HARD
7th CBSE
IMPORTANT
Earn 100

What is a solenoid? Draw a diagram with a solenoid connected in a circuit. How can you increase the strength of solenoid?

Important Questions on Electric Current and its Effects

MEDIUM
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 14 - Electric Current and its Effects>Exercise>Q 2
Give two advantages of electromagnets over a permanent magnet. What type of magnet is used in an electric bell?
HARD
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 14 - Electric Current and its Effects>Exercise>Q 2

Draw a labelled diagram of an electric bell.

MEDIUM
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 14 - Electric Current and its Effects>Exercise>Q 3
What is overloading? Why is a fuse wire necessary in a circuit? How does it work?
EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 14 - Electric Current and its Effects>Exercise>Q 1
Why can’t we use a copper wire for making an electric fuse?
EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 14 - Electric Current and its Effects>Exercise>Q 2
A coil suspended freely, points in some direction when no current is passed through it. Can you tell what will happen when a current is passed through it?
EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 14 - Electric Current and its Effects>Exercise>Q 1

Why does the bulb in the circuit given alongside in figure not glow? Draw the circuit with required change.

Question Image

EASY
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 14 - Electric Current and its Effects>Exercise>Q 1
Look at the figures given below and answer the following questions:
Question Image

Which one is a stronger magnet among the Fig. (i) and (ii) given above and why?
MEDIUM
7th CBSE
IMPORTANT
LEARNING SCIENCE>Chapter 14 - Electric Current and its Effects>Exercise>Q 1
Look at the figures given below and answer the following questions:
Question Image

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