AFMC Physics -1995

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AFMC–Past papers: 

AFMC–Past papers PHYSICS- UNSOLVED PAPER - 1995

SECTION – A: 

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

Problem: 

01 In figure the potentiometer wire AB has a resistance of 5Ω and length 10 m the balancing length AJ for the e.m.f of 0.4 V is 0.8m 4m 0.4m 1.5m Problem

Problem: 

Problem 02 The primary winding of a transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an AC supply 20 V, 50 Hz. The Secondary will have an output of 2 v , 50 Hz 200V, 50 Hz 2V, 5Hz 200V, 500Hz

Problem: 

Problem 03 The blue color of the sky is due to the phenomenon of Scattering Reflection Dispersion Refraction

Problem: 

Problem 04 The capacity of a parallel plate capacitor increases with the Increase of its area Decrease of its area Increase of its distance None of these

Problem: 

Problem 05 A student has 10 resistors of resistance r. The minimum resistance made by him from the give resistors is r/100 10r r/5 r/10

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Problem 06 Which one of the following gates correspond to the truth table given below NAND XOR NOR OR

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Problem 07 Which of the following quantity is expressed as force per unit area? Volume Work Area Pressure

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Problem 08 The displacement-time graph of a moving particle is shown below. The instantaneous velocity of the particle is negative as the point E F C D

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Problem 09 The equation constant. The unit of a is Dyne/cm 3 Dyne/cm 5 Dyne x cm 2 Dyne x cm 4

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Problem 10 Water falls from a height of 800 m. if whole of its energy changes to heat, what would be the rise in its temperature when it reaches the ground (1 kcal=4200J) 1.86 0 c 1.18 0 c 0 0 c 0.53 0 c

Problem: 

Problem 11 The twinkling of stars is due to the Refractive index of the earth’s atmosphere fluctuates Fact that stars do not emit light continuously Both (a) and (b) None of these

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Problem 12 At sun rise or sunset, the sun looks more red than at mid-day, because of the Effects of refraction Sun is hottest at these times Effects of diffraction Scattering of light

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Problem 13 The volume of atoms to the volume of nit cell is called Coordination number Packing fraction Lattice parameter Packing coefficient

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Problem 14 a body moves due east with velocity 20km/hour and then due north with velocity 15 km/hour. The resultant velocity 20 km/hour 5 km/hour 25 km/hour 15 km/hour

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Problem 15 A dip circle is at right angle to the magnetic meridian. What will be its apparent dip? 60 0 0 0 90 0 30 0

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Problem 16 Six resistors of 3Ω each are connected along the sides of a hexagon and three resistors of 6Ω each are connected along AC, AD and AE as shown in the figure. The equivalent resistance between A and B is equal to 2 Ω 3 Ω 6 Ω 9 Ω

Problem: 

Problem 17 The direction of magnetic field line of bar magnet is Across the bar magnet From south pole to north pole From south pole to north pole inside the magnet and from north pole to south pole outside the magnet From north pole to south pole

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Problem 18 When Ge crystals are doped with phosphorus atom, then it becomes n-type semiconductor insulator superconductor p-type semiconductor

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Problem 19 In which radioactive disintegration, neutron dissociates into proton and electron? λ - emission He ++ emission Positron emission Β-emission

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Problem 20 The focal length of convex lens is 30cm and the distance of image is quarter of the object, then the object distance is 40cm 90cm 30cm 60cm

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Problem 21 When the number of turns and length of a solenoid are doubled, keeping the area of cross-section same, the inductance Is doubled Is halved Becomes four times Remains the same

Problem: 

Problem 22 A solenoid is at potential difference of 60V. if the current flowing through it is 15 ampere, then resistance of the coil will be 0.25 Ω 4 Ω 2 Ω 8 Ω

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Problem 23 Bending of light about the corner of an obstacle sharp edged is called Polarization Deviation Diffraction Dispersion

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Problem 24 If a source of light is moving away from a stationary observer, then frequency of light wave appears to change because of Diffraction Doppler’s effect Refraction Interference

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Problem 25 The reciprocal of resistance is Voltage Conductance Current Resistivity

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Problem 26 In the case of forward biasing of p-n junction, which one of the following figures correctly depicts the direction of flow of carriers? a. b. c. d.

