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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA person-1 stands on an elevator moving with an initial velocity of 'v' & upward acceleration 'a'. Another person-2 of the same mass m as person-1 is standing on the same elevator. The work done by the lift on the person-1 as observed by person-2 in time 't' is:
1.
2.
3. 0
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA block of mass m is placed in an elevator moving down with an acceleration . The work done by the normal reaction on the block as the elevator moves down through a height h is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPrefer Books for Question Practice? Get NEETprep's Unique MCQ Books with Online Audio/Video/Text Solutions via Telegram Bot
NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the diagram shown, force \(F\) acts on the free end of the string. If the weight \(W\) moves up slowly by distance \(h,\) then work done on the weight by the string holding it will be: (pulley and string are ideal)
1. \(Fh\)
2. \(2Fh\)
3. \(Fh/2\)
4. \(4Fh\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe position of a particle \((x)\) varies with time \((t)\) as \(x = (t - 2)^2\), where \(x\) is in meters and \(t\) is in seconds. Calculate the work done during \(t=0\) to \(t=4\) s if the mass of the particle is \(100~\text{g}.\)
1. \(0.4~\text{J}\)
2. \(0.2~\text{J}\)
3. \(0.8~\text{J}\)
4. zero
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe position-time graph of a particle of mass \(2\) kg is shown in the figure. Total work done on the particle from \(t=0\) to \(t=4\) s is:
1. \(8\) J
2. \(4\) J
3. \(0\) J
4. can't be determined
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA bicyclist comes to a skidding stop in \(10\) m. During this process, the force on the bicycle due to the road is \(200\) N is directly opposed to the motion. The work done by the cycle on the road is:
1. | \(+2000\) J | 2. | \(-200\) J |
3. | zero | 4. | \(-20000\) J |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA cord is used to vertically lower a block of mass m by a distance d at a constant downward acceleration of . The work done by the chord on the block will be:
1. mgd
2. -mgd
3. mgd
4. -mgd
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. | \(75~\text{J}\) | 2. | \(55~\text{J}\) |
3. | \(85~\text{J}\) | 4. | \(65~\text{J}\) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology