AMU - PHYSICS - 2001

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amu –Past papers:

amu –Past papers PHYSICS- UNSOLVED PAPER -2001

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 In a Young’s double slit experiment, the separation on the two slits is doubled. The keep the same spacing of fringes, the distance D of the screen from the screen from the slits would be made : 2D D Problem

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02 The Hubble constant has the dimension of : Time (time) -1 length mass Problem

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Problem 03 The radius of a nucleus of mass number A is directly proportional to : A 1/3 A 2/3 A 3 A 3/2

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Problem 04 A 60 kg man runs up a stair case in 12 second while a 50 kg man runs up the same stair case in 11 seconds. The ratio of the rate of doing their work will be : 10 : 11 11 : 10 6 : 5 5 : 6

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Problem 05 Two SHW are represented by the equation their amplitude ratio, and phase difference are respectively : 1 : 1, 2 : 3, 3 : 4, 2 : 1,

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Problem 06 Where A is the area of cross-section of spring and L is the length of the spring and E is the Young’s modulus of the material of the spring then time period and force constant of the spring will be respectively : a. b. c. d.

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Problem 07 then angle between vectors is : 180 0 90 0 45 0 0 0

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Problem 08 The deceleration experienced by a moving motor boat, after its engine is cut off is given where k is constant and is the magnitude of the velocity at time t after the cut off is : a. b. c. d.

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Problem 09 The time displacement curves of two objects A and B are shown in the adjoining figure then : The graph does not give information Both A and B have same velocity The velocity of A is greater than B The velocity of A is less than B

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Problem 10 The vectors are perpendicular to each other. The positive value of ‘a’ is ; 13 9 4 3

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Problem 11 Consider the following statements : ( i ) For a permanent magnet the area of a hysteresis loop can be allowed to be large (ii) Coercivity of the material in permanent magnets should be small ( i ) but not (ii) (ii) but not ( i ) both ( i ) and (ii) neither ( i ) or (ii)

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Problem 12 When pure germanium is doped with pentavalent impurity like phosphorus the conduction is due to : Position Protons Holes Electrons

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Problem 13 Two capacitors of 10 F and 20 F are connected in series with a 30V battery. ?The charge on the capacitors will be respectively : 100 C, 100 C 200 C, 100 C 200 C, 200 C 100 C, 200 C

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Problem 14 Intrinsic semiconductor is electrically neutral, extrinsic semiconductor having large number of current carriers would be : Electrically neutral Positively charged or negatively charged depending upon the type of impurity that has been added The positively charged Negatively charged

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Problem 15 The amount of a radio active material th of its initial value in 28 days. Its mean life is approximately : 3.5 days 10 days 5 days 7 days

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Problem 16 An observer sees two particles A and B approaching each other from opposite direction, each with a speed 0.8 C. The speed of particle B relative to A will be : 0.975 C 0.875 C 9.75 C 97.5 C

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Problem 17 What is the energy equivalence to 1 g of coal ? 9 x 10 10 J 8 x 10 11 J 9 x 10 12 J 9 x 10 13 J

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Problem 18 A proton and an -particle are accelerated through the same kinetic energy. The ratio of their de Broglie wavelength is : 4 : 1 2 : 1 1 : 1 : 1

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Problem 19 The capacitance of spherical conductor is given by : C = C = 2 C = C =

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Problem 20 In an A.C. circuit the potential difference and current are represented respectively by V = 100 sin (100t) volt i = 100 sin milliamperes. The power in the circuit is : 2.5 watt 5 watt 10 watt 10 4 watt

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Problem 21 Light of frequency 1.5 times the threshold frequency is incident on photo sensitive material. If the frequency is halved and intensity is doubled. The photoelectron becomes : Halved Quadrupled Zero Doubled

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Problem 22 An electron moving with velocity 2 x 10 7 m/s describes a circle in a magnetic field of strength 2 x 10 -2 tesla . If e/m of electron is 1.76 x 10 11 C/kg. Then the diameter of the circle will be : 11 cm 1.1 cm 1.1 mm 1.1m

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Problem 23 The range of wavelength of the visible part of the electro magnetic spectrum is : 8500 – 10000 Å 7000 – 8500 Å 3000 – 4000 Å 4000 – 7000 Å

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Problem 24 A TV transmitting tower has height of 160 m. Its covering range, and the height raised to double its covering range, will be respectively : 45 km, 640 m 50 km, 700 m 40 km, 600 m none of these

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Problem 25 The stopping potential V 0 virsus frequency plot of a substance is shown in fig. The thresold wavelength is : Cannot be estimated from given data 5 x 10 14 cm 500 Å 6000 Å

