Test Details

Work and Energy

Jan 11, 2:00 PM

90 minutes

Jan 11, 3:30 PM

40.0 marks

MCQ

20 questions

MOTION PHYSICS CLASSES

Class Details

Maths

Science

Social Science

10th

Maths

Science

Social Science

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Question Text

Question 1 :
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

Question 2 :
A girl having mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of $4 ms^{–1}$ by applying a force. The trolley comes to rest after traversing a distance of 16 m. How much work is done by the girl?

Question 3 :
Energy exists in nature in several forms such as kinetic energy, potential energy, heat energy, chemical energy etc. The sum of the kinetic and potential energies of an object is called its mechanical energy.

Question 4 :
Write an expression for the work done when a force is acting on an object in the direction of its displacement.

Question 5 :
A light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has a larger kinetic energy?

Question 6 :
A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not?

Question 7 :
The sum of the potential energy and kinetic energy of the object would be the same at all points. That is, potential energy + kinetic energy = constant.

Question 8 :
A porter lifts a luggage of 15 kg from the ground and puts it on his head 1.5 m above the ground. Calculate the work done by him on the luggage.

Question 9 :
A battery lights a bulb. Describe the energy changes involved in the process.

Question 10 :
Compare the power at which a 250 g squirrel climbing up on a tree at a rate of $0.5 ms^{–1}$ is moving upwards against the force of gravity. $(given g = 10 ms^{–2})$

Question 11 :
If the object is starting from its stationary position, that is, u = 0, then work done, W = ?

Question 12 :
What are the two conditions that are really essential for a work to be done?

Question 13 :
1 J is the amount of work done on an object when a force of 1 N displaces it by ____ along the line of action of the force.

Question 14 :
A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

Question 15 :
Kamali is preparing for examinations. She spends lot of time in studies. She reads lots of books. In common parlance, she is ‘working hard’. But is it really a work?

Question 16 :
Is it possible that an object is in the state of accelerated motion due to external force acting on it, but no work is being done by the force.

Question 17 :
The energy used in one hour at the rate of 1kW is called 1 kW h.

Question 18 :
Avinash can run with a speed of $8 ms^{-1}$ against the frictional force of 10 N, and Kapil can move with a speed of $3 ms^{–1}$ against the frictional force of 25 N. Who is more powerful and why?

Question 19 :
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?

Question 20 :
Work done on an object is defined as the magnitude of the force multiplied by the distance moved by the object in the direction of the applied force. The unit of work is joule:$ 1 joule = 1 newton \times 1 metre.$ Is the statement true or false?

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