AFMC Physics 2006

AFMC–Past papers PHYSICS- UNSOLVED PAPER - 2006

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 A person is standing between two cliff. A sound is produced, the person hears echos after 3 second and 6 second. Velocity of sound in air = 336 m/s. The separation between two cliff is 1344 m 2688 772 m none of these

Problem 02 An observer moving away from a stationary source. The observed frequency is half of the emitted frequencies. The velocity of observer is (c = speed of sound in air) c c/2 c/3 2c.

Problem 03 When a thief with weight w on his head jumps from building, what weight will be observed? Zero w w/2 none df these

Problem 04 Frequency of stretched string will increase by decreasing tension and increasing density of material of wire keeping tension constant and increasing density keeping tension constant and decreasing density none of these

Problem 05 If / and l2 are the lengths of air columns for the first and second resonance when a tuning fork of frequency f i s sounded on a resonance tube, then the velocity of sound v in air is given by V=2f(I2-I1) b. c. d.

Problem 06 A pan is suspended from a steel wire. Weights are slowly put on the pan and as the weight increases, the change in the length of the steel wire will be uniform in the beginning and later the change will increase uniform throughout non-uniform throughout none of these

Problem 07 Two point charges + 2 coulomb and +10 coulomb repel each other with a force of 12 N. Charges of-2coulomb are given to each of these charges, then the force of interaction is 12 N 6 N ON 18 N

Problem 08 An object is placed in front of a convex lens of focal length 20 cm. A convex mirror of radius of curvature 15 cm is placed before the lens at cm so that object and image coincide. 25 cm 455 cm 40 cm none of these

Problem 09 Velocity of sound in air is given as 300 m/s. Then r.m.s. velocity in air is a. b. c. d. none of these

Problem 10 According to kinetic theory of gases kinetic energy of gas molecule will depend upon temperature molecular weight pressure volume

Problem 11 Sound production from tape recorder makes use of crests and troughs magnetic energy electric energy none of these

Problem 12 A current is flowing through resistance. A potential difference of 120 V is applied across resistance. Power dissipated in resistance is 60 W. Find current flowing through it 2 A 0.5 A 1 A 2.5 A

Problem 13 A body is moving in a vertical circle. The string must remain taut at the highest point. The centripetal acceleration when string is horizontal is 3g 5 g g 2 g

Problem 14 Which of the following is the function of the step-up transformer? low voltage, high current to high voltage and low current low voltage, low current to high voltage and high current high voltage for quick transport none of the above.

Problem 15 The current through an inductor changes from 3A to 2A is 1 m/s. If induced e.m.f. in inductor is 5 V then L is 5 x 10-2 H 5 x 10-3 H 2.5 x 10- 11 none of these

Problem 16 During production of cathode ray d.c. source is connected across cathode ray tube a.c. source is connected across cathode ray tube electric field is perpendicular to magnetic field magnetic field is applied across tube

Problem 17 Two springs of spring constant Kl and K, are connected in series. Then equivalent spring constant is a. K1+K2 b. c. d.

Problem 18 A car is moving with uniform acceleration. It covers 200 m in 2 sec and 220 m in next 4 sec. The velocity of car at the end of 7th second from start is 1 m/s 0.1 m/s 10 m/s 20 m/s

Problem 19 A body of mass 4.975 kg is lying on the frictionless floor. A mass of 25 gm moving with 400 m/s strikes the mass and gets embedded into it, The velocity of the body combined after collision is 2 m/s 4 m/s 1 m/s none of these

Problem 20 Time period of the rotation of the earth about its own axis is 24 hr. Mass and radius of the earth are 6 x 1024 kg and 6.4 x106 m respectively. The rotational kinetic energy of the earth about its own axis is 2.6 x 1029 J -2.6 x 1024 J 2.6 x 1032 J 2.6 x 1034 J

Problem 21 Length of second's pendulum is 100 cm 60 cm 120 cm 80 cm

Problem 22 Photoelectric current from a given photocell will depend upon number of photons striking per second frequency of incident photon material of the target none of the above

Problem 23 In N-type semi-conductor current is due Electrons holes electrons and holes none of these

Problem 24 B is doped in Si or Ge, then we will get P-type semiconductor N-type semiconductor an insulator a conductor

Problem 25 The order of distance of an electron revolving in an atom from nucleus is 10-12 m 10-10 m 10-8 m 10-14 m

Problem 26 In which case positive work has to be done in separating them? electron-electron proton-proton neutron-neutron electron-neutral atom.

