Newton's Laws of Motion PYQs Set 1 (PDF)

Set 1 of 7 · Questions 1-30 of 185

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Mere Teacher · Previous Year Questions NEET Physics · Newton's Laws of Motion · Set 1 (Q1-30)
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1. $A train is moving with a speed of 12 m / s on rails which are 1.5 m apart. To negotiate a curve radius 400 m, the height by which the outer rail should be raised with respect to the inner rail is (Given, g = 10 m / s^{2}):$ (1) $6.0 cm$ (2) $5.4 cm$ (3) $4.8 cm$ (4) $4.2 cm$ 2. $A bullet of mass 20 g moving with 500 ms^{- 1} is pierced 1 cm into a wooden block, then the retarding force experienced by the bullet is$ (1) $125 \times 10^{3} N$ (2) $750 \times 10^{3} N$ (3) $500 \times 10^{3} N$ (4) $250 \times 10^{3} N$ 3. $A stone of mass 2 kg is tied at one end of a string of length 2 m and is whirled in a horizontal circle. If the string can withstand a maximum tension of 64 N, then the permissible maximum number of rotations per minute is$ (1) $19$ (2) $\frac{60}{π}$ (3) $\frac{152}{3} π$ (4) $\frac{120}{π}$ 4. $In a lift moving up with an acceleration of 5 m s^{- 2}, a ball is dropped from a height of 1.25 m . The time taken by the ball to reach the floor of the lift is ...... (nearly) (g = 10 m s^{- 2}))$ (1) $0.3 second$ (2) $0.2 second$ (3) $0.16 second$ (4) $0.4 second$ 5. $The vector sum of two forces is perpendicular to their vector differences. In that case, the forces$ (1) $cannot be predicted$ (2) $always are equal to each other$ (3) $are equal to each other in magnitude$ (4) $are not equal to each other in magnitude$ 6. $A force (2 i + j - k) N acts on a body, which is initially at rest. At the end of 20 s the velocity of the body is (4 i + 2 j - 2 k) ms^{- 1}, then the mass of the body is$ (1) $8 kg$ (2) $10 kg$ (3) $5 kg$ (4) $4.5 kg$ 7. $A person with machine gun can fire 50 g bullets with a velocity of 240 m / s . A 60 kg tiger moves towards him with a velocity of 12 m / s . In order to stop the tiger in track, the number of bullets the person fires towards the tiger is$ (1) $50$ (2) $60$ (3) $70$ (4) $80$ 8. $A particle moves in x - y plane under the influence of a force F such that its linear momentum is p (t) = i cos (kt) - j sin (kt) . If k is constant, the angle between F and p will be:$ (1) $\frac{π}{2}$ (2) $\frac{π}{3}$ (3) $\frac{π}{4}$ (4) $\frac{π}{6}$ 9. $Which of the following groups of forces could be in equilibrium$ (1) $3 N, 4 N, 5 N$ (2) $4N, 5 N, 10 N$ (3) $30N, 40 N, 80 N$ (4) $N, 3 N, 5 N$ 10. $A body subjected to three concurrent forces is found to be in equilibrium. The resultant of any two forces:$ (1) $Is equal to third force$ (2) $Is opposite to third force$ (3) $Is collinear with the third force$ (4) $All of these$ 11. $A ball of mass 0.15 kg is dropped from a height 10 m, strikes the ground and rebounds to the same height. The magnitude of impulse imparted to the ball is nearly (g = 10 m / s^{2}) [NEET 2021]$ (1) $0$ (2) $4.2 kg - m / s$ (3) $2.1 kg - m / s$ (4) $1.4 kg - m / s$ 12. $Three concurrent co-planar forces 1 N, 2 N and 3 N acting along different directions on a body:$ (1) $Can keep the body in equilibrium if 2 N and 3 N act at right angle$ (2) $Can keep the body in equilibrium if 1 N and 2 N act at right angle$ (3) $Cannot keep the body in equilibrium$ (4) $Can keep the body in equilibrium if 1 N and 3 N act at an acute angle$ 13. $A person throws balls into air vertically upward in regular intervals of time of one second. The next ball is thrown when the velocity of the ball thrown earlier becomes zero. The height to which the balls rise is ... (Assume, g = 10 m s^{- 2})$ (1) $5 m$ (2) $10 m$ (3) $7.5 m$ (4) $20 m$ 14. $A particle moves along a circle of radius r with constant tangential acceleration. If the velocity of the particle is v at the end of second revolution, after the revolution has started then the tangential acceleration is$ (1) $\frac{v ^{2}}{8 πr}$ (2) $\frac{v ^{2}}{6 πr}$ (3) $\frac{v ^{2}}{4 πr}$ (4) $\frac{v ^{2}}{2 πr}$ 