AMU –PAST PAPERSPHYSICS- UNSOLVED PAPER - 2002
SECTION – I   Single Correct Answer Type         There are five parts in this question. Four choices are given for each ...
01   Problem     Suitable impurities are added to a semiconductor depending on its use. This is     due to :     a. Increa...
02   Problem     When are electron and a position at rest are annihilated, then the number of     photons produced is :   ...
03   Problem     A convex lens of focal length 20 cm produces a real image twice the size of the     object. Then the dist...
04   Problem     The separation between the plates of a parallel plate capacitor is d and area of     each plate is A, whe...
05   Problem     When a potential difference V is applied across a conductor at temperature T, the     thermal speed of el...
06   Problem     If the electron in hydrogen atom jumps from third orbit to second orbit, the     wavelength of the emitte...
07   Problem     In Young’s double slit experiment, the fringe width is found to be 0.4 mm. If the     whole apparatus is ...
08   Problem     The final image formed by a microscope is :     a. Virtual and magnified     b. Real and magnified     c....
09   Problem     A 10  thick wire is stretched so that its length becomes 3 times. Then the new     resistance of the wir...
10   Problem     Five resistance have been connected in the manner shown in figure. The     equivalent resistance between ...
11   Problem     Eddy currents may be reduced by using :     a. Laminated cores of steel     b. Laminated core of soft iro...
12   Problem     The magnetic energy stored in an inductor coil varies with magnetic field     a. B     b. B2          1  ...
13   Problem     The specific resistance of wire :     a. Varies with its length     b. Varies with its cross section     ...
14   Problem     Retentively is maximum for :     a. Steel     b. Soft iron     c. Copper     d. Silver
15   Problem     The charactivity is maximum for:     a.   Amplitude     b. Velocity     c.   Frequency     d. wavelength
16   Problem     The focal length of a concave mirror is :     a. Maximum for red colour     b. Maximum for violet colour ...
17   Problem     A force F is applied on a body and it moves with a velocity  , the power will be     :     a. F.       ...
18   Problem     For the same kinetic energy, the momentum is maximum for :     a. An electron     b. A proton     c. A de...
19   Problem     Four spheres each of diameter 2a and mass M are placed with their centers on     the four corners of a sq...
20   Problem     A ring of radius r and mass m rotates about an axis passing through its centre     and perpendicular to i...
21   Problem     If the speed of the rotation of earth increases, then the weight of the body.     a. Increases     b. Dec...
22   Problem     An organ pipe P1 closed at one end and vibrating in its first overtone and another     pipe P2 open at bo...
23   Problem     The equation of a wave traveling in a string is given as y = 3 cos  (100t -x). Its     wavelength is :  ...
24   Problem     A star is moving away from the earth with a velocity of 105 m/s. The shift in the     spectral line of wa...
25   Problem     Two sound wave are   y  a sin t  kx  y  a cos(t  kx)   , the phase difference     between the two...
26   Problem     The velocity of sound in air is not affected by changes in :     a. Moisture contents in air     b. Tempe...
27   Problem     The velocity of light in a medium of refractive index 3/2 is :     a.   2 x 108 m/s     b. 4 x 108 m/s   ...
28   Problem     The image formed by a convex mirror is :     a. Virtual, erect and diminished     b. Virtual, erect and e...
29   Problem     In a reflecting astronomical telescope, parabolic mirrors are used because they     are free from” :     ...
30   Problem     To remove the chromatic aberration, combination of lens should be such that :     a. FR + FV = 0     b. R...
31   Problem     For a long cylindrical source of light, the illuminance E on a screen varies with     distance r as :    ...
32   Problem     The radius of curvature of curved surface of a plano-convex lens is 15 cm and     refractive index of len...
33   Problem     A beam of monochromatic blut light of wavelength 4200 Å in air travels in water     (refractive index 4/3...
34   Problem     Rays of light fall on a glass plate of refractive index . If the angle between     reflected and refracte...
35   Problem     A plane glass slab is placed over letters of different colours which letters     appears to be raised mos...
36   Problem     When an ideal gas is heated at constant pressure, the fraction of the heat energy     supplied, which inc...
37   Problem     The second law of thermodynamics is concerned with the :     a. Conservation of energy     b. Conservatio...
38   Problem     At which of the following temperature would the molecules of a gas have twice,     the average kinetic en...
39   Problem     An iron piece falls from a height of 1 km on the ground. If all the energy is     converted into heat, th...
40   Problem     If a given mass of gas occupies a volume 100m3 at one atmospheric pressure and     temperature of 1000C, ...
41   Problem     Work done by a system is zero in :     a. Isothermal process     b. Adiabatic process     c. Isochoric pr...
42   Problem     1 mole of a monoatomic gas is first heated at constant volume at 1000C. The     change in internal energy...
43   Problem     If the degrees of freedom of a gas are f then the ratio of its specific heats C p is                     ...
44   Problem     In bringing an electron towards another electron, electrostatic potential energy     of system :     a. D...
45   Problem     Viscosity is most closely related to :     a. Friction     b. Adhesive molecular force     c. Cohesive mo...
46   Problem     The substances which are repelled by a magnet are called :     a. Diamagnetic substances     b. Paramagne...
47   Problem     The time constant of L-R circuit is :     a. LR          L     b.   R          R     c.   L           1  ...
48   Problem     In a full wave rectifier, the rms value of AC component of the waves :     a. Equal to DC value     b. Mo...
49   Problem     The minimum wavelength of X-rays produced by electrons accelerated by a     potential difference of V vol...
50   Problem     According to Bohr’s theory the relation between principal quantum number n     and radius (r) of orbit : ...
FOR SOLUTIONS VISIT WWW.VASISTA.NET
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AMU - Physics - 2002

  1. 1. AMU –PAST PAPERSPHYSICS- UNSOLVED PAPER - 2002
  2. 2. SECTION – I 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. 3. 01 Problem Suitable impurities are added to a semiconductor depending on its use. This is due to : a. Increase its electrical resistivity b. Increase its electrical conductivity c. Increase its life d. Enable it to tolerate higher voltage
  4. 4. 02 Problem When are electron and a position at rest are annihilated, then the number of photons produced is : a. One b. Two c. Four d. Any arbitray number
  5. 5. 03 Problem A convex lens of focal length 20 cm produces a real image twice the size of the object. Then the distance of the object from the lens is : a. 10 cm b. 20 cm c. 30 cm d. 40 cm
  6. 6. 04 Problem The separation between the plates of a parallel plate capacitor is d and area of each plate is A, when a slab of material of dielectric constant K and thickness t is introduced between the plates, the capacitance becomes : 0 A  1 a. d  t 1    K 0 A  1 b. d  t 1    K 0 A  1 d  t 1   c.  K 0 A  1 d  t 1  d.  K 
  7. 7. 05 Problem When a potential difference V is applied across a conductor at temperature T, the thermal speed of electrons is proportional to : a. T b. T c. V d. O
  8. 8. 06 Problem If the electron in hydrogen atom jumps from third orbit to second orbit, the wavelength of the emitted radiation is given by a. 36   5R 56 b.   3R 5 c.   R R d.   6
  9. 9. 07 Problem In Young’s double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is dipped in water of refractive index 4/3, without disturbing the arrangement, the new fringe width will be : a. 0.30 mm b. 0.40 mm c. 0.53 mm d. 0.2 m
  10. 10. 08 Problem The final image formed by a microscope is : a. Virtual and magnified b. Real and magnified c. Real and diminished d. Virtual and diminished
