Question

give me some extra questions which are not from ncert book of class 10 science especially for ch 13 ch 10 and ch 10

Answer 1

Chp 10 is important and most questions will come frm chp 10 and electricity and chp 13 i am not sure..

Answer 2

Answer :

Ch13:

Q)List in tabular form two major differences between an electric motor and a generator.

Q) A compass needle is placed near a current-carrying wire. State your observation for the
following cases, and give reason for the same in each case.

(a) Magnitude of electric current in the wire is increased.

(b) The compass needle is displaced away from the wire.

Q)Explain the role of fuse in series with any electrical appliance in an electric circuit. Why
should a fuse with defined rating for an electric circuit not be replaced by one with a larger rating?

Q)What is short circuiting? State one factor/condition that can lead to it. Name a device in the
household that acts as a safety measure for it. State the principle of its working.

Ch 10:

Q)(a) With the help of a ray diagram explain why a concave lens diverges the rays of a parallel beam
of light.

(b) A 2.0 cm tall object is placed perpendicular to the principal axis of a concave lens of focal length 15
cm. At what distance from the lens, should the object be placed so that it forms an image 10 cm from
the lens? Also find the nature and the size of image formed.

Q)(a) What is meant by ‘power of a lens’?

(b) State and define the S.I. unit of power of a lens.

(c) A convex lens of focal length 25 cm and a concave lens of focal length 10 cm are placed in close
contact with each other. Calculate the lens power of this combination.