Problem 27 The order of the electric field near the earth'; surface is 100 v/m 500 v/m 200 v/m none of these

Problem 28 In adiabatic expansion, product of PV decreases increases changes erratically none of these

Problem 29 34 gm of water at 30°C is poured into a calorimeter at 15°C. The temperature of water is 20°C whe: equilibrium is achieved. The water equivalent of the calorimeter is 68 g 34 g 136 g 17 g

Problem 30 A galvanometer is converted into an ammeter by connecting low resistance in parallel low resistance in series high resistance in series high resistance in parallel

Problem 31 We get Balmer series when electron comes from higher to 2nd orbit 2nd to higher orbit higher to first orbit first to higher

Problem 32 In the displacement method, a convex lens is placed between an object and a screen. The displacement between two positions of the lens being x. If the magnification in the positions are m1 and m2, the focal length of the lens is a. b. c. d.

Problem 33 Magnification of a microscope can be increased by increasing power of objective and eye lens decreasing power of objective and eye lens increasing power of objective and decreasing power of eyepiece decreasing power of objective and increasing power of eyepiece

Problem 34 Find potential difference across 30 mF capacitor 20 V 10 V 30 V none of these

Problem 35 Magnetic susceptibility of a material is given as M/H M2/H2 M x H H/M

Problem 36 Which is false for a light coming out of a nicol prism? ray is circularly polarised double refraction total internal reflection none of these

Problem 37 An electron can accelerated with the help of cyclotron betatron bevatron oscillograph

Problem 38 Ice is wrapped in black and white cloth. In which cases more ice will melt white black in both cases equal amount will melt none of these

Problem 39 A cell of emf E and internal resistance r is connected across an external resistance (R = r). The potential difference across cell E/2 E/u E 0

Problem 40 Mass and diameter of a ring is 2 kg and 1 m respectively. The moment of inertia of ring about an axis is passing through its C.M. and perpendicular to the plane of the ring is 0.5 kg m2 1 kg m2 1.5 kg m2 2 kg m2

Problem 41 A force 5 N is acting an object. Displacement of object is 10 m and work done on it is 25 J. The angle between force and displacement is 30° 60° 90° 0°

Problem 42 Surface tension of a solution is 30 * 10-2 N/m. The radius of the soap bubble is 5 cm. The surface energy of soap bubble is 1.8 * 10-2 J 1.8 * 102 J 1.0 * 10-1 J 1.8 * 10-2 J

Problem 43 A bubble is rising from bottom of a lake. The volume of bubble becomes 8 times as it reaches the top. The atmospheric pressure is equal H, The depth of the lake is H 83 m 73 m none of these

Problem 44 Length of a conductor is 50 cm radius of cross section 0.1 cm and resistivity of the conductor = 5 x 10-5 Ωcm-1. The resistance is 8 x 10-2 Ω 8 x 10-3 Ω 8 x 10-1 W none of these

Problem 45 A bi-convex lens becomes a concave lens, if it is immersed in a liquid of same refractive index less refractive index greater refractive index none of the above

Problem 46 The emission line of Lyman corresponds to the absorption line in laboratory temperature. The emission line of Balmer at room temperature corresponds to the absorption line of Balmer series does not correspond to any absorption line because no absorption lines can be obtained it will be greater than Balmer absorption lines it will be less than Balmer absorption lines

Problem 47 If the minimum energy of photons needed to produce photoelectrons is 3 eV, bombarding the photoelectric material by a number, of photons of 2.5 eV also one can get photoelectrons of the same kinetic energy photoelectrons of higher kinetic energy higher current none

Problem 48 The energy of the groundstate (n = 1) of hydrogen level is - 1 3 . 6 eV. The ionization potential of the hydrogen atom is -13.6 eV 13.6 V +13.6eV more than -13.6 eV

Problem 49 The image seen on a plane mirror is a real image and therefore can be photographed a virtual image therefore cannot be photographed a virtual image but it can be photographed none

Problem 50 Ohm's law valid only for conductors for semiconductors for triode valves for all materials

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AFMC Physics 2006

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