Tiêu đề NEET UG TEST SERIES TEST 02.pdf ✅

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PHYSICS TOPIC COVERED Physics: Work, Energy and Power, System of Particles and Rotational Motion, Gravitation Chemistry: Chemical Bonding and Molecular Structure, States of Matter, Thermodynamics Botany: Morphology of Flowering Plants, Anatomy of Flowering Plants, Cell, The Unit of Life Zoology: Digestion and Absorption, Breathing and Exchange of Gases Duration: 3 hr 20 min Max Marks: 720 Date: 08/05/2022 General Instructions: • The test will contain 200 Questions of Physics, Chemistry, Botany, and Zoology & The test will be objective type. (Attempt only 180). • Every subject contains two Part A- 35 Questions and Part B-15 Questions (Attempt only 10). • All 35 Questions of Part-A are Compulsory to attempt • Time given for test is 200 minutes.. • Marking is +4 for every correct answer, – 1 for every wrong answer. • You can reattempt the test in case of any technical issue. • Test will start at 2:00 pm and students can attempt test at any time of their own preferences SECTION - A 1. Two masses m1 and m2 (m1 > m2) are kept r distance apart. If they experience F1 and F2 forces due to mutual gravitational interaction then (1) 1 2 1 F F  (2) 1 2 1 F F  (3) 1 2 1 F F = (4) 1 2 1 F F 2. When a satellite revolves in an elliptical orbit, its (1) KE remains constant but PE varies (2) KE varies while PE remains constant (3) KE as well as PE remain constant (4) KE as well as PE vary with position 3. The figure gives the potential energy function U(x) for a system in which a particle is in one- dimensional motion. In which region the magnitude of the force on the particle is greatest: (1) OA (2) AB (3) BC (4) CD 4. A particle is placed at the origin and a force F = kx is acting it (where k is positive constant). If U(0) = 0, the graph of U(x) versus x will be (where U is the potential energy function): (1) (2) (3) (4) 5. A mass of 5 kg is moving along a circular path of radius 1 m. If the mass moves with 300 rev min–1 , its kinetic energy would be (1) 250  2 (2) 100  2 (3) 5  2 (4) 0 6. A particle of mass m moving in the x-direction with speed 2v is hit by another particle of mass 2 m moving in the y-direction with speed v. If the collision is perfectly inelastic, the percentage loss in the energy during the collision is close to (1) 56% (2) 62% (3) 44% (4) 50% AIM NEET Part Test-02
7. A mass m moves in a circle on a smooth horizontal plane with velocity v0 at radius R0. The mass is attached to string which passes through a smooth hole in the plane as shown. The tension in the string in increased gradually and finally mass m moves in a circle of radius R0/2. The final value of the kinetic energy is (1) 2 0 1 4 mv (2) 2 0 2mv (3) 2 0 1 2 mv (4) 2 mv0 8. A disc is rolling (without slipping) on a horizontal surface C is its centre and Q and P are two points equidistant from C. Let Vp, Vq and Vc be the magnitude of velocities of point P, Q and C respectively, then (1) VQ > VC > VP (2) VQ < VC < VP (3) 1 , 2 V V V V Q P C P (4) VQ < VC > VP 9. The gravitational field strength due to a solid sphere (mass M, radius R) varies with distance r from centre as (1) (2) (3) (4) 10. If three equal masses m are placed at the three vertices of an equilateral triangle of side lm then what force acts on a particle of mass 2 m placed at the centroid? (1) Gm2 (2) 2Gm2 (3) Zero (4) –Gm2 11. The height at which the acceleration due to gravity becomes g/9 (where g = the acceleration due to gravity on the surface of the earth) in terms of R, the radius of the earth, is (1) 9 g (2) R/2 (3) 2R (4) 2R 12. If the angular momentum of a particle of mass m rotating along a circular path of radius r with uniform