Work & Energy - Olympiad Level MCQ, Class 9 Science


25 Questions MCQ Test Olympiad Preparation for Class 9 | Work & Energy - Olympiad Level MCQ, Class 9 Science


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This mock test of Work & Energy - Olympiad Level MCQ, Class 9 Science for Class 9 helps you for every Class 9 entrance exam. This contains 25 Multiple Choice Questions for Class 9 Work & Energy - Olympiad Level MCQ, Class 9 Science (mcq) to study with solutions a complete question bank. The solved questions answers in this Work & Energy - Olympiad Level MCQ, Class 9 Science quiz give you a good mix of easy questions and tough questions. Class 9 students definitely take this Work & Energy - Olympiad Level MCQ, Class 9 Science exercise for a better result in the exam. You can find other Work & Energy - Olympiad Level MCQ, Class 9 Science extra questions, long questions & short questions for Class 9 on EduRev as well by searching above.
QUESTION: 1

No work is done when an object moves:

Solution:
QUESTION: 2

Capacity of doing work is called:

Solution:
QUESTION: 3

Energy possessed by a body on account of position or configuration is called

Solution:
QUESTION: 4

Energy possessed by a body on account of its motion is called:

Solution:
QUESTION: 5

A stone rolls down an inclined plane. Midway during the motion, the stone has:

Solution:
QUESTION: 6

An aeroplane flying at a height of 20,000 m at a speed of 300 kmh-1 has:

Solution:
QUESTION: 7

A stone is placed on the top of a building of height 'h'. Its potential energy is directly proportional to its:

Solution:
QUESTION: 8

If a body is raised through height 'h' on the surface of earth and the energy spent is E, then for the same amount

of energy the body on the surface of moon will rise through the height of:

Solution:
we know that potential energy = mgh 
here P.E=E E=mgh 
we know that that acceleration due to gravity on moon is 1/6th ofacceleration due to gravity on earth so g/6E=mg/6h*6body wiil rise to 6h.
QUESTION: 9

The kinetic energy of a body is directly proportional to its:

Solution:
QUESTION: 10

A ball is thrown upward from a point P, reaches to the highest point Q :

Solution:
QUESTION: 11

The spring will have maximum potential energy when        

Solution: Yes because when it is pulled out and compressed then the spring rise to a height which is maximum at that point.So it will have maximum potential energy.
QUESTION: 12

When the speed of a particle is increased 3 times, its kinetic energy:

Solution:
QUESTION: 13

A force of 7N acts on an object through a distance of 8m in its own direction. The work done is :

Solution:
QUESTION: 14

A pair of bullocks exerts a force of 140N on a plough. The field being ploughed is 15m long. How much work is done in ploughing the length of the field?

Solution:
QUESTION: 15

The kinetic energy of an object of mass 'm', moving with a velocity of 5 ms-1 is 25 J. If the velocity is increased

by three times, the kinetic energy is :

Solution:
QUESTION: 16

An electric lamp consumes 1000 J of electric energy in 10 second. The power of lamp is :

Solution:
QUESTION: 17

A body of mass 20 kg, slows down from 5 ms-1 to 2 ms-1 by a retarding force. The work done by the force is:

Solution:
QUESTION: 18

A mass of 10 kg at point A on a table is moved to point B. If the line joining the A and B is horizontal, the

work done by the body is : [a = 10 ms-2]

Solution: Work done = Force × Displacement Force = mass × acceleration so, work done = mass × acceleration × Displacement W = 10 × 10 × AB = 100N × AB
QUESTION: 19

A certain household consumes 250 units of electric energy in a House. The energy consumed in mega joule is:

Solution: 1 unit=1 kwh
= 3.6×10^6 j

then,
250unit=250×3.6×10^6= 900×10^6

10^6joule = 1mega joule
so,
900×10^6joule =900MJ(Ans).
QUESTION: 20

An object of mass 40 kg (g = 10 ms-2) is raised to a height of 8 m above the ground. The gain potential

energy by the object:

Solution: Since potential energy is mgh. so
40kg × 10m/s2 × 8m=3200J
QUESTION: 21

An electric heater is rated 1500 W. The energy used by it in 10 hours is :

Solution: 150 kWh= 15000 kilowatt per hour=1500 W*10 hours=15000 kilowatt per hour
QUESTION: 22

An object of mass m is moving with a constant velocity 'u'. The work done on the object to bring it to rest is :

Solution:
QUESTION: 23

A car of mass 1500 kg is moving with a velocity of 60 kmh-2. The work done by its brakes to bring it to rest is:

Solution:
QUESTION: 24

The energy consumed (in kWh) by four devices of 500W each in 10 hours is :

Solution:
Each device consumes 500 Wh in 1 hour.
So, in 10 hours 1 device will consume 500 * 10 = 5000 Wh
Since there are 4 identical devices, the total energy consumed = 5000 * 4 = 20,000 Wh
20,000 Wh = 20 kWh.
QUESTION: 25

A locomotive exerts a force of 7500N and pulls a train by 1.5 km. The work done by the locomotive in mega joules is

Solution: