The number of valence electrons in pentavalent impurity is 5 4 3 1 Pentavalent m

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Question
The number of valence electrons in pentavalent impurity is
Options
A. 5
B. 4
C. 3
D. 1

Correct Answer

5

Explanation

Pentavalent means 5 valence electrons.

Materials and Components problems

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1. Assertion (A): Silicon is less sensitive to changes in temperature than germanium.
Reason (R): Cut in voltage in silicon is less than that in germanium.
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

3. If ?_r' and ?_r" are the real and imaginary parts of complex dielectric constant ?_r, and ? is the loss angle. Then
Options
A.
B.
C. tan ? = ?'?"
D. tan ? = 1 - ?'

4. The law J = ?E, where J is current density, ? is electrical conductivity and E is field strength is
Options
A. Ohm's law
B. Gauss law
C. Ampere's law
D. Biot-Savart law

5. Assertion (A): For a solenoid having N turns, .
Reason (R): For all magnetic materials, B increases linearly with I.
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

7. The hysteresis phenomenon in ferromagnetic materials exists at all temperatures.
Options
A. True
B. False

8. In paramagnetic materials
Options
A. permanent magnetic dipoles exist but the interaction between neighbouring dipoles is negligible
B. permanent magnetic dipole do not exist
C. permanent magnetic dipoles exist and the interaction between neighbouring dipoles is very strong
D. permanent magnetic dipole moment may or may not exist

9. The apparent capacitance at a high angular frequency ? of an air cored capacitor having capacitance C and inductance L is given by
Options
A.
B.
C.
D.

10. Ferroelectric materials are those which
Options
A. cannot be polarized
B. have a permanent polarization
C. have a_e equal to zero
D. have ?_p = 0

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