question model for medican and engineering entrance physics

8/9/2019 Question Model for Medican and Engineering Entrance Physics

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Question 1:In the time-ratio control of a step-down chopper, if the on-time iskept constant at 2 ms, but the chopping frequency is decreased from200 Hz to 100 Hz, then average output DC voltage will be

1. Be the same2. Become half3. Become 2 times4. Become 2.5 times

Correct Answer: 2.Question 2:On moving a charge of 20 C by 2 cm, 2j of work is done. Then, thepotential different between the points is;

1. 0.1 V2. 8 V3. 2 V4. 0.5 V

Correct Answer: 1.Question 3:A thin film of liquid is enclosed between two glass plates. It isdifficult to separate the plates on account

1. Viscosity2. Friction3. Surface Tension4. Atmospheric pressure

Correct Answer: 3.


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Question 4:The ratio of phasor sum of the emfs induced in all the coilsdistributed in a number of slots less than one pole to thearithmetic sum of the emfs induced is known as

1. Breadth or distribution factor2. Coil span factor3. Pitch factor4. Winding factor

Correct Answer: 1.

Question 5:In phase shift oscillator, it consists of equal valued capacitorsand resistors connected in cascade. Each stage provides a phaseshift of

1. 302. 453. 604. 85

Correct Answer: 3.Question 6:Certain neutron starts (extremely dense stars) are believed to berotating at about 1 rev/s. If such a star has a radius of 20 km, theacceleration of an object on the equator of the star will be

1. 20103 m s-22. 120103 m s-23. 8105 m s-24. 4103 m s-2Correct Answer: 3.


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Question 7:The energy gap between valence and conduction bands in insulators isabout........

1. ,15eV,1.5eV,Zero,0.5eV,2. ,15eV,1.5eV,Zero,0.5eV,3. ,15eV,1.5eV,Zero,0.5eV,4. ,15eV,1.5eV,Zero,0.5eV,5. ,15eV,1.5eV,Zero,0.5eV,

Correct Answer: 1.

Question 8:The least expensive protection for over-current in low voltagesystem is

1. rewirable2. upto 22kv3. upto 33kv4. above 33kv

Correct Answer: 1.

Question 9:An air parallel plate capacitor has capacitance C. When a medium ofrelative permittivity K is introduced between the plates, thecapacitance is

1. C+K2. C-K3. CK4. C/KCorrect Answer: 3


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Question 10:An object is placed at a distance 18 CMs From a convex lens.The image is formed at a distance of 9 CMs. The focal length ofthe lens is1. 6 cms2. 9 cms3. 10 cms4. 18 cms

Correct Answer: 1.

Question 11:It takes two seconds for a sound to travel between two fixed pointswhen the day temperature is 10 degree C. If the temperature rises to30 degree C, the sound wave travels between to same fixed points in

1. 1.9 sec2. 2.0 sec3. 2.1 sec4. 2.2 sec

Correct Answer: 1.

Question 12:A convex lens of focal length 40cm is in contact with a concave lensof focal length 25cm. The power of combination is

1. -1.5D2. -6.5D3. 1.5D4. 6.5DCorrect Answer: 3.


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Question 13:A ball which is thrown up returns to the ground along aparabolic path. During the motion, its:1. Total energy is conserved2. Speed remains constant3. Horizontal component and Vertical component of the velocityremain constant4. Vertical component of velocity remains constant

Correct Answer: 1.

Question 14:_______________ Connectors utilize interposed optics at the joint inorder to expand the beam from the transmitting fiber end beforereducing it again to a size compatible with the receiving fiber end

1. Butt jointed2. Expanded beam3. Splicing4. Gel

Correct Answer: 2.

Question 15:______ is defined as the largest change in input quantity for whichthere is not output of the instrument

1. Drift2. Dead zone3. Fiedlity4. AccuracyCorrect Answer: 2.


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Question 16:A wire of resistance 1 ohm is stretched to double its length. Theresistance of the wire will become

1. 1 ohm2. .25 ohm3. 2 ohm4. 4 ohm

Correct Answer: 4.

Question 17:Avalanche photo diode bias voltages range are normally from_________ V to several hundred volts

1. 52. 33. 404. 20

Correct Answer: 3.

Question 18:It is a good absorber device as compared to gas tube TR

1. Reflective limiter2. Circulator3. Ferrite limiter4. TR limiter

Correct Answer: 3.


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Question 19:What is the correct arrangement of the following alloys indecreasing order of resistivity?

1. German silver - constantan - monel metal2. German silver - monel metal - constantan3. Constantan - monel metal - German silver4. Constantan - German silver - monel metal 11

Correct Answer: 3.

Question 20:A 53Hz reed type frequency meter is polarized with D.C. The newrange of frequency meter is

1. 106Hz2. 116Hz3. 16Hz4. 6Hz

Correct Answer: 1.

Question 21:A dynamo is sometimes said to generate electricity. It actually actsas a source of

1. Charge.2. Magnetism3. E.m.f.4. Energy.

Correct Answer: 3.


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Question 22:If a radio station transmits a signal of frequency 1500 khz thefrequency of the local oscillator to detect the signal in superheterodyne system of radio receiver is

1. 1500 khz2. 1955 khz3. 1000khz4. 1750 khz

Correct Answer: 2.

Question 23:While synchronizing a 3-phase alternator to the bus-bar theparalleling switch should be closed

1. Just before the pointer reaches the vertical position whenmoving in the fast direction2. Just after the pointer passes the vertical position whenmoving in the fast direction3. When pointer indicates fast position4. When pointer indicates slow position

Correct Answer: 1.Question 24:In a full wave rectifier circuit operating from 50Hz main, thefundamental frequency of ripple would be

1. 100 Hz2. 50 Hz3. 25 Hz4. zero

Correct Answer: 3.


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Question 25:In Youngs double slit experiment the central part has

1. Bright band2. Dark band3. Partially bright band4. Partially dark band

Correct Answer: 1.

Question 26: A body that reflects light that is balanced in allvisible wavelengths appears to the observer as

1. white2. black3. red4. blue

Correct Answer: 1.

Question 27:Tick out only the wrong statement in the following

1. A rainbow cam be seen only when the sun is on your back2. Sometimes two rainbows can be seen simultaneously3. The same rainbow can be observed by two persons if both havenormal vision4. Rainbow is formed due to refraction of light in rain drops.Correct Answer: 1.


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Question 31:The force F acting on a body moving in a circle of radius r isalways perpendicular to the instantaneous velocity v. The work doneby the force on the body in one complete rotation is

1. Fv2. F.2pr3. Fr4. 0

Correct Answer: 4.

Question 32:The inverse filtering approach has a disadvantage that it makes noexplicit provision for handling

1. ratio of power spectra should be known2. restrict difference between blurred image and blurredversion of the reconstructed image3. restrict the smoothness in restored image4. noise

Correct Answer: 4.

Question 33:Assume the earth to be a sphere of uniform density. What is itsrotational kinetic energy? Take the radius of the earth to be 6400km and the mass of the earth to be 61024kg

1. 2.61029J2. 2.61021J3. 2.61027J4. 2.61024JCorrect Answer: 1.


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Question 34:If a body looses half of its velocity on penetrating 3 cm in awooden block, then how much will it penetrate more beforecoming to rest?1. 42. 13. 24. 3

Correct Answer: 2.

Question 35:A magnet was found to vibrate at a place with a period of T. A pieceof brass of same length, breadth and mass was placed over themagnet. The new time period will be:

1. 2 T2. 2 T/23. T/24. T

Correct Answer: 3.

Question 36:Mobility is defined as

1. Diffusion velocity per unit field2. Drift velocity per unit field3. Displacement per unit field4. Number of free electrons/number of bound electrons

Correct Answer: 2.


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Question 37:The ___ transducer and corresponding field of excitation excitesmolecules in the traditional pie-shaped field.The ___ transducer and corresponding field of excitation excitesmolecules in the traditional pie-shaped field.

1. 1D2. 2D3. 3D4. 4D

Correct Answer: 2.

Question 38:Two pure inductors, each of self inductance L, are connected inparallel but are well separated from each other. The totalinductance is

1. L/42. L/23. L4. 2L

Correct Answer: 2.Question 39:____________ can increase fiber losses by letting high order modesleaks out of the core

1. Cladding2. Wave length3. Bending4. Core typeCorrect Answer: 3.


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Question 40:The A.C. servo motor is basically1. Two-phase induction motor2. Single phase induction motor3. Three phase induction motor4. DC motorCorrect Answer: 1.

Question 41:A semiconductor has an electron concentration of 8x10^13 per m3 andhole concentration of 5.5x10^12 per m3. The semiconductor is

1. n-type2. p-type3. Intrinsic semiconductor4. p-n junction5. None of these

Correct Answer: 1.

Question 42:The displacement of a particle at any instant is given by

X(t)=X(0)+at+bt^2. The acceleration of the particle is1. a2. b3. 2a4. 2b

Correct Answer: 4.


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Question 43:Which Of The Following Is A slow Process?

1. Isothermal2. Adiabatic3. Isobaric4. None

Correct Answer: 4.

Question 44:Armature winding in A.C machines

1. Is always closed one2. Is always open one3. May be either closed one giving delta connections or openone giving star connections4. Always semi closed

Correct Answer: 3.

Question 45:When the motor speed is equal to the reference speed

1. Motor torque is equal to the load torque2. Shaft torque is equal to the load torque3. Maximum torque is equal to shaft torque4. Stating torque is equal to shaft torque

Correct Answer: 1.


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Question 46:Ohm's law is not obeyed by.........

1. Electrolytes2. Discharge tubes3. Vacuum tubes4. All of these

Correct Answer: 4.

Question 47:1 mole of a gas with = 7/5 is mixed with 1 mole of agas with =

5/3, then the value of for the resulting mixture is1. 7/52. 2/53. 24/164. 12/7

Correct Answer: 3.

Question 48:Corona has the disadvantages of

1. Introducing the hormonics, pre dominately third hormonicsinto the transmissionlines2. works as a safely value for surges3. power gain4. in doesnot intenference with neigh bouring communicationckts

Correct Answer: 2.


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Question 49:The zig-zag moment of camphor

The zig-zag moment of camphor on water surface is due to variationof

1. Viscocity2. Temparature3. Density4. Surface tension

Correct Answer: 4.

Question 50:We have two spheres, one of which is hollow and the other solid.They have identical masses and moment of inertia about theirrespective diameters. The ratio of their radii is

1. 5:72. 3:53. route of 3:route of 54. route of 3:route of 7

Correct Answer: 3.

Question 51:The kinetic energy of a body can be increased the most by doublingits:

1. mass2. weight3. speed4. density

Correct Answer: 3.


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Question 52:A stone falls freely from rest and the total distance covered by itin the last second of its motion equals the distance covered by itin the first three seconds of its motion.The stone remains in theair for

1. 5 seconds2. 7 seconds3. 3 seconds4. none of the above

Correct Answer: 1.

Question 53:The temperature at which speed of sound in air becomes double itsvalue at 0 degree is

1. 546 degreeC2. 819 degreeC3. 273 degreeC4. 1092 degreeC5. 2184 degreeC

Correct Answer: 2.

Question 54:Germanium an Copper are cooled to 70 K from room temperature, then

resistance of1. Copper increases while that of Germanium decreases2. Copper decreases while that of Germanium increases3. Both decreases4. Both increases


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Correct Answer: 2.

Question 55:Which of the following makes of gallium arsenide?

1. zener diode2. pn junction diode3. npn transistor4. light-emitting diode

Correct Answer: 4.

Question 56:In Newton's reflecting telescope the objective isIn Newton's reflecting telescope the objective is

1. a concave lens2. convex lens3. concave mirror4. convex mirror

Correct Answer: 3.Question 57:Beam efficiency of an antenna will indicate

1. The amount of power in the side lobe compared to the majorlobe2. The amount of power in the minor lobe compared to the totalpower3. The amount of power in the back lobe compared to the totalpower4. The amount of power in the major lobe compared to the totalpower


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Correct Answer: 4.

Question 58:Wagner's earth is used with Schering Bridge for

1. grounding2. divert high current through bridge when specimen fails3. suppress spikes and high voltages4. eliminating stray capacitance and coupling

Correct Answer: 4.

Question 59:Two point charges +8Q and -2Q are located at x=0 and x=l

respectively. The location of a point on z-axis at which the netelectric field due to these two point charges is zero is?

1. 2L2. 8L3. L/44. 4L

Correct Answer: 3.Question 60:A separately excited DC motor is supplied from a fixed input DC

voltage through a step-down chopper system. In which quadrant canthe DC motor be operated by this system?

1. Forward motoring2. Forward braking3. Reverse motering4. Reverse braking


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Correct Answer: 1.

Question 61:Equal charges each of two coulomb are placed at points x = 0,2,4,8cm on the x-axis. The force experienced by the charge at x = 2cm

1. 15 N2. 5 N3. zero4. 10 N

Correct Answer: 4.

Question 62:At absolute zero, si acts as

1. non- metal2. metal3. insulator4. none of these

Correct Answer: 3.

Question 63:___________ is a grid of lines that serves as a scale when makingtime and amplitude measurement

1. Graticule2. Aquadag3. Astigmatism4. Focusing

Correct Answer: 1.


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Question 64:Choose the correct statement

1. Brewsters angle is independent of the wavelength2. Brewsters angle is independent of the material of thereflecting surface3. Brewsters angle depends on wave length but not on the natureof the reflecting surface4. Brewsters angle is different for different wave length

Correct Answer: 4.

Question 65:Tuning fork F1 has a frequency of 256 Hz and it produces 6 beats/secwith another tuning fork F2. When F2 is loaded with wax, it stillproduces 6 beats per second with F1. The frequency of F2 beforeloading should be

1. 253 Hz2. 250 Hz3. 259 Hz4. 262 Hz

Correct Answer: 4.

Question 66:If a mixture of 28g of Nitrogen, 4g of hydrogen and 8g of Helium iscontained in a vessel at temperature 400K and pressure 8.3*10^5 Pathen density of mixture is

1. 2g/L2. 3g/L3. 4g/L


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4. 5g/LCorrect Answer: 1.

Question 67:A bar magnet is placed inside a non-uniform magnetic field. Itexperiences

1. A force2. A torque3. Both force and torque4. Neither a force and a torque

Correct Answer: 3.

Question 68:Which one of the following statements is not correct for aregenerative steam cycle ?

1. It increases the thermodynamic efficiency2. It reduces boiler capacity for a given output3. It reduces temperature stresses in the boiler due to hotterfeed4. The efficiency increases with increased number of feedheaters

Correct Answer: 2.

Question 69:A duplex is a device which

1. switches an antenna between transmitter and receiver bymeans of selective filters2. switches an antenna between transmitter and receiver by


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means of gas switching tubes.3. neither of the above two4. connect at a time to transmitter or receivr only5.

Correct Answer: 2.

Question 70:A conducting circular loop of radius r carries a constant current i.It is placed in a uniform magnetic field B perpendicular to theplane of the loop. Then the magnetic force acting on the loop ispi=3.14

1. B*i*r2. 03. 2* pi* r* B4. pi* r* B

Correct Answer: 2.

Question 71:Coulomb is the unit of

1. Electric current2. Electric capacity3. Electric charge4. Electro motive force5. Electric power

Correct Answer: 3.


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Question 72:In an alternator, the use of short pitch coils having pitch of 160?

Will eliminate---harmonic component for the emf generated

1. 3rd2. fifth3. 7th4. ninth

Correct Answer: 4.

Question 73:The address bus of Intel 8085 is 16 bit wide and hence the memorywhich can be assessed by this address bus is

1. 2K Bytes2. 4K Bytes3. 16K Bytes4. 64K Bytes.

Correct Answer: 4.

Question 74:When a inductive coil connected to a 200 V, 50Hz ac supply with 10A

current flowing through it dissipates 1000 watts then which of thefollowing will have least value in ohms-

1. Resistance2. Reactance3. Impedance4. None

Correct Answer: 1.


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Question 75:An Isolation probe is used more compared to shielded probe because

1. it operates at low frequencies2. its Q factor is high3. it avoid the undesirable circuit loading effects4. its bandwidth is large

Correct Answer: 3.

Question 76:Starting from the origin, a body oscillates simple harmonically witha period of 2 s. After what time will its kinetic energy be 75% ofthe total energy?

1. 1/12 s2. 1/6 s3. 1/4 s4. 1/3 s.

Correct Answer: 2.

Question 77:In the time grade over current protection, which of the followingdiscrimination is incorporated?

1. Time2. Voltage3. Current4. Power

Correct Answer: 1.


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Question 78:In the case of an achromatic prism, there isIn the case of an achromatic prism, there is

1. deviation without dispersion2. dispersion without deviation3. refraction without deviation4. deviation and dispersion

Correct Answer: 1.

Question 79:The emf set up by the leakage flux due to self induction is calledthe ------ emf

1. leakage2. reactance3. self-induced4. mutual-induced

Correct Answer: 2.

