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

An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.

The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?

A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s², find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.

A water pump raises 50 kg of water through a height of 25 m in 5s. Calculate the power supplied by the pump (Take: g = 10 N kg⁻¹).

An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).

What is a machine?

Name a machine which can be used to multiply force and change the direction of force applied.

Light of different colours is deviated through different angles by a prism. Explain the reason.

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.