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AFMC–Past papers PHYSICS- UNSOLVED PAPER - 2000
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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 What is the weight of a 700 g wt body on a pianet whose mass is 1/7th of that of the earth and radius is 1/2 of earth 400 g.wt 300 g.wt 700 g.wt 500 g.wt.
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Problem 02 Two masses m1 and m2 are suspended together by a massless spring of spring constant k. When the masses are in equilibrium m1 is removed without disturbing the system, then the angular velocity of oscillation of m2 is a. b. c. d.
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Problem 03 Three charges each equal to q are placed at corners of an equilateral triangle. If the force between any two charges is F, then net force on each charge will be a. 3F b. 2F c. d.
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Problem 04 A moving charge produces Electric field only Magnetic field only Both electric and magnetic field None of these
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Problem 05 The density of nucleus is of order of 103 kg/m3 1012kg/m3 1017 kg/m3 1024 kg/m3
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Problem 06 The energy gap between conduction band and valence band is order of 0.07 eV. It is a Insulator Conductor Semiconductor Alloy
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Problem 07 A wooden cube just floats inside water when a 200 g mass is placed on it. When the mass is removed the cube is 2 cm above water level. The size of cube is 5 cm 10 cm 15 cm 20 cm
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Problem 08 A train is moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction. The relative velocity of train with respect to car is 17 m/s 33 m/s 17.5 m/s None
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Problem 09 Ratio of inertial mass to gravitational mass is 0.5 1 2 No fixed number
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Problem 10 The resultant of two forces is 20 N. When one of the force is 20 √3N and angle between two forces is 30°. Then what is the value of second force? 10N 20 N 20√3 N 10 √3 N
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Problem 11 In which medium sound travel faster? Steel Water Air Vacuum
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Problem 12 The Bernoulli's theorem is based on the conservation of Mass Energy Momentum All
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Problem 13 A bulb of 100 W, 220 V is operated on a line o 110 V, then what will be the power consumed 25 W 75 W 50 W 90 W.
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Problem 14 When speed of 30 miles/hr is converted to ft/sec. then it will be 88 ft/sec 44 ft/sec 66 ft/sec 22 ft/sec
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Problem 15 Specific resistance of a wire depends upon Length Cross-section are Mass None
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Problem 16 In a simple pendulum if kinetic energy is on fourth of total energy, then displacement (x) I related to amplitude A, as x = A x = 2 A X=√2/4A X=√3/4A
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Problem 17 The velocity of light in glass, whose refractive index is 1.5 is 2 x 108 m/s. In certain liquid, the velocity of light is found to be 2.6 x 108 m/s. The refractive index (µw) of that liquid is 1.15 1.2 1 2.1
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Problem 18 1 gm of ice at 0°C is mixed with 1 gm of water at 100°C. The resulting temperature will be ∞ 10°C 0°C 5°C
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Problem 19 An α-particle and a proton are accelerated at same potential difference from rest. Find the ratio of their final velocity. √2 :1 1 : 1 1 : √2 1 : 2
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Problem 20 Find the total displacement of a body in 8 sec. starting from rest with an acceleration of 20 cm/sec2. 0.064 m 640 cm 64 cm 64 m
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Problem 21 If water in a closed bottle is taken up to the moon and opened, the water gets Freeze Boiled Dissociated into O2 and H2 Evaporated
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Problem 22 Speed of a 2 cm radius ball in a viscous liquid is 20 cm/s. Then the speed of 1 cm radius ball in the same liquid is 5 cm/s 10 cm/s 40 cm/s 80 cm/s
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Problem 23 The displacement of a particle is given by Y = a + bt + ct2 - dt4. The initial velocity and acceleration are respectively b, - 4 d -b, 2c b, 2c 2c, -Ad
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Problem 24 Two soap bubbles of radii r] and r2 are joined together by thin surface. The radii of the two bubbles together is a.r1 + r2 b. c. d.
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Problem 25 A lens of refractive index 1.5 is dipped into a medium of refractive index 1.5. The new refractive index of lens is 1.5 1.5 x 1.5 1 1.5 + 1.5
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Problem 26 A ball of mass a with a velocity b is made to hit a target of mass c and got embedded into it. Find the velocity of the final system. a ax.b a. b. c. d.
