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

Copy and complete the labelled diagram connecting the two pulleys with a tackle to obtain Velocity Ratio= 2.

If Load = 48 kgf and efficiency is 80% then calculate:

1. Mechanical Advantage.
2. Effort needed to lift the load.
   

The adjacent diagram shows the movable block of a block and tackle system with effort in a convenient direction. From the diagram we can conclude that the number of pulleys used in the fixed block are ______.

A ______ lever will always have M.A. > 1.

In a block and tackle system, increase in the weight of the movable block ______ the efficiency of the pulley system.

How is the refractive index of a material related to real and apparent depth?

State the conditions required for total internal reflection of light to take place

Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation

A ray of light travels from water to air as shown in the diagram given below :

1) Copy the diagram and complete the path of the way. Given the critical angle for water is 48°.

2) State the condition so that internal reflection occurs in the above diagram.

The diagram below shows a point source P inside a water container. Four rays A, B, C, D starting from the source P are shown up to the water surface

1) Show in the diagram the path of these rays after striking the water surface.

The Critical Angle for the water-air surface is 48°.

2) Name the phenomenon which the rays B and D exhibit.

A boy uses the blue colour of light to find the refractive index of glass. He then repeats the experiment using the red colour of light. Will the refractive index be the same or different in the two cases? Give a reason to support your answer.

Copy the diagram given below and complete the path of the light ray till it emerges out of the prism. The critical angle of glass is 42°. In your diagram mark the angles wherever necessary.

State the dependence of angle of deviation On the refractive index of the material of the prism.

State the dependence of angle of deviation On the wavelength of light

Write a relationship between the angle of incidence and angle of refractions for a given pair of media

Name one factor that affects the lateral displacement of light as it passes through a rectangular glass slab.

The speed of light in glass is 2 × 10⁵ km/s. What is the refractive index of glass?

Jatin puts a pencil into a glass container having water and is surprised o see the pencil in a different state.

1) What change is observed in the appearance of the pencil?

2) Name the phenomenon responsible for the change.

3) Draw a ray diagram showing how the eye sees the pencil.

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?