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

State two ways to increase the speed of rotation of a D.C. motor.

Is centrifugal force considered as the force of reaction of the centripetal force?

A battery o f e.m.f. 3 Vis connected in series with an ammeter, a 10 Ω coil of wire and with a parallel combination o f resistance of 3Ω and 6 Ω. Draw a circuit diagram for the above arrangement. What is the
(a) Resistance of the parallel combination?
(b) Reading on the ammeter?
( c) Potential difference across the 3Ω resistor?
( d) Current flowing through each resistor?

Name the material and type of wires for the following:
(a) Connecting wires for lighting
(b) Fuse wire
(c) Heating elements
(d) Connecting wires of a power line
(e) Earthing elements

What is meant by a ring circuit in house wiring?

 Out of the wires- live, neutral and earthing, on which line will you connect the fuse and the switch. Give reason for your answer.

State the sign convention to measure the distances for a lens.

Live wire is also called ______ wire.

To which wire is the metallic case of an electric appliance connected? Give the reason? 

Name the colour code of the wire which is connected to metallic body of an appliance.

How does the colour code of wires in a cable help in house wiring?

State Fleming’s left-hand rule.

A flat coil ABCD is freely suspended between the pole of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field. 

When will coil come to rest?

A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.

When will the couple acting on the coil be

1. maximum
2. minimum?

A flat coil ABCD is freely suspended between the pole of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.

Name an instrument which makes use of the principle stated above.

A radioactive source emits three types of radiations.

Name the radiation which is most penetrating.