Electrical Systems - JSS2 Basic technology Past Questions and Answers - page 1
1
What distinguishes AC (Alternating Current) from DC (Direct Current) in electrical systems?
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A
AC flows in one direction, while DC flows in both directions.
B
AC flows in both directions periodically, while DC flows in one direction.
C
AC is used in electronics, while DC is used in homes.
D
AC is more efficient for short-distance transmission, while DC is for long distances.
2
Which component controls the flow of electricity in electrical systems?
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A
Wires
B
Resistors
C
Switches
D
Capacitors
3
What is the primary function of wires in electrical systems?
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A
Control electricity flow
B
Store electrical energy
C
Conduct electricity
D
Convert electrical energy into mechanical energy
4
Where are AC electrical systems commonly used due to efficient transmission?
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A
Electronic devices
B
Homes and businesses
C
Industrial machinery
D
Transportation systems
5
Which type of current is typically used in electronics and portable devices?
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A
AC
B
DC
C
Both AC and DC
D
None of the above
6
What do circuits in electrical systems primarily consist of?
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A
Wires only
B
Switches only
C
Pathways for electricity flow
D
Mechanical components
7
What role do resistors play in electrical circuits?
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A
Control voltage levels
B
Convert AC to DC
C
Store electrical energy
D
Control the flow of electricity
8
Which industry relies heavily on electrical systems for driving machinery and controlling processes?
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A
Automotive
B
Agriculture
C
Information technology
D
Manufacturing
9
What is the primary purpose of capacitors in electrical circuits?
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A
To control voltage spikes
B
To store electrical energy
C
To convert AC to DC
D
To amplify electrical signals
10
Why is AC preferred over DC for long-distance transmission?
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A
AC has lower voltage
B
AC is easier to convert to DC
C
AC can be easily stored
D
AC has lower energy losses
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