Which gates is represented by this figure 

(a) NAND gate
(b) AND gate
(c) NOT gate
(d) OR gate

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Which of the following logic gate is an universal gate?

1. OR                       

2. NOT

3. AND                     

4. NOR

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In a crystal, the atoms are located at the position of

(a) Maximum potential energy

(b) Minimum potential energy

(c) Zero potential energy

(d) Infinite potential energy

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Types of semiconductors
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The distance between the body centred atom and a corner atom in sodium (a = 4.225 Å) is 
(a) 3.66 Å                         (b) 3.17 Å
(c) 2.99 Å                         (d) 2.54 Å

Concept Questions :-

Types of semiconductors
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In good conductors of electricity, the type of bonding that exists is 
(a) Ionic                     (b) Vander Waals
(c) Covalent                (d) Metallic

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Types of semiconductors
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Bonding in a germanium crystal (semi- conductor) is

(a) Metallic                         (b) Ionic
(c) Vander Waal's type         (d) Covalent

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Types of semiconductors
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The ionic bond is absent in 
(a) NaCl              (b) CsCl
(c) LiF                 (d) H2O

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Types of semiconductors
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A P-type semiconductor can be obtained by adding

(a) Arsenic to pure silicon

(b) Gallium to pure silicon

(c) Antimony to pure germanium

(d) Phosphorous to pure germanium

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Types of semiconductors
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The valence of an impurity added to germanium crystal in order to convert it into a P-type semi conductor is

(a) 6                       (b) 5
(c) 4                       (d) 3

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Types of semiconductors
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In a semiconductor, the concentration of electrons is 8×1014 cm3 and that of the holes is 5×1012 cm3. The semiconductor is

(a) P-type                    (b) N-type
(c) Intrinsic                  (d) PNP-type

Concept Questions :-

Types of semiconductors
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