(English Medium) ICSE Class 10 - CISCE Important Questions for Physics

Define the power of a lens.

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

What do you understand by the term Scattering of light?

State Fleming’s left-hand rule.

A moment of couple has a tendency to rotate the body in an anticlockwise direction. Then the moment of the couple is taken as ______.

A metal rod AB of length 80 cm is balanced at 45 cm from the end A with 100 gf weights suspended from the two ends.

1. If this rod is cut at the center, C, then compare the weight of AC to the weight of BC. (Use >, < or =)
2. Give a reason for your answer in (a).

A person standing in front of a cliff fires a gun and hears its echo after 3 s. If the speed of sound in air is 336 ms⁻¹.

1. Calculate the distance of the person from the cliff.
2. After moving a certain distance from the cliff, he fires the gun again, and this time the echo is heard 1.5 s later than the first. Calculate the distance that the person moved.

The kinetic energy of a given body depends on the ______.

For the following scenario, state whether the work done by gravity is positive, negative, or zero.

A person walks on a levelled road.

For the following scenario, state whether the work done by gravity is positive, negative, or zero.

A person climbs a ladder.

For the following scenario, state whether the work done by gravity is positive, negative, or zero.

A car in neutral gear is coming down the slope.

A block and tackle system of pulleys has a velocity ratio of 4.

1. Draw a labelled diagram of the system indicating clearly the direction of the load and effort.
2.  Calculate the potential energy of the load 100 kgf lifted by this pulley to a height 5 m. (g = 10 ms⁻²)

Name the principle on the basis of which optical fibres work.

The diagram below shows a fish in the tank and its image seen on the surface of the water.

Name the phenomenon responsible for the formation of this image.

Why does sun appear red at sunrise and sunset?

Name the waves used for echo depth sounding.

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 ______.

The above picture shows a mother pushing her daughter sitting on a swing. The swing is going through the positions A, B, C where A and C are extreme positions and B is the mean position.

1. Which is the right position i.e. at A, B or C, for the mother to give a constant periodic push to the swing every time in the forward direction to increase the amplitude of the swing?  (1)
2. Name the phenomenon involved in this.  (1)
3. Explain with this example how this phenomenon helps to increase the amplitude of the swing.  (2)

Which particles are responsible for current in conductors?