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paper of General-Engineering Basic electronics Physics for you

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Paper of Basic electronics in General-Engineering

Course=General-Engineering
Subject=Basic electronics

Question no-1
Electric conduction in a semiconductor takes place due to


Optional Answers

(a)                  Electrones only

(b)                  holes only

(c)                  both electrons and holes

(d)                  neither electrons nor holes

Sollution

Question no-2
When an impurity is doped in a intrinsic semiconductor ,the conductivity of the semiconductor


Optional Answers

(a)                  increases

(b)                  decreases

(c)                  remain the same

(d)                  becomes zero

Sollution

Question no-3
In a normal operation of a transistor


Optional Answers

(a)                  the base-emitter junction is forward -biased

(b)                  the base-collector junction is forward biased

(c)                  the base-emitter junction is reverse biased

(d)                  the-base collector junction is reverse biased

Sollution

Question no-4
An inductor ,a resistor and a capacitor are joined in series with an AC source .as the frequency of the source is slightly increased from a very low value ,the reactance


Optional Answers

(a)                  of the inductor increases

(b)                  of the resistor increases

(c)                  of the capacitor increases

(d)                  of the circuit increases

Sollution

Question no-5
A capacitor act as infinite resistance for


Optional Answers

(a)                  DC

(b)                  AC

(c)                  DC as well as AC

(d)                  neither AC nor DC

Sollution

Question no-6
When the diode show saturated current ,dynamic plate resistance


Optional Answers

(a)                  zero

(b)                  infinity

(c)                  indeterminate

(d)                  different for different diode

Sollution

Question no-7
In a laser tube ,all the photons


Optional Answers

(a)                  have the same wavelength

(b)                  have same energy

(c)                  move in same direction

(d)                  move with same speed

Sollution

Question no-8
When the two photon stimulates the emission of another photon ,the two photon have


Optional Answers

(a)                  same energy

(b)                  same direction

(c)                  same phase

(d)                  same wave length

Sollution

Question no-9
A p type semi-conductor is


Optional Answers

(a)                  positively charged

(b)                  negatively charged

(c)                  uncharged

(d)                  uncharged at 0K but charged at higher temperatures

Sollution

Question no-10
In a transistor,


Optional Answers

(a)                  the emitter has the least concentration of impurity.

(b)                  the collector has the least concentration of impurity.

(c)                  the base has the least concentration of impurity.

(d)                  all the three regions have equal concentration of impurity.

Sollution

Jai guru dev

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