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

Give a reason, why the violet colour of white light deviated most and red colour of white light deviated least.

What is understood by the term dispersion of light? What is its cause?

Name the radiation of a wavelength longer than 8 × 10⁻⁷ m.

Explain, why quartz prism is required for obtaining the spectrum of ultra-violet light?

A prism causes dispersion of white light while a rectangular glass block does not. Explain.

Draw a neat diagram to show the arrangement you would use to project a pure spectrum of white light on a screen.

Comment on the statement: ‘When any ray of white light is incident on a glass prism, it simply disperses it into its seven constituent colours.

What is sound? What causes it to produce?

How is sound perceived by us?

Define sound ranging.

Arrange the speeds of sound in gases, solids, and liquids in ascending order.

The speed of sound is more in hydrogen than in nitrogen. Is this statement true? Give a reason for your answer.

What is musical sound? Give an example.

A cannon is fired at A (see diagram). An observer at B hears two sounds. The first sound is heard after 1 second and the second 3s after the observer sees the flash. (Velocity of sound = 340 ms⁻¹)
(i) Why does the observer see the flash before he hears the sound?
(ii) Calculate the distance x between the observer and the wall.

An observer X is on an island 5500 m from a vertical cliff on the shore. A ship Y is anchored between the island and the Cliff. A blast on the ship’s siren is heard twice by X, the interval being 5s. [Velocity of sound = 330 ms⁻¹]

(i) Find the distance of the ship from the island.
(i) Find the distance of the cliff from the ship.

Name the particles that constitute the cathode rays. State some properties of cathode rays.

A nucleus \[\ce{^194_82X}\] emits an alpha particle

1. What will be the atomic number of the daughter nucleus Y?
2. What will be the number of neutrons in the daughter nucleus Y?
3. Write a nuclear reaction showing the emission of this particle.

Name the waves used for sound ranging. State one reason for their use.

Work done by this force at any instant is ______.