MDCAT Physics Chapter 2 Work and energy Online Test With Answers

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MDCAT Physics Chapter 2 Work and energy Online Test

Sr. # Questions Answers Choice
1 When a person lifts a body from ground work done by lifting force is? Positive Negative Zero Half of positive maximum
2 Initially, four identical uniform blocks, each of mass m and thickness h, are spread on a table How much work is done on the blocks in stacking them on top of one another? 2 mgh 3 mgh 4mgh 6mgh
3 An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplied by the motor in watts is 20 200 2 10
4 A motor boat is travelling with a speed of 3.0 m/sec. If the force on it due to water flow is 500 N, the power of the boat is 150 KW 1.5 KW heat energy chemical energy
5 The energy stored in wound watch spring is K.E. P.E. heat energy chemical energy
6 If the stone is thrown up vertically and return to ground, its potential energy is maximum during the upward journey during the upward journey at the maximum height at the bottom
7 Two bodies moving towards each other collide and move away in opposite directions. There is some rise in temperature of bodies because a part of the kinetic energy is converted into heat energy electrical energy nuclear energy mechanical energy
8 If the K.E. of a body is increased by 300%, its momentum will increase by: 100 % 150 % √300% 175 %
9 If the momentum of a body is increased n times, its kinetic energy increases: n times 2 n times √𝑛 times n 2 time
10 The body at rest may have: Energy Momentum Speed Velocity
11 A light and a heavy body have equal momenta. Which one has greater K.E? The light body The heavy body The K.E are equa Data is incomplete
12 Work done in raising a box depends on: How fast it is raised The strength of the man The height by which it is raised None of the above
13 Which of the following is a unit of energy? unit whatt Horse Power None of the above
14 In an explosion a body breaks up into two pieces of unequal masses. In this: Both parts will have numerically equal momentum Lighter part will have more momentum Heavier part will have more momentum Both parts will have equal kinetic energy
15 A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is 5 J 350 J 100 J 3430 J
16 The energy which an -e acquires when accelerated through a potential difference of 1 volt is called? 1 Joule 1 Electron volt 1 Erg 1 Watt
17 A force 𝑭 = (𝟓𝒊Ė‚+ 𝟑𝖩Ė‚) newton is applied over a particle which displaces it from its origin to the point 𝒓 = (𝟐𝒊Ė‚− 𝟏𝖩Ė‚) meters. The work done on the particle is: – 7 joules +13 joules + 7 joules +11 joules
18 A body of mass m kg is lifted by a man to a height of one meter in 30 sec. Another man lifts the same mass to the same height in 60 sec. The work done by them are in the ratio 1: 2 1: 1 2: 1 4: 1
19 You lift a heavy book from the floor of the room and keep it in the book-shelf having a height 2 m. In this process you take 5 seconds. The work done by you will depend upon: Mass of the book and time taken Weight of the book and height of the book-shelf Height of the book-shelf and time taken Mass of the book, height of the book-shelf and time taken
20 A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 joules, the angle which the force makes with the direction of motion of the body is? 0 Degree 30 Degree 60 Degree 90 Degree
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