A man of mass 60 kg is standing on the ground and holding a string passing over a system of ideal pulleys. A mass of 10 kg is hanging over a light pulley such that the system is in equilibrium. The force exerted by the ground on the man is: (g = acceleration due to gravity)
1. 20 g
2. 45 g
3. 40 g
4. 60 g
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA small coin is kept at a distance r from the centre of a gramophone disc rotating at an angular speed . The minimum coefficient of friction for which a coin will not slip is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA plank with a box on it at one end is gradually raised at the other end. As the angle of inclination with the horizontal reaches 30°, the box starts to slip and slides 4.0 m down the plank in 4.0 s. The coefficients of static and kinetic friction between the box and the plank, respectively, will be:
1. 0.6 and 0.6
2. 0.6 and 0.5
3. 0.5 and 0.6
4. 0.4 and 0.3
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA block "A" of mass 7 kg is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass 3 kg at the other end. The acceleration of the system will be: (given g = 10 ms–2)
1. 100 ms–2
2. 3 ms–2
3. 10 ms–2
4. 30 ms–2
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo masses, M and m, are attached to a vertical axis by weightless threads of combined length l. They are set in rotational motion in a horizontal plane about this axis with constant angular velocity ω. If the tensions in the threads are the same during motion, the distance of M from the axis is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA motorcycle is going on an overbridge of radius R. The driver maintains a constant speed. The normal force on the motorcycle as it ascends the overbridge will be:
1. increases.
2. decreases.
3. remains the same.
4. fluctuates erratically.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA block is placed on a rough horizontal plane. A time dependent horizontal force, F=kt, acts on the block. The acceleration time graph of the block is :
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe figure shows a rod of length 5 m. Its ends, A and B, are restrained to moving in horizontal and vertical guides. When the end A is 3 m above O, it moves at 4 m/s. The velocity of end B at that instant is:
1. 2 m/s
2. 3 m/s
3. 4 m/s
4. 0.20 m/s
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIf the block is being pulled by the rope moving at speed v as shown, then the horizontal velocity of the block is:
1. v
2. vcos
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
In the given figure, spring balance is massless, so the reading of spring balance will be:
1. 2 kg
2. 3.5 kg
3. 2.9 kg
4. 3.1 kg
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology