CBSE Class 8 Science Electricity Magnetic and Heating Effects (Class 8 NCERT New) Quiz 9

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CBSE › Class 8 › Science › Electricity Magnetic and Heating Effects (Class 8 NCERT New)

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1. What materials are commonly used for the core of an electromagnet?

A Copper, aluminum, plastic B Lead, zinc, brass C Wood, glass, rubber D Iron, steel, ferrite

2. How does the voltage applied to an electromagnet influence its strength?

A Higher voltage decreases the current, weakening the electromagnet. B Higher voltage increases the current, which strengthens the electromagnet. C Lower voltage increases the strength of the electromagnet. D Voltage has no effect on the strength of an electromagnet.

3. Can an electromagnet be turned on and off? Why or why not?

A Yes, but only if it is made of permanent magnets. B No, electromagnets are always on and cannot be controlled. C Yes, an electromagnet can be turned on and off. D No, an electromagnet cannot be turned on and off because it requires a constant power supply.

Practice more on Electricity Magnetic and Heating Effects (Class 8 NCERT New)

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