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

A refrigerator converts 100 g of water at 20°C to ice at -10°C in 35 minutes. Calculate the average rate of heat extraction in terms of watts.

Given: Specific heat capacity of ice = 2.1 J g^-1°C^-1

Specific heat capacity of water = 4.2 J g^-1°C^-1

Specific latent heat of fusion of ice = 336 J g^-1

50 g of metal piece at 27°C requires 2400 J of heat energy so as to attain a temperature of 327°C . Calculate the specific heat capacity of the metal.

Heat energy is supplied at a constant rate to 100g of ice at 0 °C. The ice is converted into water at 0° C in 2 minutes. How much time will be required to raise the temperature of water from 0 °C to 20 °C? [Given: sp. heat capacity of water = 4.2 J g^-1 °C^-1, sp. latent heat of ice = 336 J g^-1].

Specific heat capacity of substance A is 3.8 J g^-1K^-1 whereas the  specific heat capacity of substance B is 0.4 J g^-1 K^-1
(i) Which of the two is a good conductor of heat?
(ii) How is one led to the above conclusion?
(iii) If substances A and B are liquids then which one would be more useful in car radiators?

A liquid X has the maximum specific heat capacity and is used as a coolant in Car Radiators. Name the liquid X.

A solid metal weighing 150 g melts at its melting point of 800 °C by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal?

Heat supplied to a solid change it into liquid. What is this change in the phase called?

During the phase change does the average kinetic energy of the molecules of the substance increase?

Give a mathematical relation between Heat Capacity and Specific Heat Capacity.

The temperature of 170 g of water at 50°C is lowered to 5°C by adding a certain amount of ice to it. Find the mass of ice added.

Given: Specific heat capacity of water = 4200 J kg^-1 °C^-1 and specific latent heat of ice = 336000 J kg^-1.

The diagram shows a coil wound around a U shape soft iron bar AB.

1) What is the polarity induced at the ends A and B when the switch is pressed?

2) Suggest one way to strengthen the magnetic field in the electromagnet

3) What will be the polarities at A & B if the direction of current is reversed in the circuit?

Name the three classes of levers and state how are they distinguished. Give two examples of each class.

Give one example of a class I lever where mechanical advantage is less than 1.

What is the use of the lever if its mechanical advantage is

1. more than 1,
2. equal to 1, and
3. less than 1?

Both a pair of scissors and a pair of pliers belong to the same class of levers. Name the class of lever. Which one has the mechanical advantage less than 1?

Explain why scissors for cutting cloth may have blades longer than the handles, but shears for cutting metals have short blades and long handles.

Which type of lever has a mechanical advantage always more than one? Give one example. What change can be made in this lever to increase its mechanical advantage?

Explain why the mechanical advantage of a class II of lever is always more than 1.

Draw a labelled diagram of a class II lever. Give one example of such a lever.

Explain why the mechanical advantage of the class III type of lever is always less than 1.