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Q.1
The p-type semiconductor is obtained by doping the intrinsic semiconductor with
pentavalent impurities
bivalent impurities
trivalent impurities
any impurity atoms
Q.2
How is population inversion achieved in Carbon dioxide laser?
optical pumping
by electrical discharge
chemical pumping
none of the above
Q.3
The concept of matter wave was suggested by_________
Heisenberg
Louis de Broglie
Schrodinger
Einstein
Q.4
At 0 kelvin, all the energy levels below fermi level are
Completely empty
Completely filled
Partially filled
Half filled
Q.5
Which is NOT a characteristic of a LASER?
High intensity
unidirectional
White light
Coherent
Q.6
Which of the following equation represents Simple Harmonic motion?
y=mx+c
x= a sin wt
y = Aebt
x= a (wt)
Q.7
At resonance,
the natural frequency becomes equal to applied force frequency
The amplitude becomes maximum
damping becomes minimum
all the three options
Q.8
Laser is a monochromatic source of light. This means all the light waves have...
same wavelength
same phase
same intensity
same direction
Q.9
In spontaneous emission the incident and emitted waves are...
similar
different
amplified
coherent
Q.10
The resonator consists of ... mirrors at least.
2
3
4
5
Q.11
The first laser was built in...
1920
1940
1960
1980
Q.12
The process in which the electrons in the ground state are vibrated to the excited states by providing extra energy from energy sources is called as
Population Inversion
Spontaneous emission
Stimulated emission
Pumping
Q.13
In He-Ne laser active energy levels for transitions are provided by
Ne atoms
He atoms
Both He and Ne
Co2 atoms
Q.14
We get continuous laser from
Ruby
Diode
He-Ne
Co2
Q.15
We get pulse laser from
Ruby rod
He, Ne laser 10:1 ratio
CO2 laser
Diode laser
Q.16
In Physics lab the laser we use is
He-Ne laser
Ruby laser
Diode laser
Co2 laser
Q.17
Which of the following statements are true?LASER is used as optical source in single mode fibers.LASER lights are highly incoherent.
1. is true and 2. is false
1. is false and 2. is true
Both 1 & 2 are true
Both 1 & 2 are false
Q.18
The coherent nature of light from LASER is due to
Spontaneous emission
Stimulated Emission
Absorption
Pumping
Q.19
Light amplification in LASER is achieved by
Population inversion
Stimulated emission
Spontaneous emission
Pumping
Q.20
Minimum number of energy states required to achieve population inversion is
1
2
3
4
0 h : 0 m : 1 s
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