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7th Punjab Board
IMPORTANT
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When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Important Questions on Electric Current and its Effects

EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 7
Will the compass needle show deflection when the switch in the circuit shown by the figure is closed?
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EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 8
Longer line in the symbol for a cell represents its _____ terminal.
EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 8
The combination of two or more cells is called a _____.
EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 8
When a current is switched ‘on’ in a room heater, it _____.
(Choose one of the following: produces heat/ produces wind).
EASY
7th Punjab Board
IMPORTANT
Science>Chapter 14 - Electric Current and its Effects>Exercises>Q 8
The safety device based on the heating effect of electric current is called a _____.
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.