NEET Physics Past Paper DPP 1 PDF

CHAUDHARY COACHING CLASSES NEET | IIT–JEE | FOUNDATION Subject : Physics Topic : Newtons Laws of Motion (DPP_1) BASIC QUESTION RELATED TO 1...

CHAUDHARY COACHING CLASSES NEET | IIT–JEE | FOUNDATION Subject : Physics Topic : Newtons Laws of Motion (DPP_1) BASIC QUESTION RELATED TO 1 given by 𝑥 = 𝑣0 𝑡 + (2) 𝑎𝑡 2. This result CONCEPT OF FORCE AND NEWTON'S follows from :- LAWS OF MOTION (1) Newton's first law 1. A particle is in a straight line motion (2) Newton's second law with uniform velocity. A force is not (3) Newton's third law required: (4) None of these (1) To increase the speed 8. Working ofrocket or jet is based on (2) To decrease the speed (1) Newton's law (2) Newton's II law (3) To maintain the same speed (3) Newton's III law (4) All the three (4) To change the direction laws 2. Essential characteristic of equilibrium 9. When a horse pulls a wagon, the force is : that causes the horse to move forward (1) Momentum equals zero is the force (2) Acceleration equals zero (1) He exerts on the wagon (3) K.E. equals zero (2) The wagon exerts on him (4) Velocity equals zero (3) The ground exerts on him 3. When a constant force is applied to a (4) He exerts on the ground body, it moves with uniform :- 10. A man is at rest in the middle of a (1) Acceleration (2) Velocity pond on perfectly smooth ice. He can (3) Speed (4) Momentum get himself to the shore by making 4. A 5 kg mass is accelerated from rest use of Newton's to 60 m/s in 1 s. What force acts on it (1) First law (2) Second law (1) 5 × 60 N (2) (5/60) × 981 N (3) Third law (4) Law of (3) 602 × 52 N (4) (5/2) × 602 × 981N gravitation 5. A body of mass 40 g is moving with a 11. A material body 𝐴 of mass 𝑚1 exerts a constant velocity of 2 cm/s on a force on another material body B of horizontal frictionless table. The force mass m2. If the acceleration of B be on the body (in dynes) is :- a2 , the magnitude of the acceleration of 𝐴 is (1) Zero (2) 39200 (1) Zero (2) 𝑚2 𝑎2 /𝑚1 (3) 160 (4) 80 (3) 𝑚1 𝑎2 /𝑚2 (4) 𝑎2 6. A body of mass 2 kg moving on a horizontal surface with an initial 12. If the force of gravity suddenly velocity of 4 m/s comes to rest after 2 disappears s. If one wants to keep this body (1) The mass of all bodies will become moving on the same surface with a zero velocity of 4 m/s, the force required is (2) The weight of all bodies will (1) 8 N (2) 4 N (3) Zero (4) 2 N become zero 7. The distance 𝑥 covered in time 𝑡 by a (3) Both mass and weight of all bodies body having initial velocity v0 and will become zero having a constant acceleration a is (4) Neither mass nor weight of all bodies will become zero (CHAUDHARY COACHING CLASSES, AKOLA) 1 13. Two bodies of masses 4 kg and 5 kg (3) an observer at rest only are acted upon by the same force. If (4) an observer moving with uniform the acceleration of lighter body is speed only 2 m/s 2, then the acceleration of the 20. The ratio of gravitational mass to heavier body is inertial mass is equal to (1) 4.2 m/s2 (2) 3.6 m/s2 1 (1) (2) 2 (3) 1 (3) 2.4 m/s 2 (4) 1.6 m/s 2 2 14. Action and reaction :- (For a given (4) None of these system) MOMENTUM, IMPULSE, RATE OF (a) Act on the two different objects CHANGE OF MOMENTUM AND AVERAGE FORCE RELATED (b) Have opposite directions PROBLEMS (c) Have equal magnitudes 21. A balloon of mass 𝑀 is descending (d) Have zero resultant with a constant acceleration g/3. (1) a, b, c (2) b, c, d When a mass m is released from the balloon it starts rising with the same (3) All of the above acceleration g/3. The value of m