1-NEWTON_S LAWS OF MOTION QUESTION.docx

**NEET : CHAPTER WISE TEST-4** **SUBJECT :- PHYSICS DATE\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....** **CLASS :- 11^th^ NAME\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...** **CHAPTER :- NEWTON\'S LAWS OF MOTION SECTION\...\.....

**NEET : CHAPTER WISE TEST-4** **SUBJECT :- PHYSICS DATE\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\....** **CLASS :- 11^th^ NAME\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...** **CHAPTER :- NEWTON\'S LAWS OF MOTION SECTION\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...\...** **(SECTION-A)** **1.** When a body is stationary- \(A) There is no force acting on it \(B) The force acting on it not in contact with it \(C) The combination of forces acting on it balances each other \(D) The body is in vaccum **2.** Newton\'s Third law is equivalent to the- \(A) law of conservation of linear momentum \(B) law of conservation of angular momentum \(C) law of conservation of energy \(D) law of conservation of energy and mass **3.** In the case of horse pulling a cart, the force that causes the horse to move forward is the force that : \(A) the horse exerts on the ground \(B) the horse exerts on the cart \(C) the ground exerts on the horse \(D) the cart exerts on the horse **4.** Two forces of 6N and 3N are acting on the two blocks of 2kg and 1kg kept on frictionless floor. What is the force exerted on 2kg block by 1kg block ? \(A) 1N (B) 2N (C) 4N (D) 5N **5.** A force of 6N acts on a body at rest of mass 1 kg. During this time, the body attains a velocity of 30 m/s. The time for which the force acts on the body is- \(A) 10 seconds (B) 8 seconds \(C) 7 seconds (D) 5 seconds **6.** A bird weighing 1 kg sitting on the base of a wire mesh cage weighing 1.5 kg. The bird starts flying in the cage. The weight of the bird cage assembly will be \(A) 1250 g (B) 1500 g \(C) 1750 g (D) None of these **7.** A boy having a mass equal to 40 kilograms is standing in an elevator. The force felt by the feet of the boy will be greatest when the elevator (g = 9.8 metre/sec^2^)- \(A) Stands still \(B) Moves downwards at a constant velocity of 4 metre/sec. \(C) Accelerates downward with an acceleration equal to 4 metres/sec^2^ \(D) Accelerates upward with an acceleration equal to 4 metres/sec^2^ **8.** A man weighs 80 kg. He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of 5 m/s^2^. What would be the reading on the scale ? (g = 10 m/s^2^) \(A) 800 N (B) 1200 N \(C) Zero (D) 400 N **9.** A uniform thick rope of length 5m is kept on frictionless surface and a force of 5N is applied to one of its end. Find tension in the rope at 1m from this end- \(A) 1N (B) 3N (C) 4N (D) 5N **10.** For the arraangement shown in figure, pulleys and strings are ideal Find out the acceleration of 2 kg block \(A) (B) \(C) (D) **11.** The velocity of end 'A' of rigid rod placed between two smooth vertical walls moves with velocity 'u' along vertical direction. The velocity of end 'B' of that rod, rod always remains in contact with the vertical walls. \(A) u cot θ (B) u tan θ \(C) u sin θ (D) u cos θ **12.** The linear momentum P of a body varies with time and is given by the equation P = x + yt^2^ where x and y are constants. The net force acting on the body for a one dimensional motion is proportional to- \(A) t^2^ (B) a constant \(C) (D) t **13.** The average force necessary to stop a hammer having momentum 25 N-s in 0.05 second is- \(A) 25 N (B) 50 N \(C) 1.25 N (D) 500 N **14.** The mass of ship is 2 × 10^7^ kg. On applying a force of 25 × 10^5^ N, it is displaced through 25m. After the displacement, the speed acquired by the ship will be: \(A) 12.5 m/s (B) 5 m/s \(C) 3.7 m/s (D) 2.5 m/s **15.** A body of mass 0.1 kg attains a velocity of 10 ms^--1^ in 0.1 s. The force acting on the body is : \(A) 10 N (B) 0.01 N \(C) 0.1 N (D) 100 N **16.** A diwali rocket is ejecting 0.05 kg of gases per second at a velocity of 400 m/sec. The accelerating force on the rocket is \(A) 20 dynes (B) 20 N \(C) 22 dynes (D) 1000 N **17.** A player takes 0.1 s in catching a ball of mass 150 g moving with velocity of 20 m/s. The force imparted by the ball on the hands of the player is : \(A) 0.3 N (B) 3 N \(C) 30 N (D) 300 N **18.** A lift of mass 1000 kg is moving upwards with an acceleration of 1 m/s^2^. The tension developed in the string, which is connected to lift is : (g = 9.8 m/s^2^) \(A) 9800 N (B) 10800 N \(C) 11000 N (D) 10000 N **19.** A body of mass 0.1 kg attains a velocity of 10 ms^--1^. in 0.1 s. The force acting on the body is : \(A) 10 N (B) 0.01 N \(C) 0.1 N (D) 100 N **20.** A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope ? (g = 10 m/s^2^) \(A) 25 m/s^2^ (B) 2.5 m/s^2^ \(C) 5 m/s^2^ (D) 10 m/s^2^ **21.** A spring toy weighing 1 kg on a spring balance suddenly jumps upward. A boy standing near the toy notices that the scale of the balance reads 1.05 kg. In this process the maximum acceleration of the toy is- (g = 10m sec^--2^) \(A) 0.05 m sec^--2^ (B) 0.5 m sec^--2^ \(C) 1.05 m sec^--2^ (D) 1 m sec^--2^ **22.** A dynamometer D, is connected with to bodies of mass M = 6 kg and m = 4kg. If two forces F = 20 N & F = 10 N are applied on masses according to figure then reading of the dynamometer will be - \(A) 10 N (B) 20 N \(C) 6 N (D) 14 N **23.** A body of mass 5*kg* is suspended by a spring balance on an inclined plane as shown in figure. The spring balance measure \(A) 50 *N* (B) 25 *N* \(C) 500 *N* (D) 10 *N* **24.** A block of mass m~1~ = 2 kg on a smooth inclined plane at angle 30° is connected to a second block of mass m~2~ = 3 kg by a cord passing over a frictionless pulley as shown in fig. The acceleration of each block is- (assume g = 10 m/sec^2^) \(A) 2 m/sec^2^ (B) 4 m/sec^2^ \(C) 6 m/sec^2^ (D) 8 m/sec^2^ **25.** A body, under the action of a force , acquires an acceleration of 1 ms^--2^. The mass of this body must be \(A) (B) 10 kg \(C) 20 kg (D) **26.** The mass of a lift is 500 kg. What will be the tension in its cable when it is going up with an acceleration of 2.0 m/s^2-^ \(A) 5000 N (B) 5600 N \(C) 5900 N (D) 6200 N **27.** A balloon of gross weight w newton is falling vertically downward with a constant acceleration a(\