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

A single fixed pulley is used because it ______.

Make the correct choice for each of the following :

Which one of the five diagrams represents the path of a ray of light through a periscope?

A uniform metre rule balances horizontally on a knife edge placed at the 58 cm mark when a weight of 20 gf is suspended from one end.

1. Draw a diagram of the arrangement.
2. What is the weight of the rule?

The diagram in Fig. shows a uniform metre rule weighing 100 gf, pivoted at its centre O. Two weights 150 gf and 250 gf hang from the point A and B respectively of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate :

1. the total anticlockwise moment about O,
2. the total clockwise moment about O,
3. the difference of anticlockwise and clockwise moments, and
4. the distance from O where a 100 gf weight should be placed to balance the metre rule.

A uniform metre rule of weight 10 gf is pivoted at its 0 mark. 

1. What moment of force depresses the rule?
2. How can it be made horizontal by applying a least force?

A uniform half-metre rule can be balanced at the 29.0 cm mark when a mass of 20 g is hung from its one end.

1. Draw a diagram of the arrangement.
2. Find the mass of the half-metre rule.
3. In which direction would the balancing point shift if 20 g mass is shifted inside from its one end?

A uniform metre rule of mass 100g is balanced on a fulcrum at mark 40cm by suspending an unknown mass m at the mark 20cm. What is the resultant moment now?

A uniform metre rule of mass 100g is balanced on a fulcrum at mark 40cm by suspending an unknown mass m at the mark 20cm.

How can it be balanced by another mass 50 g ?

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?