EASY
7th CBSE
IMPORTANT
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Why is a fuse wire necessary in a circuit? How does it work?

Important Questions on Electric Current and Its Effects

EASY
7th CBSE
IMPORTANT
Exploring Science BASED ON THE LATEST NCF GUIDELINES 7>Chapter 14 - Electric Current and Its Effects>Exercise>Q J

Which one is a stronger magnet among the Fig. (i) and (ii) and why?

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EASY
7th CBSE
IMPORTANT
Exploring Science BASED ON THE LATEST NCF GUIDELINES 7>Chapter 14 - Electric Current and Its Effects>Exercise>Q J

Look at the figures given alongside and answer the following question.

Why do we use an iron rod for making an electromagnet and not a steel rod?  

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EASY
7th CBSE
IMPORTANT
Exploring Science BASED ON THE LATEST NCF GUIDELINES 7>Chapter 14 - Electric Current and Its Effects>Exercise>Q J
Why can't we use a copper wire for making an electric fuse?
EASY
7th CBSE
IMPORTANT
Exploring Science BASED ON THE LATEST NCF GUIDELINES 7>Chapter 14 - Electric Current and Its Effects>Exercise>Q K
A coil is suspended freely. What will happen when a current is passed through it?
HARD
7th CBSE
IMPORTANT
Exploring Science BASED ON THE LATEST NCF GUIDELINES 7>Chapter 14 - Electric Current and Its Effects>Exercise>Q L
Why does the bulb in the circuit given below not glow? Also, draw the circuit with required change.

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HARD
7th CBSE
IMPORTANT
Exploring Science BASED ON THE LATEST NCF GUIDELINES 7>Chapter 14 - Electric Current and Its Effects>Exercise>Q 1
Why are Compact Fluorescent Lamps (CFLs) preferred over electric bulbs? 
EASY
7th CBSE
IMPORTANT
Exploring Science BASED ON THE LATEST NCF GUIDELINES 7>Chapter 14 - Electric Current and Its Effects>Exercise>Q 2
Why is an electric fuse required in all electrical appliances?
EASY
7th CBSE
IMPORTANT
Exploring Science BASED ON THE LATEST NCF GUIDELINES 7>Chapter 14 - Electric Current and Its Effects>Exercise>Q 3
Can we use the same fuse in a geyser and a television set? Explain.