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Problem 27 A galvanometer is converted into ammeter, when we connect Low resistance in series High resistance in series Low resistance in parallel High resistance in parallel

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Problem 28 In an experiment with Kund’s tube the distance between consecutive nodes is 5 cm when air is inside, and it is 13.4 cm when hydrogen is inside calculate the velocity of sound in hydrogen(speed of sound in air = 330m/s) 424m/s 884.4 m/s 1024.8 m/s 864.4 m/s

Problem: 

Problem 29 The splitting of line into groups under the effect of electric or magnetic field is called Heisenberg's effect Bohr’s effect Magnetic effect Zeeman’s effect

Problem: 

Problem 30 Two open organ pipes of length 25 cm and 25.5 cm produce 0.1 beats/sec. the velocity of sound is 303 m/s 350 m/s 255 m/s 325.5 m/s

Problem: 

Problem 31 On the absolute scale of temperature given by Kelvin, steam point has a value of -273 K 373 K 0 K 273 K

Problem: 

Problem 32 If the radius of curvature of convex mirror is 40 cm and distance of image is twice as that of object, then the object distance is 30 cm 60 cm 20 cm 40 cm

Problem: 

Problem 33 The minimum energy required to remove an electron is called Stopping potential Work function Potential energy Kinetic energy

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Problem 34 Two waves of the same frequency and intensity superimpose with each other in opposite phases after the superposition, the Frequency increases by 4 times Intensity increases by 4 times Intensity increases by two times None of these

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Problem 35 The sensitivity of a tangent galvanometer is increased, if Field is increased Number of turns decreased Field is decreased Number of turns increased

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Problem 36 The resistance of a wire is R. If the length of the wire is doubled, then its resistance will be R 2R 0.25 R 4 R

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Problem 37 Which of the following has a negative temperature coefficient? Man C Ag Fe

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Problem 38 Radiation emitted by a surface is directly proportional to Twice power of its temperature Third power of its temperature Equal to its temperature Fourth power of its temperature

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Problem 39 A rectangle ABCD is such that BC = 2 AB. The moment of inertia along axis will be minimum through HF BC EG BD

Problem: 

Problem 40 In an isothermal expansion, the pressure is determined by Compressibility only Temperature only Both (a) and (b) None of these

Problem: 

Problem 41 Monochromatic light wave means A beam of white colour A beam of the same colour A cluster of beam of different colours None of these

Problem: 

Problem 42 Time period of a simple pendulum will be double, if we Decrease the length 4 times Increase the length 4 times Decrease the length 2 times Increase the length 2 times

Problem: 

Problem 43 Soap bubble appears coloured due to the phenomenon of Dispersion Interference Reflection Diffraction

Problem: 

Problem 44 The translational kinetic energy of gas, for one mole of the gas, is equal to a. b. c. d.

Problem: 

Problem 45 If we move from equator to pole, the value of g Remains the same Increases Decreases First (b) then (c)

Problem: 

Problem 46 If the critical temperature of CO 2 is 31.1 0 C and room temperature is 40 0 C, then CO 2 behaves as Liquid Gas Gas and vapour Vapour

Problem: 

Problem 47 The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to 1/ √V √V 1/V V 2

Problem: 

Problem 48 A bullet of mass 0.1 kg is fired with a speed of 100m/sec, the mass of gun is 50 kg. The velocity of recoil is 0.5 m/sec 0.2 m/sec 0.05 m/sec 0.1 m/sec

Problem: 

Problem 49 A hollow metallic sphere of radius 10 cm is charged such that potential of its surface is 70 volts. The potential at the centre of the sphere would be 70V 0V 700V 7V

Problem: 

Problem 50 A ball is thrown upwards with a velocity of 100m/sec. it will reach the ground after 10 sec 40 sec 5 sec 20 sec

Slide 53: 

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