- 1. AMU PAST PAPERSPHYSICS- UNSOLVED PAPER - 2000
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
iscorrect. Indicate you choice of the correct answer for each part
in your answer-book bywriting the letter (a), (b), (c) or (d)
whichever is appropriate 3. 01 Problem Equivalent resistance
between points X and Y is :13 R a. 2 1 b. 2 R 31 c. 1 R4 1 R d.5 4.
02 Problem Each quarter of a vessel of depth H is filled with
liquids of the refractive indices 1 , 2 , 3 , 4 from the bottom
respectively. The apparent depth of the vessel when looked normally
is : 1 1 1 1 2 3 4 a. H 12(1 2 3 4 ) b. 4HH 1 2 3 4 ) c. 41 11 1 H
d. 1 2 3 4 4 5. 03 Problem Wavelength associated with an electron
of kinetic energy 54 eV is : a. 3.5 x 10-11 m b. 3.6 x 10-9 m c.
1.6 x 10-10 m d. 2.29 x 10-8 m 6. 04 Problem In a transistor the
base current is 100 A and emitter current is 5 mA. The value of
collector current will be : a. 4.9 mA b. 5.9 mA c. 49 mA d. none of
these 7. 05 Problem What is the effective capacitance between X and
Y in the given figure is : a. 2.5 F b. 3 F c. 4.5 F d. 2F 8. 06
Problem The numerical value of charge on either plate of capacitor
C shown in fig.CER1 a. R2 rCER2 b. R2 rCER1 c.R1 r d. CF 9. 07
Problem Three equal resistor are connected as shown in figure. The
maximum power connected by each resistor is 18 watt. Then maximum
power consumed by the combination a. 54 watt b. 36 watt c. 27 watt
d. 18 watt 10. 08 Problem The radioactive decay of uranium into
thorium is given by the equation 92U238234 90Th + X then X is : a.
An particle b. A neutron c. A proton d. An electron 11. 09
Problem238 decay to 82Pb206. The number of and particles emitted
respectively are 92U a. 8 and 6 b. 3 and 5 c. 2 and 3 d. 1 and 2
12. 10 Problem An interference pattern is observed by Youngs double
slit experiment. If now, the separation between coherent sources is
halved and the distance of screen from coherent sources be doubled.
The new fringe width : a. Becomes four times b. Remains same c.
Become one fourth d. Becomes double 13. 11 Problem An operating
power of an amplifier is supplied from : a. Output of the amplifier
b. Transistor c. A.C. Signal d. D.C. supply 14. 12 Problem A diode
as a rectifier converts : a. High voltage into low voltage and vice
vera b. Vearying D.C. current into constant d.c. Current c. D.C
into A.C. d. A.C. into D.C. 15. 13 Problem In the given circuit the
resonant frequency is : a. 0.22 cycles/sec b. 0.22 cycles/sec c. 22
cycles/sec d. 220 K cycles/sec 16. 14 Problem From wires each of
length 2.0 metres are bent into four loops P, Q, R and S, are then
suspended into uniform magnetic field. Same current is passed in
each loop which element has highest couple ? a. Couple on loop S
will be the highest b. Couple on loop R will be the highest c.
Couple on loop Q will be the highest d. Couple on loop P will be
the highest 17. 15 Problem A mass of 10 g moving horizontally with
a velocity of 10 cm/sec strikes a pendulum bob of mass 10 g. The
two masses stick together. The maximum height reached by the system
now is, (g = 10 m/s2) : a. 1.25 cm b. 2.5 cm c. 5 cm d. zero 18. 16
Problem which of the graphs best represents the velocity time graph
of a ball thrown vertically upward to a considerable height and
which then return to the thrower ? a. b. c. d. 19. 17 Problem The
root mean square speed (rms) of oxygen molecule O2 at a certain
temperature T (degree absolute) is v. If the temperature is doubled
and oxygen gas dissociates into atomic oxygen the rms speed : a.
Becomes 2 b. Remains c. Becomes 2 d. Becomes 20. 18 Problem In the
circuit shown in figure. If booth the bulbs B1 and B2 are
indentical : a. Only B2 will glow because the capacitor has
indefinite impedance b. B1 will be brighter than B2 c. B2 will be
brighter than B1 d. Their brightness will be same 21. 19 Problem A
wall has to layers A and B, each made of a different material. Both
layers have the same thinkness. The thermal conductivity of the
material of A is twice that of B. Under thermal equilibrium : The
temperature difference across the will is 360C. The temperature
difference across the layer A is : a. 240C b. 180C c. 80C d. 120C
22. 20 Problem The excess pressure across the surface of a soap
bubble of radius r (T is surface tansion of a soap solutions) is
:4T a. r8T b.r2T c.rT d. 2 23. 21 Problem The resultant of two
forces of magnitude 3 N and 4 N may be : a. Any one between 1 N and
7 N depending on angle between them b. 5 N c. 7 N d. 1 N 24. 22
Problem Calculate the value of h in U tube shown in fig. Density of
oil = 0.9 g/cm3 Density of carbon tetra chloride = 1.6 g/cm3
Density of mercury = 13.6 g/cm3 a. 18.9cm b. 20.9cm c. 16.9cm d.
14.9cm 25. 23 Problem If a volume of a block of a metal changes by
0.12% when it is heated through 200C. The coefficient of linear
expansion of metal is : a. 2.0 x 10-5/0C b. 10 x 10-5/0C c. 0.5 x
10-5/0C d. 3.0 x 10-5/0C 26. 24 Problem Four curves A, B, C and D
are drown in the fig. For a given amount of gas. The curves which
represent adiabatic and isothermal and isothermal changes are : a.
A and B respectively b. B and A respectively c. A and C
respectively d. C and D respectively 27. 25 Problem At NTP one mole
of diatomic gas is compared adibatically to half of its volume =
1.40. The work done on the gas will be [(2)0.4 = 1.32] a. 2025 J b.
1792 J c. 1610 J d. 1280 J 28. 26 Problem In atom bomb, a
temperature of abdout 10 million degree is developed at the moment
of explosion. In what region of the spectrum do the wavelength
corresponding maximum energy density lie verse if the light source
is in atom bomb : a. X-ray region b. Infrared region c. Visible
region d. Ultra violet region 29. 27 Problem The fundamental
frequency of transverse vibration of a string is 200 Hz. If the
string is made to vibrate in two loops and the tension is increased
to 4 times, the new frequency becomes/remains : a. 25 Hz b. 800 Hz
c. 400 Hz d. 200 Hz 30. 28 Problem A observer approaching a
stationary source with a velocity one third the velocity of sound.
Then the ratio of apparent frequency and actual frequency of source
will be :2 a. 33 b. 23 c. 44 d. 3 31. 29 Problem A long wire having
a semicircular loop of radius r carries a current i as shown in
fig. The magnetic induction at the centre O due to entire wire :0 i
a.6 r b. 30 i 20 i c.2 r 0iB d.4 r 32. 30 Problem 100 capacitors
each having a capacity of 10 F are connected in parallel and are
charged by a potential difference of 100 kV. The energy stored in
the capacitor and the cost of charging them. If electrical energy
costs 108 paisa per kWh, will be : a. 107 J and 150 paise b. 5 x
106 J and 150 paise c. 5 x 106 and 300 paise d. 107 J and 300 paise
33. 31 Problem A p type semiconductor has acceptor levels 57 meV
above the balance band. The maximum wavelength of light required to
create holes is (Planck constant h = 6.6 x 10-34Js) : a. 11.61 x
10-33 b. 217105 c. 57 x 10-3 d. 57 34. 32 Problem A narrow electron
beam passes undeviated through an electric field E = 3 x 104 volt/m
and an overlapping magnetic field B = 2 x 10-3 Wb/m2. The electron
motion, electric field, and magnetic field are mutually
perpendicular the speed of the electron is : a. 0.67 x 10-7 m/s b.
1.5 x 10-7 m/s c. 10.3 x 10-7 m/s d. 60 m/s 35. 33 Problem as
ferromagnetic material is heated above curie temperature, Which one
of the following statement is correct ? a. ferromagnetic material
charges itself into diamagnetic material b. ferromagnetic domains
are not influenced c. ferromagnetic domains become random d.
ferromagnetic domains are perfectly arranged 36. 34 Problem Total
electric flux coming out of a unit positive charge put in air is :
a. 4 0 b. ( 4 )0 c.01 d. 0 37. 35 Problem Deuteron and -particles
are put 1 apart in air. Magnitude of intensity of electric field
due to deuteron at -particle is : a. 5.76 x 1011 N/C b. 1.44 x 1011
N/C c. 2.88 x 1011 N/C d. zero 38. 36 Problem In the figure an air
lens of radii of curvature 10 cm (R1 = R2 = 10 cm) is cut in a
cylinder of glass ( = 1.5). the focal length and nature of lens is
: a. 15 cm convex b. zero, concave c. neither concave nor convex d.
