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

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?

Select the correct option:

A part of the longitudinal wave in which particles of the medium are closer than the normal particles is called:

Select the correct option:

A part of longitudinal wave in which particles of the medium are farther away than the normal particles is called :

Select the correct option:

In the region of compression or rarefaction, in a longitudinal wave, the physical quantity which does not change is:

State four characteristics of a standard unit.

Select the correct option:

If the frequency of a wave is 25 Hz. the total number of compressions and rarefactions passing through a point in 1 second is :

Select the correct option:

Which of the following is an elastic wave?

What do you understand by the term sound energy?

State three conditions necessary for hearing sound.