AFMC Physics 2010

AFMC–Past papers PHYSICS - UNSOLVED PAPER - 2010

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 Blue colour of sky is due to Interference Scattering Diffraction Total internal reflection

Problem 02 A rain drop becomes spherical as it comes closer to earth surface because of Surface tension Viscosity Gravity Air

Problem 03 If a pendulum is hang on a train moving with constant speed. Its time period will be Increases Decreases Remain unchanged None of these

Problem 04 A certain radioactive substance has a half-life of 1600 years. The fraction of a substance that will remain undecayed after 6400 years is a. 1/2 b. 1/4 c. 1/16 d. 1/32

Problem 05 The dimensions of impulse is [ML2T-2] [ML0T-1] [MLT-1] [MLT-2]

Problem 06 x = at + bt2, where x = distance, t = time, a and b are constants, then the unit b is km s km s-1 km s-2 km s2

Problem 07 Moving charge will produce Electric field only Magnetic field only Both electric and magnetic field None of these

Problem 08 Which one of the following is thrown out when placed in magnetic field? Diamagnetic Paramagnetic Ferromagnetic Ferrimagnetism

Problem 09 Power of a body is given in terms of following is ( where/= force, v = velocity) 1f/2V Fv2 Fv F2v2

Problem 10 1 volt is equivalent to a. b. c. d.

Problem 11 40°C in Fahrenheit scale is equal to 104°F 110°F 119°F 100°F

Problem 12 Sound waves of frequency less than 20 Hz is Ultrasonic Supersonic Audible Infrasonic

Problem 13 Which one of the following statement is wrong for light wave? They are transverse in nature. They can travel with speed of light. They don't requires any material medium for their propagation. They require material medium for their propagation

Problem 14 A ball is rolled off along the edge of table (horizontal) with velocity 4 m/s. It hits the ground after time 0.4 s. Which one of the following statement is wrong? (g = 10 m/s2) The height of the table is 0.8 m. It hits the ground at angle of 60° with the vertical. It covers a horizontal distance 1.6 m from the table. It hits the ground with vertical velocity 4 m/s.

Problem 15 Liquid of density p flows along a horizontal pipe of uniform area of cross section a with a velocity V through a right angled bend. What force should be applied to the bend to hold it in equilibrium? 2aρv2 aρv2 / √2 √2 aρ v2 aρ v2

Problem 16 When an elastic material with Young's modulus Y is subjected to a stretching stress S, the elastic energy stored per unit volume of the material is a. YS/2 b. S2Y/2 c. S2/2Y d. S/2Y

Problem 17 A vessel contains a mixture consisting of m1 = 7 g of nitrogen (M1 = 28) and m2 = 11 g of carbon dioxide (ML = 44) at temperature T = 300 K and pressure P0 = 1 atm. The density of the mixture is 1.446 g per litre 2.567 g per litre 3.752 g per litre 4.572 g per litre

Problem 18 An echo repeats four syllables. The distance of the reflecting surface, if it takes one-fifth of a second to pronounce or hear one syllable distinctly is (Velocity of sound = 340 m/s) 100 m 136 m 120 m 50 m

Problem 19 A source of sonic oscillations of frequency n = 2000 Hz and a receiver are located on the same normal to a wall. Both the source .and the receiver are stationary and the wall recedes from the source with a velocity n =10 cm/s. The beat frequency registered by the receiver (The velocity of sound is v = 340 m/s) 2.18 1.18 3.28 6.78

Problem 20 A thin metal plate M is inserted between the plates of a parallel plate capacitor as shown in figure. The new capacitance in terms of initial capacitance C is | 2C C/2 C Infinity

Problem 21 A bar magnet is placed with its north pole towards geographic north. The neutral point will be On the axial line On the equatorial line In between axial and equatorial line At 30° with the axial line

Problem 22 A galvanometer of resistance 25 Q is connected to a battery of 2 V along with a resistance in series. When the value of this resistance is 3000 Q, a full scale deflection of 30 units is obtained in the galvanometer. In order to reduce this deflection to 20 units, the resistance in series will be 4512 Ω 5413 Ω 2000 Ω 6000 Ω

Problem 23 A rectangular coil of 20 turns and area of crosssection 25 sq. cm has a resistance of 100 Q. If a magnetic field which is perpendicular to thetesla per second, the current in the coil is 1A 50 A 0.5 A 5A

Problem 24 For perfectly coupled coils, the coupling coefficient should be equal to One Zero Infinite More than one

Problem 25 In a reflecting astronomical telescope, if the objective (a spherical mirror) is replaced by a parabolic mirror of the same focal length and aperture, then The final image will be erect A large image will be obtained The telescope will gather more light Spherical aberration will be absent

Problem 26 Which one of the following is a possible nuclear reaction? a. b. c. d.

