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

Give reason for the following:
 In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.

Give reason for the following:

In case of a block and tackle arrangement, the mechanical advantage increases with the increase in the number of pulleys.

What is the purpose of a switch in a circuit?

Give reason for the following:

The lower block of a block and tackle pulley system must be of negligible weight

A switch is not touched with wet hands while putting it on or off. Give a reason for your answer.

The mechanical advantage of an ideal single movable pulley is ______.

The following diagram shows three lamps and three switches 1, 2 and 3 connected with two cells.

1. Name the switch / switches to be closed so as to light all the three lamps.
2. How are the lamps connected: in series or in parallel?

A pulley system has a velocity ratio 3. Draw a diagram showing the point of application and direction of load (L), effort (E) and tension (T). It lifts a load of 150 N by an effort of 60 N. Calculate its mechanical advantage. Is the pulley system ideal? Give reason.

State two advantages of an electromagnet over a permanent magnet.

Write the expressions for the equivalent resistance R of three resistors R₁, R₂ and R₃ joined in

1. parallel
2. series 

A light ray in passing from water to a medium

(a) speeds up

(b) slows down. In each case, give one example of the medium. 

How does the speed of light change when it passes from glass to water? 

A ray of light is passing from a transparent medium 1 to another transparent medium 2 (i) Speed up (ii) slows down. In each case, state whether the refractive index of medium 2 is equal to, less than or greater than the refractive index of medium 1. 

What do you understand by the statement the refractive index of glass is 1.5 for white light? 

The diagram alongside shows the refraction of a ray of light from air to a liquid.

1. Write the values of (i) angle of incidence, (ii) angle of refraction.
2. Use Snell’s law to find the refractive index of liquid with respect to air.

In fig 4.18, name the ray which represents the correct path of light while emerging out through a glass block. 

Fill in the blanks to complete the following sentence 

When light travels from a denser to a rarer medium, its speed ………………. 

Fill in the blanks to complete the following sentence 

The refractive index of glass with respect to air is 3/2. The refractive index of air with respect to glass will be ………………. 

How is the angle of emergence related to the angle of incidence when prism is in the position of minimum deviation? Illustrate your answer with help of a labelled diagram using an equilateral prism? 

Name the colour of white light which is deviated the most on passing through a prism.