Question is ⇒ The merger of hole and free electron is called, Options are ⇒ (A) covalent bonding, (B) recombination, (C) thermal energy, (D) free electrons, (E) , Leave your comments or Download question paper.

Question is ⇒ The merger of hole and free electron is called, Options are ⇒ (A) covalent bonding, (B) recombination, (C) thermal energy, (D) free electrons, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	The merger of hole and free electron is called
A.	covalent bonding [Wrong Answer]
B.	recombination [Correct Answer]
C.	thermal energy [Wrong Answer]
D.	free electrons [Wrong Answer]
View Answer 1 -2 Explanation:- Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ Which configuration has high input impedance and low output impedance?
CB
CE
CC
CB and CE

⇒ Wagner earthing device is used to eliminate error due to
electromagnetic coupling
electrostatic coupling
both electrostatic and electromagnetic coupling
either (a) or (b)

⇒ A step up chopper can give an output voltage
higher than input voltage
lower than input voltage
both higher and lower input voltage
all of the above

⇒ The circuit of figure is used to measure the value R_x. Ammeter resistance R_a = 0.1 Ω voltmeter resistance R_v = 5000 Ω. It R_x1 and R_x2, are the measured values of R_x with switch in position 1 and 2, the mean of R_x1, and R_x2,
9.98 Ω
10 Ω
10.04 Ω
10.1 Ω

⇒ Consider the following statements

Tellegen's theorem is applicable to any lumped network.
Reciprocity theorem is applicable to linear bilateral network.
Thevenin theorem is applicable to two terminal linear active network.
Norton's theorem is applicable to linear active network.

Which of the above statements are correct?
1, 2 and 3
1, 2, 3 and 4
1, 2 and 4
3 and 4

⇒ The elements which become superconducting at extremely low temperatures are
good conductors at room temperature
ferromagnetic at room temperature
relatively poor conductors at room temperature
insulators at room temperature

⇒ Measurement of an unknown voltage with a dc potentiometer loses its advantage of open circuit measurement when
the primary circuit battery is changed
standardization has to be done again to compensate for drifts
voltage is larger than range of the potentiometer
range reduction by a factor of 10 is employed

⇒ For a symmetrical network
h₁₁ = h₂₂
h₁₂ = h₂₁
h₁₁ h₂₂ - h₁₂ h₂₁ = 0
h₁₁ h₂₂ - h₁₂ h₂₁ = 1

⇒

Assertion (A): PIN diode is used as a fast switch.

Reason (R): PIN diode has very high resistance when reverse biased and very low resistance when forward biased.

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

⇒ Which of following antenna does not depend upon the frequency?
Log-periodic
Parabolic
Conical
All of the above

⇒ Aperture circuit produces __________ in sample hold circuit.
the total sampling time
delay between the instance at which hold command is initiated and the instance at which O/P starts tracking I/P
the time taken by O/P to settle within the specified 1% error band, that of the I/P
time required by holding capacitor to reach upto the level close to input

⇒ Consider the equation s² + 2s + 2 + K(s + 2) = 0. Where do the roots of this equation break on the root loci plot?
-3.414
-2.414
-1.414
-0.414

⇒ The forbidden energy gap for germanium is
0.12 eV
0.32 eV
0.72 eV
0.92 eV

⇒ Serial input data of 8085 can be loaded into bit-7 of the accumulator by
executing a RIM instruction
executing RSTI
using TRAP
none of the above

⇒ If f(t) is an even function, the coefficients F_n in the exponential form of Fourier series
are real
are imaginary
are complex
may be real or imaginary

⇒ The terminals of a power BJT are called
emitter, base, collector
emitter, base, drain
source, base, drain
source, base, collector

⇒ DeMorgan's first theorem is =
A . A = 0
A = A
A + B = A . B
AB = A + B

⇒ In a JK master slave flip flop race condition does not occur.
TRUE
FALSE

⇒ Addition of a small amount of antimony to germanium will result in
formation of p-type semiconductor
more free electrons than holes in semiconductor
antimony concentrating on the edges of the crystal
increased resistance

⇒

Match the following:

	List I		List II
A.	Very low response at very high frequencies	1.	Low-pass system
B.	Over shoot	2.	Velocity damping
C.	Synchro-control transformer output	3.	Natural frequency
		4.	Phase-sensitive modulation
		5.	Damping ratio

A-1, B-5, C-4
A-3, B-2, C-4
A-2, B-5, C-4
A-4, B-1, C-3

⇒

Assertion (A): Germanium is more commonly used than silicon.

Reason (R): Forbidden gap in germanium is less than that in silicon.

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

⇒ The simplified logic expression for the circuit of the given figur
Y = A
Y = AB
Y = A + B
Y + A + B

⇒ Two coils having equal resistance but different inductances are connected in series. The time constant of the series combination is
average of the time constants of individual coils
sum of the time constants of the individual coils
geometric mean of the time constants of individual coils
product of the time constants of the individual coils

⇒ Thermistor is used in
temperature measurement
temperature control
high temperature alarm circuits of devices
all of the above

⇒ Consider the following program for 8085 Adds decimal number 5 to contents of memory
Subtracts decimal number 5 from contents of memory
Subtracts decimal number 15 from contents of memory
Adds decimal number 15 to contents of memory

⇒ Thyristors can be used for control of
dc separately excited motor
dc shunt motor
dc series motor
all of the above

⇒ For a paramagnetic material, susceptiblity increases with increasing temperature.
TRUE
FALSE

⇒

Match the following:

	List I (type of controller)		List II (Operation)
A.	Pneumatic controller	1.	Flexible operation
B.	Hydraulic controller	2.	High torque high speed operation
C.	Electronic controller	3.	Fire and explosion proof operation

A-1, B-3, C-2
A-1, B-2, C-3
A-3, B-1, C-2
A-3, B-2, C-1

⇒ In a JFET avalanche breakdown occurs when V_DS = 22 V and V_GS = 0. If V_GS = -1 V, the avalanche breakdown will occur at
V_DS = 22 V
V_DS more than 22 V
V_DS equal to or more than 22 V
V_DS less than 22 V

⇒ The circuit in figur
rectifier
voltage to frequency converter
frequency to voltage converter
logarithmic amplifier