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AIPMT Physics 1997 Presentation Transcript

  • 1. aipmt–Past papers
    PHYSICS- UNSOLVED PAPER - 1997
  • 2. SECTION – I (Total Marks : 50)
    Single Correct Answer Type
    There are five parts in this question. Four choices are given for each part and one of them is correct. Indicate you choice of the correct answer for each part in your answer-book by writing the letter (a), (b), (c) or (d) whichever is appropriate
  • 3. 01
    Problem
    A cylindrical tube, open at both ends has fundamental frequency f in air. The tube is dipped vertically in water, so that half of it is in water. The fundamental frequency of air column is now
    f/2
    3f/4
    2f
    f.
  • 4. Problem
    02
    A body moves a distance of 10 m along a straight line under the action of a 5 N force. If the work done is 25 J, then angle between the force and direction of motion of the body is
    600
    750
    300
    450.
  • 5. Problem
    03
    Tesla is the unit of
    Electric field
    Magnetic field
    Electric flux
    Magnetic flux
  • 6. Problem
    04
    A bar magnet of magnetic moment M is cut into two parts of equal length. The magnetic moment of each part will be
    M
    2M
    zero
    0.5 M.
  • 7. Problem
    05
    Two SHM’s with same amplitude and time period, when acting together in perpendicular directions with a phase difference of , give rise to
    Straight motion
    Elliptical motion
    Circular motion
    None of these
  • 8. Problem
    06
    Three copper wires of lengths and cross-sectional areas as ( , A), (2 ,A/2) and ( /2,2A). Resistance is minimum in
    Wire of cross-sectional area 2 A
    Wire of cross-sectional area 1/2 A
    Wire of cross-sectional area A
    Same in all three cases.
  • 9. Problem
    07
    If and are the electric permittivity and magnetic permeability in a free space, ε and μare the corresponding quantities in medium, the index and refraction of the medium is
     a.
    b.
    c.
    d.
  • 10. Problem
    08
    A positively charged particle moving due East enters a region of unifo magnetic field directed vertically upwards. This particle will
    Move in a circular path with a decreases speed
    Move in a circular path with a uniform speed
    Get deflected in vertically upward direction
    Move in circular path with an increased speed.
  • 11. Problem
    09
    The diode used in the circuit shown in the figure has a constant voltage drop at 0.5 V at all current s and a maximum power rating of 100 mille-watts. What should be the value of the resistor R, connected in series and with diode for obtaining maximum current?
    6.76 Ω
    20 Ω

