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

State two advantages and two disadvantages of the reflecting periscope.

Write down four characteristics of image formed in a plane mirror.

How many images will be formed when an object is placed between two parallel plane mirrors with their reflecting surfaces facing each other? Why do more distant images appear fainter?

Describe the principle of simple periscope through an outline ray diagram. Give one of its uses.

Draw diagrams to show the difference between regular and irregular reflection.

An object is placed 2 cm from a plane mirror. If the object is moved by 1 cm towards the mirror, what will be the distance between the object and its new image?

An object 3 cm high produces a real image 4.5 cm high when placed at a distance of 20 cm from a concave mirror. Calculate:

1. the position of image
2. focal length of the concave mirror.

An object 1.5 cm high when placed in front of a concave. the mirror produces a virtual image 3 cm high. If the object is placed at a distance of 6 cm from the pole of the mirror, calculate:

1. the position of the image
2. the focal length of the mirror.

A converging mirror, forms three times magnified virtual image when an object is placed at a distance of 8 cm from it. Calculate:

1. the position of the image
2. the focal length of the mirror.

The base of the cylindrical vessel measures 300 cm². Water is poured into it up to a depth of 6 cm. Calculate the pressure of water on the base in the vessel.

Pressure in a water pipe on the ground floor of a building is 100,000 Pa. Calculate the pressure in the water pipe on the first floor at a height of 3 m. [Density of water = 1000 kgm⁻³ ; g = 10 ms⁻²]

Copy the figure. By taking two rays from point A, show the formation of image. State four characteristics of the image.

A beaker contains a liquid of density ‘ρ’ up to height ‘h’ such that ‘P_A’ is atmospheric pressure and ‘g’ is the acceleration due to gravity. Answer the following questions:

1. What is the pressure on the free surface of the liquid?
2. What is the pressure on the base of the beaker?
3. What is the lateral pressure at the base on the inner walls of the beaker?

Draw a neat two ray diagram to illustrate how a concave mirror is used as a shaving mirror.

Calculate the hydrostatic pressure exerted by water at the bottom of a beaker. Take the depth of water as 40 cm, the density of water 1000 kgm⁻³ and g = 9.8 ms⁻².

Copy the figure. By taking two rays from point A, show the formation of image. State four characteristics of the image.

Why do automobile drivers prefer convex mirror as a rear vew mirror? Illustrate your answer.

Give two uses of convex mirror.

Give two uses of concave mirror.

You are provided a convex mirror, a concave mirror and a plane mirror. How will you distinguish between them, without touching or using any other apparatus?