Question # 1

In which of the following diodes when an electron combines with a hole during the forward biasing, photon of visible light is emitted.

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photo diode

light emitting diode

photo voltaic cell

all of them

If the value of C in a series RLC circuit is increased, the resonant frequency

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Is not affected

Increase

Remains the same

Decreases

For normal operation of transistor, the batteries

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V_CCis of much lower value than V_BB

V_CCis of much higher value than V_BB

V_{CC is equal to}V_BB

none of these

Mathematical manipulation of the two quantized states can be best carried if they are represented by

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high - low

yes - no

on - off

0 - 1

The total reactance of a series RLC circuit at resonance is

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zero

Equal to the resistance

Infinity

Capacitive

In half wave rectification

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both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

The value of current gain of n-p-n transistor is of the order of

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tens

hundreds

thousands

ten thousands

Which of the following diode is used to derive the current in external circuit when light is incident in the circuit

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photo diode

light emitting diode

photo voltaic cell

none of these

A signal is amplified at the output without any change of phase, if it is applied at the

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inverting input

non-inverting input

at any of the input

none of these

Peak value of alternative current is:

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one of its Instantaneous value

Equal to its RMS value

The same as its peak-to-peak value

Both (B) and (C)

None of these

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

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2nd group

fourth group

fifth group

sixth group

The magnitude of alternative voltage V:

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Always increase

Always decrease

Remains constant

Does not remain constant

None of these

In RLC series circuit, resonance occurs when

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X_{L > Xc}

X_{L < Xc}

X_{L = Xc}

None of these

Which one of the following is correct?

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V_o= 1.414 V_rms

I_ams= 1.414 I_o

VO = 10.70 Vrms

Both a and b

The Instantaneous value of alternative current maybe:

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The same as its RMS value

Greater than its Rms value

The same as its peak value

Any of these

None of these

The wave form of alternating voltage is the graph between:

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Voltage across X-axis and time across y-axis

Current and time

Voltage along y-axis and time along x-axis

Voltage and current

Either (B) or (D)

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