MCQ Questions for Class 9 Science Chapter 11 Work and Energy

Do you need some help in preparing for your upcoming Class 9 Science exam? We’ve compiled a list of MCQ questions on CBSE Class 9 Science Chapter 11 Questions with Answers to get you started with the subject. Practice NCERT MCQ Questions for Class 9 Science Chapter 11 Work and Energy with Answers Pdf free download, and learn how smart students prepare well ahead MCQ Questions for Class 9 Science with Answers

Work and Energy Class 9 MCQs Questions with Answers

Solving Work and Energy Multiple Choice Questions of Class 9 Science Chapter 11 MCQ can be really beneficial because you will be familiar with all of the topics. These MCQ Questions for Class 9 Science Chapter 11 Work and Energy with answers provide for a quick review of the Chapter, allowing you to have a better understanding of the subject.

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

Answer

Answer: (c) remains constant


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

Answer

Answer: (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

Answer

Answer: (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

Answer

Answer: (c) Kilowatt


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

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

Answer

Answer: (a) Energy


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

Answer

Answer: (b) Power


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

Answer

Answer: (b) Energy


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

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

Answer

Answer: (b) mgh


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

Answer

Answer: (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

Answer

Answer: (c) Kinetic energy


Fill in the Blanks.

Question 13.
1 kJ equals ______

Answer

Answer: 1000 J


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

Answer

Answer: James Prescott Joule


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

Answer

Answer: increases


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

Answer

Answer: kinetic energy


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

Answer

Answer: Watt


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

Answer

Answer: constant


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

Answer

Answer: potential energy


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

Answer

Answer: Joule


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

Answer

Answer: Joule


Question 22.
The rate of work done is called _______

Answer

Answer: power


True/False.

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

Answer

Answer: True


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

Answer

Answer: True


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

Answer

Answer: False


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

Answer

Answer: True


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

Answer

Answer: True


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

Answer

Answer: False


Question 29.
Work is a vector quantity.

Answer

Answer: False


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

Answer

Answer: True


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

Answer

Answer: True


Question 32.
Work has only magnitude and no direction.

Answer

Answer: True


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
Answer

Answer:

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

Answer in one Word/Sentence.

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

Answer

Answer: Scalar


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

Answer

Answer: Scalar


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

Answer

Answer: James Prescott Joule


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

Answer

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


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

Answer

Answer: Mechanical energy


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

Answer

Answer: Watt


Question 40.
What is defined as the capacity of doing work?

Answer

Answer: Energy


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