is (4) None of the above (Assuming that its volume does not 15. An object with a mass 10 kg moves at change) : a constant velocity of 10 m/s. A 𝑀 𝑀 (1) (2) (3) 4 M (4) 2 M constant force then acts for 4 seconds 2 4 on the object giving it a speed of 22. Gravel is dropped onto a conveyer belt 2 m/sin opposite direction. The at a rate of 0.5 kg/s. The extra force acceleration produced is required in newton to keep the belt (1) 3 m/s 2 (2) −3 m/s2 moving at 2 m/s is (3) 0.3 m/s2 (4) −0.3 m/s 2 (1) 1 N (2) 2 N (3) 4 N (4) 0.5 N 16. The velocity acquired by a mass 𝑚 in 23. A block of metal weighing 2 kg is travelling a certain distance d starting resting on a frictionless plane. It is from rest under the action of a struck by a jet releasing water at a constant force is directly proportional rate of 1 kg/s with a speed of 5 m/s. to The initial acceleration of the block 1 will be :- (1) √m (2) m∘ (3) (4) m √m (1) 2.5 m/s2 (2) 5 m/s 2 17. Weight is defined as :- (3) 10 m/s2 (4) 15 m/s2 (1) Force of attraction exerted by the 24. A ball weighing 10 g hits a hard earth surface vertically with a speed of (2) Mass of a body 5 m/s and rebounds with the same (3) Nature of a body (4) None of these speed. The ball remains in contact with the surface for (0.01)s. The 18. A ship of mass 3 × 107 kg initially at average force exerted by the surface rest is pulled by a force of 5 × 104 N on the ball is : through a distance of 3 m. Neglecting friction, the speed of the ship at this (1) 100 N (2) 10 N (3) 1 N (4) 0.1 N moment is 25. Force-time graph for the motion of a (1) 3.0 m/s (2) 1.5 m/s body is shown in fig. Change in linear momentum between 0 to 8 s is (3) 0.1 m/s (4) 2 m/s 19. In Newton'ssecond Law 𝐹⃗ = mä (for constant mass m), 𝑎⃗ is the acceleration of the mass 𝑚 with respect to (1) any observer (1) Zero (2) 4 N − s (2) any inertial observer (3) 8 N − s (4) None (CHAUDHARY COACHING CLASSES, AKOLA) 2 26. Newton's II law of motion connects : the speed with which these are fired (1) Momentum and acceleration will be (2) Change of momentum and velocity (3) Rate of change of momentum and external force (4) Rate of change of force and momentum 27. A water jet, whose cross sectional are is 'a' strikes a wall making an angle ' 𝜃 ' with the normal and rebounds (1) 0.098 m/s (2) 0.98 m/s elastically. The velocity of water of (3) 9.8 m/s (4) 98.0 m/s density ' d ' is v. Force exerted on wall is : 33. A satellite in force free space sweeps stationary interplanetary dust at a rate (dM/dt) = +𝛼v. Here 𝑣 is the velocity. The acceleration of satellite of mass M is : (1) −2𝛼𝑣 2 /𝑀 (2) −3𝛼𝑣 2 /𝑀 (3) −𝛼𝑣 2 /𝑀 (4) −𝛼𝑣 2 34. If force 𝐹 = 500 − 100𝑡, then impulse (1) 2av 2 dcos⁡ 𝜃 (2) 2𝑎𝑣 2 𝑑sin⁡ 𝜃 as a function of time will be (3) 2 avd cos⁡ 𝜃 (4) avd cos⁡ 𝜃 (1) 500t − 50t 2 (2) 50t − 10 28. When we kick a stone, we get hurt. (3) 50 − t 2 (4) 100t 2 Due to which of the following properties of stone does it happens? 35. For a Rocket propulsion velocity of exhaust gases relative to rocket is (1) Inertia (2) Velocity 2 km/s. If mass of rocket system is (3) Reaction (4) Momentum 1000 kg , then the rate of fuel 29. A player catches a ball of 200 g consumption for a rocket to rise up moving with a speed of 20 m/s. If the with an acceleration 4.9 m/s2 will be time taken to complete the catch is (1) 12.25 kg/s (2) 17.5 kg/s 0.5 s , the force exerted on the (3) 7.35 kg/s (4) 5.2 kg/s player's hand is 36. If the force on a rocket moving in force (1) 8 N (2) 4 N (3) 2 N (4) 0 free space with an exhaust velocity of 30. A tennis ball is