A neutron exerts a force on a proton which is
(a) gravitational
(b) electromagnetic
(c) nuclear
(d) weak
Choose the correct option:
1. (a) and (b)
2. (a) and (c)
3. (b) and (c)
4. (a) and (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA block of mass m is placed on a smooth inclined plane of inclination θ with the horizontal. The force exerted by the plane on the block has a magnitude
1. mg
2. mg/cosθ
3. mg cosθ
4. mg tanθ
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA block of mass m is placed on a smooth wedge of inclination θ. The whole system is accelerated horizontally so that the block does not slip on the wedge. The force exerted by the wedge on the block has a magnitude:
1. mg
2. mg/cosθ
3. mg cosθ
4. mg tanθ
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThree rigid rods are joined to form an equilateral triangle ABC of side 1 m. Three particles carrying charges 20 pC each are attached to the vertices of the triangle. The whole system is at rest in an inertial frame. The resultant force on the charged particle at A has the magnitude.
1. zero
2. 3.6 N
3. \(36\sqrt 3\)N
4. 7.2 N
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA smooth wedge A is fitted in a chamber hanging from a fixed ceiling near the earth’s surface. A block B placed at the top of the wedge takes a time T to slide down the length of the wedge. If the block is placed at the top of the wedge and the cable supporting the chamber is broken at the same instant, the block will
1. take a time longer than T to slide down the wedge
2. take a time shorter than T to slide down the wedge
3. remain at the top of the wedge
4. jump off the wedge
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe figures shows the displacement of a particle going along the X-axis as a function of time. The force acting on the particle is zero in the region
(a) AB
(b) BC
(c) CD
(d) DE
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (a) and (c)
4. (c) and (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe figure shows a heavy block kept on a frictionless surface and being pulled by two ropes of equal mass m. At t = 0, the force on the left rope is withdrawn but the force on the right end continues to act. Let F1 and F2 be the magnitudes of the forces by the right rope and the left rope on the block respectively.
1. F1 = F2 = F for t < 0
2. F1 = F2 = F + mg for t < 0
3. F1 = F, F2 = F for t > 0
4. F1 < F, F2 = F for t > 0
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe force exerted by the floor of an elevator on the foot of a person standing there is more than the weight of the person if the elevator is
(a) going up and slowing down
(b) going up and speeding up
(c) going down and slowing down
(d) going down and speeding up
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (c) and (d)
4. All of these
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology