Assertion (A): If E is available energy state eV and EF is Fermi level, then pro

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Question
Assertion (A): If E is available energy state eV and E_F is Fermi level, then probability of energy state E being occupied = 0.5.
Reason (R): .
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

Correct Answer

Both A and R are true but R is not correct explanation of A

Explanation

E = E_F, f(E) = 0.5.

Materials and Components problems

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2. In a true valence crystal, the bonding between the atoms is accomplished by the sharing of valence electrons.
Options
A. True
B. False

3. Which element exhibits the property of inertia?
Options
A. Resistance
B. Capacitance
C. Inductance
D. Both resistance and inductance

4. Assertion (A): Magnetic susceptibility of diamagnetic materials is much less than that of paramagnetic materials.
Reason (R): For diamagnetic as well as paramagnetic materials, ?_r is nearly equal to 1.
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

5. If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then
Options
A. the majority carrier density is doubled
B. the minority carrier density is doubled
C. the minority carrier density becomes 4 times the original value
D. both the majority and minority carrier densities double

6. Two materials having temperature coefficients of 0.004 and 0.0004 respectively are joined in series. The overall temperature coefficient is likely to be
Options
A. 0.08
B. 0.04
C. 0.001
D. 0.0001

7. If the diameter of a wire is doubled, its current carrying capacity becomes
Options
A. one-fourth
B. half
C. twice
D. four times

8. The time constant of the circuit in figure shown.
Options
A. RC
B.
C.
D.

10. A current is flowing through a conductor with non-uniform area of cross-section. Then
Options
A. current will be different at different cross-sections.
B. current will be the same at all the cross-sections.
C. current will be different but current density will be same at all the cross-sections
D. current will be the same but current density will be different at different cross-sections.

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