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

Why is water used as a coolant in radiators of a car?

Specific heat capacity of a substance X is 1900 Jkg^-1°C^-1 means ______.

Thermal capacities of substances A and B are same. If mass of A is more than mass of B then:

Which substance will have more specific heat capacity?

Calculate the distance covered by the Ultrasonic wave having a velocity of 1.5 kms^-1 in 14 s, when it is received after reflection by the receiver of the SONAR.

Name the class of the lever shown in the picture below:

Name the waves used in SONAR.

A ______ lever will always have M.A. > 1.

Give one reason for the use of ultrasonic waves in echo depth sounding.

Classify the following into levers:

Claw hammer

Classify the following into levers:

Sugar tongs

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.

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