two types of magnetic poles?
A. East and West
B. Positive and Negative
C. North and South
D. Up and Down
20. Which part of an electromagnet is usually made from a coil of wire?
A. Core
B. Battery
C. Switch
D. Solenoid
21. What causes electromagnetic induction?
A. A stationary magnetic field
B. A constant electric current
C. A changing magnetic field
D. A chemical reaction
22. Which factor increases the strength of an electromagnet?
A. Using a plastic core
B. Decreasing the number of coil turns
C. Increasing the current
D. Using a longer wire
23. What is one benefit of an electric car compared to a gasoline-powered car?
A. Higher carbon emissions
B. Lower energy efficiency
C. Less noise and air pollution
D. Uses more fossil fuel