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Semiconductor Electronics · Question 77

AIPMT 2009MCQEasy📈 Topic in 75% papers+4−1
1

The symbolic representation of four logic gates are given below [figure] The logic symbols for OR, NOT and NAND gates are respectively

  1. (iv), (i), (iii)
  2. (iv), (ii), (i)
  3. (i), (iii), (iv)
  4. (iii), (iv), (ii)

Answer

(2) (iv), (ii), (i)

Solution

(i) AND shape with a bubble at the output NAND gate

(ii) Triangle with a bubble NOT gate

(iii) AND shape without bubble AND gate

(iv) Curved (shield) shape OR gate

OR, NOT and NAND are (iv), (ii) and (i) respectively.

Answer: (2)

AIPMT 2009

Keep practising — Semiconductor Electronics

2

A transistor is operated in common-emitter configuration at VC = 2 V such that a change in the base current from 100 to 200 produces a change in the collector current from 5 mA to 10 mA. The current gain is

  1. 100
  2. 150
  3. 50
  4. 75
Out of syllabusAIPMT 2009
3

A p-n photodiode is made of a material with a band gap of 2.0 eV. The minimum frequency of the radiation that can be absorbed by the material is nearly

  1. 1 1014 Hz
  2. 20 1014 Hz
  3. 10 1014 Hz
  4. 5 1014 Hz
AIPMT 2008
4

The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be

  1. 1.25
  2. 100
  3. 90
  4. 10
Out of syllabusAIPMT 2008
5

Which one of the following represents forward bias diode?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2007
6

In the following circuit, the output Y for all possible inputs A and B is expressed by the truth table. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2007
7

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is [figure]

  1. an insulator
  2. a metal
  3. an n-type semiconductor
  4. a p-type semiconductor
AIPMT 2007
8

The following figure shows a logic gate circuit with two inputs A and B and the output C. [figure] The voltage waveforms of A, B and C are as shown below. [figure] The logic circuit gate is

  1. OR gate
  2. AND gate
  3. NAND gate
  4. NOR gate
AIPMT 2006
9

Which one of the following represents forward bias diode ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2006
10

A transistor is operated in common emitter configuration at constant collector voltage VC = 1.5 V such that a change in the base current from 100 to 150 produces a change in the collector current from 5 mA to 10 mA. The current gain is

  1. 50
  2. 67
  3. 75
  4. 100
Out of syllabusAIPMT 2006
11

Choose the only false statement from the following.

  1. In conductors the valence and conduction bands overlap.
  2. Substances with energy gap of the order of 10 eV are insulators.
  3. The resistivity of a semiconductor increases with increase in temperature.
  4. The conductivity of a semiconductor increases with increase in temperature.
AIPMT 2005

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