Even at room temperature, an intrinsic semiconductor has some holes. These holes

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Question
Even at room temperature, an intrinsic semiconductor has some holes. These holes are due to
Options
A. electron
B. doping
C. thermal energy
D. free electrons

Correct Answer

thermal energy

Materials and Components problems

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1. An electron is moving in a circular orbit of radius R at angular velocity ?₀ in a field free space. If a magnetic field B is created, the velocity of electron ? will be given by the equation
Options
A.
B.
C.
D.

2. As regards ?₀ and ?_r (absolute and relative permittivity)
Options
A. both ?₀ and ?_r can be interpreted in terms of atomic properties of medium
B. only ?_r can be interpreted in terms of atomic properties of medium
C. only ?₀ can be interpreted in terms of atomic properties
D. ?_r has no physical significance

4. Assertion (A): For most metals, Fermi energy E_F is less than 10 eV.
Reason (R): Fermi level of a metal is given by E_F = 3.64 x 10^-19 (n)^2/3 where n is number of free electrons/m³ of metal.
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. At a very low temperature, a semiconductor
Options
A. becomes a conductor
B. becomes an insulator
C. may become a conductor or an insulator
D. will remain a semiconductor becomes a conductor or an insulator

7. Assertion (A): Helium, Argon and Neon are gaseous at room temperature.
Reason (R): The atoms in Helium, Argon and Neon are chemically extremely inactive.
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

9. The transition of electron from energy level W₁ to W₂ is associated with emission or absorption of electro magnetic radiation of frequency f such that
Options
A. hf = |W₁ - W₂|
B. |W₁ - W₂|f = h
C. hf = 0.5|W₁ - W₂|
D. (hf)² = |W₁ - W₂|

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