# Case Study Questions of Chapter 11 Work and Energy PDF Download

Case study Questions on Class 9 Science Chapter 11 are very important to solve for your exam. Class 9 Science Chapter 11 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 9 Science Chapter 11 Work and Energy

In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

# Work and Energy Case Study Questions With answers

Here, we have provided case-based/passage-based questions for Class 9 Science Chapter 11 Work and Energy

Case Study/Passage Based Questions

Figure shows a watch glass embedded in clay. A tiny spherical ball is placed at the edge B at a height h above the centre A

The kinetic energy of the ball, when it reaches at point A is
(a) zero
(b) maximum
(c) minimum
(d) can’t say

The ball comes to rest because of
(a) frictional force
(b) gravitational force
(c) both (a) and (b)
(d) none of these

Answer: (c) both (a) and (b)

The energy possessed by ball at point C is
(a) potential energy
(b) kinetic energy
(c) both potential and kinetic energy
(d) heat energy.

Answer: (a) potential energy

Case Study/Passage Based Questions

The principle of conservation of energy states that the energy in a system can neither be created nor be destroyed. It can only be transformed from one form to another, but total energy of the system remains constant. Conservation of electrical energy to various forms or vice versa along with devices is illustrated in the figure given below.

Water stored in a dam possesses
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy.

Answer: (d) potential energy.

A battery lights a bulb. Describe the energy changes involved in the process.
(a) Chemical energy →Light energy → Electrical energy
(b) Electrical energy → Chemical energy → Electrical energy
(c) Chemical energy → Electrical energy → Light energy
(d) None of these.

Answer: (c) Chemical energy → Electrical energy → Light energy

Name a machine that transforms muscular energy into useful mechanical work.
(a) Amicrophone
(b) Bicycle
(c) Electric torch
(d) An electric bell

A body is falling from a height of h. After it has fallen a height h/2 , it will possess
(a) only potential energy
(b) only kinetic energy
(c) half potential and half kinetic energy
(d) more kinetic and less potential energy.

Answer: (c) half potential and half kinetic energy

Case Study/Passage Based Questions

An elevator weighing 500 kg is to be lifted up at a constant velocity of 0.4 m s–1. For this purpose a motor of required horse power is used

The power of motor is
(a) 1940 W (b) 1950 W
(c) 1960 W (d) 1970 W

Answer: (c) 1960 W

The power of motor in hp is
(a) 2.33 (b) 2.43
(c) 2.53 (d) 2.63