Problem 27 Which of the following statements is not true? The resistance of intrinsic semiconductor decreases with increase of temperature. Doping pure Si with trivalent impurities give p-type semiconductor The majority carriers in n-type semiconductors are holes. A p-n junction can act as a semiconductor diode

Problem 28 The transfer ratio β of a transistor is 50. The input resistance of the transistor when used in the common-emitter configuration is 1 kΩ. The peak value of the collector a.c. current for an ac input voltage of 0.01 V peak is 100 µ A 0.01 µ A 0.25 µ A 500 µ A

Problem 29 Given below are four logic gates symbols. NAND, NOR and OR are respectively (iv), (iii), (i) (ii), (iii), (iv) (i), (ii), (iii) (i), (iv), (ii)

Problem 30 A beam of light of wavelength 600 ran from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark frings on either side of the central bright fringe is 1.2 cm 1.2 mm 2.4 cm 2.4 mm

Problem 31 Given: A = 2i-3j-k and B = -6i +9j + 3k which of the following statements is correct? A and B are equal vectors A and B are parallel vectors A and B are perpendicular vectors None of these

Problem 32 Which of the following pair does not have similar dimensions? Stress and pressure Tension and surface tension Angle and strain Planck's constant and angular momentum

Problem 33 The power and type of lens by which a person can see clearly the distant objects, if the person cannot see objects beyond 40 cm, are -2.5 D and concave lens -2.5 D and convex lens -3.5 D and concave lens -3.5 D and convex lens

Problem 34 If a proton and an electron have same de Broglie wavelength, then Both have same kinetic energies Proton has more kinetic energy than electron Electron has more kinetic energy than proton Both have same velocity

Problem 35 In a transistor amplifier, β = 62, RL = 5000Ω and input resistance of the transistor is 500Ω. What is power amplification? 6200 45850 38440 15320

Problem 36 The magnetism of a magnet is due to The earth Cosmic rays The spin motion of electrons Pressure of big magnet inside the earth

Problem 37 A cube of side b has a charge q at each of its vertices. The potential due to this charge array at the centre of the cube is a. Zero b. c. d.

Problem 38 A plane electromagnetic wave propagating in the x-direction has wavelength of 6.0 mm. The electric field is in the indirection and its maximum magnitude is 33 Vm-1. The equation for the electric field as function of x and t is 11 sin π(t - x/c) 33 sin π * 1011(t-x/c) 33 sin π (t - x/c) 11 sin π* 1011(t-x/c)

Problem 39 A gaseous mixture consists of 16 g of helium and 16 g of oxygen. The ratio Cp/Cv of the mixture is 1.4 1.54 1.59 1.62

Problem 40 If Cp and Cv denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then CP-CV =28/R CP-CV =R/28 CP-CV =R/14 CP-CV =R

Problem 41 In Young's double slit experiment, the distance between the two slits is 0.1 mm and wavelength of light used is 4 * 10-7 m. If the width of fringe on screen is 4 mm, the distance between screen and slits is 0.1 mm 1 cm 0.1 cm 1 m

Problem 42 The number of turns in the primary coil of a transformer is 200 and the number of turns in secondary coil is 10. If 240 V a.c. is applied to the primary, the output from secondary will be 48 V 24 V 12 V 6 V

Problem 43 Two bulbs of 500 W and 300 W are manufactured to operate on a 220 V line. If their resistances are R1 and R2 respectively, then value of R1/R2 is 5/3 3/5 25/9 9/25

Problem 44 A copper rod of length I is rotated about the end perpendicular to the uniform magnetic field with constant angular velocity co. The induce e.m.f. between the two ends is 2Bωl2 Bωl2 1/2 Bωl2 1/4 Bωl2

Problem 45 Equal current I flows in two segments of a circular loop in the direction shown in figure. Radius of the loop is r. The magnitude of magnetic field induction at the centre of the loop O is a. Zero b. c. d.

Problem 46 The escape velocity of an object from the earth depends upon the mass of the earth (M), its mean density (p), its radius (R) and gravitational constant (G). Thus the formula for escape velocity is a. b. c. d.

Problem 47 In the arrangement shown in figure, coefficient of friction between the two blocks is The force of friction acting between the two blocks is 8 N 10 N 6 N 4 N

Problem 48 A wooden block of mass m resting on a rough horizontal table is pulled by a force F as shown in figure. If n is the coefficient of friction between block and table, its acceleration will be a. b. c. d.

Problem 49 Moment of inertia of a uniform rod of length L and mass M, about an axis passing through L/4 from one end and perpendicular to its length is a. b. c. d.

Problem 50 A flywheel rotates with a uniform angular acceleration. Its angular velocity increases from 20n rad/s to 4071 rad/s in 10 seconds. How many rotations did it make in this period? 80 100 120 150

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AFMC Physics 2010

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