AFMC Physics 1997

AFMC–Past papers PHYSICS- UNSOLVED PAPER - 1997

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 Light from a bulb falls on a metal piece but no photoelectrons are emitted because work function of metal is Equal to energy of photon Much higher than the energy of photo Less than energy of photon None of these

Problem 02 Which of the following graph represents the variation of magnetic flux density B with distance r for a straight long wire carrying an electric currenct? a. b. c. d.

Problem 03 The major constituents of transistors are Transistor Conductors Insulators Semiconductors

Problem 04 The force keeping the planets into a circular orbit is Gravitational force Electrostatic force Magnetic force Nuclear force

Problem 05 Which of the following metals is liquid at 300c? Bismuth Tin Cesium Mercury

Problem 06 The angular speed of a fly-wheel making 120 revolutions/minute is 4π π 4π2 2π

Problem 07 To convert a galvanometer in to an ammeter, we connect High resistance in series Low resistance in series High resistance in parallel Low resistance in parallel

Problem 08 Two identical p-n junctions may be connected in series with a battery in three ways as shown in figure. The potential drops across the two p-n junctions are equal in Circuit 2 and circuit 3 Circuit 1 only Circuit 1 and circuit 2 All of these circuits

Problem 09 Density of water is 103 Kg/m3 1 Kg/m3 10 Kg/m3 103 Kg/m3

Problem 10 If half-life of a radioactive atom is 2.3 days, then its decay constant would be 1 1.6 2.3 0.3

Problem 11 Unit of resistance is a. Volt/Amp b. Volt*Amp c. Amp/Volt d. Volt2*Amp

Problem 12 The count rate of a Geiger Muller counter for the radiation of the α radioactive material of half-life of 30 minutes decreases to 5 second-1 after 2 hours. The initial count rate was 25 sec-1 625 sec-1 20 sec-1 80 sec-1

Problem 13 A car when passes through a convex bridge exerts a force on it which is equal to a. b. Mg c. d.

Problem 14 Atomic packing fraction of simple cubic cell is a. b. c. d.

Problem 15 Rutherford’s α-scattering experiment predicts that Electrons are scattered in the space Electrons are revolving around the nucleus The velocity of all electrons are same These is a heavy mass at centre

Problem 16 A cylinder of 500 gm and radius of 10 cm has the moment of inertia (about its natural axis) 5.2 x 10-3 kh-m2 6.5 x 10-3 kh-m2 7.1 x 10-3 kh-m2 8.7 x 10-3 kh-m2

Problem 17 What is the effective capacitance between points X and Y? 24 μF 18 μ F 12 μ F 6 μ F

Problem 18 The direction of motion of a projectile at the highest point of its trajectory becomes Tangentional Horizontal Vertical None of these

Problem 19 700pF capacitor is charged by a 50 V battery. How much electrostatic energy is stored by it? 13.6 x 10-9J 6.7 x 10-7J 17.0 x 10-8J 8.7 x 10-7J

Problem 20 Cyclotron is a device to Accelerate protons Measure charge Accelerate electrons Measure voltage

Problem 21 A bass of mass 0.1kg coming with speed 40 m/s strikes with a bat and returns in opposite direction with speed 30 m/s, then the impulse is? 1 kg-m/s 4 kg-m/s 7 kg-m/s 3 kg-m/s

Problem 22 A ball falling in a lake of depth 200 m experience change of volume by 0.1% at the bottom, what is the bulk modulus of the material of the ball? 19.6 x 108 N/m2 19.6 x 10-10 N/m2 19.6 x 1010 N/m2 19.6 x 10-8 N/m2

Problem 23 If the ratio of amplitude of two waves is 4:3 then ratio of maximum and minimum intensity on interferences is 1:49 16:9 49:1 9:16

Problem 24 If a body starts form rest and travels 1.2 m in the 8th second then what is the acceleration? 0.08m/s2 0.20 m/s2 0.225 m/s2 0.16 m/s2

Problem 25 Weber/m2 is equal to Watt Tesla Dynes Henry

Problem 26 Soap bubble looks colored due to Scattering Dispersion Reflection Interference

Problem 27 Which of the following physical quantities is dimensionless? Specific gravity Angle Strain All of these

Problem 28 A bread gives a boy 5000 calls. How much height he can climb by using this energy, if his efficiency is 28%? ( mass of the boy = 40 kg) 15m 5m 22.5m 10m

Problem 29 Which of the following is not a semiconductor? Arsenic Germanium Silicon All of these

Problem 30 What is the dot product of two vectors of magnitude 3 and 5 if angle between them is 600? 7.5 9.5 5.2 8.4

Problem 31 Which of the following is not a vector quantity? Torque Speed Displacement Velocity

Problem 32 Which one of the following works as conservation of linear momentum? Space craft Rocket Aero plane Helicopter

Problem 33 Dimension of torque is ML2T-2 ML2Y1 M2LT2 ML0T-1

Problem 34 At what height from the earth’s surface, the acceleration of gravity will be half the value of g at surface? (R = 6400km) 2650km 3200km 2500km 3050km

Problem 35 Candela is the unit of illuminance light intenxity sound luminous flux

Problem 36 if a capacitor of capacitance C is connected in series with an inductor of inductance L then the angular frequency is a.√L/C b. √LC c. √1/LC d.LC

Problem 37 If a magnetic dipole is rotated through an angle Ѳwith respect to the direction of the magnetic field of intensity (H), then work done is MH(1 - sin Ѳ) MH MH cosѲ MH (1 - cos Ѳ )

Problem 38 A glass rod 20 cm long is clamped at the middle. It is set into longitudinal vibrations. The velocity of sound in glass, if the emitted sound frequency is 4000 Hz is 2200 m/s 1600 m/s 2600 m/s 1800m/s

Problem 39 Which of the following waves do not show polarization? Longitudinal waves in gas Electromagnetic wave Sinusoidal waves Transverse waves in gas

Problem 40 If a wire of resistance 20 Ω is covered with ice and a voltage of 210V is applied across the wire, then rate of melting of ice is 2.1 g/sec 6.6 g/sec 1.1 g/sec 4.2 g/sec

Problem 41 Water falls from a height 500m. what is the raise in temperature of water at bottom, if the whole energy remains in the water? (specific heat of water = 4200J/kg0C) 0.240C 1.160C 0.190C 0.400C

Problem 42 Find the equivalent resistance of two branched circuit as shown in figure 4kΩ 2 kΩ 5 kΩ 3 kΩ

Problem 43 The projection lens of a projector has focal length 5 cm it is desired to get an image with a magnification 30. The distance of the screen from the lens must be 0.35 m 0.55 m 1.55m 5.5m

Problem 44 The time required for a ray o f light to pass through a glass slab of 2 mm thick is ( g=1.5) 10-8sec 10-11sec 10-6sec 10-9sec

Problem 45 A source of sound is travelling with a velocity 40km/hr towards an observer and emits sound of frequency 2000Hz. If velocity of sound is 1220 km/hr, then what is the apparent frequency heard y an observer? 1980Hz 2068Hz Same frequency 2180Hz

Problem 46 Who among the following gave the first experimental value of G? Cavendish Galileo James watt Newton

Problem 47 First law of thermodynamics is a consequence of the conservation Energy Charge Heat All of these

Problem 48 The energy stored in the spring of a hand watch is Sound energy Heat energy Kinetic energy Potential energy

Problem 49 If momentum is increased by 20% then kinetic energy increases by 40% 48% 36% 44%

Problem 50 Diode can work as Modulator Amplifier Demodulator Rectifier

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AFMC Physics 1997

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