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Science
9th
grade
Scientific Concept of Work | Work and Energy | Assessment | English | Grade 9
7 questions
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- 1. Multiple Choice
What is the SI unit of work?
Newton
Newton/m²
Joule
Both option 2 and 3
- 2. Multiple Choice
What is the angle between force and displacement in cases of negative work?
360°
180°
90°
45°
- 3. Multiple Choice
A trolley of mass 5 kg is moving with initial velocity of is 6 m/s in certain direction. The trolley comes to rest after a displacement of 20 m due to frictional force.What is the amount of work done needed on trolley if it is to move with constant velocity of 6m/s?
90 Joule
0 Joule
540 Joule
Given information is not complete
- 4. Multiple Choice
A force of 10 N is applied on an object which moves 10 m perpendicular to the direction of force. Calculate the work done?
100 Joule
98 Joule
0 Joule
- 100 Joule
- 5. Multiple Choice
A goalkeeper saved a goal. Which of the following statements correctly describes work done by the keeper?
Work done is negative as force acts opposite to the direction of displacement.
Work done is zero as force acts perpendicular to direction of displacement.
Work done is positive as force stops the displacement.
None of these
- 6. Multiple Choice
Which of the following statement is false?
Work done is affected by gravitational force.
Work has magnitude but no direction.
Work done depends on force and displacement.
Work done can either be positive or negative.
- 7. Multiple Choice
A body weighing 20 kg is lifted upwards through a displacement of 4 m. What is the work done?
100 Joule
784 Joule
0 Joule
None of these
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