AMU - PHYSICS - 1997

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amu –Past papers:

amu –Past papers PHYSICS- UNSOLVED PAPER - 1997

SECTION – I:

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

Problem:

01 A small telescope has an objective lens of focal length 150 cm and an eye piece of focal length 5 cm.The magnifying power of the telescope for viewing distant objects when the final image is formed at the least distance of distinct vision. 60 45 30 36 Problem

Problem:

02 Two thin lenses of same material and focal length f 1 and f 2 from an achromatic combination when the lenses are placed coaxially at a distance d apart so that : d = d = d = f 1 – f 2 ­ d 1 = Problem

Problem:

Problem 03 A beam of light of wavelength 600nm from distant source falls on a single slit 1.0 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringe on either side of the central bright fringe is 2.4 mm 2.4 cm 1.2 cm 1.2 mm

Problem:

Problem 04 In an interference pattern produced by the identical coherent sources of monochromatic light, the intensity at the site of central maxima is I. The intensity at the same sot when either of the two slits is closed is I 0 then we must have I and I 0 are not related I=4I 0 I=I 0 I=2I 0

Problem:

Problem 05 The temperature above which a ferromagnetic material becomes paramagnetic is called : Inversion temperature Debye temperature Critical temperature Curie temperature

Problem:

Problem 06 Surface temperature of sun is estimated by measuring the wavelength at which the intensity of its emitted radiation is maximum and using : Wiens displacement law Stefan’s law Planck law Intensity y on Fraunhoffers lines

Problem:

Problem 07 If unit of length, mass and time each be doubled the unit of work is increased by : 8 times 4 times 6 times 2 times

Problem:

Problem 08 An elevator in which a man is standing is moving upwards with a speed of 190m/s. If the man drops a ball from a height of 2.45 m. It reaches the floor of the elevator after a time : sec sec 2 sec

Problem:

Problem 09 The time taken by the radio waves, to go and come back from a communication salellite to the earth is nearly 1 sec sec sec sec

Problem:

Problem 10 What should be the angular speed of earth, so that bodies lying on equator may appear weightless? (take g=10 m/s 2 , and radius of earth R=6400 km) 1.25 x 10 -3 rad /sec 0.62 x 10 -3 rad / ssec 2.5 x 10 -3 rad /sec none of these

Problem:

Problem 11 A particle moves from post ions to position in meter and a uniform force N acts on it. The work done by the force will be : 150 J 50 J 80 J 100 J

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Problem 12 A body of mass 2 kg is given a velocity of 10 m/s on a rough horizontal surface. If coefficient of friction is 0.2 and g=10 m/s 2 . The body will stop after covering the distance of : 250 m 50 m 25 m 10 m

Problem:

Problem 13 If the earth suddenly contracts to half its radius, what should be the length of the day ? by how much would the duration of the day be decreased? 6 hr, 18 hr 4 hr,20 hr 8 hr, 16 hr None of these

Problem:

Problem 14 A rifle bullet losses 1/2oth of its velocity in passing through a plank, the least number of such planks required just to stop the bullet is : 22 11 10 5

Problem:

Problem 15 Which one of the graphs shows variation of magnetic induction with distance r from a long wire carrying current? a. b. c. d.

Problem:

Problem 16 Two wire loops PORSP by joining two semicircular wires of radii R­ 1 and R 2 carrying current I as shown in figure. The magnitude of magnetic induction at centre is : a. b. c. d.

Problem:

Problem 17 The number of electrons tube put on a spherical conductor of radius 0.1 m to produce an electric field of 0.036 N/C just above its surface is : 2.5 x 10 5 2.8 x 10 5 3 x 10 5 3.2 x 10 5

Problem:

Problem 18 A steady current of 5 amp is maintained for 45 minutes. During this time it deposits 4.572 g of zinc at the cathode of a voltammeter ECE of zinc is : 3.394 x 10 -3 g coulomb 3.894 x 10 -3 g coulomb 3.387 x 10 -3 g coulomb None of these

Problem:

Problem 19 A galvanometer of resistance 25 gives full scale deflection for current of 10 mA is to be changed into a voltmeter of range 100 V by connecting a resistance of R in series with galvanometer. The value of resistance is : 9975 8975 10020 10000

Problem:

Problem 20 If the number of turns in a coil becomes doubled then its self inductances will be: Unchanged Four times Halved Doubled

Problem:

Problem 21 A current i is flowing in rectangular loop. It is put close in wire (long and straight) such that wire is parallel to one of the arms of loop and lies in the plane of loop. If a steady current I flows in the wire, the loop: Will remain steady Will move towards the wire Will move a away from the wire Will rotate about an axis parallel to wire

Problem:

Problem 22 The numbers of turns of primary and secondary coils of transformer are 5 and 10 respectively and the mutual inductance of the transformer is 25 H. now the numbers of turns in the primary and secondary of the transformer are made 10 and 5 respectively. The mutual inductance of the transformer will be: 50henry 25henry 12.5henry 6.25henry

Problem:

Problem 23 A wire of length L meter carrying a current I ampere is bent in the form of a circle. Its magnitude of magnetic moment will be: a. b. c. d.

