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IIT JEE Physics 2002

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    • 1. IIT JEE –Past papers
      PHYSICS - UNSOLVED PAPER - 2002
    • 2. SECTION – I
      Single Correct Answer Type
      • This section contains 25 multiple choice questions. Each question has four choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
    • 01
      Problem
      A simple pendulum is oscillating without damping .When the displacement of the bob is less than maximum, its acceleration vector is correctly shown in:
      a.
      b.
      c.
      d.
    • 3. Problem
      02
      A wooden block ,with a coin placed on its top, floats in water as shown in figure. The distances and are shown thereafter some time the coin falls into the water. Then
      decreases and increases
      increases and decreases
      both and increase
      both and decrease
    • 4. Problem
      03
      A cylinder roils up an inclined plane, reaches some height, and then rolls down (without slipping throughout these motions).The directions of the frictional force acting on the cylinder are:
      up the incline while ascending and down the incline while descending
      up the incline while ascending as well as descending
      down the incline while ascending and up the incline while descending
      down the incline while ascending as well as descending
    • 5. Problem
      04
      A circular platform is free to rotate in a horizontal plane about a vertical axis passing through its center. A tortoise is sitting at the edge of the platform . Now,the platform is given an angular velocity .When the tortoise moves along a chord of the platform with a constant velocity(with respect to the platform),the angular velocity of the platform will vary with time t as
      a.
      b.
      c.
      d.
    • 6. Problem
      05
      Two blocks of masses 10 kg and 4 kg are connected by a spring of negligible mass and placed on a frictionless horizontal surface. An impulse gives a velocity of 14 m/s to the heavier block in the direction of the lighter block. The velocity of the center of mass is
      30 m/s
      20 m/s
      10 m/s
      5 m/s
    • 7. Problem
      06
      A particle, which is constrained to move along the -axis, is subjected to a force in the same direction which varies with the distance of the particle from the origin as . Here k and a are positive constants .For ,the functional form of the potential energy of the particle is
      a.
      b.
      c.
      d.
    • 8. Problem
      07
      A siren placed at a railway platform is emitting sound of frequency 5 kHz. A passenger sitting in a moving train A records a frequency of 5.5 kHz while the train approaches the siren. During his return journey in different train B he records a frequency of 6.0 kHz while approaching the same siren. The ratio of the velocity of train B to that of train A is
      242/252
      2
      5/6
      11/6
    • 9. 08
      Problem
      A sonometer wire resontes with a given tuning fork forming standing waves with five antnodes between the two bridges when a mass of 9 kg is suspended from the wire. When this mass is replaced by a mass M, the same positions of the bridges .The value of M is
      25 kg
      5 kg
      12.5kg
      (1/25)kg
    • 10. Problem
      09
      An ideal spring with spring-constant k is hung from the ceiling and a block of mass M is attached to its lower end. The mass is released with the spring initially outstretched. Then the maximum extension in the spring is
      4
      2
    • 11. Problem
      10
      A geo-stationary satellite orbits around the earth in a circular orbit of radius 36000 km.Then ,the time period of a spy satellite orbiting a few hundred kilometers above the earth’s surface will approximately be
      (1/2)h
      1h
      2h
      4h
    • 12. Problem
      11
      The effective resistance between points P and Q of the electrical circuit shown in the figure is
      a.
      b.
      c.
      d.
    • 13. 12
      Problem
      A particle of mass m and charge q moves with a constant velocity along the positive direction. It enters a region containing a uniform magnetic field B directed along the negative z direction, extending from .The minimum value of required so that the particle can just enter the region
      is
      a.
      b.
      c.
      d.
    • 14. Problem
      13
      Two equal point charges are fixed at on the -axis Another point charge Q is placed at the origin. The change in the electrical potential energy of Q, when it its displaced by a small distance along the -axis, is approximately proportional to
      a.
      b.
      c.
      d.
    • 15. Problem
      14
      As long straight wire along the z-axis carries a current in the negative z direction. The magnetic vector field at a point having coordinates in the z=0 plane is
      a.
      b.
      c.
      d.
    • 16. Problem
      15
      As shown in the figure ,P and Q are two coaxial conducting loops separated by some distance. When the switch S is closed, a clockwise current flows in p (as seen by E)and an induced current . flows in Q.The switch remains closed for a long time. When S is opened current flows in Q.Then the directions of
      (as seen by E)are:
      respectively clockwise and anti-clockwise
      both clockwise
      both anti-clockwise
      respectively anti-clockwise and clockwise
    • 17. Problem
      16
      A 100 W bulb and two 60 W bulbs and are connected to 250V source, as shown in the powers of the bulbs respectively .Then
      a.
      b.
      c.
      d.
    • 18. 17
      Problem
      Two identical capacitors have the same capacitance Cone of them is charged to potential and the other .The negative ends of the capacitors are connected together.Wehn the positive ends are also connected, the decrease in energy of the combined system is
      a.
      b.
      c.
      d.
    • 19. Problem
      18
      A short-circuited coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to the quadrupled and the wire radius halved, the electrical power dissipated would be
      halved
      the same
      doubled
      quadrupled
    • 20. Problem
      19
      The magnetic field lines due to a bar magnet are correctly shown in
      a.
      b.
      c.
      d.
    • 21. Problem
      20
      An ideal gas is taken through the cycle , as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J,the work done by the gas in the process is
      -5 J
      -10 J
      -15 J
      -20 J
    • 22. Problem
      21
      Which of the following graphs correctly represents the variation of for an ideal gas at constant temperature?
      a.
      b.
      c.
      d.
    • 23. Problem
      22
      The potential difference applied to an X-ray tube is 5kV and th current through it is 3.2 marten the number of electrons striking the target per second is
      a.
      b.
      c.
      d.
    • 24. Problem
      23
      An ideal black-body at room temperature is thrown into a furnace. It is observed that
      initially it is the darkest body and at later times the brightest
      it is the darkest body at all times
      it cannot be distinguished at all times
      initially it is the darkest body and at later times it cannot be distinguished
    • 25. Problem
      24
      A hydrogen atom and a ion are both in the second excited state. If
      are their respective electronic angular moment ,and
      their respective energies ,then
      a.
      b.
      c.
      d.
    • 26. Problem
      25
      The half-life of is 100 .The time taken for the radioactivity of a sample
      to decay to 1/16 th of its initial vale is
      400
      6.3
      40
      300
    • 27. Problem
      26
      Which of the following processes represents a gamma-decay?
      a.
      b.
      c.
      d.
    • 28. Problem
      27
      An observer can see through a pin-hole the top end of a thin rod of height h, placed as shown in the figure. The beaker height is 3h, and its radius h. When the beaker is filled with a liquid unto a height 2h,he can see the lower end of the rod. Then the refractive index of the liquid is
      a.
      b.
      c.
      d.
    • 29. Problem
      28
      Which one of the following spherical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are as given in the diagrams.
      a.
      b.
      c.
      d.
    • 30. Problem
      29
      In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams(wavelength ),the intensity at the position where the entrap maximum occurred previously remains unchanged. The minimum thickness of the glass-plat is
      2
      2
    • 31. Problem
      30
      Two plane mirrors A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections(including the first one)before it emerges out is
      28
      30
      32
      34
    • 32. FOR SOLUTION VISIT WWW.VASISTA.NET