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

Draw the diagram given below and clearly show the path taken by the emergent ray.

A ray of light passes from water to air. How does the speed of light change?

Which colour of light travels fastest in any medium except air?

Name a prism required for obtaining a spectrum of Ultraviolet light.

Light passes through a rectangular glass slab and through a triangular glass prism. In what way does the direction of the two emergent beams differ and why?

A nucleus `""_11^24Na`  emits a beta particle to change into Magnesium (Mg)

(i) Write the symbolic equation for the process.
(ii) What are numbers 24 and 11 called?
(iii) What is the general name of `""_12^24Mg `with respect to `""_11^24Na` ?

In a cathode ray tube state:
(i) the purpose of covering cathode by thorium and carbon.
(ii) the purpose of the fluorescent screen.
(iii) how is it possible to increase the rate of emission of electrons.

Why is the ratio of the velocities of light of wavelengths 4000Å and 8000Å in vacuum 1: 1?

Which of the above wavelengths has a higher frequency?

The following diagram shows a 60°, 30°, 90° glass prism of critical angle 42°, Copy the diagram and complete the path of incident ray AB emerging out of the prism marking the angle of incidence on each surface.

What do you understand by free vibrations of a body?

State any two advantages of electromagnets over permanent magnets.

The pulley system has drawn lifts a load of 150 N when an effort of 60 N is applied. Find its mechanical advantage.

Is the above pulley system an ideal machine or not?

State two differences between "Heat Capacity" and "Specific Heat Capacity".

What are isobars?

Give one example of isobars.

Radiations given out from a source when subjected to an electric field in a direction perpendicular to their path are shown below in the diagram. The arrows show the path of the radiation A, B and C. Answer the following questions in terms of A, B and C.

1) Name the radiation B which is unaffected by the electrostatic field.

2) Why does the radiation C deflect more than A?

3) Which among the three causes the least biological damage externally.

4) Name the radiation which is used in carbon dating.

Differentiate between a single fixed pulley and a single movable pulley.

Draw diagrams to show the refraction of light from 

1. air to glass, and
2. glass to air. In each diagram, label the incident ray, refracted ray, the angle of incidence
3. and the angle of refraction (r).