15 cm concave 39. 37 Problem A geostationary satellite is taken
from its orbit to another orbit. If the distance of the second
orbit from the centre of the earth is double that of the first
orbit. Then its time period in the second orbit will be : a. 24 hr
b. 48 hr c. 48 2 hr d. 4.8 hr 40. 38 Problem Three blocks of masses
m1, m2 and m3 are connected by massless strings as shown on a
frictionless table. They are pulled with a force T3 = 40 N. If m1 =
10 kg, m2 = 6kg and m3 = 4 kg. The tension T2 will be : a. 32 N b.
10 N c. 40 N d. 20 N 41. 39 Problem The following four wires are
made of same material and same tension is applied on them, which
one will have maximum increase in length ? a. Length = 300 cm,
diameter = 3 mm b. Length = 200 cm, diameter = 2 mm c. Length = 50
cm, diameter = 0.5 mm d. Length = 100 cm, diameter = 1 mm 42. 40
Problem In the spectrum of light of a luminous heavenly body the
wavelength of a spectral line is measured to be 4747 while actual
wavelength of line is 4700 . The relative velocity of the heavenly
body with respect to earth will be (velocity of light = 3 x 108
m/s) : a. 3 x 106 m/s moving away from the earth b. 3 x 106 m/s
moving towards the earth c. 3 x 105 m/s moving away from the earth
d. 3 x 106 m/s moving towards the earth 43. 41 Problem A mass of
100 g is tied to one end of a string 2 metres long. The body is
revolving in a horizontal circle making a maximum of 200
revolutions per minute. The other end of the string is fixed at the
centre of the circle of revolutions. The maximum tension that the
string can bear is (approximately) : a. 87.8 N b. 89.42 N c. 8.72 N
d. 8.94 N 44. 42 Problem Hot water cools from 600C to 500C in the
first ten minutes and to 420C in the next 10 minuts. The
temperature of surrounding is : a. 200C b. 150C c. 50C d. 100C 45.
43 Problem A cylinder of capacity 20 litres is filled with hydrogen
gas. The total average kinetic energy gas. The total average
kinetic energy of translating motions of its molecule is 1.52 x 105
J. The pressure of hydrogen in the cylinder is : a. 5 x 106 N/m2 b.
4 x 105 N/m2 c. 3 x 10 J m/s d. 2 x 106 N/m2 46. 44 Problem The
average kinetic energy of thermal neutron is of the order of : a. 3
MeV b. 3 KeV c. 3 eV d. 0.032 eV 47. 45 Problem A lift is desending
at a constant speed . A passenger in the lift drops a coin. The
acceleration of coin towards with floor is : a. + g b. + 2g c. +g
d. - g 48. 46 Problem The radii of two sphere forming a spherical
condenser are 0.5 and 0.6 m. Its medium having dielectric constant
6 is completely filled in between, the spherical condenser the
capacity of the condenser will be : a. 18 F b. 2 F c. 3.3 x 10-10 F
d. 2 x 10-9 F 49. 47 Problem In any bohrs orbit of the hydrogen
atom the ratio of kinetic energy to potential energy of the
electron is : a. - 21 b. 2 c. 21 d. 2 50. 48 Problem A wheel
rotates with constant acceleration of 2.0 rad/s2, if the wheel
starts from rest the number of revolutions it makes in the first
ten seconds will be approximately : a. 32 b. 24 c. 16 d. 8 51. 49
Problem A body is moved from rest along a straight line by a
matchine delivering constant power. the distance moved by the body
in time t is proportional to : a. t2 b. t3/2 c. t3/4 d. t1/2 52. 50
Problem A bullet is fired with a speed of 1500 m/s in order to hit
a target 10 m away. If g = 10 m/s2. the gun should be aimed : a. 15
cm above the target b. 10 cm above the target c. 5 cm above the
target d. directly towards the target 53. FOR SOLUTIONS VISIT
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