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

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.

Waves produced on the surface of the water are formed to move with a velocity of 24 ms⁻¹. If the wavelength of these waves equals 20 cm. find the
(i) frequency (no. of waves produced per second)
(ii) the time period (i.e. the time required to produce one wave) for these waves.

(i) A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 ms⁻¹?
(ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?

A sound wavelength of 0.332 m has a time period of 10⁻³ s. If the time period is decreased to 10⁻⁴ s, calculate the wavelength and frequency of the new wave.

State three differences between heat and temperature.

Define the moment of a couple.

A ray of light is incident at 45° on an equilateral prism in the diagram below.

1. Name the phenomenon exhibited by the ray of light when it enters and emerges out of the prism.
2. State the cause of the above phenomenon mentioned by you.

Two identical marbles A and B are rolled down along Path 1 and Path 2 respectively.

Path 1 is frictionless and Path 2 is rough.

1. Which marble will surely reach the next peak?
2. Along which path/s the mechanical energy will be conserved?
3. Along which path/s is the law of conservation of energy obeyed?