speed is L, the centripetal force acting on the particle is (1) L 2 mr 3 (2) 2 L mr (3) L mr (4) 2 Lm r 13. A bob of mass m attached to an inextensible string of length l is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed ω rad/s about the vertical. About the point of suspension. (1) angular momentum is conserved. (2) angular momentum changes in magnitude but not in direction. (3) angular momentum changes in direction but not in magnitude (4) angular momentum changes both in direction and magnitude 14. A particle moves along x-axis from x = 0 to x = 5 m, under a variable force F = 7 – 2x + 3x 2 N. The work done in the process is (1) 70 J (2) 270 J (3) 35 J (4) 135 J 15. A man weighting 60 kg lifts a body of 15 kg to the top of a building 10 m high in 3 minutes. His efficiency is (1) 10% (2) 20% (3) 30% (4) 40% 16. The relation between the displacement x and the time t for a body of mass 2 kg moving under the action of a force is given by 3 3 t x = , where x is in meter and t in second. The work done by the body in the first 2 second is (1) 1600 J (2) 160 J (3) 16 J (4) 1.6 J 17. A body having a moment of inertia of 1.2 kg m2 about an axis is at rest. In order to produce in it rotational kinetic energy of 1500 J, an angular acceleration of 25 rad s–2 about that axis must be imposed for a duration of (1) 4 s (2) 10 s (3) 2 s (4) 8 s
18. A ball is confined to move along a circular path with decreasing speed. Hence (1) Its acceleration a is towards the centre (2) Its angular momentum j about the centre is conserved (3) Only the direction of j is conserved (4) It moves in a spiral path with decreasing radius 19. In an inelastic collision of two bodies, the quantities which do not change after the collision are the (1) Total mass of the colliding bodies (2) Total linear momentum (3) Total energy of the system of two bodies (4) All of these 20. A bob of mass m is suspended by a light string of length L. It is imparted a horizontal velocity v at the lowest point A. Such that it completes a semicircular trajectory in the vertical plane with the string becoming slack at point C, the ratio of kinetic energies at B and C is (1) 2/1 (2) 1/3 (3) 3/1 (4) 1/2 21. Three rods of the same mass are placed as shown in figure. What will be the coordinate of center of mass of the system? (1) , 2 2   a a     (2) , 2 2   a a     (3) 2 , 3 3   a a     (4) , 3 3   a a     22. A pendulum bob has a speed of 3 m/s at its lowest position, the pendulum is 0.5 m long. The speed of the bob when length makes an angle of 60° to the vertical is (g = 10 m/s2 ) (1) 2 m/s (2) 1 2 m/s (3) 1 3 m/s (4) 2.5 m/s 23. For a body angular velocity ˆ ˆ ˆ  = − + i j k 2 3 and radius vector is ˆ ˆ ˆ r i j k = + + , then its linear velocity about the axis through origin is (1) ˆ ˆ ˆ − + + 5 2 3 i j k (2) ˆ ˆ ˆ − − + 5 2 3 i j k (3) ˆ ˆ ˆ − + − 5 2 3 i j k (4) ˆ ˆ ˆ − + + 3 5 2 i j k 24. A uniform rod of length l and weight W is in equilibrium with the help of hinge A and string BD as shown in figure. The value of tension in the string is B A D C 0.7l l  (1) sin W T =  (2) 5 7sin W T =  (3) 7 5sin W T =  (4) 2sin W T =  25. A particle of mass m is moving with velocity 0 v v i = ˆ on a line y = . The angular momentum of the particle about origin is (1) 0 mv j  ˆ (2) 0 ˆ mv j  −( ) (3) 0 ˆ mv k  −( ) (4) 0 ˆ mv k ( ) 26. Disc releases from height h on smooth surface. Find the acceleration of center of mass of the disc. h 30° (1) 3 4 g (2) 3 g (3) 2 g (4) 2 3 g 27. Four particles of masses 2 kg, 3 kg, 4 kg and 5 kg are lying at the points (0, 0, 0), (3, 0, 0), (0, 4, 0) and (0, 0, 5) respectively, moment of inertia of this system about x-axis will be (1) 64 kg m2 (2) 125 kg m2 (3) 169 kg m2 (4) 189 kg m2