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
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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