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AFMC–Past papers PHYSICS- UNSOLVED PAPER - 1996
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SECTION – A 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
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Problem 01 A ball is dropped from 10m. it is embedded in sand by 15 mm and then stops, which of the following is conserved? Temperature Momentum Kinetic energy Both (a) and (c)
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Problem 02 If we consider electrons and photons of the same wavelength, then they will have same Momentum Energy Angular momentum Velocity
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Problem 03 Equation for the change of state was given by Newton Clausius Clausius-clapeyron Joules
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Problem 04 If n small balls, each of mass m impinge elastically each second on a surface with a velocity u, then the force experienced by the surface in one second will be 0.5 mnu 1 mnu 2 mnu 4mnu
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Problem 05 Velocity of light is maximum in Glass Diamond Vacuum water
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Problem 06 The equation of sound wave is Y=0.0015 sin(62.4x+316t) the wavelength of this wave is 0.2 unit 0.1 unit 0.3 unit 0.4 unit
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Problem 07 In an adiabatic expansion of a gas Temperature is kept constant Heat is gained or lost Volume is kept constant Heat is neither gained nor lost
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Problem 08 The dew point and atmospheric temperature on a particular day is found to be 180 c and 250c. if saturation vapour pressure at 180c 250c be 15.5 mm and 25.7 mm of Hg, its relative humidity is 90% 30.0% Not possible to calculate 60.3%
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Problem 09 The surface tension of a liquid is 108 dyne/cm2. It is equivalent to 105 N/m 107 N/m 104 N/m 106 N/m
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Problem 10 When the key K is pressed at time t = 0, then which of the following statement about the current I in the resistor AB of the given circuit is true? I oscillates between 1 mA and 2mA I = 1 mA at all t At t=0, I=2mA and with time it goes to 1mA I = 2mA and at all t
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Problem 11 Davy’s safety lamp is based on Convection Radiation Polarization Conduction
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Problem 12 R.M.S velocity of a particle is v at pressure P. If the pressure increases by two times, then R.M.S velocity will become 2 v 0.5 v 4 v v
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Problem 13 light waves are transverse, because they are polarized reflect are not polarized refract
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Problem 14 In a hydrogen discharge tube, it is observed that through a given cross-section 3.13 x 1015 electrons are moving from right to left and 3.12*1015 protons are moving from left to right. What is the electric current in the discharge tube and what is its direction? 2 mA towards right 1 mA towards right 2 mA towards left 1 mA towards left
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Problem 15 When current flows in a conductor, then the ratio of the intensity of electric field E at any point within the conductor and the current density at a point is called Specific resistance Resistance Inductance Conductance
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Problem 16 A man is standing on a spring platform. Reading of spring balance is 60 kg wt. if man jumps outside from the platform, then reading of spring balance. Decrease to zero Increase Remain same First (b) then (a)
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Problem 17 A thermo flask is polished well To absorb all radiation from outside To make attractive To reflect all radiation from outside For shining
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Problem 18 What percent of original radioactive atoms is left after five half-lives? 5% 20% 3% 10%
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Problem 19 If the coefficient of friction of a plane inclined at 300 is 0.4 then acceleration of a body sliding freely on it is (g = 9.8m/s2) 4.9 m/s2 9.8 m/s2 2.54 m/s2 1.51 m/s2
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Problem 20 If current flowing in a conductor changes by 1%, then power will change by 10% 1% 100% 2%
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Problem 21 Coefficient of performance of an ideal refrigerator working between temperatures T1 and T2 (T1>T2) is a. b. c. d.
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Problem 22 If an electron jumps from 1st orbit to 3rd orbit, then No gain of energy Absorb energy No loss of energy Release energy
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Problem 23 The unit of R in the general gas equation is a. b. c. d.
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Problem 24 in a coil of self-inductance % henry, the rate of change of current is 2 ampere per second e.m.f induced in the coil is 10 V -10 V 5 V -5 V
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Problem 25 Myopia is due to Shortening of eye ball Older age Elongation of eye ball Change in focal length
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Problem 26 If the new velocity of a body is twice its previous velocity, then kinetic energy will become 4 times 2 times 6 times 0.5 times
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Problem 27 The laplace correction was necessary to newton’s calculation of velocity of sound, because travel of sound in a medium is Isobaric process Isothermal process Isochoric process Adiabatic process
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Problem 28 An electric lamp is connected to 220 V, 50Hz supply. The peak voltage is 311 V 210 V 320 V 211 V
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Problem 29 The discoverer of loudness and intensity of sound is Laplace Newton Edison Bell
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Problem 31 Which of the following is not a unit of time? Micro-second Hour Light year Niño-second
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Problem 32 The time period of a simple pendulum in a satellite is Zero Unity Same as an earth Infinity
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Problem 32 Which of the following is the smallest unit? Fermi Millimeter Metre Angstrom
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Problem 33 The phenomenon of production of e.m.f in a current carrying metallic strip on applying a magnetic field along a direction perpendicular to the direction of flow of current is known as Seeback effect Hall effect Peltier effect Joule effect
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Problem 34 Resonance is a special case of Damped vibration Forced vibration Un-damed vibration Natural vibration
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Problem 35 If magnetic material, which moves from stronger to weaker parts of a magnetic field, then it is known as Diamagnetic Paramagnetic Ferromagnetic Anti-ferromagnetic
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Problem 36 What is the magnitude of magnetic force per unit length of a wire carrying a current of 5 A and making an angle of 300 with direction of a uniform magnetic field of 0.1 T? 0.25 N-m 0.35 N-m 0.45 N-m 0.55 N-m
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Problem 37 Lightning was discovered by Ohm Faraday Thomson Franklin
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Problem 38 A string attached with a bob of mass m oscillates from A to C and back to A such that PB is H. if the acceleration due to gravity is g, then the velocity of the bob as it passes through B is mgH Zero √2gH 2gH
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Problem 39 Thermal conductivity depends on Difference in temperature Nature of material Atmospheric temperature Heat produced
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Problem 40 Half-life of radioactive material depends on Material’s amount Temperature Disintegration medium Nature of material
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Problem 41 The evaporation of a liquid from its surface is based on Thomson’s law Joule’s law Bernoulli’s law Stefan’s law
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Problem 42 In an equilateral triangular prism, the angle of minimum deviation for a certain wavelength is 400. The corresponding angle of incidence is 300 400 450 500
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Problem 43 If vector A and B has angle Ѳ between them, then vector product is AB AB cosѲ A x B xcos Ѳ AB sin Ѳ
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Problem 44 Which of the following cannot be resultant of 5 and 10? 5 8 2 7
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Problem 45 What is the mass of a silver atom? (Avogadro’s no.=6.022*1023 mol-1 and atomic mass of silver = 108) 120.12 x 10-31 kg 17.93 x -26 kg 17.93 x 10-33 kg 16.81 x 10-29 kg
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Problem 46 92U235 and 92U238 differ as 92U238 has 3 neutrons more 92U235 has 2 protons less 92U235 has 3 protons less None of these
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Problem 47 A rocket is based on ht principle of Conservation of linear momentum Conservation of angular momentum Both (a) and ( b) None of these
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Problem 48 The radius of gyration of a disc of mass 50g and radius 2.5 cm about an axis passing through its centre of gravity and perpendicular to the plane is 0.52 cm 1.76 cm 3.54 cm 6.54 cm
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Problem 49 The minimum number of non-collinear vectors required to produce a zero vector is 2 1 4 3
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Problem 50 The dimension of angular velocity is [M0L0T-1] [M0LT-2] [ML1T-1] [M0LT-1]