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Semiconductor Electronics · Question 73

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 0% papers+4−1
1

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

Answer

(1) metallic bonding

Solution

Lustre (reflection of visible light) is due to free electrons of a metal.

⇒ In a metal, conductivity decreases with rise in temperature (more collisions of free electrons with vibrating kernels).

⇒ Strong metallic bonds give a high melting point.

∴ All three properties point to metallic bonding.

Answer: (1)

AIPMT 2010 (Prelims)

Keep practising — Semiconductor Electronics

2

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)
3

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)
4

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
5

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)
AIPMT 2009
6

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
7

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
8

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
9

Which one of the following represents forward bias diode?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2007
10

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
11

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

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