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

Fig . shows the essent ial features of a battery operated bell. The hammer strikes the gong when the swi tch is closed . State and explain the effect of using the following material successively to form the core.

(a) Plastic
(b) Steel
(c) Copper

The diagram shows a coil connected to a center zero galvanometerG . The galvanometer shows a deflect ion to the right when the north pole N of a powerful magnet is moved to the right as shown .

(i) Explain, why the defelct ion occurs in the galvanometer.
(ii ) State whether th e current in the coil is cl ockwise or anticl ockwise
when viewed from the end P.
(iii ) State th e observation in G when the coil is moved away from north
pole N of the magnet keeping the magnet stationary.
(iv)State the observation in G when both the coil and the magnet are
moved to right at th e same speed .

Name the physical quantity which is measured in kW.

An electric bulb of resistance 500 Ω draws current 0.4 A from the source. Calculate:

1. the power of bulb and
2. the potential difference at its end.

Two resistors A and B of 4 Ω and 6 Ω respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate the power supplied by the battery.

Two resistors A and B of 4 Ω and 6 Ω, respectively are connected in parallel. The combination is connected across a 6 volt battery of negligible resistance. Calculate the power dissipated in each resistor.

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’.