# MCQ Questions for Class 9 Science Chapter 11 Work and Energy

Students are advised to practice the NCERT MCQ Questions for Class 9 Science Chapter 11 Work and Energy with Answers Pdf free download is available here. MCQ Questions for Class 9 Science with Answers are prepared as per the Latest Exam Pattern. Students can solve these Work and Energy Class 9 MCQs Questions with Answers and assess their preparation level.

## Work and Energy Class 9 MCQs Questions with Answers

Solving the Work and Energy Multiple Choice Questions of Class 9 Science Chapter 11 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Work and Energy Class 9 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 11 Science Class 9 and cross-check your answers during preparation.

Multiple Choice Questions

Question 1.
When a body falls freely towards the earth, then its total energy:
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases

Question 2.
In case of negative work, the angle between the force and displacement is:
(a) 0°
(b) 45°
(c) 90°
(d) 180°

Kinetic Energy Calculator calculates the kinetic energy as well as mass and velocity of an object.

Question 3.
Water stored in a dam possesses:
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy

Question 4.
Which one of the following is not the unit of energy?
(a) Joule
(b) Newton meter
(c) Kilowatt
(d) Kilowatt hour

Potential energy calculator will help you instantly determine the ultimate joule associated with a particular object.

Question 5.
A body is falling from a height h, After it has fallen a height $$\frac{h}{2}$$, 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

Question 6.

The capacity of a body to perform work is called:
(a) Energy
(b) Work
(c) Power
(d) Heat

Question 7.
The rate of work done is called:
(a) Energy
(b) Power
(c) Capacity
(d) All of these

Question 8.
The capacity to perform work is obtained from :
(a) Food
(b) Energy
(c) Power
(d) All of these

Question 9.
An object of mass, m moving with velocity v has a kinetic energy of:
(a) $$\frac{1}{2} m v^{2}$$
(b) mgh
(c) $$\frac{2 m}{v^{2}}$$
(d) 2mv2

Answer: (a) $$\frac{1}{2} m v^{2}$$

Question 10.
The gravitational potential energy of an object of mass, m raised through a height, h from the earth’s surface is given by:
(a) $$\frac{1}{2}$$ mv2
(b) mgh
(c) $$\frac{1}{2}$$ mgh
(d) 2mgh

Question 11.
If the displacement of the object is zero then the work done on an object by a force would be:
(a) 1 Joule
(b) 0.1 Joule
(c) 3.6 × 106 Joule
(d) zero

Question 12.
What is the energy possessed by an object due to its motion?
(a) Potential energy
(b) Electrical energy
(c) Kinetic energy
(d) None of them

Fill in the Blanks.

Question 13.
1 kJ equals ______

Question 14.
_______ formulated a law for the heating effect of electric current.

Question 15.
The kinetic energy of an object ______ with its speed.

Question 16.
An object in motion possesses what is known as the ________ of the object.

Question 17.
The S.I. unit of power is ________

Question 18.
The energy total of every system always remains _________

Question 19.
The energy stored in the water-filled in the dam is _________

Question 20.
The S.I. unit of kinetic energy is ________

Question 21.
The S.I. unit of work is ________

Question 22.
The rate of work done is called _______

True/False.

Question 23.
The energy used in one hour at the rate of 1 kW is called 1 kWh.

Question 24.
James Prescott Joule is best known for his research in electricity and thermodynamics.

Question 25.
Any object that does not possess energy can do work.

Question 26.
The unit of energy is, the same as that of work.

Question 27.
Work = Force × Displacement along the direction of the force.

Question 28.
The formula of kinetic energy is EK = mgh.

Question 29.
Work is a vector quantity.

Question 30.
The unit of energy in the C.G.S. system is erg.

Question 31.
The palm gets warmed while rubbing due to performing work.

Question 32.
Work has only magnitude and no direction.

Match the Column.

Question 33.

 A B 1. 1 Joule (i) Scalar quantity 2. Work (ii) 746 Watt 3. Power (iii) Force × Displacement 4. 1 horsepower (iv) 1 Newton × 1 meter 5. Energy (v) Work/Time

 A B 1. 1 Joule (iv) 1 Newton × 1 meter 2. Work (iii) Force × Displacement 3. Power (v) Work/Time 4. 1 horsepower (ii) 746 Watt 5. Energy (i) Scalar quantity

Question 34.
Is work done or energy a scalar or a vector quantity?

Question 35.
Is power is a scalar or a vector quantity?

Question 36.
Who verified experimentally the law of conservation of energy and discovered the value of the mechanical equivalent of heat?

Question 37.
Write an expression for the kinetic energy of an object.

Answer: Kinetic energy, EK = $$\frac{1}{2}$$ mv2

Question 38.
What is called the sum of the kinetic and potential energies of an object?

Question 39.
Write the S.I. unit of power.