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CBSE Worksheet-46

Class – VII Science (Electric Current and its Effects)

1. Electromagnet is based on

a. Heating effect of electric current

b. Magnetic effect of electric current

c. Chemical effect of electric current

d. Electro-chemical effect of electric current

2. Filament of electric bulb is made up of

a. Nichrome

b. Silver

c. Copper

d. Tungsten

3. MCB in electric circuit stand for

a. Minimum current breaker

b. Maximum current breaker

c. Miniature circuit breaker

d. Molar current breaker

4. Electric current is measured by a device

a. Voltmeter

b. Galvanometer

c. Ammeter

d. Odometer

5. Match the following

Column A Column B

a. Current i. Watt

b. Potential difference ii. Joule

c. Resistance iii. Ampere

d. Power iv. Ohm

e. Energy v. Volt

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6. Write T for true and F for false statements.

a. Electromagnet is used in electric fan.

b. When current flows through the conductor magnetic field is produced.

c. Galvanometer is used to measure voltage.

d. Chemical effect of electric current is used for electroplating.

e. Coil of heating devices are made up of good conductor.

7. What is electromagnetic effect of electric current?

8. What is electric current? How its flows?

9. Write difference between electromagnet and permanent magnet?

10. Rearrange the jumbled letters to form meaningful words related to Electricity.

a. RECURNT

b. BYATTRY

c. UFSE

d. CTROLENETMAG

e. ICRITUC

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Answer key

1. b

2. d

3. c

4. c

5. (a) – (iii), (b) – (v), (c) – (iv), (d) – (i), (e) – (ii).

6. (a) T (b) T (c) F (d) T(e) F.

7. When electric current flows through a conductor, magnetic field is produced around

the conductor. This effect of current is called magnetic effect of electric current.

8. The flow of current through a conductor is called electric current. Electron flows

through the conductor due to potential difference.

9. Electromagnet lose its magnetic property as soon as current is stopped flowing.

Permanent magnet does not require current to show magnetic effect. Strength of

electromagnet is more than permanent magnet.

10. Words related to electricity are:

a. CURRENT

b. BATTERY

c. FUSE

d. ELECTROMAGNET

e. CIRCUIT.