Test Details

Work and Energy

MCQ

Feb 04, 12:41 PM

20 minutes

Feb 04, 1:01 PM

30.0 marks

MCQ

15 questions

Anshu Bhardwaj

Class Details

Science

ScienceIX C

Science

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Question Text

Question 1 :
Can any object have momentum even if its mechanical energy is zero?

Question 2 :
What is the work to be done to increase the velocity of a car from 30 km $h^{-1}$ to 60 km $h^{-1}$ if the mass of the car is 1500 kg?

Question 3 :
A donkey is carrying a load on its back. Is it a work?

Question 5 :
The kinetic energy of an object of mass, m moving with a velocity of 5 m $s^{-1}$ is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

Question 6 :
A green plant is carrying out photosynthesis. Is it a work?

Question 7 :
An electric heater is rated 1500 W. How much energy does it use in 10 hours?

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

Question 10 :
The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of water falls from it in a minute. Calculate the equivalent power if all this energy can be utilized? $(g = 10 ms^{–2})$

Question 11 :
A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not?

Question 12 :
Find the energy in kW h consumed in 10 hours by four devices of power 500 W each.

Question 13 :
Work done on an object by a force would be zero if the displacement of the object is zero.

Question 14 :
A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force?

Question 15 :
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 ($g=10 ms^{-2}$)

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