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

The image formed by a plane mirror is :

A man standing in front of a plane mirror finds his image at a distance 6 metre from himself. What is the distance of man from the mirror? 

An insect is sitting in front of a plane mirror at a distance 1 m from it. 
(a) Where is the image of the insect formed?

An insect is sitting in front of a plane mirror at a distance 1 m from it.
(b) What is the distance between the insect and its image?

An object is kept at 60 cm in front of a plane mirror. If the mirror is now moved 25 cm away from the object, how does the image shift from its previous position? 

An optician while testing the eyes of a patient keeps a chart of letters 3 m behind the patient and asks him to see the letters on the image of chart formed in a plane mirror kept at distance 2 m in front of him. At what distance is the chart seen by the patient? 

Two plane mirrors are placed making an angle θ in between them. Write an expression for the number of images formed of an object placed in between the mirrors. State the condition, if any. 

Two plane mirrors are placed making an angle θ° in between them. For an object placed in between the mirrors, if angle is gradually increased from 0° to 180°, how will the number of images change : increase, decrease or remain unchanged?

How many images are formed for a point object kept in between two plane mirrors at right angles to each other? Show them by drawing a ray diagram. 

Two plane mirrors are arranged parallel and facing each other at some separation. How many images are formed for a point object kept in between them? Show the formation of images with the help of a ray diagram 

State two uses of a plane mirror. 

Two plane mirrors are placed making an angle 60° in between them. For an object placed in between the mirrors, the number of images formed will be :

In the barber's shop, two plane mirrors are placed :

An object is placed (i) asymmetrically (ii) symmetrically, between two plane mirrors inclined at an angle of 50°. Find the number of images formed.

Electromagnets are made up of :

The strength of the electromagnet can be increased by

Name the material used for preparing an electromagnet.

How is an electromagnet made? Name two factors on which the strength of magnetic field of the electromagnet depends.

You are required to make an electromagnet from a soft iron bar by using a cell, an insulated coil of copper wire and a switch.

1. Draw a circuit diagram to represent the process.
2. Label the poles of the electromagnet.

The following figure shows a coil wound around a soft iron bar XY.

1. State the polarity at the ends X and Y as the switch is pressed.
2. Suggest one way of increasing the strength of electromagnet so formed.