At room temperature the number of conducting electrons in an intrinsic semicondu

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Question
At room temperature the number of conducting electrons in an intrinsic semiconductor
Options
A. is almost equal to the number of valence electrons
B. is about half the number of valence electrons
C. is small as compared to the number of valence electrons
D. is a very small fraction of the number of valence electrons

Correct Answer

is a very small fraction of the number of valence electrons

Materials and Components problems

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2. Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called
Options
A. Debye temperature
B. Curie temperature
C. Neel temperature
D. Transition temperature

4. In solid insulator materials having only one kind of atom, the types of polarization which exist are
Options
A. electronic only
B. electronic and ionic
C. electronic, ionic and permanent
D. electronic and permanent

5. Assertion (A): The angular momentum of an atom is due to three contributions viz. orbital, electron spin and nuclear spin.
Reason (R): The nuclear spin magnetic moment is much more than electron spin magnetic moment.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

6. As the viscosity of a liquid increases, the relaxation time
Options
A. remains constant
B. increases
C. decreases
D. first decreases then increases

9. If the radius of electron cloud around the nucleus of a rare gas atom is R, the electronic polarizability of the atom is porportional to
Options
A. R
B. R²
C. R³
D.

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