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

Describe an experiment to show that in wave motion, only energy is transferred, but particles of medium do not move.

If you place your ear close to an iron railing which is tapped some distance away, you hear the sound twice. Explain why?

How does the speed of sound change with change in (i) amplitude and (ii) wavelength, of sound wave? 

How does the following factor affect, if at all, the speed of sound in air:

Frequency of sound

How does the following factor affect, if at all, the speed of sound in air:

Temperature of air

How does the following factor affect, if at all, the speed of sound in air:

Pressure of air

How does the following factor affect, if at all, the speed of sound in air:

Moisture in air

Complete the following sentence :

A longitudinal wave is composed of  compression and ____________.

Complete the following sentence :

A transverse wave is composed of crest and ____________. 

The correct statement is :

A longitudinal wave travels at a speed of 0.3 m s^-1 and the frequency of wave is 20 Hz. Find the separation between two consecutive compressions. 

Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams. 

What is a lodestone? 

What is a natural magnet? State two limitations of a natural magnet. 

What is an artificial magnet? State two reasons why do we need artificial magnets .

How will you test whether a given rod is made of iron or copper?

[Hint : Iron rod gets magnetised when placed near a bar magnet by magnetic induction, while copper rod does not get magnetised]

Explain what you understand by magnetic induction. What role does it play in attraction of a piece of iron by a magnet?