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

A transformer lowers e.m.f. 220 V to 12 volts. If the number of turns in primary are 8800, how many turns are in secondary coil?

A transformer lowers e.m.f. from 220 V to 15 V. If 400 W power is given in primary, calculate (i) the current in primary coil and (ii) the current in secondary coil.

A transformer lowers e.m.f. from 220 V to 15 V. If the number of turns in primary are 3520, how many turns are in the secondary coil?

Name one electrical device which works on Faraday's law of electromagnetic induction principle.

A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V Write Yes or No. Give supporting calculations to justify your answer.

Water freezes to form ice. What change would you expect in the average kinetic energy of the molecules?

1 kWh = ______ J.

For what purpose are the transformers used?

How do the input and output powers in a transformer compare? State the assumption made.

Define the term kilowatt-hour and state its value in S.I unit

The temperature of the surrounding starts falling when ice in a frozen lake starts melting. Give reason.

What do you mean by power rating of an electrical appliance? How do you use it to calculate the resistance of the appliance.

What do you mean by power rating of an electrical appliance? How do you use it to calculate the safe limit of current in it, while in use?

An electrical appliance has a rating 100 W, 120 V. The resistance of element of appliance when in use is ______.

State one advantage of using a total reflecting prism as a reflector in place of plane mirror. 

Explain the meaning of the statement ‘the power of an appliance is 100 W’.

An electrical appliance having a resistance of 200 Ω  is operated at 200 V. Calculate the energy consumed by the appliance in 5 minutes in joules.

'A geyser is rated 240 W-220 V'. Explain the meaning of this statement.

Draw a diagram of a right angled isosceles prism which is used to make an inverted image erect.

State and define the household unit of electricity.