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Class 9 Exam  >  Class 9 Tests  >  Science Class 9  >  MCQ : Work And Energy - 2 - Class 9 MCQ

MCQ : Work And Energy - 2 - Class 9 MCQ


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15 Questions MCQ Test Science Class 9 - MCQ : Work And Energy - 2

MCQ : Work And Energy - 2 for Class 9 2024 is part of Science Class 9 preparation. The MCQ : Work And Energy - 2 questions and answers have been prepared according to the Class 9 exam syllabus.The MCQ : Work And Energy - 2 MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for MCQ : Work And Energy - 2 below.
Solutions of MCQ : Work And Energy - 2 questions in English are available as part of our Science Class 9 for Class 9 & MCQ : Work And Energy - 2 solutions in Hindi for Science Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt MCQ : Work And Energy - 2 | 15 questions in 20 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study Science Class 9 for Class 9 Exam | Download free PDF with solutions
MCQ : Work And Energy - 2 - Question 1
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A body is moved through a distance of 3 m in the following different ways. In which case is the maximum work done?

Detailed Solution for MCQ : Work And Energy - 2 - Question 1

Work done = Mgh
Work will be maximum when the change in height is maximum, thus when it is lifted vertically upward.

MCQ : Work And Energy - 2 - Question 2
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Two bodies of equal weight are kept at heights of h and 1.5 h, respectively. The ratio of their potential energies is:

Detailed Solution for MCQ : Work And Energy - 2 - Question 2

Potential energy is mathematically defined as, P.E = mgh
Potential energy of body 1 = P.E1 = mgh1 
Potential energy of body 2 = P.E2 = mgh2 
Since weight of two bodies are equal, therefore, P.E1 / P. E2 =  h / 1.5 h = 2:3 

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MCQ : Work And Energy - 2 - Question 3
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In the SI system, the unit of potential energy is:

Detailed Solution for MCQ : Work And Energy - 2 - Question 3

Potential energy is energy stored in matter. Joule is the SI unit of energy.

MCQ : Work And Energy - 2 - Question 4
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A mass ‘m’ falls from a height ‘h’ any point on its path the total energy is:
Detailed Solution for MCQ : Work And Energy - 2 - Question 4
  • Energy at start will be = Potential Energy = mgh
  • According to the law of conservation of energy, it's total energy will be the same at all points i.e. = mgh.
MCQ : Work And Energy - 2 - Question 5
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The formula to find the work done is
Detailed Solution for MCQ : Work And Energy - 2 - Question 5

Answer: (b) W = F.s

Work Done: The work done by a force is calculated as the product of the force and the displacement in the direction of the force.

MCQ : Work And Energy - 2 - Question 6
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Newton-metre is the unit of:
Detailed Solution for MCQ : Work And Energy - 2 - Question 6

Work = Force * Displacement (N-m)

MCQ : Work And Energy - 2 - Question 7
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If a force acting on a body causes no displacement, the work done is_________
Detailed Solution for MCQ : Work And Energy - 2 - Question 7

Answer:  0

The work done is zero when the force acting on a body causes no displacement.

MCQ : Work And Energy - 2 - Question 8
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 Objects in motion possess energy and can do work; this energy is called_______________. 
Detailed Solution for MCQ : Work And Energy - 2 - Question 8

Answer: (d) Kinetic Energy

Explanation: Kinetic energy is defined as the work needed to accelerate a body of a given mass from rest.

MCQ : Work And Energy - 2 - Question 9
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The sum of kinetic energy and potential energy is __________. 
Detailed Solution for MCQ : Work And Energy - 2 - Question 9

Answer: (a) Mechanical energy

Explanation: Mechanical energy = kinetic energy + potential energy

MCQ : Work And Energy - 2 - Question 10
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What are the various factors affecting kinetic energy?
Detailed Solution for MCQ : Work And Energy - 2 - Question 10

Answer: (d) All the above options

Explanation: Factors affecting kinetic energy are mass, momentum, and velocity.


     
MCQ : Work And Energy - 2 - Question 11
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Two bodies of unequal masses are dropped from a cliff. At any instant, they have equal:
Detailed Solution for MCQ : Work And Energy - 2 - Question 11

They will have the same acceleration due to gravity because it is independent of mass. 

MCQ : Work And Energy - 2 - Question 12
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When two identical bodies are in motion, the body with a higher velocity has __________.
Detailed Solution for MCQ : Work And Energy - 2 - Question 12

- Kinetic energy is given by the formula  KE = 1/2 mv2
- When two bodies are identical, they have the same mass.
- The kinetic energy depends on the square of the velocity.
- A higher velocity results in a higher K.E. 
- Therefore, the body with a higher velocity has higher kinetic energy.
- Correct answer: B: Higher Kinetic Energy.

MCQ : Work And Energy - 2 - Question 13
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Two masses m and 2m are dropped from a certain height ‘h’. Then on reaching the ground:
Detailed Solution for MCQ : Work And Energy - 2 - Question 13
  • Since the free-falling acceleration is not dependent on mass, the final velocities of both masses are the same.
    The kinetic energy = KE = mv2/2
  • Hence, the kinetic energy of the heavier mass will be more.
MCQ : Work And Energy - 2 - Question 14
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 If the displacement is perpendicular to the force, then the work done is said to be—————.
Detailed Solution for MCQ : Work And Energy - 2 - Question 14

Answer: (c) 0

Explanation: If the displacement is perpendicular to the force, then the work done is zero.

MCQ : Work And Energy - 2 - Question 15
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In the case of negative work, the angle between the force and displacement is:
Detailed Solution for MCQ : Work And Energy - 2 - Question 15
  • Work done by any force is the product of the component of the force in the direction of displacement and the magnitude of displacement.
    W = F.d = Fd cosθ
  • When  W =−ve, it means cosθ = −ve
    Therefore, θ = 180º
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