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Science
9th
grade
Law of Conservation of Energy | Work and Energy | Assessment | English | Grade 9
8 questions
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- 1. Multiple Choice
When a object is made to fall freely, why is the kinetic energy zero?
Because the object is at rest
Because the object does not have the energy required
Because the velocity is zero
None of these
- 2. Multiple Choice
Which of the following best describes the law of conservation of energy?
Energy can neither be created, nor be destroyed.
Energy can neither be created, nor be destroyed. It can only be converted from one form to another.
Energy can neither be created, nor be destroyed. Also it cannot be converted from one form to another.
Energy can be created and can be destroyed.
- 3. Multiple Choice
A ball of mass 50 g was dropped from 2 m. what is the velocity of the ball when the ball reaches the ground?
9.8 m/s
6.26 m/s
50 m/s
39.2 m/s
- 4. Multiple Choice
Mechanical energy of an object of mass 2 kg is 200 J. What will be its potential energy and kinetic energy of the object at 5 m? (Take g=10 m/s² )
100 Joule and 200 Joule
0 Joule and 100 Joule
100 Joule and 100 Joule
200 Joule and 0 Joule
- 5. Multiple Choice
Suppose Tara kicked a football. How can you sum up the energy of the ball at every point till it touches the ground?
1/2 mv² + mgh = constant
1/2 mv² = mgh
1/2 mv² + mgh = 0
1/2 mv² = -mgh
- 6. Multiple Choice
What happens to the mechanical energy of a body when the momentum of the body is zero?
M.E = 0
M.E = Potential energy - kinetic energy
M.E = Gravitational potential energy
M.E = Kinetic energy
- 7. Multiple Choice
Which of the following graphs shows the appropriate relationship between potential energy, kinetic energy in the energy height graph for a ball thrown vertically upward?
- 8. Multiple Choice
An object of mass 4 kg has a kinetic energy of 200 Joule. If the object is at a height of 5 m, what is the total mechanical energy of the object?
200 Joule
196 Joule
0 Joule
396 Joule
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