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

A current of 0.2 A flows through a wire whose ends are at a potential difference of 20 V. Calculate the resistance of the wire.

A current of 0.2 A flows through a wire whose ends are at a potential difference of 20 V. Calculate the heat energy produced in 1 minute.

Which particles are responsible for current in conductors?

Which coil of a step up transformer is made thicker and why?

Name the transformer used in the power transmitting station of a power plant.

What type of current is transmitted from the power station?

1 kWh = ________ J

At what frequency is AC supplied to residential houses?

What is consumed using different electrical appliances, for which electricity bills are paid?

Name two factors on which the magnitude of an induced e.m.f. in the secondary coil depends.

How is the e.m.f. across primary and secondary coils of a transformer related with the number of turns of the coil in them?

On which type of current do transformers work?

Name two safety devices which are connected to the live wire of a household electric circuit

Why is the core of a transformer laminated?

Define watt-hour. How many joules are equal to 1 watt-hour?

Define kilowatt-hour. 

The frequencies of notes given by flute, guitar and trumpet are respectively 400 Hz, 200 Hz and 500 Hz. Which one of these has the highest pitch?

Write an expression for the electrical power spent in flow of current through a conductor in terms of
(a) Resistance and potential difference, (b) current and resistance.

Electrical power P is given by the expression P = (Q × V) ÷ time. What do the symbols Q and V represent?

Electrical power p is given by the expression P = (Q × V) ÷ time. Express the power P in terms of current and resistance explaining the meaning of symbols used there in.