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PHYSICS TEST SERIES 03 2016 AIPMT/JEE(MAIN) 1.The test is of 1 hour duration. 2.The Test Booklet consists of 30 questions. The maximum marks are 90. 3.There is one part in the question paper. The distribution of marks is as under for each correct response. Physics (90 marks) – Question No. 1 to 30 consist of THREE (3) marks each for correct response. (-1) mark will be awarded for each wrong response. 1. A particle of mass M and charge Q moving with torque needed to maintain the needle in this position will be: subjected to a uniform transverse magnetic field of induction B. The work done by the field when the particle completes one full circle is: (a) velocity v describes a circular path of radius R when 2 R (c) BQ 2R Mv (a) 2R 2. (b) zero (c) 6. Curie temperature is the temperature above which : (a) a ferromagnetic material becomes para- magnetic (b) a paramagnetic material becomes diamagnetic (c) a ferromagnetic material becomes diamagnetic (d) a paramagnetic material becomes ferro- magnetic 7. A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m/s2, the reading of the spring balance will be : (a) 24 N (b ) 74 N (c) 15 N (d) 49 N 8. The length of a wire of a potentiometer is 100 cm, and the emf of its stand and cell is E volt. It is employed to measure the emf of a battery whose internal resistance velocity 10 ms–1 along the x – axis enters a region along the negative z–axis. If the charged particle continues moving along the x–axis, the magnitude of B is: 3. (a) 103 Wb/m2 (b) 105Wb/m2 (c) 1016 Wb/m2 (d) 10–3 Wb/m2 A thin rectangular magnet suspended freely has a period of oscillation equal to T. Now it is broken into two equal halves (each having half of the original length) and one piece is made to oscillate freely in the same field. If its period of oscillation is T’, the ratio T’ / T is: 1 2 (a) 2 1 (b) 2 (c) 2 1 (d) 4 (d) 2W The magnetic lines of force inside a bar magnet : (a) are from north-pole to south-pole of the magnet (b) do not exist (c) depend upon the area of cross-section of the bar magnet (d) Are from south-pole to north-pole of the magnet A particle of charge –16 x 10–18 coulomb moving with axis and an electric field of magnitude 104 V/m is 3/2 W (b) W 5. (d) BQv 2R where a magnetic field of induction B is along the y – 3W is 0.5 . If the balance point is obtained at l = 30 cm 4. A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 600. The from the positive end, the emf of the battery is : (a) 300E 100.5 (b) 30 E 100 0.5 30( E 0.5i ) , where I is the current in the (c) 100 potentiometer wire 9. (d) 30E 100 A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of : (a) each of these decreases (b) copper strip increases and that of germanium decreases (c) copper strip decreases and that of germanium increases (d) Each of these increases 10. Consider telecommunication through optical fibers. Which of the following statements is not true ? (a) Optical fibres can be of graded refractive index (b) Optical fibres are subjected to electro- magnetic interference from outside (c) Optical fibres have extremely low transmission loss (d) Optical fibres may have homogeneous core with a suitable cladding 11. The thermo-emf of a thermocouple is 25 V / 0 C at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 10-5 A, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is : (a) 160C (b) 120C (c) 80C (d) 200C 12. The negative Zn pole of Daniell cell, sending a constant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is : (a) 0.180 g (b) 0.141 g (c) 0.126 g (d) 0.242 g 13. Dimensions of meaning, are : (a) [L-1T] (c) [L2T-2] 1 0 0 , where symbols have their usual (b) [L2T2] (d) [LT-1] 14. A circular disc X of radius R is made from an iron plate of thickness t, and another disc Y of radius 4R is made from an iron plate of thickness t/4. Then the relation between the moment of inertia lx and ly is : (a) ly = 32lx (b) ly= 16lx (c) ly = lx (d) ly= 64lx 15. The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become : (a) 10 hour (b) 80 hour (c) 40 hour (d) 20 hour 16. A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then the new angular momentum is : (a) L/4 (b) 2L (c) 4L (d) L/2 17. Which of the following relations has the least wavelength ? (a) rays (b) rays (c) rays (d) X-rays 18. When U238 nucleus originally at rest, decays by emitting an alpha particle having a speed u, the recoil speed of the residual nucleus is : (a) 4u 238 (b) 4u 234 (c) 4u 234 (d) 4u 238 19. Two spherical bodies of mass M and 5M and radii R and 2R respectively are released in free space with initial separation between their centres equal to 12R. If they attract each other due to gravitational force only, then the distance covered by the smaller body just before collision is : (a) 2.5R (b) 4.5R (c) 7.5R (d) 1.5R 20. The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the : (a) crystal structure (b) variation of the number of charge carries with temperature (c) type of bonding (d) variation of scattering mechanism with temperature (b) momentum and Planck’s constant (c) stress and Young’s modulus (d) speed and ( 0 0 ) 1 / 2 25. Three forces start acting simultaneously on a particle moving with velocity v . These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity : (a) less than v (b) greater than v (c) v in the direction of largest force BC 21. A car moving with a speed of 50 km/hr, can be stopped by brakes after at least 6 m. If the same car is moving at a speed of 100 km/hr, the minimum stopping distance is : (a) 12 m (b) 18 m (c) 24 m (d) 6 m 22. A boy playing on the roof of a 10 m high building throws a ball with a speed of 10 m/s at an angle of 300 with the horizontal. How far from the throwing point will the ball be at the height of 10 m from the ground ? [g = 10 m/s2, sin 300 = ½, cos 300 = (a) 5.20 m (c) 2.60 m 3/2] (c) 4.33 m (d) 8.66 m 23. An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A, the value of the required shunt is : (a) 0.33 (b) 0.3 (c) 0.9 (d) 0.09 24. The physical quantities not having same dimensions are : (a) torque and work (d) v ,remaining unchanged 26. If the electric flux entering and leaving an enclosed surface respectively is 1 and 2 , the electric charge inside the surface will be (a) (2 1 ) 0 (b) (1 2 ) / 0 (c) (2 1 ) / 0 (d) (1 2 ) 0 27. A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is : (a) 20 N (c) 100 N (b) 50 N (d) 2 N 28. A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 s. Then the coefficient of friction is : (a) 0.02 (b) 0.03 (c) 0.06 (d) 0.01 29. Consider the following two statements : (a) Linear momentum of a system of particle is zero. (b) Kinetic energy of a system of particles is zero . Then : (a) A does not imply B and B does not imply A (b) A implies B but B does not imply A (c) A does not imply B but B implies A (d) A implies B and B implies A 30. Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon: (a) the rates at which currents are changing in the two coils (b) relative position and orientation of the two coils (c) the materials of the wires of the coils (d) the currents in the two coils