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

An electric toaster draws current 8 A in a circuit with source of voltage 220 V. It is used for 2 h. Find the cost of operating the toaster if the cost of electrical energy is ₹ 4.50 per kWh.

An electric toaster draws current 8 A in a circuit with source of voltage 220 V. It is used for 2 h. Find the cost of operating the toaster if the cost of electrical energy is ₹ 4.50 per kWh.

State three actions that a total reflecting prism can produce.

Give any two important sources of background radiation.

What is mean by background radiation?

1. Define pitch.
2. Two wires AB and CD of same length are stretched by same amount. Which wire will produce a sound of greater pitch on plucking?
3. Give a reason for your answer.

Name one internal source of background radiations.

Complete the path of ray PQ through the glass prism ABC shown in Fig. till it emerges out of the prism. Given the critical angle of the glass is 42°.

Name the physical quantity which is measured in kWh.

Name the physical quantity which is measured in kWh.

Name the physical quantity which is measured in Wh.

Name the physical quantity which is measured in Wh.

A bulb of power 60 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.

A bulb of power 60 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.

The diagram below shows a magnetic needle kept just below the conductor AB which is kept in North South direction.

1. In which direction will the needle deflect when the key _is closed?
2. Why is the deflection produced?
3. What will be the change in the deflection if the magnetic needle is taken just above the conductor AB?
4. Name one device which works on this principle.

Name two sources of background radiations.

Is it possible for us to keep ourselves away from background radiations?

Draw a diagram to show one such action of the total reflecting prism.

Give two similarities an AC generator and a DC motor

Two musical notes of the same pitch and same loudness are played on two different instruments. Their wave patterns are as shown in following Figure.

Explain why the wave patterns are different.