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

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.

Give two differences between the radioactive decay and nuclear fission.

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.

What is the voltage of the electricity that is generally supplied to a house?

Two lamps, one rated 220 V, 50 W and the other rated 220 V, 100 W, are connected in series with mains of 220 V. Explain why does the 50 W lamp consume more power.

What is the resistance, under normal working conditions, of an electric lamp rated at '240 v, 60 W' ? If two such lamps are connected in series across a 240 V mains supply, explain why each one appears less bright.

Two bulbs are rated 60 W, 220 V and 60 W, 110 V respectively. Calculate the ratio of their resistances.

Sumit does 600 J of work in 10 min and Amit does 300 J of work in 20 min. Calculate the ratio of the powers delivered by them.

Three heaters each rated 250 W, 100 V are connected in parallel to a 100 V supply. Calculate:

1. the total current taken from the supply
2. the resistance of each heater and
3. the energy supplied in kWh to the three heaters in 5 hours.

A ball is placed on a compressed spring. What form of energy does the spring possess? On releasing the spring, the ball flies away. Give a reason.