Physics Group - I (3110011) MCQs

MCQs of Lasers

Showing 31 to 39 out of 39 Questions
1 2 3 4
31.
The wavelength absorbed by the Cr 3+ ions ions during pumping is
(a) is wasted
(b) heats up the system
(c) both a and b
(d) cools the system
Answer:

Option (c)

32.
The active medium of a helium- neon laser is made up of __________ ratio of helium and neon.
(a) 5 : 8
(b) 3 : 7
(c) 2 : 9
(d) 10 : 1
Answer:

Option (d)

33.
In a helium-neon laser, helium is used to decrease the __________ in the lower levels
(a) Active medium
(b) Energy state
(c) Population
(d) time interval
Answer:

Option (c)

34.
Resonating cavity is also called
(a) Fully reflecting surface
(b) Partial reflecting surface
(c) 2 reflecting surfaces
(d) Optical resonator
Answer:

Option (d)

35.
Gas lasers are highly used in industries due to
(a) high monochromaticity
(b) stable frequency
(c) wavelength tuning as per requirement
(d) all of these
Answer:

Option (d)

36.
The end faces of discharge tube of He-Ne laser system are tilted at Brewster angle
(a) True
(b) False
(c) Can't say
(d) not necessary
Answer:

Option (a)

37.
Metastable state is one where the atom resides for
(a) very less time
(b) more time as in excited state
(c) infinite time
(d) less time as in excited state
Answer:

Option (b)

38.
The colour of light is determined by its
(a) source
(b) intensity
(c) wavelength
(d) propagation
Answer:

Option (c)

39.
A laser beam has intensity that can be used to cut
(a) rough patches
(b) Precision cutting
(c) Only soft materials
(d) all of these
Answer:

Option (b)

Showing 31 to 39 out of 39 Questions
1 2 3 4