Electronics and Communication Additional Practice Test

12th Standard Physics — Electronics and Communication: Additional Online Practice Test

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At room temperature, what are the forbidden energy gap values for Silicon and Germanium respectively?

A.0.7 eV and 1.1 eV B.1.1 eV and 0.7 eV C.6 eV and 1 eV D.1 eV and 6 eV

Why are semiconductors described as having a negative temperature coefficient of resistance?

A.Resistance increases with temperature B.Resistance decreases as temperature rises C.Resistance remains constant regardless of temperature D.Conductivity decreases as temperature rises

In an intrinsic semiconductor at room temperature, what is the relationship between the number of electrons in the conduction band and holes in the valence band?

A.More electrons than holes B.More holes than electrons C.Equal number of electrons and holes D.No holes are present

Which group of elements is used as dopants to create an n-type extrinsic semiconductor from pure silicon?

A.Group III trivalent elements B.Group V pentavalent elements C.Group IV tetravalent elements D.Noble gases

What is the primary cause for the formation of a depletion region near a p-n junction?

A.Application of forward bias B.Diffusion of majority charge carriers C.Application of reverse bias D.Doping with neutral atoms

By what factor does the reverse saturation current of a silicon diode increase for every 10 degree Celsius rise in temperature?

A.It stays the same B.It is halved C.It doubles D.It triples

What is the theoretical maximum efficiency of a full wave rectifier circuit?

A.40.6 percent B.50 percent C.81.2 percent D.100 percent

In which region of its V-I characteristics is a Zener diode primarily operated for voltage regulation?

A.Forward bias region B.Breakdown region C.Saturation region D.Cut-off region

What physical property of the semiconductor material determines the specific color of light emitted by a Light Emitting Diode (LED)?

A.The size of the diode B.The amount of forward current C.The energy band gap of the material D.The type of casing used

Q10

According to Kirchhoff's law applied to a bipolar junction transistor, how are the emitter (IE), base (IB), and collector (IC) currents related?

A.IB = IE + IC B.IC = IE + IB C.IE = IB + IC D.IE = IB - IC

Q11

When a transistor is used as an amplifier in a common emitter configuration, what is the phase relationship between the input signal and the output signal?

A.They are in phase B.Output lags by 90 degrees C.Output is reversed by 180 degrees D.Output leads by 270 degrees

Q12

Which Barkhausen condition must be satisfied for a transistor circuit to maintain sustained oscillations?

A.Negative feedback must be used B.The loop gain must be unity C.The phase shift must be 90 degrees D.The loop gain must be zero

Q13

In digital electronics, which logic gate produces a high output (1) only when all of its inputs are high?

A.OR gate B.AND gate C.NAND gate D.XOR gate

Q14

According to De Morgan's first theorem, a NOR gate is logically equivalent to which other arrangement?

A.Bubbled OR gate B.Bubbled AND gate C.NAND gate followed by NOT D.XOR gate

Q15

Which mode of electromagnetic wave propagation is typically used for radio frequencies between 3 MHz and 30 MHz by reflecting signals off the ionosphere?

A.Ground wave propagation B.Sky wave propagation C.Space wave propagation D.Satellite communication

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About this Electronics and Communication test

This free online practice test covers Electronics and Communication from the 12th Standard Physics (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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