Case study Questions in Class 9 Science Chapter 11 are very important to solve for your exam. Class 9 Science Chapter 11 Class 9 Science 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
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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
Case Study 1: The figure shows a watch glass embedded in clay. A tiny spherical ball is placed at edge B at a height h above the center A
The kinetic energy of the ball, when it reaches point A is
(a) zero
(b) maximum
(c) minimum
(d) can’t say
Answer: (b) maximum
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 the 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
Case Study 2: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 the 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) A microphone
(b) Bicycle
(c) Electric torch
(d) An electric bell
Answer: (b) Bicycle
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
Case Study 3: 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 with the required horsepower is used
The power of the 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
Answer: (d) 2.63
Case Study 4: Work and energy are fundamental concepts in physics that help us understand the physical world and the processes happening around us. Work is done when a force is applied to an object, and the object moves in the direction of the applied force. It is calculated as the product of force and displacement. The unit of work is joule (J). Energy, on the other hand, is the ability to do work. It exists in different forms, such as kinetic energy, potential energy, and various other forms like thermal energy, electrical energy, and chemical energy. The law of conservation of energy states that energy cannot be created or destroyed, but it can be transformed from one form to another. Understanding the concepts of work and energy helps us analyze the efficiency of machines, calculate the amount of work done, and comprehend various physical phenomena.
When is work considered to be done on an object?
a) When a force is applied to the object
b) When the object moves in the direction of the applied force
c) When the object remains stationary
d) When the object changes its shape
Answer: b) When the object moves in the direction of the applied force
How is work calculated?
a) Force multiplied by velocity
b) Force multiplied by acceleration
c) Force multiplied by displacement
d) Force divided by time
Answer: c) Force multiplied by displacement
What is the unit of work?
a) Newton (N)
b) Meter (m)
c) Joule (J)
d) Watt (W)
Answer: c) Joule (J)
What is energy?
a) The ability to do work
b) The force applied to an object
c) The distance traveled by an object
d) The mass of an object
Answer: a) The ability to do work
According to the law of conservation of energy, what happens to energy?
a) It can be created
b) It can be destroyed
c) It can be transformed from one form to another
d) It remains constant
Answer: c) It can be transformed from one form to another
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