15. $An object with mass 5 kg is acted upon by a force, F = (- 3 i + 4 j) N . If its initial velocity at t = 0 is v = (6 i - 12 j) m s^{- 1}, the time at which it will just have a velocity along y -axis is$ (1) $2 s$ (2) $5 s$ (3) $15 s$ (4) $10 s$ 16. $A body of weight 200 N is suspended from a tree branch through a chain of mass 10 kg. The branch pulls the chain by a force equal to (if g = 10 m / s^{2}) :$ (1) $300 N$ (2) $100 N$ (3) $150 N$ (4) $200 N$ 17. $A body of mass 4 kg is accelerated upon by a constant force, travels a distance of 5 m in the first second and a distance of 2 m in the third second. The force acting on the body is$ (1) $6 N$ (2) $8 N$ (3) $2 N$ (4) $4 N$ 18. $A player caught a cricket ball of mass 150 g moving at a speed of 20 m / s . If the catching process is completed in 0.1 s, the magnitude of force exerted by the ball on the hand of the player is:$ (1) $150 N$ (2) $3 N$ (3) $30 N$ (4) $300 N$ 19. $A lorry is moving on a smooth circular path of radius 50 m with a velocity of 20 ms^{- 1} . Then the banking angle of the road is (Acceleration due to gravity = 10 ms^{- 2})$ (1) $tan^{- 1} \frac{5}{4}$ (2) $tan^{- 1} \frac{4}{5}$ (3) $tan^{- 1} \frac{2}{5}$ (4) $tan^{- 1} \frac{5}{2}$ 20. $A machine gun fires bullets of mass 30 g with velocity of 1000 m / s . The man holding the gun can exert a maximum force of 300 N on it. How may bullets can he fire per second at most?$ (1) $3$ (2) $6$ (3) $10$ (4) $9$ 21. $An object with mass 500 g moves along x -axis with speed v = 4 x m / s . The force acting on the object is:$ (1) $8 N$ (2) $4 N$ (3) $5 N$ (4) $6 N$ 22. $The resultant of two forces 3P and 2Pis R. If the first force is doubled then the resultant is also doubled. The angle between the two forces is$ (1) $6 0^{o}$ (2) $12 0^{o}$ (3) $7 0^{o}$ (4) $18 0^{o}$ 23. $A cricket player catches a ball of mass 120 g moving with 25 m / s speed. If the catching process is completed in 0.1 s then the magnitude of force exerted by the ball on the hand of player will be (in SI unit):$ (1) $24$ (2) $12$ (3) $25$ (4) $30$ 24. $Find the apparent weight of a body of mass 0.1 kg falling with an acceleration of 10 ms^{- 2} . (g = 10 ms^{- 2})$ (1) $1 kg - wt$ (2) $2 kg - wt$ (3) $0$ (4) $0.5 kg - wt$ 25. $A body of mass ' m' is travelling with a velocity ' u'. When a constant retarding force ' F' is applied, it comes to rest after travelling a distance ' s_{1}'. If the initial velocity is ' 2 u', with the same force ' F, the distance travelled before it comes to rest is ' s_{2} .' Then$ (1) $s_{2} = 2 s_{1}$ (2) $s_{2} = s_{1} 2$ (3) $s_{2} = s_{1}$ (4) $s_{2} = 4 s_{1}$ 26. $Sand is being dropped on a conveyer belt at the rate of Mkg / s . The force necessary to keep the belt moving with a constant velocity of vm / s will be$ (1) $\frac{Mv}{2} newton$ (2) $zero$ (3) $Mv newton$ (4) $2 Mv newton$ 27. $Which of the following sets of concurrent forces may be in equilibrium$ (1) $F_{1} = 3 N, F_{2} = 5 N, F_{3} = 9 N$ (2) $F_{1} = 3 N, F_{2} = 5 N, F_{3} = 1 N$ (3) $F_{1} = 3 N, F_{2} = 5 N, F_{3} = 15 N$ (4) $F_{1} = 3 N, F_{2} = 5 N, F_{3} = 6 N$ 28. $Consider the following statements A and B. Identify the correct choice in the given answers. (A) In an inelastic collision, there is no loss in kinetic energy during collision. (B) During a collision, the linear momentum of the entire system of particles is conserved if there is no external force acting on the system.$ (1) $Both A and B are wrong.$ (2) $Both A and B are correct.$ (3) $A is wrong and B is correct.$ (4) $A is correct and B is wrong.$ 29. $A ball of mass 0.2 kg moving with a speed of 20 m / s is brought to rest in 0.1 s . The average force applied to the ball is$ (1) $20 N$ (2) $30 N$ (3) $40 N$ (4) $60 N$ 30. $One end of a string of length l is connected to a particle of mass m and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed v, the net force on the particle (directed towards the centre) is (T is the tension in the string)$ (1) $T + \frac{m v ^{2}}{l}$ (2) $0$ (3) $T$ (4) $T - \frac{m v ^{2}}{l}$