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

On what factors does the resistance of a conductor depend?

Define the power of a lens.

What do you understand by the term Scattering of light?

An object is placed at a distance 24 cm in front of a convex lens of focal length 8 cm.

(i) What is the nature of the image so formed?
(ii) Calculate the distance of the image from the lens.
(iii) Calculate the magnification of the image.

Why does sun appear red at sunrise and sunset?

Name the waves used for echo depth sounding.

Define specific resistance.

Which particles are responsible for current in conductors?

The diagram below shows a cardboard on which iron filings are kept. A wire bent in the form of a loop is seen passing through the cardboard. When current flows through it, the iron filings arrange themselves as shown below.

1. State the polarities of the battery at A and B.
2. State the effect on the magnetic field if an iron rod is held along the axis of the coil.
3. State one way to:
   1. Change the polarity of the coil.
   2. Decrease the strength of the magnetic field around the coil.

To which wire of a cable in a power circuit should the metal case of geyser be connected.

To which wire should the fuse be connected?

State two characteristics of a good thermion emitter.

State two characteristics of a good thermion emitter.

What is the principle of Calorimetry?

Name the material used for making a Calorimeter.

When does the nucleus of an atom tend to become radioactive?

A brass ball is hanging from a stiff cotton thread. Draw a neat labeled diagram showing the forces acting on the brass ball and cotton thread

The distance between two bodies is doubled. How is the magnitude of the gravitational force between them affected?