  11. 11. 09 Problem A 10  thick wire is stretched so that its length becomes 3 times. Then the new resistance of the wire is : a. 10  b. 30  c. 90  10 d. 9 
  12. 12. 10 Problem Five resistance have been connected in the manner shown in figure. The equivalent resistance between points X and Y will be equal to : a. 10  b. 20  c. 60  20 d.  3
  13. 13. 11 Problem Eddy currents may be reduced by using : a. Laminated cores of steel b. Laminated core of soft iron c. Thick piece of cobalt d. Thick piece of nickel
  14. 14. 12 Problem The magnetic energy stored in an inductor coil varies with magnetic field a. B b. B2 1 c. B d. B0
  15. 15. 13 Problem The specific resistance of wire : a. Varies with its length b. Varies with its cross section c. Varies with its mass d. Is independent of length, cross section and mass of the wire
  16. 16. 14 Problem Retentively is maximum for : a. Steel b. Soft iron c. Copper d. Silver
  17. 17. 15 Problem The charactivity is maximum for: a. Amplitude b. Velocity c. Frequency d. wavelength
  18. 18. 16 Problem The focal length of a concave mirror is : a. Maximum for red colour b. Maximum for violet colour c. Maximum for yellow colour d. Same for all colours
  19. 19. 17 Problem A force F is applied on a body and it moves with a velocity  , the power will be : a. F.  F b.  c. F.  2 F d. 2
  20. 20. 18 Problem For the same kinetic energy, the momentum is maximum for : a. An electron b. A proton c. A deutron d. An particle
  21. 21. 19 Problem Four spheres each of diameter 2a and mass M are placed with their centers on the four corners of a square of side b. The moment of inertia of the system about any side of the square will be : 8 a. 5 Ma2 + 2Mb2 8 b. 5 Ma2 + Mb2 8 c. 5 Ma2 + 4Mb2 d. 8 Ma2 + 16Mb2 5
  22. 22. 20 Problem A ring of radius r and mass m rotates about an axis passing through its centre and perpendicular to its plane, its kinetic energy is : a. mr  b. 1 mr  2 2 c. mr2  2 1 d. 2 mr2  2
  23. 23. 21 Problem If the speed of the rotation of earth increases, then the weight of the body. a. Increases b. Decreases c. Remains unchanged d. May increases or decrease
  24. 24. 22 Problem An organ pipe P1 closed at one end and vibrating in its first overtone and another pipe P2 open at both ends vibrating in its second overtone are in resonances. The ratio of length of pipes P1 and P2 is : a. 1 b. 1/2 c. 1/3 d. 3/4
  25. 25. 23 Problem The equation of a wave traveling in a string is given as y = 3 cos  (100t -x). Its wavelength is : a. 3 cm b. 100 cm c. 2 cm d. 5 cm
  26. 26. 24 Problem A star is moving away from the earth with a velocity of 105 m/s. The shift in the spectral line of wavelength 5700 Å as observed on the earth is : a. 0.75 Å b. 1.75 Å c. 1.9 Å d. 2.01 Å
  27. 27. 25 Problem Two sound wave are y  a sin t  kx  y  a cos(t  kx) , the phase difference between the two waves is : a.  /2 b.  /4 c.  d. 0
  28. 28. 26 Problem The velocity of sound in air is not affected by changes in : a. Moisture contents in air b. Temperature of air c. The atmospheric pressure d. The composition of air
  29. 29. 27 Problem The velocity of light in a medium of refractive index 3/2 is : a. 2 x 108 m/s b. 4 x 108 m/s c. 5 x 105 m/s d. 9 x 105 m/s
  30. 30. 28 Problem The image formed by a convex mirror is : a. Virtual, erect and diminished b. Virtual, erect and enlarged c. Real, inverted and diminished d. Real, inverted and enlarged
  31. 31. 29 Problem In a reflecting astronomical telescope, parabolic mirrors are used because they are free from” : a. Spherical aberration b. Chromatic aberration c. Spherical and chromatic aberration both d. No aberration
  32. 32. 30 Problem To remove the chromatic aberration, combination of lens should be such that : a. FR + FV = 0 b. RR + FV c. FR < FV d. FR – FV = 0
