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

What is the SI unit of frequency?

Define one hertz.

What type of sound is produced by elephants and whales?

What do you mean by an echo?

What is echolocation? How do animals make use of this phenomenon?

Name the Sound of the Frequency Given Below:
200 Hz

When a ray of light strikes a plane mirror at an angle of 150 with the mirror, what will be the angle through which the ray will deviate? Illustrate with a ray diagram in the following figure.

The word PLATE written on a paper is held in front of a plane mirror. Write down the letters as seen in the following case.
The paper is held parallel to the mirror.

The word PLATE written on a paper is held in front of a plane mirror. Write down the letters as seen in the following case.
The paper is held perpendicular to the mirror.

Complete the ray diagram to show the image observed by the eye after reflection in the following figure.

Complete the ray diagram to show the image observed by the eye after reflection in the following figure.

Locate the image termed when the object is placed between two planes as shown in the following figure.

Locate the image termed when the object is placed between two planes as shown in the following figure.

Define the term Principle axis.

Complete the path of incident ray in the following case.

Complete the path of incident ray in the following case.