Class 9 Exam > Class 9 Notes > MCQ with Solution : Work & Energy
MCQ with Solution : Work & Energy - Class 9 PDF Download
1. When a body falls freely towards the earth, then its total energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases
2. A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
(a) does not change
(b) becomes twice to that of initial
(c) becomes 4 times that of initial
(d) becomes 16 times that of initial
3. In case of negative work the angle between the force and displacement is
(a) 00
(b) 450
(c) 900
(d ) 1800
4. An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same
(a) acceleration
(b) momenta
(c) potential energy
(d) kinetic energy
5. A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g =10 m s–2)
(a) 6 ×103 J
(b) 6 J
(c) 0.6 J
(d) zero
6. Which one of the following is not the unit of energy?
(a) joule
(b) newton metre
(c) kilowatt
(d) kilowatt hour
7. The work done on an object does not depend upon the
(a) displacement
(b) force applied
(c) angle between force and displacement
(d) initial velocity of the object
8. Water stored in a dam possesses
(a) no energy
(b) electrical energy
(c) kinetic energy
(d) potential energy
9. A body is falling from a height h. After it has fallen a height h/2 , it will possess
(a) only potential energy
(b) only kinetic energy
(c) half potential and half kinetic energy
(d) more kinetic and less potential energy
10. How are Joule (J) and ergs (erg) related?
(a) 1J = 107 erg
(b) 1erg = 10 -7J
(c) 1J = 10-7 erg
(d) None
Solution
1. (c) 2. (a) 3. (d) 4. (a) 5. (d) 6. (c) 7. (d) 8. (d) 9. (c) 10.(b)
FAQs on MCQ with Solution : Work & Energy - Class 9
| 1. What is work in physics? |  |
Ans. In physics, work is defined as the transfer of energy that occurs when a force is applied to an object and the object moves in the direction of the force.
| 2. How is work calculated? | |
Ans. Work is calculated by multiplying the force applied to an object by the distance the object moves in the direction of the force. The formula for work is W = F x d, where W is work, F is force, and d is distance.
| 3. What is energy? | |
Ans. Energy is the ability to do work or cause change. It can take many forms, including kinetic energy (energy of motion), potential energy (energy stored in an object due to its position or state), and thermal energy (energy due to the temperature of an object).
| 4. What is the relationship between work and energy? | |
Ans. Work and energy are closely related. Work is the transfer of energy from one object to another, and energy is the ability to do work. When work is done on an object, its energy increases. Conversely, when work is done by an object, its energy decreases.
| 5. What is the law of conservation of energy? | |
Ans. The law of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed from one form to another. This means that the total amount of energy in a closed system remains constant over time, regardless of the transformations that occur within the system.
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