Electronics MCQs Question and Answer in Engineering Physics

1

The circuit shown above

A) is a common-emitter amplifier B) uses a p-n-p transistor C) is an oscillator D) has a voltage gain less than one

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Answer & Solution

Answer: Option A

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2

The Boolean expression $$B\left( {A + B} \right) + A\left( {\overline B + A} \right)$$ can be realized using minimum number of

A) 1 AND gate B) 2 AND gates C) 1 OR gate D) 2 OR gates

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Answer & Solution

Answer: Option C

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3

An amplifier of gain 1000 is made into a feedback amplifier by feeding 9.9% of its output voltage in series with the input opposing. If f_L = 20 Hz and f_H = 200 kHz for the amplifier without feedback, then due to the feedback

A) the gain decreases by 10 times B) the output resistance increases by 10 times C) the f_H increases by 100 times D) the input resistance decreases by 100 times

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Answer & Solution

Answer: Option C

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4

The following circuit (where, R_L ≫ R) performs the operation of
Electronics mcq question image

A) OR gate for a negative logic system B) NAND gate for a negative logic system C) AND gate for a positive logic system D) AND gate for a negative logic system

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Answer & Solution

Answer: Option A

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5

In the circuit shown, the ports Q₁ and Q₂ are in the states Q₁ = 1, Q₂ = 0. The circuit is now subjected to two complete clock pulses. The state of these ports now becomes
Electronics mcq question image

A) Q₂ = 1, Q₁ = 0 B) Q₂ = 0, Q₁ = 1 C) Q₂ = 1, Q₁ = 1 D) Q₂ = 0, Q₁ = 0

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Answer & Solution

Answer: Option C

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6

For the circuit shown below, the potential difference (in volt) across R_L is
Electronics mcq question image

A) 48 B) 52 C) 56 D) 65

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Answer & Solution

Answer: Option B

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7

An AC voltage of 220 V(rms) is applied to the primary of a 10 : 1 step-down transformer. The secondary of the transformer is centre tapped and connected to a full-wave rectifier with a load resistance. The DC voltage appearing the load is

A) $$\frac{{22}}{\pi }$$ B) $$\frac{{31}}{\pi }$$ C) $$\frac{{62}}{\pi }$$ D) $$\frac{{44}}{\pi }$$

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Answer & Solution

Answer: Option D

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8

The circuit shown in the figure below function as
Electronics mcq question image

A) an OR gate B) an AND gate C) a NOR gate D) a NAND gate

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Answer & Solution

Answer: Option A

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9

A bistable multivibrator with a saturation voltage ±5 V is shown in the diagram. The positive and negative thresholds at the inverting terminal for which the multivibrator will switch to the other state, are
Electronics mcq question image

A) ±5/11 V B) ±10/11 V C) ±5 V D) ±11 V

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Answer & Solution

Answer: Option A

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10

Which of the given relations between the Boolean variables P and Q are not correct? (In the notation used here, P' denotes not P and Q' denotes not Q)

A) PQ' + PQ = P B) (PQ)' = P' + Q' C) PQ' = (P' + Q)' D) PQ' + Q = P

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Answer & Solution

Answer: Option D

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