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

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 ______.

Two sound waves X and Y have the same amplitude and the same wave pattern but their frequencies are 60 Hz and 120 Hz respectively, then ______.

State whether work is done or not, by writing yes or no, in the following case:

A man pushes a wall.

State whether work is done or not, by writing yes or no, in the following case:

A boy climbs up 20 stairs.

Which colour of white light travels slowest, in glass?

Write the approximate wavelength for red light.

The wavelengths for the light of red and blue colours are nearly 7·8 × 10^-7 m and 4·8 × 10^-7 m respectively.

Which colour has greater speed in glass?

In the transmission of power the voltage of power generated at the generating stations is stepped up from 11kV to 132 kV before it is transmitted. Why?

Name the subjective property of light related to its wavelength.

Name the device used to increase the voltage at a generating station.

The smoke from a fire looks white. Which of the following statements is true?

1) Molecules of the smoke are bigger than the wavelength of light

2) Molecules of the smoke are smaller than the wavelength of light.

State the condition when a force produces translational motion.

State the condition when a force produces rotational motion in a body.