Tiêu đề AIM NEET Part Test 11.pdf ✅

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[2] 6. A particle of mass m, initially at rest, is acted upon by a variable force F for a brief interval of time T. It begins to move with a velocity u after the force stops acting. F is shown in the graph as a function of time. The curve is a semicircle. (1) 2 0 2  = F u m (2) 2 8  = T u m (3) 0 4  = F T u m (4) 0 2 = F T u m 7. A heavy uniform chain lies on a horizontal table- top. If the coefficient of friction between the chain and table surface is 0.25, then the maximum fraction of length of the chain, that can hang over one edge of the table is (1) 20% (2) 25% (3) 35% (4) 15% 8. An engine pump is used to pump a liquid of density  continuously through a pipe of cross-sectional area A. If the speed of flow of the liquid in the pipe is v, then the rate at which kinetic energy is being imparted to the liquid is (1) 1 3 2 A v (2) 1 2 2 A v (3) 1 2 A v (4) Av 9. A force of 5 N acts on a 15 kg body initially at rest. The work done by the force during the first second of motion of the body is (1) 5 J (2) 5 J 6 (3) 6 J (4) 75 J 10. Three particles of masses 1.0 kg, 2.0 kg and 3.0 kg are placed at the corners A, B and C respectively of an equilateral triangle ABC of edge 1 m. Taking AB as the x-axis and A as the origin, the location of centre of mass of the system is (1) 7 3 , 12 4       m m (2) 5 3 , 12 4       m m (3) 1 3 , 12 4       m m (4) None of these 11. A sphere (1) of mass m moving with a constant velocity u hits another stationary sphere (2) of the same mass. If e is the coefficient of restitution, then ratio of velocities of the two spheres after collision will be V1/V2) (1) 1 1   −     + e e (2) 1 1   +     − e e (3) 1 1   +     + e e (4) 1 1   −     + e e 12. A thin wire of length L and uniform linear mass density  is bent into a circular loop with centre at O as shown in the figure. The moment of inertia of the loop about the XX axis is (1) 3 2 8   L (2) 3 2 16   L (3) 3 2 5 16   L (4) 3 2 3 8   L 13. Four solid objects, each with the same mass and radius, are spinning freely with the same angular momentum. Which object requires the most work to stop it? (1) A solid sphere spinning about a diameter (2) A hollow sphere spinning about a diameter (3) A solid disk spinning about an axis perpendicular to the plane of the disk and through the centre (4) A hoop spinning about an axis along a diameter 14. An artificial satellite moving in circular orbit around the earth has a total (kinetic + potential) energy E0. Its PE is (1) –E0 (2) 1.5 E0 (3) 2E0 (4) E0 15. There are two wires of same material and same length while the diameter of second wire is 2 times the diameter of first wire, then ratio of extension produced in the wires by applying same load will be (1) 1 : 1 (2) 2 : 1 (3) 1 : 2 (4) 4 : 1 16. The temperature at which the r.m.s. speed of hydrogen molecules is equal to escape velocity on earth surface, will be (1) 1060 K (2) 5030 K (3) 8270 K (4) 10063 K
[3] 17. Efficiency of a Carnot engine is 50% when temperature of outlet is 500 K. In order to increase efficiency up to 60% keeping temperature of intake the same what is temperature of outlet (1) 200 K (2) 400 K (3) 600 K (4) 800 K 18. If the displacement of a particle executing SHM is given by y = 0.30 sin(220t + 0.64) in metre, then the frequency and maximum velocity of the particle is (1) 35 Hz, 66 m/s (2) 45 Hz, 66 m/s (3) 58 Hz, 113 m/s (4) 35 Hz, 66 m/s 19. A train moves towards a stationary observer with 34 m/s. The train sounds a whistle and its frequency registered by the observer is f1. If the train’s speed is reduced to 17 m/s. The frequency registered is f2. If speed of sound in air is 340 m/s, then the ratio 1 2 f f is (1) 18/19 (2) 1/2 (3) 2 (4) 19/18 20. Electric charge q, 2q and – 3q are placed at the corners of an equilateral triangle ABC of side L. The magnitude of electric dipole moment of the system is (1) ql (2) 2 qL (3) ( 3) qL (4) 7qL 21. If each resistance in the figure is of 18  then reading of ammeter is (1) 2.5 A (2) 10 A (3) 5 A (4) 9 A 22. A cell of internal resistance 1.5  and of e.m.f. 1.5 volt balances 500 cm on a potentiometer wire. If a wire of 13.5  is connected across the cell, then the balance point will shift (1) to 50 cm (2) to 550 cm (3) to 450 cm (4) None of the above 23. When 30 C charge is given to an isolated conductor of capacitance 5 F. If this conductor is now connected to other isolated conductor of total charge 50 C and capacity 10 F. Find out ratio of final charges on conductors. (1) 5 10 2 1   = F F Q Q (2) 5 10 1 5   = F F Q Q (3) 5 10 1 3   = F F Q Q (4) 5 10 1 2   = F F Q Q 24. If the resistance of the upper half of a rigid circular loop is twice of that of the lower half, the magnitude of magnetic induction at the centre is equal to (1) Zero (2) 0 6  i a (3) 0 2  i a (4) 0 12  i a 25. A bar magnet is situated on a table along east-west direction in the magnetic field of earth. The number of neutral points, where the magnetic field is zero, are (1) 2 (2) 0 (3) 1 (4) 4 26. In the diagram shown if a bar magnet is moved along the common axis of two single turn coils A and B in the direction of arrow (1) Current is induced only in A and not in B (2) Induced current in A and B are in the same direction (3) Current is induced only in B and not in A (4) Induced currents in A and B are in opposite directions 27. A point source of electromagnetic radiation has an average power output of 800 W. The maximum value of electric field at a distance 3.5 m from the source will be (1) 56.7 V/m (2) 62.6 V/m (3) 39.3 V/m (4) 47.5 V/m