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Problem 26 In an A.C. circuit resistance R, inductance L and capacitance C are in parallel. The value of R is 50 , inductive reactance X L = 40 and capacitive reactance X C = 25 . Then the reading of ammeter will be: 10.2 A 5 A 17 A 7 A

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Problem 27 A conducting circlar loop is placed in a uniform magnetic field of 0.02 tesla with its palne perpendicular to the magnetic field. If the radius of the loop starts striking at a constant rate of 1 mm/s. Then the emf induced in the loop at the instant when the radius is a 4 cm will be : 8 V 5.0 V 2.0 V 2.5 V

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Problem 28 Two inductors 0.4 H and 0.6 H are connected in parallel. If this combination is connected in series with an inductor of inductance 0.76 H. The equivalent inductance of the circuit will be : 0.1 H 0.2 H 1 H 2 H

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Problem 29 The relation of magnetic force between two short magnets when they are coaxial will be : a. b. c. d.

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Problem 30 the magnetic field at P on the axis of a solenoid having 100 turns / metre and carrying a current of 5 A is : 250 500 500 250

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Problem 31 A cylindrical container is filled with water upto top. It is a square hole of side L at a depth y from the top. Also there is a circular hole of radius R = L at a depth 2y from the top. Then the ratio of quantities of liquid flowing out through the two holes : a. b. c. d.

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Problem 32 A boy has 60 kg wt. He wants to swim in a river with the help of a wooden log. If relative density of wood is 0.6. What is the minimum volume of wooden log ? (density of river water is 1000 kg/m 3 ) 0.66 m 3 150 m 3 m 3 m 3

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Problem 33 Four particles have speed 1 m/s, 2 m/s, 3 m/s and 4 m/s. The root mean square velocity of the molecule is : 2.74 m/s 2 m/s 1.37 m/s 5.48 m/s

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Problem 34 In an isobaric process of an ideal gas. The ratio of heat supplied and work done by the system is : 1

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Problem 35 The disc of siren has n holes and the frequency of its rotation is 300 rpm. It produces a note of wavelength 2.4 m. When the velocity of sound in air is 360 m/s. The value of n is : 24 36 5 30

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Problem 36 the minimum distance of a sounding body form the hill for heating echo clearly is : (speed of sound = 34 m/s) 270 m 8.5 m 34 m 17 m

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Problem 37 A lens of camera has an aperture of 5 cm and focal length 14 cm . What is the f number of camera ? 19 2.8 70

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Problem 38 An automobile of mass m is crossing over a concave over bridge with speed . If radius of bridge is R. The thrust on the bridge at the lowest point will be : Mg + mg - Mg

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Problem 39 From a water fall, water is falling down at the rate of 500 kg/s on the plates of a turbine. If the height of the fall is 50 m, then the power delivered to the turbine is nearly equal to : 2.5 kW 250 kW 10 kW 25 kW

Problem:

Problem 40 A aeroplane is flying in a horizontal direction with a velocity u and at a height of 2000 m. When it is vertically below a point a on the ground at point B. If AB = 3 km and g = 10 m/s 2 . The value of u is : 300 km/hr 150 km/hr 540 km/hr 54 km/hr

Problem:

Problem 41 A boat full of iron scrap is floating on water in lake. If all the iron is dropped into water, the water level of water : Go up Remain the same Rise very high Go very

Problem:

Problem 42 The terminal potential difference of cell when short circuited, is : E zero

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Problem 43 A charged particle moving in a magnetic field is increased in its velocity, then its radius of the circle : Decreases Increases Remain same Becomes half

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Problem 44 An electron revolves 6 x 10 15 time per second in a circular orbit. The current in the loop is : 0.96 mA 0.96 A 28.8 A none of these

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Problem 45 The value of Faradays constant is : 9.65 x 10 4 coulomb 9.65 x 10 4 coulomb 6.03 x 10 27 coulomb 1.6 x 10 -19 coulomb

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Problem 46 If the coefficient of linear expansion of a solid is 0.00009, its coefficient of volume expansion is : 0.0009 0.00018 0.00027 0.0003

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Problem 47 Soldering of two metals is possible because of the property of : Viscosity Surface tension Osmosis Cohesion

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Problem 48 When a triode is used as an amplifier the phase difference between the input signal voltage and output is : Zero

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Problem 49 For Balmer series that lies in the visible region, the shortest wavelength corresponds to quantum number : n = 1 n = 2 n = 3 n =

Problem:

Problem 50 A double convex lens ( = 3/2) of focal length 20 cm is totally immersed in water ( = 4/3). Its focal length now will be : 20 cm 80 cm 40 cm 10 cm

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