Question 80:The application of wave length division multiplexing is________________ of existing point -to -point Fiber optictransmission links

1. Capacity upgrade2. Interference3. Wavelength4. Capacity decrease

Correct Answer: 1.


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Question 81:A thin layer of water is pressed between two glass plates so that

it spreads over an area A. If d is the distance between the platesand S the surface tension, the normal force required to separate theplates is

1. AS/d2. 2SA/d3. Ad/S4. S/Ad

Correct Answer: 2.

Question 82:The CCIR gives a standard of video intermediate frequency is________MHz

1. 72. 38.93. 554. 66.8

Correct Answer: 2.

Question 83:10. A ball released from the top of a tower of height h with zeroinitial velocity reaches the ground in T seconds. Where was the ballat the time T/2 seconds later?

1. h/4 m from ground2. 3h/4 m from ground3. h/3 m from ground.

Correct Answer: 1.


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Question 84:A tangential force F acts at the rim of a ring of radius R andcauses the ring to turn through an angle theta. Th work done by theforce will be

1. FR/theta2. FRtheta3. FR - 1/theta4. FR-theta

Correct Answer: 2.

Question 85:An error free compression which attacks inter pixel redundancies

that does not require prior knowledge of the probabilities ofoccurrence of the symbols to be encoded

1. hamming coding2. arithmetic coding3. huffman coding4. LZW coding

Correct Answer: 4.

Question 86:A bar magnet is placed inside a non-function magnetic field. It

experiences is ?1. A force and torque2. A force but not a torque3. A torque but not a force4. Neither a force nor a torque


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Correct Answer: 1.

Question 87:Work done from 250cals of heat is

1. 1045 ergs2. 1045 joules3. 1045 watt4. 1045 N

Correct Answer: 2.

Question 88:Absorption is related to the _________

1. Fiber material2. Attenuation3. Scattering4. Light signal

Correct Answer: 1.

Question 89:The method of neutral grounding affects the

1. Neutral is grounded2. Galvanized standard steel3. Zero sequence network4. Grounding of system neutral

Correct Answer: 3.


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Question 90:The unit of universal gas constant is

1. erg/mole/K2. dyne/mole/ K3. N/m4. dyne/cm2

Correct Answer: 1.

Question 91:The time period of a pendulum in stationary lift is T, if liftstarts accelerating in the downward direction, the time period will

1. Increase2. Decrease3. No change4. Nothing certain

Correct Answer: 1.

Question 92:A squall line is a term used to describe a

1. Fault Pattern2. Planet's Rotation3. Mountain Formation4. Weather Front

Correct Answer: 4.


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Question 93:A 30 V, 90 W lamps is to be operated on a 120 V.D.C line. For properglow, a resistor of ...... should be connected in series with thelamp

1. 30 ?2. 40 ?3. 10 ?4. 20 ?

Correct Answer: 1.

Question 94:To measure the power in AC circuits, the following meter is used1. voltmeter2. ammeter3. wattmeter4. AC bridge5.

Correct Answer: 3.

Question 95: In an orbital motion, the angular momentum vector is1. along the radius vector2. parallel to the linear momentum3. in the orbital plane4. perpendicular to the orbital plane

Correct Answer: 4.


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Question 96:The most penetrating radiation out of the following is

1. X rays2. alpa rays3. Beta rays4. Gamma rays5.

Correct Answer: 1.

Question 97:Two bullets are fired horizontally, simultaneously and withdifferent velocities from the same place. Which bullet will hit theground earlier?

1. It would depend upon the weights of the bullets2. The slower one3. The faster one4. Both will reach simultaneously

Correct Answer: 4.

Question 98:A spherical conductor of radius R, placed in air, is given a charge

Q. Then the potential at a point inside the conductor and at adistance R/2 from its centre is:

1. V= 4pe0 R2. V= 4peR3. V= 1/4pe0 Q/2R4. V= 1/4pe0 Q/R

Correct Answer: 4.


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Question 99:1 Horse power is equal to

1. 746 joule2. 74.6w3. 7.46w4. 746w5. None of the above

Correct Answer: 4.

Question 100:Pure water does not conduct electricity because it is

1. Almost not ionised2. Low boiling3. Neutral4. Readily decomposed

Correct Answer: 1.

question model for medican and engineering entrance physics

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