  33. 33. 31 Problem For a long cylindrical source of light, the illuminance E on a screen varies with distance r as : a. E  r-2 b. E  r-1 c. E  r0 d. E  r2
  34. 34. 32 Problem The radius of curvature of curved surface of a plano-convex lens is 15 cm and refractive index of lens material is 1.6. The power of the lens will be : a. 1.66 D b. 4 D c. - 1.0 D d. - 3.75 D
  35. 35. 33 Problem A beam of monochromatic blut light of wavelength 4200 Å in air travels in water (refractive index 4/3) its wavelength in water will be : a. 2800 Å b. 3150 Å c. 4000 Å d. 5600 Å
  36. 36. 34 Problem Rays of light fall on a glass plate of refractive index . If the angle between reflected and refracted rays is 900, then the angel of incidence is : a. sin-1( μ ) b. cos-1(μ ) c. tan-1(μ ) d. tan-1(1/ μ )
  37. 37. 35 Problem A plane glass slab is placed over letters of different colours which letters appears to be raised most : a. Red b. Violet c. Yellow d. All coloured letters appear equally raised
  38. 38. 36 Problem When an ideal gas is heated at constant pressure, the fraction of the heat energy supplied, which increases the internal energy of the gas, is : 2 a. 5 3 b. 5 3 c. 7 5 d. 7
  39. 39. 37 Problem The second law of thermodynamics is concerned with the : a. Conservation of energy b. Conservation of number of holes c. Transformation of heat energy into work d. Conservation of temperature
  40. 40. 38 Problem At which of the following temperature would the molecules of a gas have twice, the average kinetic energy they have at 200C ? a. 3130C b. 3730C c. 3930C d. 5860C
  41. 41. 39 Problem An iron piece falls from a height of 1 km on the ground. If all the energy is converted into heat, the temperature of the iron piece will be (specific heat of iron = 0.1kcal/kg 0C) : a. 0.2330C b. 2.330C c. 32.80C d. 2330C
  42. 42. 40 Problem If a given mass of gas occupies a volume 100m3 at one atmospheric pressure and temperature of 1000C, What will be its volume at 4 atmospheric pressure the temperature being the same : a. 25 cm3 b. 0 c. 50 cm3 d. 5 cm3
  43. 43. 41 Problem Work done by a system is zero in : a. Isothermal process b. Adiabatic process c. Isochoric process d. Isobaric process
  44. 44. 42 Problem 1 mole of a monoatomic gas is first heated at constant volume at 1000C. The change in internal energy of the gas is u1. Next it  is heated at constant pressure at 1000C, the change in internal energy of the gas is  U2. Then the u1 ratio : u2 a. 1 3 b. 5 5 c. 3 d. uncertain
  45. 45. 43 Problem If the degrees of freedom of a gas are f then the ratio of its specific heats C p is C given by : 2 a. 1+ f b. 1 - 2 f c. 1 + 1 f 1 d. 1- f
  46. 46. 44 Problem In bringing an electron towards another electron, electrostatic potential energy of system : a. Decreases b. Increases c. Remains unchanged d. Becomes zero
  47. 47. 45 Problem Viscosity is most closely related to : a. Friction b. Adhesive molecular force c. Cohesive molecular force d. Bernoullis theorem
  48. 48. 46 Problem The substances which are repelled by a magnet are called : a. Diamagnetic substances b. Paramagnetic substances c. Ferromagnetic substance d. Super magnetic substance
  49. 49. 47 Problem The time constant of L-R circuit is : a. LR L b. R R c. L 1 d. LR
  50. 50. 48 Problem In a full wave rectifier, the rms value of AC component of the waves : a. Equal to DC value b. More than DC value c. Less than DC value d. Zero
  51. 51. 49 Problem The minimum wavelength of X-rays produced by electrons accelerated by a potential difference of V volts is : a. eV vc eV b. hc hc c. eV h d. v
  52. 52. 50 Problem According to Bohr’s theory the relation between principal quantum number n and radius (r) of orbit : a. 1 r  n b. r n c. r  n2 1 d. r  n2
  53. 53. FOR SOLUTIONS VISIT WWW.VASISTA.NET

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