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

In figure, a uniform bar of length l m is supported at its ends and loaded by a weight W kgf at its middle. In equilibrium, find the reactions R₁ and R₂ at the ends. 

`["Hint:"  "In equilibrium"  "R"_1 + "R"_2 = "W"   "and"   "R"_1 xx l/2 = "R"_2 xx l/2]`

When an illuminated object is held in front of a thick plane glass mirror, several images are seen, out of which the second image is the brightest. Give reason.

A beam of blue, green, and yellow light passes through the earth's atmosphere. Name the colour which is scattered the least.

A beam of blue, green and yellow light passes through the earth's atmosphere. Name the colour which is scattered the most.

Which colour of white light is scattered the least? Give reason.

To an astronaut in a space-ship, the earth appears ______.

A substance changes from its solid state to the liquid state when heat is supplied to it. How does the average kinetic energy of the molecules of the substance change?

A radioactive source emits three types of radiations.

Name the three radiations.

A radioactive source emits three types of radiations.

Name the radiations which are deflected by the electric field.

The diagram in figure shows a radioactive source S placed in a thick lead walled container. The radiations given out are allowed to pass through a magnetic field. The magnetic field (shown as ×) acts perpendicular to the plane of paper inwards. Arrows shows the paths of the radiation A, B and C.

1. Name the radiations labelled A, B and C.
2. Explain clearly how you used the diagram to arrive at the answer in part (a).

In following Figure shows a mixed source R of alpha and beta particles in a thick lead walled container. The particles pass through a magnetic field in a direction perpendicular to the plane of paper inwards as shown by ×.

1. Show in the diagram how the particles get affected.
2. Name the law used in part (a).

[Hint: Alpha particles will deflect to the left while beta particles to the right]

In following Figure shows a radioactive source S in a thick lead walled container having a narrow opening. The radiations pass through an electric field between the plates A and B.

1. Complete the diagram to show the paths of α, β and γ radiations.
2. Why is the source S kept in a thick lead walled container with a narrow opening?
3. Name the radiation which is unaffected by the electrostatic field.
4. Which radiation is defleced the most. Given reason.
5. Which among the three radiations causes the least biological damage?

Explain why alpha and beta particles are deflected in an electric or a magnetic field, but gamma rays are not deflected in such a field.

Is it possible to deflect  γ - radiations in a way similar to α and β -particles, using the electric or magnetic field? Give reasons.

State following four properties each of α, β and γ radiations:

1. Nature,
2. Charge,
3. Mass and
4. Effect of electric field.

Arrange the α, β, and γ raditions in ascending order of their ionising powers.

State the speed of each of α, β and γ radiations.

What is the composition of α, β and γ radiations?

Arrange the α, β, and γ radiation in ascending order of their biological damage. Give reason.

A radioactive substance emits radiations ______.