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

How long will sound take to travel in (a) and iron rail and (b) air, both 3.3 km in length? Take speed of sound in air to be 330 m/s and in iron to be 5280 m/s.

Assuming the speed of sound in air equal to 340 m/s and in water equal to 1360 m/s, find the time taken to travel a distance 1700 m by sound in (i) air (ii) water.

Fill in the blank to complete the sentence :

The two ends of a magnet are called __________.

Fill in the blank to complete the sentence :

Unlike poles of a magnet ___________ each other.

Fill in the blank to complete the sentence :

Like poles of a magnet ______________ each other.

Fill in the blank to complete the sentence :

A freely suspended magnet rests in the geographic ___________ direction.

Define heat energy on a conventional basis.

Define heat energy on the basis of kinetic theory of matter.

Define temperature on a conventional basis.

Define temperature on the basis of the kinetic theory of matter.

Define calorie. How many joules make one calorie?

A body absorbs 1680 J of heat energy. How many calories of heat is absorbed by the body?

A body radiates out 300 calories of heat energy. How much heat energy is radiated out by the body in joules?

Explain, why are the taps left dripping in sub-zero temperatures during winter?

Describe an experiment to prove that a material medium is necessary for the propagation of sound.

How do you account for the following fact?

Iron becomes magnetized when placed in a coil carrying direct current.

How do you account for the following fact?

Bar magnets lose their magnetism when heated strongly.