Class 8 General Science Notes - Unit-10- Electricity and Magnetism ( Solved Exercise MCQs)

Unit-11- Electricity and Magnetism ( Solved Exercise MCQs)

(National Book Foundation - New Book/New Syllabus Based on National Curriculum Pakistan 2023-2024 and Onwards)

(Class 8 General Science Notes for 8th Centralized Exam 2023-2024 and onward, FDE, Islamabad)

A. MCQs (Choose the Correct Answers).

1. Which of the following energy conversions takes place in a battery-operated flashlight?

a. Electrical → mechanical → light
b. Chemical → mechanical → light
c. Chemical → electrical → light
d. Nuclear → electrical → light

... Answer is c. Chemical → electrical → light
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2. The unit of current is

a. coulomb.
b. volt
c. ohm.
d. ampere.

... Answer is d. ampere.
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3. Bulb is connected to voltage source, by increasing the voltage the brightness of the bub will

a. increase.
b. decrease.
c. reduce to zero.
d. stay the same.

... Answer is a.  increase.
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4. The primary purpose of a resistor is to

a. increase current.
b. limit current.
c. produce heat.
d. resist current change.

... Answer is b.  limit current.
---------------

5. The wire made from which of the following materials is a conductor

a. glass.
b. rubber.
c. gold.
d. silica.

... Answer is c. gold.
-----------------

6. The electric device which melts, if the current exceeds a certain fixed

a. circuit breaker.
b. fuses.
c. earth wires.​
d. copper wires.

... Answer is b. fuses.
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7. The device that is used to protect a circuit against overload is

a. heater
b. fuse.
c. lamp.
d. switch.

... Answer is b. fuse.
--------------------

8. To prevent the risk of electric shock the earth pin on a three-pin plug is connected to the part of the device

a. plastic part of the device.
b. neutral wire.
c. cable grip.
d. metal case.

... Answer is d.  metal case.
---------------

9. To increase the strength of the electromagnet the best core material should be

a. plastic.
b. rubber.
c. aluminum.
d. iron.

... Answer is d.  iron.
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10. An electromagnetic device which make of electromagnet is

a. resistor.
b. bulb.
c. doorbell.
d. three plug pin.

... Answer is c.  doorbell.
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