The minimum work done in pulling up a block of wood weighing \(2\) kN for a length of \(10\) m on a smooth plane inclined at an angle of \(15^\circ\) with the horizontal is (given: \(\mathrm{sin}15^\circ=0.2588)\):
1. \(4.36\) kJ
2. \(5.17\) kJ
3. \(8.91\) kJ
4. \(9.82\) kJ

Subtopic:  Work done by constant force |
 80%
From NCERT
PMT - 2003
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A body of mass 6kg is under a force which causes displacement in it given by S=t24 metres where t is time. The work done by the force in 2 seconds is-

(1) 12 J

(2) 9 J

(3) 6 J

(4) 3 J

Subtopic:  Work Done by Variable Force |
 72%
From NCERT
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A particle moves from position r1=3i^+2j^6k^ to position r2=14i^+13j^+9k^ under the action of force 4i^+j^+3k^N. The work done will be 

(1) 100 J

(2) 50 J

(3) 200 J

(4) 75 J

Subtopic:  Concept of Work | Work Done by Variable Force | Power |
 83%
From NCERT
PMT - 2002
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A uniform chain of length 2m is kept on a table such that a length of 60cm hangs freely from the edge of the table. The total mass of the chain is 4kg. What is the work done in pulling the entire chain on the table?

(1) 7.2 J

(2) 3.6 J

(3) 120 J

(4) 1200 J

Subtopic:  Gravitational Potential Energy |
 67%
From NCERT
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A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that 

(1) Its velocity is constant

(2) Its acceleration is constant

(3) Its kinetic energy is constant

(4) It moves in a straight line

Subtopic:  Work done by constant force |
 57%
From NCERT
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Two bodies of masses 1 kg and 5 kg are dropped gently from the top of a tower. At a point 20 cm from the ground, both the bodies will have the same 

(1) Momentum

(2) Kinetic energy

(3) Velocity

(4) Total energy

Subtopic:  Concept of Work |
 61%
From NCERT
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A particle moves under the effect of a force F = Cx from x = 0 to x = x1. The work done in the process is 

(1) Cx12

(2) 12Cx12

(3) Cx1

(4) Zero

Subtopic:  Work Done by Variable Force |
 83%
From NCERT
PMT - 1982
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A cord is used to lower vertically a block of mass M by a distance d with constant downward acceleration g4. Work done by the cord on the block is 

(1) Mgd4

(2) 3Mgd4

(3) 3Mgd4

(4) Mgd 

Subtopic:  Gravitational Potential Energy |
 59%
From NCERT
PMT - 1972
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Two springs have their force constant as k1 and k2(k1>k2). When they are stretched by the same force 

(1) No work is done in case of both the springs

(2) Equal work is done in case of both the springs

(3) More work is done in case of second spring

(4) More work is done in case of first spring

Subtopic:  Elastic Potential Energy |
 65%
From NCERT
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The potential energy of a certain spring when stretched through a distance ‘S’ is 10 joule. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance ‘S’ will be:

(1) 30

(2) 40

(3) 10

(4) 20

Subtopic:  Elastic Potential Energy |
 50%
From NCERT
PMT - 2002
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