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

A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which does not change.

State two factors on which the speed of a wave travelling in a medium depends.

State two differences between the light and sound waves.

What is the condition necessary for an echo to be heard distinctly?

State the use of echo by a bat, dolphin and fisherman.

How do bats avoid obstacles in their way, when in flight?

Name the waves which are used in sonar to find the depth of a sea. Give one reason for their use.

State the S.I. unit of electric potential.

How is the electric potential difference between the two points defined? State its S.I. unit.

Explain the statement ‘the potential difference between two points is 1 volt’.

Explain the analogy between the flow of charge (or current) in a conductor under a potential difference with the free fall of a body under gravity. 

How does the resistance of a metallic wire depend on its temperature? Explain with reason.

What adjustments would you make for tuning a stringed instrument for it to emit a note of a desired frequency?

The following diagram shows three ways in which the string of an instrument can vibrate.

(a) which of the diagram shows the principal note?
(b) which has the frequency four times that of the first?
(c) what is the ratio of the frequency of the vibration in (i) and (ii)?

A pair of scissors is used to cut a piece of a cloth by keeping it at a distance 8.0 cm from its rivet and applying an effort of 10 kgf by fingers at a distance 2.0 cm from the rivet.

1. Find:
   1. the mechanical advantage of scissors and
   2. the load offered by the cloth.
2. How does the pair of scissors act: as a force multiplier or as speed multiplier?

The figure below shows the use of a lever.

1. State the principle of moments as applied to the above lever.
2. To which class of lever does it belong ? Give an example of this class of lever.
3. If FA = 10 cm, AB = 490 cm calculate:
   1. the mechanical advantage and
   2. the minimum effort required to lift the load (= 50 N).

Draw a circuit diagram to expain the ring system of house wiring. State two advantage of it.

Draw a labelled diagram with necessary switch, regulator, etc. to connect a bulb and a fan with the mains. In what arrangement are they connected to the mains : series or parallel?

Fig 9.15 shows two ways (a) and (b) of connecting the three lamps A, B and C to a.c. supply of 220 V. Name the two arrangements. Which of them would you prefer in a household circuit? Give reason for your answer.

State a law, which determines the direction of magnetic field around a current carrying wire.