406. An intrinsic semiconductor at the absolute zero temperature—

1. 1. Behaves like an insulator

   
   
   

   2. Has a large number of holes

   
   
   

   3. Has a few holes and same number of electrons

   
   
   

   4. Behaves like a metallic conductor

   
   
   

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   NA

   Correct Option: A

   NA

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407. An electron in the conduction band—

1. 1. Is bound to its parent atom

   
   
   

   2. Is located near the top of the crystal

   
   
   

   3. Has no charge

   
   
   

   4. Has a higher energy than an electron in the valence band

   
   
   

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   An electron in the conduction band has a higher energy than an electron in the valence band.

   Correct Option: D

   An electron in the conduction band has a higher energy than an electron in the valence band.

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408. A germanium atom contains—

1. 1. Four protons

   
   
   

   2. Only two electron orbits

   
   
   

   3. Four valence electrons

   
   
   

   4. Five valence electrons

   
   
   

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   Every germanium atom has four valence electrons.

   Correct Option: C

   Every germanium atom has four valence electrons.

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409. When atom are held together by the sharing of valence electrons—

1. 1. They form a covalent bond

   
   
   

   2. The valence electrons are free to move away from the atom

   
   
   

   3. Each atom becomes free to move

   
   
   

   4. Each shared electron leaves a hole

   
   
   

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   When atom are held together by the sharing of valence electrons they form a covalent bond.

   Correct Option: A

   When atom are held together by the sharing of valence electrons they form a covalent bond.

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410. Among the three configuration the lowest input impedance is obtained by—

1. 1. CE

   
   
   

   2. CC

   
   
   

   3. CB

   
   
   

   4. both CB and CC

   
   
   

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   NA

   Correct Option: C

   NA

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