(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

What are infrasonic waves?

Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves, and thermal radiation, the energy is propagated by mechanical waves.

Write the approximate value of the speed of sound in air.

Write the approximate value of the speed of sound in water.

Write the approximate value of the speed of sound in iron.

Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.

What is meant by echo depth sounding?

Why will an echo not be heard when the distance between the source of the sound and the reflecting surface is 10 m?

How are bats able to fly in the dark?

What do you understand by the ‘Echolocation system of Dolphins’?

What are fishing boats?

State two factors on which the natural frequency of a body depends.

A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?

A type of electromagnetic wave has a wavelength of 50 Å. Name the wave and state one use of this type of wave.

Name the type of waves that are used for sound ranging. Why are radio waves not audible to us?

When a sound is made from a distance of 18 m, in front of a tall building, it is found to get repeated again. Which phenomenon is associated with this observation? Give a brief explanation of this phenomenon?

Why is an echo not heard when the distance between the source of sound and reflection body is less than 10 m?

Draw a diagram representing a wave of amplitude 4 cm and wavelength 2 m. If the frequency of the wave is 150 Hz, calculate its velocity.

In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.

A radio signal, sent towards the surface of the moon, is received in 2.5 seconds. If the speed of the radio waves is 3 × 10⁸ ms⁻¹, find the distance of the moon from the earth.