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Science Work, Energy, and Simple Machines - Chapter 7 Class 9 Exploration MCQ and Assertion Questions

Short Quiz · Class 9 · Science · CBSE

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Chapter 7 - Work, Energy, and Simple Machines (Exploration) | 5 questions | about 4 minutes

Practise Work, Energy, and Simple Machines - Chapter 7 Class 9 Exploration with Teachoo's Short Quiz (Class 9 · Science · CBSE). Practise these questions in a free interactive quiz with answer feedback.

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Question 1 of 5
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Question 1 of 5
Two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer from the codes given above.
Assertion (A) : A girl walking on a level road with a box on her head does positive work on the box with the upward force she applies.
Reason (R) : If a force acts in a direction perpendicular to the displacement of an object, the work done by that force is zero.
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Question 2 of 5
Consider the following statements about the work done by a force on an object :
(i) The work done is zero when the force acting on the object is zero.
(ii) The work done is zero when the displacement of the object is zero.
(iii) The work done is zero when the force is perpendicular to the displacement.
(iv) The work done is zero when the displacement is opposite to the direction of the force.
Which of these statements are correct ?
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Question 3 of 5
Identify the statement being described : it says that the work done on an object is equal to the change in its energy, and it holds for a system of objects and even when the forces applied on an object are not constant.
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Question 4 of 5
Photosynthesis in green leaves is an energy transformation of the type
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Question 5 of 5
Identify the quantity whose value is zero in this situation : a girl walks on a level road carrying a box on her head. She applies an upward force to balance the weight of the box, but the box moves horizontally.
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