(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

State the principle on which SONAR is based.

Two blocks P and Q of different metals having their mass in the ratio 2 : 1 are given same amount of heat. Their temperature rises by same amount. Compare their specific heat capacities.

Give one example where high specific heat capacity of water is used as heat reservoir.

Calculate the amount of heat energy required to raise the temperature of 200 g of copper from 20°C to 70°C. Specific heat capacity of copper = 390 J kg^-1 K^-1.

State the couple's effect on a body.

Define kilowatt hour.

Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation.

When does the nucleus of an atom tend to become radioactive?

A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.

A pulley system with VR = 4 is used to lift a load of 175 kgf through a vertical height of 15 m. The effort required is 50 kgf in the downward direction. (g = 10 N kg^-1)

Calculate:

1. Distance moved by the effort
2. Work done by the effort
3. M.A. of the pulley system
4. Efficiency of the pulley system

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)

State the dependence of angle of deviation on the refractive index of the material of the prism.