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Semiconductor Electronics · Question 66

AIPMT 2011 (Prelims)MCQEasy📈 Topic in 75% papers+4−1
1

Symbolic representations of four logic gates are shown as [figure] Pick out which ones are for AND, NAND and NOT gates, respectively

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

Answer

(4) (iii), (iv) and (ii)

Solution

(i) Curved input side with a pointed output OR gate.

(ii) Triangle with a small circle (bubble) at the output NOT gate.

(iii) Flat input side with a semicircular output AND gate.

(iv) AND symbol followed by a bubble NAND gate.

AND, NAND and NOT are (iii), (iv) and (ii), respectively.

Answer: (4)

AIPMT 2011 (Prelims)

Keep practising — Semiconductor Electronics

2

If a small amount of antimony is added to germanium crystal

  1. it becomes a p-type semiconductor
  2. the antimony becomes an acceptor atom
  3. there will be more free electrons than holes in the semiconductor
  4. its resistance is increased
AIPMT 2011 (Prelims)
3

A transistor is operated in common emitter configuration at VC = 2 V such that a change in the base current from 100 A to 300 A produces a change in the collector current from 10 mA to 20 mA. The current gain is

  1. 50
  2. 75
  3. 100
  4. 25
Out of syllabusAIPMT 2011 (Prelims)
4

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

  1. NOR gate
  2. OR gate
  3. AND gate
  4. NAND gate
AIPMT 2010 (Mains)
5

For transistor action Which one of the following pairs of statements is correct?

  1. D and A
  2. A and B
  3. B and C
  4. C and D
Out of syllabusAIPMT 2010 (Mains)
6

To get an output Y = 1 in given circuit which of the following input will be correct? [figure]

  1. A 1, B 0, C 0
  2. A 1, B 0, C 1
  3. A 1, B 1, C 0
  4. A 0, B 1, C 0
AIPMT 2010 (Prelims)
7

Which one of the following statements is false?

  1. Pure Si doped with trivalent impurities gives a p-type semiconductor.
  2. Majority carriers in a n-type semiconductor are holes.
  3. Minority carriers in a p-type semiconductor are electrons.
  4. The resistance of intrinsic semiconductor decreases with increase of temperature.
AIPMT 2010 (Prelims)
8

Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?

  1. metallic bonding
  2. van der Waals' bonding
  3. ionic bonding
  4. covalent bonding
AIPMT 2010 (Prelims)
9

The device that can act as a complete electronic circuit is

  1. junction diode
  2. integrated circuit
  3. junction transistor
  4. zener diode
AIPMT 2010 (Prelims)
10

A common emitter amplifier has a voltage gain of 50, an input impedance of 100 and an output impedance of 200 . The power gain of the amplifier is

  1. 500
  2. 1000
  3. 1250
  4. 50
Out of syllabusAIPMT 2010 (Prelims)
11

A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength

  1. 4000 nm
  2. 6000 nm
  3. 4000 A
  4. 6000 A
AIPMT 2009

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