Nichrome is an alloy of lead and tin.

Important Questions on Electricity and Its Effects

EASY

7th CBSE

IMPORTANT

SCIENCE Class 7>Chapter 13 - Electricity and Its Effects>LET'S Learn And EVALUATE>Q 6

Electromagnets are used to produce permanent magnets.

EASY

7th CBSE

IMPORTANT

SCIENCE Class 7>Chapter 13 - Electricity and Its Effects>LET'S Learn And EVALUATE>Q 7

The armature is an electric device which is a steel bar suspended in front of an electromagnet.

MEDIUM

7th CBSE

IMPORTANT

SCIENCE Class 7>Chapter 13 - Electricity and Its Effects>LET'S Learn And EVALUATE>Q 1

Describe the merits and demerits of the heating effect of current.

HARD

7th CBSE

IMPORTANT

SCIENCE Class 7>Chapter 13 - Electricity and Its Effects>LET'S Learn And EVALUATE>Q 2

Explain the construction and working of an electric bell.

MEDIUM

7th CBSE

IMPORTANT

SCIENCE Class 7>Chapter 13 - Electricity and Its Effects>LET'S Learn And EVALUATE>Q 3

What is an ISI mark? What is its significance?

MEDIUM

7th CBSE

IMPORTANT

SCIENCE Class 7>Chapter 13 - Electricity and Its Effects>LET'S Learn And EVALUATE>Q 4

How can we increase the strength of an electromagnet?

MEDIUM

7th CBSE

IMPORTANT

SCIENCE Class 7>Chapter 13 - Electricity and Its Effects>LET'S Learn And EVALUATE>Q 5

What advantage does MCB have over an electric fuse?

MEDIUM

7th CBSE

IMPORTANT

SCIENCE Class 7>Chapter 13 - Electricity and Its Effects>HOTS>Q 1

An electrician wants to replace a fuse by a piece of nichrome wire. Is it safe?