(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

How do you account for the following fact?

Steel makes better permanent magnet than soft iron.

Describe various methods of magnetising a piece of iron.

What is magnetic induction?

Explain a suitable experiment of magnetic induction?

A magnet is carefully broken into two halves along its long axis as shown in the figure. How would the magnetic strength of each piece compare with that of the original magnet?

A magnet is carefully broken into two equal pieces as shown in the figure. How would the magnetic field strength of each piece compare with that of the original magnet? 

A conductor B is charged by bringing another charged body A in contact 

What will be the charge gained by B?

A conductor B is charged by bringing another charged body A in contact 

Explain the process of charging B.

Explain, what is meant by magnetic induction.

How would you test whether a piece of steel was magnetised
(i) If you had a magnet?
(ii) If there was no magnet available.

Give scientific reason:

A ' cracking' noise may be heard on removing a nylon shirt, blouse, or stockings.

Give scientific reason:

A charge can be obtained on a rubbed ebonite rod held in the hand but not on a rubbed metal rod held in the hand.

Can sound propagate in solids and liquids?

What is the approximate value of the speed of sound in air at N.T.P.?

Does the speed of sound in a gas depend on the pressure of the gas?

What are the requisites of the medium for the propagation of sound? Briefly, explain them.

Explain the effect of density on the speed of sound.