AMU - PHYSICS - 2000

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amu –Past papers:

amu –Past papers PHYSICS- UNSOLVED PAPER - 2000

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 Equivalent resistance between points X and Y is : a. b. c. d. Problem

Problem:

02 Each quarter of a vessel of depth H is filled with liquids of the refractive indices from the bottom respectively. The apparent depth of the vessel when looked normally is : a. b. c. d. Problem

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Problem 03 Wavelength associated with an electron of kinetic energy 54 eV is : 3.5 x 10 -11 m 3.6 x 10 -9 m 1.6 x 10 -10 m 2.29 x 10 -8 m

Problem:

Problem 04 In a transistor the base current is 100 A and emitter current is 5 mA . The value of collector current will be : 4.9 mA 5.9 mA 49 mA none of these

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Problem 05 What is the effective capacitance between X and Y in the given figure is : 2.5 3 4.5 2

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Problem 06 The numerical value of charge on either plate of capacitor C shown in fig. CF

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Problem 07 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 54 watt 36 watt 27 watt 18 watt

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Problem 08 The radioactive decay of uranium into thorium is given by the equation 92 U 238 90 Th 234 + X then X is : An particle A neutron A proton An electron

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Problem 09 92 U 238 decay to 82 Pb 206 . The number of and particles emitted respectively are 8 and 6 3 and 5 2 and 3 1 and 2

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Problem 10 An interference pattern is observed by Young’s 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 : Becomes four times Remains same Become one fourth Becomes double

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Problem 11 An operating power of an amplifier is supplied from : Output of the amplifier Transistor A.C. Signal D.C. supply

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Problem 12 A diode as a rectifier converts : High voltage into low voltage and vice vera Vearying D.C. current into constant d.c . Current D.C into A.C. A.C. into D.C.

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Problem 13 In the given circuit the resonant frequency is : 0.22 cycles/sec 0.22 cycles/sec 22 cycles/sec 220 K cycles/sec

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Problem 14 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 ? Couple on loop S will be the highest Couple on loop R will be the highest Couple on loop Q will be the highest Couple on loop P will be the highest

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Problem 15 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/s 2 ) : 1.25 cm 2.5 cm 5 cm zero

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Problem 16 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.

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Problem 17 The root mean square speed ( rms ) of oxygen molecule O 2 at a certain temperature T (degree absolute) is v. If the temperature is doubled and oxygen gas dissociates into atomic oxygen the rms speed : Becomes Remains Becomes Becomes

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Problem 18 In the circuit shown in figure. If booth the bulbs B 1 and B 2 are indentical : Only B 2 will glow because the capacitor has indefinite impedance B 1 will be brighter than B 2 B 2 will be brighter than B 1 Their brightness will be same

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Problem 19 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 36 0 C. The temperature difference across the layer A is : 24 0 C 18 0 C 8 0 C 12 0 C

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Problem 20 The excess pressure across the surface of a soap bubble of radius r (T is surface tansion of a soap solutions) is : a. b. c. d.

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Problem 21 The resultant of two forces of magnitude 3 N and 4 N may be : Any one between 1 N and 7 N depending on angle between them 5 N 7 N 1 N

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Problem 22 Calculate the value of h in U tube shown in fig. Density of oil = 0.9 g/cm 3 Density of carbon tetra chloride = 1.6 g/cm 3 Density of mercury = 13.6 g/cm 3 18.9cm 20.9cm 16.9cm 14.9cm

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Problem 23 If a volume of a block of a metal changes by 0.12% when it is heated through 20 0 C. The coefficient of linear expansion of metal is : 2.0 x 10 -5 / 0 C 10 x 10 -5 / 0 C 0.5 x 10 -5 / 0 C 3.0 x 10 -5 / 0 C

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Problem 24 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 and B respectively B and A respectively A and C respectively C and D respectively

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Problem 25 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] 2025 J 1792 J 1610 J 1280 J

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Problem 26 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 : X-ray region Infrared region Visible region Ultra violet region

Problem:

Problem 27 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 : 25 Hz 800 Hz 400 Hz 200 Hz

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Problem 28 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 : a. b. c. d.

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Problem 29 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 : a. b. c. d.

