CBSE - Class 9th - Science - Ch 11 - Work and Energy - Question Bank

Hello Students,

As a continuation to my previous post on Question bank for Chapter 10th, In this post, I would like to share question bank for Chapter 11th which is Work and Energy. These questions shall help you revise all your fundamental concepts related to Work and Energy Module and will help you stay better prepared for exams.

CBSE - NCERT - Class 9th - Science

Chapter 11th - Work and Energy

• What is Work?

• What are the 2 conditions which needs to be satisfied for work to be done?

• How is Work defined in Science? Give its mathematical expression.

• A constant force is applied to push a box and throughout the duration of applied force, the box moves through a distance of 4 m. If the force applied was 10 N. Calculate the work done.

• A force of 5 N is applied to a box. Force is applied for 2 seconds and at the end the box stays at the same place. Calculate the work done.

• A drinking water-can weighing 20 kg is lifted from the kitchen floor and kept at the platform at a height of 1.5 m from the floor. Calculate the work done by the person on the water can.

• Can work done be negative? How?

• How is Energy defined in Science?

• What are the various forms of Energy?

• What is Kinetic Energy? Derive a mathematical expression of Kinetic Energy.

• A car having a mass of 200 kg is moving at a uniform velocity of 10 m/s. Calculate the Kinetic energy possessed by the car.

• A bike is moving a velocity of 5 m/s. A force is applied via engine and it reaches a velocity of 15 m/s.  Calculate the work done on the bike by its engine if its mass is 100 kg.

• What will happen to the kinetic energy of a moving object if its velocity is tripled?

• What is Potential Energy? Give its mathematical expression.

• What is Gravitational Potential Energy?

• An object of mass 10 kg is tied at certain height from the ground. The potential energy possessed by the object is 49 J. Find the height at which the object is tied from the ground. Assuming g=9.8m/s²

• State the Law of Conservation of Energy. How does it applies to an object falling from a certain height?

• Define Power. 

• Define 1 Watt.

• Alen and Matt did work of 1000 J each while doing a task. Alen took 10 seconds while Matt took 20 seconds to complete the task. Who spent more power?

• Lisa climbs up a 10 m high hill in 50 seconds. Assuming the mass of Lisa to be 50 kg and g=10 m/s², Calculate her Power.

• Convert 1 KW h to Joules.

• A Laptop of 45 W runs for 15 hrs a day. Calculate the energy usage in the month of April. Calculate the energy bill if the fixed charge is Rs. 50 and consumption charge is Rs. 4 per unit. Assume no other charges or usage of any other equipment over the month. 

Hope you would find the question bank useful for preparation. Do let me know your thoughts by commenting below.