Simple Machine II - JSS2 Basic science Past Questions and Answers - page 1
1
What is a gear?
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A
A type of wheel
B
A simple machine with interlocking toothed wheels
C
A type of lever
D
A pulley system
2
How do gears change motion?
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A
By increasing temperature
B
By changing color
C
By meshing teeth and transmitting motion
D
By reducing friction
3
What is the purpose of gears?
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A
To create noise
B
To change speed, torque, or direction of motion
C
To reduce efficiency
D
To increase energy consumption
4
What is efficiency in the context of simple machines?
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A
The ability to generate heat
B
The ability to produce sound
C
The ability to perform a task with minimal energy waste
D
The ability to increase friction
5
How is efficiency typically expressed?
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A
As a ratio of output work to input work
B
As a ratio of output work to friction
C
As a ratio of output work to speed
D
As a ratio of output work to direction
6
What are some factors that affect the efficiency of machines?
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A
Friction, heat, and air resistance
B
Color, shape, and size
C
Material, weight, and temperature
D
Length, width, and height
7
What is a crucial aspect of caring for machines?
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A
Ignoring maintenance schedules
B
Improper use
C
Regular maintenance and proper handling
D
Storing machines in humid environments
8
What should operators avoid to prevent machine damage?
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A
Overloading and exceeding capacity
B
Using machines according to instructions
C
Providing regular maintenance
D
Storing machines in dry environments
9
Which of the following is NOT a recommended maintenance task for machines?
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A
Lubrication
B
Cleaning
C
Ignoring wear and tear
D
Inspection of parts
10
What should be provided to operators to ensure safe machine use?
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A
No training
B
No safety precautions
C
Proper ventilation in enclosed spaces
D
Wearing inappropriate protective gear
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