Problem:

Problem 24 A proton and an - particle are accelerated through the same potential difference the ratio of their de Broglie wavelengths will be: 2 1

Problem:

Problem 25 Ultra violet light wavelength 3.00 nm and intensity 1.0 W/m 2 falls on the surface of or photoelectric material. If one percent of incident photons produce photoelectrons. Then the number of photoelectron emitted from an area of 1.0 cm 2 of the surface is nearly: 2.13 x 10 11 /sec 1.52 x 10 12 /sec 3.02 x 10 12 /sec None of these

Problem:

Problem 26 An -particle of 10 MeV colloids head on with copper nucleus (Z=29) and is deflected back. What s the maximum limit of radius of copper nucleus is ? 10.4x10 -15 m 6.4x10 -15 m 4.2x10 -15 m 8.4x10 -15 m

Problem:

Problem 27 The ratio of energy of orbital electron in fourth and fifth orbit of hydrogen atom will be: 16:25 4:5 25:16 5:4

Problem:

Problem 28 A freshly prepared radioactive source of half life 2 hours emits radiation of intensity of which is 64 times the permissible safe level. The minimum time after which would be possible to work safely with this source is: 4 hrs 24 hrs 6 hrs 12 hrs

Problem:

Problem 29 When a slow neutron is captured by a U 235 nucleus. A fission result which releases 200 MeV energy. If the output of a nuclear reactor is 1.6 MW. The rate of nuclei undergoing fission, will be: 5x10 16 3x10 66 4x10 16 None these

Problem:

Problem 30 The dominant mechanism for motion of charge carries n forward and reverse biased silicon p-n junction is: Drift in both forward and reverse biased Diffusion in both forward and reverse biased Diffusion in forward biased and drift in reverse biased Drift in forward biased and diffusion in reverse biased

Problem:

Problem 31 A radio waves of frequency 840 Hz is sent towards aeroplane . The frequency of 2.8 kHz more than the original frequency then velocity of aeroplane is : 0.5 km/sec 5 km/sec 0.25 km/sec None these

Problem:

Problem 32 A transistor with = 0.95 is operated as an amplifier in a common base circuit with a load resistance of 5kW . If the dynamic resistance of the emitter base junction is 70 . The voltage gain and power gain of the circuit will be: 70,68.6 72,70.6 74,72.2 None these

Problem:

Problem 33 A ideal gas expands according to the law PV 2 =constant. The value of molar heat capacity: Cv – R R- C v None of these

Problem:

Problem 34 Water falls through a height of 250 m. Assuming that whole of energy is converted into heat the rise in temperature of water will be: (g = 9.8 m/s 2 , J = 4.18 x10 3 J/ kilocal ) 0.59 0 C 1.59 0 C 2.57 0 C None of these

Problem:

Problem 35 An electric bulbs of volume 25 cm 3 was sealed off during manufacture at a pressure of 10 -3 mm of Hg at 27 0 C. The number of molecules in the bulb will be : 4x10 5 6x10 5 7.05x10 5 8.05x10 5

Problem:

Problem 36 The time period of a seconds pendulum is 2 sec .The spherical bob which is empty from inside has a mass 50 gram this now replaced by another solid of same radius but have different mass of 100 gram. The new time period will be: 2 sec 8 sec 4 sec 1 sec

Problem:

Problem 37 Van de Graffe generator is used to: Compare high D.C. potential Produce high A.C. potential Measure high potential difference Produce high D.C. potential

Problem:

Problem 38 The force between the plate of a charged parallel plate capacitor is: none of these

Problem:

Problem 39 A colour coded carbon resistor has the scheme (as shown in fig), then the colour coded resistance will be : 52000 10% 53000 10% 62000 10% none of these

Problem:

Problem 40 A particle is particle is executing S.H.M., the potential energy of the particle is maximum at: Same at all position Midway between mean and extreme position Mean position Extreme position

Problem:

Problem 41 Two perfect gases at absolute temperature T 1 and T 2 are mixed, there is so loss of energy then the temperature of the mixture if masses are m 1 and m 2 and the number of molecules are n 1 and n 2 respectively will be: a. b. c. d.

Problem:

Problem 42 At 27 o C temperature, then mean kinetic energy per molecule of an ideal gas is E 1 . If the temperature is increased to 327 0 C the mean kinetic energy would be ; a. b. E c. d. 2 E

Problem:

Problem 43 The bulk modulus of water is 2x10 9 N/m 2 the change in pressure required to increases the density of water by 0.1% is: 2x10 4 N/m 2 2x10 6 N/m 2 2x10 8 N/m 2 2x10 9 N/m 2

Problem:

Problem 44 In a sinusoidal wave, the time required for a particle point to move from maximum displacement is 0.17 sec. The frequency of wave is: 2.94 Hz 1.97 Hz 0.73 Hz 0.36 Hz

Problem:

Problem 45 The mass f moon is of the earth’s mass and its radius is that of earth . If the escape velocity from the earth’s surface is 11.2 km/sec. The value of escape velocity on the moon will be: 5 km/s 2.5 km/s 7.5 km/s 2.1 km/s

Problem:

Problem 46 The strong, electrostatic and gravitation forces are in the ratio: 1:10 -8 :10 -48 1:10 4 :10 40 1:10 -3 :10 -30 1:10 -2 :10 -34

Problem:

Problem 47 The gravitational force is given by The work done in transporting a mass of 2 kg from (0,0,0) to (4,3,5) m by a external source is : 15 J 10 J 50 J 20 J

Problem:

Problem 48 A hammer weighing 2.5 kg moving with a speed of 1 m/s strikes the head of the nail driving it 10 cm into the wall. The acceleration during impact and the impulse imparted to wall will be respectively: -5m/s 2 , 2.5Ns -10m/s 2 , 5 Ns -7.5 m/s 2 , 3.5 Ns None of these

Problem:

Problem 49 A projectile can have the same range for two angles of projection. If h 1 and h 2 are maximum heights when the range in the two cases is R, then the relation between R, h 1 and h 2 is : R = 4 R = 2 R = None of these

Problem:

Problem 50 When the kinetic energy of a body is increased by three times, then the momentum increases: 6 times 1.732 times 2 times 3 times

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