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Problem 30 100 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 : 107 J and 150 paise 5 x 10 6 J and 150 paise 5 x 10 6 and 300 paise 10 7 J and 300 paise

Problem:

Problem 31 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 -34 Js) : 11.61 x 10 -33 Å 217105 Å 57 x 10 -3 Å 57 Å

Problem:

Problem 32 A narrow electron beam passes undeviated through an electric field E = 3 x 10 4 volt/m and an overlapping magnetic field B = 2 x 10 -3 Wb /m 2 . The electron motion, electric field, and magnetic field are mutually perpendicular the speed of the electron is : 0.67 x 10 -7 m/s 1.5 x 10 -7 m/s 10.3 x 10 -7 m/s 60 m/s

Problem:

Problem 33 as ferromagnetic material is heated above curie temperature, Which one of the following statement is correct ? ferromagnetic material charges itself into diamagnetic material ferromagnetic domains are not influenced ferromagnetic domains become random ferromagnetic domains are perfectly arranged

Problem:

Problem 34 Total electric flux coming out of a unit positive charge put in air is : a. b. ( ) c. d.

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Problem 35 Deuteron and -particles are put 1 Å apart in air. Magnitude of intensity of electric field due to deuteron at -particle is : 5.76 x 10 11 N/C 1.44 x 10 11 N/C 2.88 x 10 11 N/C zero

Problem:

Problem 36 In the figure an air lens of radii of curvature 10 cm (R 1 = R 2 = 10 cm) is cut in a cylinder of glass ( = 1.5). the focal length and nature of lens is : 15 cm convex zero, concave neither concave nor convex 15 cm concave

Problem:

Problem 37 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 : 24 hr 48 hr 48 hr 4.8 hr

Problem:

Problem 38 Three blocks of masses m 1 , m 2 and m 3 are connected by massless strings as shown on a frictionless table. They are pulled with a force T 3 = 40 N. If m 1 = 10 kg, m 2 = 6kg and m 3 = 4 kg. The tension T 2 will be : 32 N 10 N 40 N 20 N

Problem:

Problem 39 The following four wires are made of same material and same tension is applied on them, which one will have maximum increase in length ? Length = 300 cm, diameter = 3 mm Length = 200 cm, diameter = 2 mm Length = 50 cm, diameter = 0.5 mm Length = 100 cm, diameter = 1 mm

Problem:

Problem 40 In the spectrum of light of a luminous heavenly body the wavelength of a spectral line is measured to be 4747 Å while actual wavelength of line is 4700 Å. The relative velocity of the heavenly body with respect to earth will be (velocity of light = 3 x 10 8 m/s) : 3 x 10 6 m/s moving away from the earth 3 x 10 6 m/s moving towards the earth 3 x 10 5 m/s moving away from the earth 3 x 10 6 m/s moving towards the earth

Problem:

Problem 41 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) : 87.8 N 89.42 N 8.72 N 8.94 N

Problem:

Problem 42 Hot water cools from 60 0 C to 50 0 C in the first ten minutes and to 42 0 C in the next 10 minuts . The temperature of surrounding is : 20 0 C 15 0 C 5 0 C 10 0 C

Problem:

Problem 43 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 10 5 J. The pressure of hydrogen in the cylinder is : 5 x 10 6 N/m 2 4 x 10 5 N/m 2 3 x 10 J m/s 2 x 10 6 N/m 2

Problem:

Problem 44 The average kinetic energy of thermal neutron is of the order of : 3 MeV 3 KeV 3 eV 0.032 eV

Problem:

Problem 45 A lift is desending at a constant speed . A passenger in the lift drops a coin. The acceleration of coin towards with floor is : + g + 2g +g - g

Problem:

Problem 46 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 : 18 F 2 F 3.3 x 10 -10 F 2 x 10 -9 F

Problem:

Problem 47 In any bohrs orbit of the hydrogen atom the ratio of kinetic energy to potential energy of the electron is : - 2 2

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Problem 48 A wheel rotates with constant acceleration of 2.0 rad /s 2 , if the wheel starts from rest the number of revolutions it makes in the first ten seconds will be approximately : 32 24 16 8

Problem:

Problem 49 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 : t 2 t 3/2 t 3/4 t 1/2

Problem:

Problem 50 A bullet is fired with a speed of 1500 m/s in order to hit a target 10 m away. If g = 10 m/s 2 . the gun should be aimed : 15 cm above the target 10 cm above the target 5 cm above the target directly towards the target

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