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Problem 27 A planet which is twin sister of Earth is Mercury Venus Mars Jupiter
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Problem 28 Terminal velocity of a body with radius r directly proportional to R1 r 2 r -1 r2
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Problem 29 A thief stole a box with valuable article of weight W and jumped down a wall of height h. Before he reached ground he experienced a load of 2 W W W/2 Zero
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Problem 30 A bullet (m1 = 25 g) is fired with a velocity 400 m/s gets embedded into a bag of sand (m2 = 4.9 kg) suspended by a rope. The velocity gained by the bag is 0.2 m/s 8 m/s 4 m/s 2 m/s
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Problem 31 If a planet consists of a satellite whose mass and radius are both half that of earth. Acceleration due to gravity (g) at its surface would be 4.9 m/s2 9.8 m/s2 19.6 m/s2 29.4 m/s2
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Problem 32 In Young's experiment, fringe width was found to be 0.4 mm. If whole apparatus is immersed in water of refractive index (n) = 4/3, new fringe width is 0.25 mm 0.30 mm 0.40 mm 0.53 mm
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Problem 33 Hollow spherical conductor with a charge of 500 it µC is acted upon by force 562.5 N. What is E at its surface? Zero 1.125 x 10 6 N / C 2.25 x 106 N/C 4.5 x 106N/C
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Problem 34 Masses of three wires of copper are in the ratio 1 : 3 : 5 and lengths are in the ratio 5 : 3 : 1. Then the ratio of their electrical resistance are 1 : 3 : 5 5 : 3 : 1 1 : 15 : 125 125 : 15 : 1
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Problem 35 If we remove the atmosphere of earth then the duration of day will Increase Decrease Will remain same Depends upon season
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Problem 36 The 1st excitation energy of hydrogen atoms is 9.23 x 10-9 J 9.23 x 10-15J 9.23 x 10-24J None
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Problem 37 A hydro electric plant is at 550 m higher than sea level and water is supplied from a height of 50 m above the sea level. Weight of water is 2000 kg. What is the power supply per sec, if efficiency is 80% 8 kW 10 kW 40 kW 9 kW
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Problem 38 The velocity of light in vacuum can be changed by changing Frequency Amplitude Wavelength None of these
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Problem 39 Rainbow is formed due to Reflection Refraction Scattering Dispersion
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Problem 40 A 60 W bulb is hung over the centre of a 4 m x 4 m table at a height of 3 m, the ratio of the intensities of illumination at the centre of an edge and at a corner of table is a.17/13 b.(17/3)3 c. d.
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Problem 41 The electric intensity due to a uniformly charged infinite cylinder of a radius R at a distance r (>R) from its axis is proportional to r2 r3 1/r 1/r2
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Problem 42 Two heaters coils separately take 10 min. and 5 min. to boil a certain amount of water. If both the coils are connected in series, the time taken will be 15 min 7.5 min 10/3Min 2.5 min
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Problem 43 The speed of a boat is 5 km/hr in still water. If it crosses a river of width 1 km along the shortest possible path in 15 minutes, then velocity of the river water is 4 km/hr 3 km/hr 2 km/hr 1 km/hr
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Problem 44 The frequency of a photon, having energy 100 eV is (h = 6.6 x 10-34 J-s) 2.42x 1026Hz 2.42 x 1016Hz 2.42 x 1012 Hz 2.42x109Hz
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Problem 45 At a certain place the horizontal component of Earth's magnetic field is √3 times the vertical component. The angle of dip at that place is 75° 60° 45° 30°
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Problem 46 A substance reduces to 1/16th of its original mass in 2 hours. Calculate the half-life of the substance 15 min 30 min 60 min 90 min
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Problem 47 The quantum nature of light derives its evidence support from observation that Radiation spectrum of black body Light can be reflected Light shows polarizing effects Light can be diffracted
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Problem 48 If coefficient of cubical expansion is x-times the coefficient of superficial expansion, then x is 2.5 1.5 3 2
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Problem 49 An electric charge q moves with a velocity v ir a uniform magnetic field B. The forces experienced by the charge is Zero, if B is perpendicular to v Zero, if B is parallel to v Always zero Never zero
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Problem 50 A gas behaves as ideal gas at Low pressure and high temperature High pressure and low temperature Low pressure and low temperature High pressure and high temperature
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