EASY
7th Punjab Board
IMPORTANT
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The safety device based on the heating effect of electric current is called a .

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Important Questions on Electric Current and its Effects

EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 9
To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell.
EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 9
When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. 
EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 9
An electromagnet does not attract a piece of iron.
EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 9
An electric bell has an electromagnet.
EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 10
Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.
EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 11
An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response.
MEDIUM
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercise>Q 12

Zubeda made an electric circuit using a cell holder shown in the figure, a switch and a bulb. When she put the switch in the ‘ON’ position, the bulb did not glow. Help Zubeda in identifying the possible defects in the circuit.
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EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercise>Q 13
In the circuit shown in figure,
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Would any of the bulb glow when the switch is in the ‘OFF’ position?