What is an electric fuse? What is its function?

Important Questions on Electric Current and Simple Circuits

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 16 - Electric Current and Simple Circuits>ASSESSMENT ZONE>Q F

Name some appliances in which electromagnets are used.

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 16 - Electric Current and Simple Circuits>ASSESSMENT ZONE>Q F

How short-circuit occurs in an electric fuse?

MEDIUM

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 16 - Electric Current and Simple Circuits>ASSESSMENT ZONE>Q G

Give reasons of the following:
MCB is better than electric fuse.

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 16 - Electric Current and Simple Circuits>ASSESSMENT ZONE>Q G

Give reasons:
Tin-lead alloy is used to make fuse.

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 16 - Electric Current and Simple Circuits>ASSESSMENT ZONE>Q G

Explain the factors on which heating effect of electric current depends.

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 16 - Electric Current and Simple Circuits>ASSESSMENT ZONE>Q G

Draw a basic circuit diagram by using-a cell, a bulb, connecting wires and a switch.

EASY

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 16 - Electric Current and Simple Circuits>ASSESSMENT ZONE>Q G

What is an electromagnet and how is it made? Name the factors which help in changing the strength of an electromagnet.

MEDIUM

7th CBSE

IMPORTANT

Expanded Universal Science 7>Chapter 16 - Electric Current and Simple Circuits>ASSESSMENT ZONE>Q G

Why is a copper wire not used in the filament of a bulb? What will happen if we use a thick tungsten wire in an electric bulb?