(English Medium) ICSE Class 10 - CISCE Important Questions for Physics

Water freezes to form ice. What change would you expect in the average kinetic energy of the molecules?

What mass of ice at 0°C added to 2.1 kg water, will cool it down from 75°C to 25°C? Given Specific heat capacity of water = 4.2 Jg^-1 °C^-1, Specific latent heat of ice = 336 Jg^-1.

Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.

A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X

Answer the following questions based on a hot cathode ray tube

Name the charged particles

Answer the following questions based on a hot cathode ray tube.

State the approximate voltage used to heat the filament

Answer the following questions based on a hot cathode ray tube.

What will happen to the beam when it passes through the electric field?

State three factors on which the rate of emission of electrons from a metal surface depends

What are free electrons?

Why do Free electrons not leave the metal surface on their own

How can they be made to leave the metal surface? (State any two ways)

An element `""_ZS^A` decays to `""_85R^222` after emitting 2 α particles and 1 β particle.

Find the atomic number and atomic mass of the element S.

A radioactive substance is oxidized. Will there be any change in the nature its radioactivity? Give a reason for your answer

Arrange α, β, and γ rays in ascending order with respect to their

1) Penetrating power.

2) Ionising power

3) Biological effect

In a cathode ray tube, what is the function of anode?

State the energy conversion taking place in a cathode ray tube

Write one use of cathode ray tube.

Represent the change in the nucleus of a radioactive element when a β particle is emitted.

Under which conditions does the nucleus of an atom tend to radioactive?

Why is a cathode ray tube evacuated to a low pressure?