dropped on the floor gases 300 m/sec is 210 N , then the from a height of 20 m. It rebounds to rate of combustion of the fuel, is : a height of 5 m. The ball was in (1) 0.7 kg/s (2) 1.4 kg/s contact with the floor for 0.01 s. What was its average acceleration (3) 2.7 kg/s (4) 10.7 kg/s during the contact? (g = 10 m/s 2 ) 37. A rocket of mass 120 kg. is fired in a (1) 3000 m/s2 (2) 2000 m/s2 gravity free space is ejecting gases with velocity 600 m/s at the rate of (3) 1000 m/s2 (4) 500 m/s2 1 kg/s. What will be the initial 31. For a body of 50 kg mass, the acceleration of the rocket? velocity-time graph is shown in figure. (1) 1 m/s 2 (2) 5 m/s 2 The force acting on the body is (3) 10 m/s2 (4) 15 m/s2 (1) 25 N (2) 50 N 38. 𝑛 bullet strike per second elastically (3) 12.5 N (4) 100 N on a wall and rebound. What will be 32. A disc of mass 1.0 kg is kept floating the force exerted on the wall by horizontally in air by firing bullets of bullets if mass of each bullet is m mass 0.05 kg each vertically at it, at (1) mnv (2) 4 mnv the rate of 10 per second. If the mnv bullets rebound with the same speed, (3) 2 mnv (4) 2 (CHAUDHARY COACHING CLASSES, AKOLA) 3 39. A monkey of mass 20 kg is holding a 44. A 150 g tennis ball coming at a speed vertical rope. The rope will not break of 40 m/s is hit straight back by a bat when a mass of 25 kg is suspended to speed of 60 m/s. The magnitude of from it but will break if the mass the average force F on the ball, when exceeds 25 kg what is the maximum it is in contact for 5 ms with the bat is acceleration with which the monkey (1) 2500 N (2) 3000 N can climb up along the rope ? (g = 10 m/s2 ) (3) 3500 N (4) 4000 N 45. Ten one-rupee coins are put on top of (1) 5 m/s 2 (2) 10 m/s2 each other on a table. Each coin has a (3) 25 m/s2 (4) 2.5 m/s2 mass 𝑚. Which of the following 40. In the figure given below, the position- statements is not true? (counted from time graph of a particle of mass 0.1 kg the bottom) is shown. The impulse at 𝑡 = 2sec is (1) The force on the 6th coin due to all the coins on its top is equal to 4 mg (downwards). (2) The force on the 6th coin due to the 7th coin is 4 mg (downwards) (3) The reaction of the 6 th coin on the 7th coin is 4 mg (upwards). (4) The total force on the 10th coin is (1) 0.2 kg − m/s (2) −0.2 kg − m/s 9 mg (downwards) (3) 0.1 kg − m/s (4) −0.4 kg − m/s 46. A 140 g ball, in horizontal flight with a speed of 39.0 m/s, is struck by a bat. 41. A person is standing in an elevator. In After leaving the bat, the ball travels which situation he finds his weight in the opposite direction with speed less ? 𝑣2 = 39.0 m/s. If the impact time Δ𝑡 for (1) when the elevator moves upward the ball-bat collision is 1.20 ms , what with constant acceleration average force acts on the ball ? (2) when the elevator moves (1) 1308 N (2) 1090 N downward with constant acceleration (3) 9100 N (4) 980 N (3) when the elevator moves upward with uniform velocity (4) when the elevator moves downward with uniform velocity 42. A force of 10 N acts on a body of mass 20 kg for 10 seconds. The change in its momentum is (1) 50 kg − m/s (2) 100 kg − m/s (3) 300 kg − m/s (4) 1000 kg − m/s 43. A rocket of mass 1000 kg is to be projected vertically upwards. The gases are exhausted vertically downwards with velocity 100 m/s with respect to the rocket. What is the minimum rate of burning fuel, so as to just lift the rocket upwards against the gravitational attraction? (Take g = 10 m/s2 ) (1) 50 kg/s (2) 100 kg/s (3) 200 kg/s (4) 400 kg/s (CHAUDHARY COACHING CLASSES, AKOLA) 4