EASY
7th CBSE
IMPORTANT
Earn 100
Nichrome is an alloy of lead and tin.
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Important Questions on Electric Current and Its Effects
EASY
7th CBSE
IMPORTANT
Electromagnets are used to produce permanent magnets.
EASY
7th CBSE
IMPORTANT
A fuse of higher current rating is used for electric oven.
EASY
7th CBSE
IMPORTANT
The magnetic strength in a conductor decreases with increase in current.
EASY
7th CBSE
IMPORTANT
Armature in an electric bell is a steel bar suspended in front of an electromagnet.
MEDIUM
7th CBSE
IMPORTANT
Match the statements in column A with those in column B.
| Column A | Column B |
| 1. A magnetic device used for finding geographic directions | (a) electromagnet |
| 2. A device which is essential in an electric bell | (b) magnetic needle |
| 3. A fuse used in expensive and sensitive devices | (c) fusible alloy |
| 4. An alloy used as a material of fuse wire | (d) cartridge fuse |
| 5. A material used for making the heating element of a toaster. | (e) tungsten |
| 6. A material used for making filament of a bulb | (f) nichrome |
| 7. A material which does not allow the electric current to pass. | (g) soft iron |
| 8. A material used for making electromagnets. | (h) wax |
EASY
7th CBSE
IMPORTANT
What is an electric circuit?
EASY
7th CBSE
IMPORTANT
Why are the household electric wires covered with plastic and rubber?
EASY
7th CBSE
IMPORTANT
What are electric elements? Draw the symbol of the electric element variable resistance.
