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

Water in an electric kettle connected to a 220 V supply took 5 minutes to reach its boiling point. How long will it take if the supply voltage falls to 200 V?

The input and output voltages of a transformer are 220 V and 44V respectively. Find the current in input circuit if the output current is 2 A.

What does the unit kilowatt hour measure? Define it.

Define Kilo watt hour.

Express watt hour and kilowatt hour in joule.

What is the energy conversion when an electric current passes through a metallic wire?

Which cable, one rated 15A and the other rated 5A will be thicker? Give a reason.

What is electric power? State and define its S.I. unit.

State three factors on which the heat produced in a metallic wire due to passage of current in it depends.

An electric current is passed through a metallic wire. The wire gets heated up. Give the reason. Is it possible to melt the wire by passing a heavy current?

Why is heating coil wound in the form of a helix in electric stove?

What are the two main systems of wiring commonly used in houses? Which of these systems mentioned by you is better and why?

Point out two main disadvantages of ‘Tree System’.

Name three main characteristics of an heating element.

Mention three uses of the carbon arc.

Name two common material used for heating elements.

In an electric radiator or room heater, state with reason, why the porcelain tube wound with a nichrome wire is placed between the pole and principal focus of the parabolic concave reflector.

Why is heating element wound on a long porcelain rod in a room heater.

Why is a concave reflector placed behind the heating element in a room heater.

State the position of heating element with respect to principal focus of concave reflector and give reason for choosing this position.