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