(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

Derive the equation
S = ut+ `1/2` at²
Using a speed- time graph

Draw the distance-time graphs of the bodies P and Q starting from rest, moving with uniform speeds with P moving faster than Q.

Figure shows the distance-time graph of three students A, B and C. On the basis of the graph, answer the following :

Which of the three is traveling the fastest?

Figure shows the distance-time graph of three students A, B and C. On the basis of the graph, answer the following :

Will the three ever meet at any point on the road?

Figure shows the distance-time graph of three students A, B and C. On the basis of the graph, answer the following :

When B meets A, where is C?

Figure shows the distance-time graph of three students A, B and C. On the basis of the graph, answer the following :

How far did B travel between the time he passed C and A?

(i) In speed time graph uniform motion is given by a straight line parallel to x axis so figure (a) denotes the uniform motion.
(ii) In speed time graph motion with increasing speed is shown by straight line with positive slope so figure (c) denotes the motion with speed increasing.
(iii) In speed time graph motion with decreasing speed is shown by straight line with negative slope so figure (b) denotes the motion with speed decreasing.
(iv) In speed time graph motion with oscillating speed is shown by zigzag line so figure {d) denotes the motion with speed oscillating.

Name the instrument which can accurately measure the following

The diameter of a needle

Name the instrument which can accurately measure the following

The thickness of a paper

Name the instrument which can accurately measure the following

The diameter of a pencil.

Name the instrument which has the least count

0.01 mm

Explain the following term:

Incident ray

Draw diagram/diagrams to show them. 

State the number of images of an object placed between two mirrors, formed in each case when mirrors are inclined to each other at (a) 90°, and (b) 60°.

What is a spherical mirror? 

Name the two kinds of spherical mirrors and distinguish between them. 

Define the terms pole, principal axis and centre of curvature with reference to a spherical mirror. 

Draw suitable diagrams to illustrate the action of (i) concave mirror and (ii) convex mirror on a beam of light incident parallel to the principal axis. 

Name the spherical mirror which (i) diverges (ii) converges the beam of light incident on it. Justify your answer by drawing a ray diagram in each case. 

Define the terms focus and focal length of a concave mirror. Draw diagram to illustrate your answer.