    5.6 Ω
  • 12. Problem
    10
    A sample of gas expands from volume V1 to V2. The amount of work done by the gas is greatest, when the expansion is
    Adiabatic
    Equal in all cases
    Isothermal
    Isobaric
  • 13. Problem
    11
    An electromagnetic radiation of frequency n, wavelength λ traveling with velocity v in air, enters a glass slab of refractive index μ. The frequency, wavelength and velocity of light in the glass slab will be respectively
    a.
    b.
    c.
    d.
  • 14. Problem
    12
    Standing waves are produced in 10 m long stretched string. If the string vibrates in 5 segments and wave velocity is 20 m/s, the frequency is
    5 Hz
    10 Hz
    2 Hz
    4 Hz
  • 15. Problem
    13
    The primary winding of a transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an A.C. supply 20 V, 50 Hz. The secondary will have an output of
    2 V, 50 Hz
    2 V, 5 Hz
    200 V, 50 Hz
    200 V, 500 Hz.
  • 16. Problem
    14
    Two parallel wires in free space are 10 cm apart and each carries a current of 10 A in the same direction. The force exerted by one wire on the other, per meter length is
    2 x 10-4 N repulsive
    2 x 10-7 N repulsive
    2 x 10-4 attractive
    2 x 10-7 N attractive
  • 17. Problem
    15
    Due to earth’s magnetic field, the charged cosmic rays particles
    Can never reach the pole
    Can never reach the equator
    Require greater kinetic energy to reach the equator than pole
    Require less kinetic energy to reach the equator than pole.
  • 18. Problem
    16
    The period of revolution of planet A around the sun is 8 times that of B. The distance of A from the sun is how many times greater than that of B from the sun?
    4
    5
    2
    3.
  • 19. Problem
    17
    A metal ball of mass 2 kg moving with speed of 36 km/h has a head on collision with a stationary ball of mass 3 kg. If after collision, both the balls move together, then the loss in K.E. due to collision is
    100 J
    140 J
    40 J
    60 J.
  • 20. Problem
    18
    A couple produces
    Linear and rotational motion
    No motion
    Purely linear motion
    Purely rotational motion.
  • 21. Problem
    19
    Two bodies of masses m and 4m are moving with equal K.E. The ratio of their linear momentums is
    1 : 2
    1 : 4
    4 : 1
    1 : 1 .
  • 22. Problem
    20
    A (100 W, 200 V) bulb is connected to a 160 volts supply. The power consumption would be
    100 W
    125 W
    64 W
    80 W.
  • 23. Problem
    21
    In an a.c. circuit with phase voltage V and current I, the power dissipated is
    a. V.I
    b. Depends on phase angle between V and I
    c.1/2xV.I
    d.1/√2xV.I
  • 24. Problem
    22
    The current in the following circuit is
    2/3 A
    1 A
    1/8 A
    2/9 A
  • 25. Problem
    23
    Kirchhoff’s first law, i.e. at a junction, deals with the conservation of
    Momentum
    Angular momentum
    Charge
    Energy.
  • 26. Problem
    24
    From the graph between current (I) and voltage (V) is shown below. Identify the portion corresponding to negative resistance
    CD
    DE
    AB
    BC.
  • 27. Problem
    25
    The correct relationship between the two current gains and in a transistor is
    a.α=β/1+β
    b. α=1+β/ β
    c. β= α/1+ α
    d. β= α/1- α
  • 28. Problem
    26
    The following truth –table belongs to which one of the following four gates?
    XOR
    NOR
    OR
    NAND
  • 29. Problem
    27
    A force of 6 N acts on a body at rest and 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
    7 seconds
    5 seconds
    10 seconds
    8 seconds
  • 30. Problem
    28
    A shell, in flight, explodes into four unequal parts. Which of the following is conserved?
    Potential energy
    Momentum
    Kinetic energy
    Both ‘a’ and ‘c’
  • 31. Problem
    29
    Which of the following is used as a moderator in nuclear reaction?
    Cadmium
    Plutonium
    Uranium
    Heavy water.
  • 32. Problem
    30
    The center of mass of system of particles does not depend on
    Position of the particles
    Relative distances between the particles
    Masses of the particles
    Forces acting on the particle.
  • 33. Problem
    31
    The escape velocity of a body on the surface of the earth is 11.2 km/s. If the earth’s mass increases to twice its present value and radius of the earth becomes half, the escape velocity becomes
    22.4 km/s
    44.8 km/s
    5.6 km/s
    11.2 km/s.
  • 34. Problem
    32
    If a car at rest accelerates uniformly to a speed of 144 km/h in 20 sec, it covers a distance of
    1440 cm
    2980 cm
    20 m
    400 m.
  • 35. Problem
    33
    A straight wire of a diameter 0.5 mm carrying a current of 1 A is replaced by another wire of 1 mm diameter carrying the same current. The strength of the magnetic field far away is
    One-quarter of the earlier value
    No charge
    Twice the earlier value
    One-half of the earlier value .
  • 36. Problem
    34
    Which of the following statement is correct?
    The photocurrent increases with intensity of light
    The stopping potential increases with increase of incident light
    The current in photocell increases with increasing frequency
    The photocurrent is proportional to the applied voltage.
  • 37. Problem
    35
    One kilowatt hour is equal to
    36 x 10-5 J
    36 x 10-5 J
    36 x 105 J
    36 x 103 J.
  • 38. Problem
    36
    Find the torque of a force acting at the point Pressure
    a.
    b.
    c.
    d.
  • 39. Problem
    37
    If two bulbs, whose resistances are in the ratio of 1 : 2 are connected in series, the power dissipated in them has the ratio of
    2 : 1
    1 : 4
    1 : 1
    1 : 2
  • 40. Problem
    38
    The ball whose kinetic energy is E is thrown at an angle of 450 with the horizontal. Its K.E. at the highest point of its flight will be
     a. E/√2
    b. 0
    c. E
    d. E/2
  • 41. Problem
    39
    A black body is at a temperature of 500 K. it emits energy at a rate which is proportional to
    (500)3
    (500)4
    500
    (500)2
  • 42. Problem
    40
    The kinetic energy of an electron. Which is accelerated in the potential difference of 100 volts, is
    416.6 cal
    6.636 cal
    1.602 x 10-17 J
    1.6 x 104 J.
  • 43. Problem
    41
    The energy of the ground electronic state of hydrogen atom is –13.6 eV. The energy of the first excited state will be
    -27.2 eV
    -52.4 eV
    -3.4 eV
    -6.8 eV.
  • 44. Problem
    42
    To obtain a p-type germanium semiconductor, it must be doped with
    Indium
    Phosphorus
    Arsenic
    Antimony.
  • 45. Problem
    43
    When hydrogen atom is in its first excited level, its radius is ……….. of the Bohr radius.
    Twice
    4 times
    same
    half.
  • 46. Problem
    44
    The most penetrating radiation out of the following are
     
    β -rays
    γ -rays
    X-rays
    α -rays
  • 47. Problem
    45
    If the length of a simple pendulum is increased by 2 % then the time period
    Increases by 1%
    Decreases by 1 %
    Increases by 2%
    Decreases by 2 %.
  • 48. Problem
    46
    The position x of a particle varies with time, (t) as The acceleration will be zero at time t is equal to
    a. a/3b
    b. zero
    c. 2a/3b
    d. a/b
  • 49. Problem
    47
    The focal length of converging lens is measured for violet, green and red colours. It is respectively fv,fg,fr. We will get
    fv < fr
    fg > fr
    fv = fg
    fg > fr
  • 50. Problem
    48
    An astronomical telescope of tenfold angular magnification has length of 44 cm. The focal length of the objective Is
    44 cm
    440 cm
    4 cm
    40 cm.
  • 51. Problem
    49
    Identify the vector quantity among the following
    Distance
    Angular momentum
    Heat
    Energy.
  • 52. Problem
    50
    The efficiency of a Carnot engine operating with reservoir temperature of 1000C and –230C will be
    a.373+250/373
    b. 373-250/373
    c. 100+23/100
    d. 100-23/100
  • 53. For solution visit www.vasista.net