NEW
Font size
WorksheetsIMA SUBJECT
Total questions: 22
Worksheet time: 11mins
Which radiation source has electrode in its construction ?
Tungsten lamp
Hydrogen discharge lamp
Xenon Discharge Lamp
Mercury lamp
Which device is used to isolate the radiation of the desired wavelength from wavelength of the continuous spectra ?
Monochromator
Radiation source
Detector
Recorder
Diffraction grating is consists of a
Glass
Quartz
Alkyl halide
All of the above
The work of Entrance slit is?
To get narrow source
To render light parallel
To disperse radiation
To fall on sample cell
Collimator is used for?
To reform the image of the entrance slit.
To get narrow source
To fall on sample cell
To disperse radiation
Exit slit used for
To reform the image of the entrance slit.
To get narrow source
To fall on sample cell
None of these
Which type of vapour is stored in Mercury lamp ?
Mercury vapour
Hydrogen vapour
Xenon vapour
Ozone
A device which converts electrical energy in the form of a current into optical energy is called as ___________
Optical source
Optical coupler
Optical isolator
Circulator
How many types of sources of optical light are available?
1
2
3
4
The frequency of the absorbed or emitted radiation is related to difference in energy E between the higher energy state E2 and the lower energy state E1. State what h stands for in the given equation?
E = E2 - E1 = hf
Gravitation constant
Planck’s constant
Boltzmann constant
None of these
Which is the missing block in the block diagram for Absorption of Radiation Instrument given below?
Radiation source------wavelength selector-----sample------?------readout
Filter
Amplifier
Deatector
Monochromator
How is Tungsten Halogen lamp differs from normal Tungsten filament lamp used in absorption spectroscopy?
It has a tungsten filament and is filled with inert gas
Iodine is added to normal filling gas
Iodine is coated on tungsten filament
Iodine is added to inert gas
How does continuous wedge filter differ from normal interference filter used in absorption spectroscopy?
It permits continuous selection of different wavelength
It allows a narrow band of wavelengths to pass
It has two semi-transparent layers of silver
Space layer is made of a substance having low refractive index
Which of the following could be used as the layer of dielectric in interference filters used in Absorption Spectroscopy?
Graphite
Magnesium flouride
Iron
Silver nitrate
How can stability of radiation be achieved in incandescent or discharge source used in Absorption Spectroscopy?
Using filters
Using monochromators
Using slits
By controlling the source voltage
To tolerate high operating temperatures, which of the following has to be done in incandescent or tungsten filament lamps?
Alloys must be used
Nitrogen be used instead of inert gas
Envelope is fabricated with quartz
Envelope is fabricated with copper
Which of the following is not a reason for laser not being generally used as a source of radiation for UV, Visible Spectroscopy?
High cost
Limited range of wavelength
Less intensity
Complex to work with
An electronic device that amplifies the electrical signal from the transducer is
Signal processor
Detector
Readout
Amplifier
Thermocouples are also called as
Junction thermometers
Resistance thermometers
Photon transducers
All of the above
Type of filter could be used for emission or fluorescence
Cut-off filter
Detector
Monochromatic beam
Monochromators
Photodiode array are simply linear arrays of __________, each consists of a reverese-biased pn junction.
Silicon diodes
pn diode
Silicon photodiode
n-doped silicon
Bolometers are also called as
resistance thermometers
Junction thermometers
Thermal transducers
Thermocouples
