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Class 9 Exam  >  Class 9 Tests  >  Science Olympiad Class 9  >  Olympiad Test: Work and Energy- 2 - Class 9 MCQ

Olympiad Test: Work and Energy- 2 - Class 9 MCQ


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10 Questions MCQ Test Science Olympiad Class 9 - Olympiad Test: Work and Energy- 2

Olympiad Test: Work and Energy- 2 for Class 9 2024 is part of Science Olympiad Class 9 preparation. The Olympiad Test: Work and Energy- 2 questions and answers have been prepared according to the Class 9 exam syllabus.The Olympiad Test: 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 Olympiad Test: Work and Energy- 2 below.
Solutions of Olympiad Test: Work and Energy- 2 questions in English are available as part of our Science Olympiad Class 9 for Class 9 & Olympiad Test: Work and Energy- 2 solutions in Hindi for Science Olympiad Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt Olympiad Test: Work and Energy- 2 | 10 questions in 20 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study Science Olympiad Class 9 for Class 9 Exam | Download free PDF with solutions
Olympiad Test: Work and Energy- 2 - Question 1
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A batsman hits the ball of mass 250 g with his bat and the ball leaves the bat with a speed of 10 m/s Find the work done by the bat on the ball

Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 1
K.E. = ½ mv2 = ½ × (250/1000) × (10)2 = 12.5 J
Olympiad Test: Work and Energy- 2 - Question 2
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A 1 kg mass has a kinetic energy of 1 joule when its speed is

Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 2

K.E. = 1/2 mv2

V = √2K.E/m = √2×12/1 = √2 = 1.4 m/s

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Olympiad Test: Work and Energy- 2 - Question 3
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Work done by a string when a stone is tied to it and whirled in a circle is

Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 3
When a stone is tied to a string and whirled in circle no work is said to be done.

The string and tangent of the circle will be perpendicular. Hence, work done is zero.

Olympiad Test: Work and Energy- 2 - Question 4
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A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the K.E. of the car
Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 4
K.E. = 1/2mv2

so K.E. is proportional to v2 i.e., the kinetic energy of the car becomes 16 times that of initial kinetic energy

Olympiad Test: Work and Energy- 2 - Question 5
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Two unequal masses posses the same momentum, then the Kinetic energy of the heavier mass is ________ than the Kinetic energy of the lighter mass
Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 5

K.E. = ½ mv2 = ½ (mv)2/m = p2/2m (p = 2m = momentum)

Here pH=Pl of the two unequal masses me and mh

K.Eh/K.EL = ml/mh => K.Eh = me/wh (K.El)

∴ K.Eh < K.El

Olympiad Test: Work and Energy- 2 - Question 6
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Find the energy possessed by a ball of mass 550g rolling on the surface with a speed of 25 m/sec.
Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 6

Energy due to motion = K.E. = ½ mv2

= ½ × 550/1000 kg × (25m / sec)2

= 171.875 J

Olympiad Test: Work and Energy- 2 - Question 7
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An iron sphere of mass 30 kg has the same diameter as an aluminium sphere whose mass is 10.5

kg. The spheres are dropped simultaneously from a cliff. When they are 10 m from the ground, they

have the same _______.
Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 7
Both the spheres are under the force of gravity (g = a)
Olympiad Test: Work and Energy- 2 - Question 8
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If air resistance is negligible, the sum total of potential and Kinetic energies of a freely falling body
Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 8
Under zero air resistance condition, the sum of potential and kinetic energy of a freely falling body will remain constant.
Olympiad Test: Work and Energy- 2 - Question 9
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A car is accelerated on a travelled road and acquires a velocity 4 times of its initial velocity. During

this process, the potential energy of the car
Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 9
Potential energy is due to its position and not motion.
Olympiad Test: Work and Energy- 2 - Question 10
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In case of negative work, the angle between the force and displacement is
Detailed Solution for Olympiad Test: Work and Energy- 2 - Question 10

W = F cosθ × s

For, θ = 180°, cosθ = –1

Force acts in opposite direction of the motion

of the body

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