General Science 5th Class Chapter 7 Electricity and Magnetism Solved Exercise

General Science

5th Class

Chapter 7

Electricity and Magnetism

Questions

1. Encircle the correct option.

i. The flow of current in an electric circuit is controlled by:

a. bulb        b. copper wire        c. switch        d. rubber

ii. Current can easily pass through:

a. steel paper clip        b. glass strip        c. plastic comb        d. wooden spoon

iii. How many poles are there on a ring shaped magnet?

a. 1        b. 2        c. 3        d. 4

iv. A freely suspended bar magnet always stays along:

a. east-west direction        b. north-south direction

c. any direction        d. keeps oscillating

v. Which one is a true statement?

a. North pole attracts north pole        b. North pole repels north pole

c. South pole repels north pole        d. South pole attracts south pole

2. Write short answers.

i. Why does a bulb light up in a closed circuit?

Ans.

When we switch on, the circuit is completed and the current starts flowing which lights up the bulb.

ii. You are given a bulb. What other components are required to light it up?

Ans.

We required an electric wire of copper, a battery and a switch.

iii. Why does an iron nail stuck to a magnet attract another nail?

Ans.

When an iron nail stuck to a magnet, it has magnetic properties, due to this reason an iron nail attracts another nail.

iv. How are directions known using a magnet compass?

Ans.

Place the magnet compass on earth. It suspended North-South direction. Now rotate the compass even that it comes in of North-South directions. By this, we can find out direction of any place.

v. A balloon is charged by rubbing it with a woolen cloth. Why does it stick to a wall when brought near it?

Ans.

When we rub a balloon with woolen cloth it becomes charged, so it sticks to the wall.