MCQ Work and Energy | Online Test | NCERT Class 9

#1. 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 & half kinetic energy

d) more kinetic & less potential energy

#2. Which is correct => the work done on an object does not depend upon the

a) displacement

b) angle between force & displacement

c) initial velocity of the object

d) force applied

#3. Diameter of an iron sphere of mass 10 kg & an aluminium sphere of 3.5 kg is same. Both are dropped simultaneously from a tower. When they are 15 m above the ground, the have the same

a) momentum

b) potential energy

c) kinetic energy

d) acceleration

#4. 1 horse power is equal to

a) 74600 watt

b) 746 watt

c) 74.60 watt

d) 7460 watt

#5. A girl is carrying a school bag of 3 kg mass on her back & moves 200 m on a levelled ground. The work done against the gravitational force will be (g=10 m/s^2)

a) 6x10^3 J

b) 6 J

c) 0.6 J

D) zero

#6. A car is accelerated on a levelled road & attains a velocity of 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

#7. When a body falls freely towards the earth, then its total energy

a) increases

b) decreases

c) remains constant

d) first increases then decreases

#8. The angle between the force & displacement in case of negative work

a) 45⁰

b) 0⁰

c) 180⁰

d) 90⁰

#9. Water stored in a dam possesses

a) potential energy

b) kinetic energy

c) electrical energy

d) no energy

#10. Which is not the unit of energy

a) joule

b) kilowatt

c) kilowatt-hour

d) newton-metre

Finish

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