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

Name a machine which is used to:

change the direction of force applied.

Write two uses of pulleys. Is pulley a force multiplier?

Fig shown a block and tackles system of pulleys used to lift a load.

(i) How many strands of tackle are supporting the load?

(ii) Draw arrows to represent tension in each stand.

(iii) What is the mechanical advantage of the system?

(iv) When load is pulled up by a distance 1 m how far does the effort end move?

What is a block and tackle system of pulleys?

(a)  Fig represents an incomplete diagram of a simple string pulley      system. Copy this diagram on a new page and complete it and mark where the effort must be applied to lift the load.
(b) What is the velocity ratio of this system?
(c) If the pulley system is 80% efficient and the load is 720 N, then
    (i) What effort must be applied to lift the load?
    (ii) What work must be done must be done in lifting the load through   a distance of 2 m using this machine?

1. 1. the angle of refraction and
   2. the angle of deviation for the ray?

Define the term refractive index of a medium. What do you understand by the statement 'the refractive index of glass is 1.5 for white light'?

A ray of light passes from air to water. In fig. 39, which of the ray A, B, C and D is the correct refracted ray?

In the fig. name the ray which represents the correct path of light while passing through a glass block.

Which of the following has the highest refractive index: