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

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?

The blood pressure reading of a patient is recorded 160/100. Express the lower pressure in SI units.
[Take density of mercury as 13.6 × 10³ kgm⁻³ and the value of ‘g’ as 10 ms⁻²]

Compare the characteristics of an image formed by a convex mirror and a concave mirror, when object is beyond center of curvature, but not at infinity.

What is a real image?

Does the mirror named by you above give real images for all locations of object?

In the figure is shown a concave mirror. A is a point on the principal axis. If an object O is kept at A, image is formed on A itself. Copy the diagram. Draw the image in the diagram. Is the image real or virtual?

Measure the distance PA and write it in the diagram. What is the distance PA called?
Mark a point B on the principal axis, at which, if a point source of light is kept, the rays travel parallel to principal axis after reflection from M. What is point B called?

Fill in the blank:

The unit is which we measure the quantity is called ________.

An object OA is placed on the principal axis of a concave mirror as shown in the figure. Copy and complete the diagram to show the formation of image.

Copy the figure and complete it, by drawing two rays to show the formation of the image of the object AB. State the size, position and nature of image formed.

Select the correct option:

In case of longitudinal waves, the particles of the medium vibrate:

Select the correct option:

A longitudinal wave consists of:

Select the correct option:

The longitudinal waves can propagate only in

What do you understand by the term measurement?