# MCAT/MCAT Physics Mcq Questions Electronics Sample Test,Sample questions

1.?B/r22-r12/?t

2.?B(r2-r1)2/?t

3.?B(r22-r12)/?t

4.?B(r22+r12)/?t

1.0 volt

2.3.125 volt

3.31.25 volt

4.0.03125 volt

## Question: `A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience`

3.An upward force along the axis

4.No resultant force

## Question: `A.C can not be used for`

1.producing heat

2.producing light

3.Magnetizing iron

4.Producing magnetic field

## Question: `Acceptor and donor impurities donate`

1.n-carriers only

2.p-carriers only

3.p-carriers and n-carriers respectively

4.n-carriers and p-carriers respectively

1.150msec-1

2.384msec-1

3.38.4msec-1

4.200msec-1

## Question: `An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called`

1.Induced current

2.Eddy current

3.Back emf

4.None of the above

## Question: `Depletion region of a junction is formed`

1.during the manufacturing process

2.under forward bias

3.under reverse bias

4.when temperature varies

## Question: `Electrons present in p-type material due to thermal pair generation are`

1.majority carriers

2.minority carriers

3.dual carriers

4.blockers

## Question: `For long distance transmission the transformer used is`

1.Step down

2.Input voltage and output voltage remain same

3.Step up

4.Amplifier is used

## Question: `Forward current through a semi conductor diode circuit is due to`

1.minority carriers

2.majority carriers

3.holes

4.electrons

## Question: `Hole is equivalent to`

1.a negative charge

2.a positive charge

3.a neutral particle

4.an electron

## Question: `Identify the correct statement about minority carriers`

1.holes in n-type and free electrons in p-type

2.holes in n-type and p-type

3.free electrons in n-type and holes in p-type

4.free electrons in n-type and p-type

## Question: `In a half-wave rectifier the r.m.s. value of the A.C. component of the wave is`

1.Equal to D.C. value

2.More than D.C. value

3.Less than D.C. value

4.Zero

## Question: `In full wave rectification the output D.C. voltage across the load is obtained for`

1.The positive half cycle of input A.C.

2.The negative half cycle of input A.C.

3.The complete cycle of input A.C.

4.All of the above.

## Question: `In half-wave rectification the output D.C. voltages is obtained across the load for`

1.The negative half cycle of A.C.

2.The positive half cycle of A.C.

3.The positive and negative half cycles

4.Either positive or negative half of A.C.

1.collector

2.emitter

3.base

4.any of above

## Question: `In p-n-p transistor the collector current is`

1.equal to emitter current

2.slightly less than emitter current

3.greater than emitter current

4.any of above

## Question: `In the transistor schematic symbol, the arrow`

1.is located on the emitter

2.is located on the base

3.is locate on the collector

4.points form north to south

1.Retaintivity

2.Permeability

3.Flux

4.Hysteresis

## Question: `Long distance transmission is easy for`

1.D.C voltage

2.A.C voltage

3.Half A.C voltage

4.Half D.C voltage

## Question: `Magnetic compass needle will be deflecting if it is kept near`

1.Static charge

2.Soft iron

3.Semi-conductor

4.Accelerating charge

## Question: `Non inductive resistances are used in decreasing`

1.Mutual inductance

2.Self inductance

3.Magnetic fields

4.Heating effect

1.capacitor

2.inductor

3.on switch

4.off switch

1.??n2?A

2.??n2A/?

3.??N2?A

4.BA

1.pentavalent

2.trivalent

3.divalent

4.tetravalent

1.n

2.p

3.mix

4.any of above

1.1?s

2.1.5?s

3.106sec

4.1sec

## Question: `The alternating voltage is an example of`

1.A digital waveform

2.An analogue waveform

3.Discrete waveform

4.None at all

## Question: `The device or circuit used for conversion of A.C. into D.C. is called`

1.An amplifier.

2.A rectifier

3.Filtering circuit

4.Converter.

1.Converter

2.A rectifier

3.Inverter

4.Oscillator

1.ms-1A

2.ms-2A-1

3.kgms2A-1

4.kgm2s-1A-1

## Question: `The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to`

1.Magnetic flux density

2.Torque

3.Mutual induction

4.Motional emf

## Question: `The especially designed semiconductor diodes used as indicator lamps in electronic circuits are`

1.The switch

2.The light emitting diode

3.The photo diodes

4.Solar cells.

## Question: `The operational amplifier is`

1.A high gain amplifier

2.A high-power amplifier

3.A high resistance amplifier

4.A low resistance amplifier

1.03-Jan

2.3

3.1

4.6

## Question: `The rectangular voltage is an example of`

1.An analogue waveform

2.Continuous wave form

3.Electronic waveform

4.A digital waveform

## Question: `The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core`

1.Decreases the resistance of the solenoid

2.Reduces the effect of eddy current

3.Improves the flux linkage between the turns of the coil

4.Increases the mutual inductance between the solenoid and the core

## Question: `The semiconductor diode can be used as a rectifier because _`

1.It has low resistance to the current flow when forward biased & high resistance when reverse biased.

2.It has low resistance to the current flow when forward biased.

3.It has high resistance to the current flow when reverse biased

4.Its conductivity increases with rise of temperature.

## Question: `The simplest type of rectification known as half wave rectification is obtained by`

1.using a transistor

2.suppressing the harmonics in A.C voltage

3.suppressing half wave of A.C supply by using diode

4.using a Coolidge tube

## Question: `The specially designed semi-conductor diodes used as fast counters in electronic circuits are`

1.The light emitting diodes

2.Photo diodes

3.Photo voltaic cell

4.Solar cells.

1.105 ohm metre

2.106 ohm metre

3.107 ohm metre

4.108 ohm metre

1.constant

2.zero

3.changing

4.infinite

1.protons

2.positrons

3.electrons

4.photons

## Question: `Transformer works on the principle of`

1.Lenzs law

3.Mutual induction

4.Law of conservation of power

## Question: `When the motor is at its maximum speed then back emf will be`

1.Maximum

2.Zero

3.Intermediate values

4.No back emf

## Question: `Which one of following band is completely filled in case of conductors?`

1.Conduction band

2.Fermi band

3.Valence band

4.Forbidden band

1.Galvanometer

2.Ammeter

3.Voltmeter

4.Transformer

1.insulator

2.conductor

3.semi conductor

4.any of above

1.antimony

2.phosphorus

3.aluminium

4.arsenic

## More MCQS

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