SINGLE BEAM AND DOUBLE BEAM INSTRUMENTS

Question 1

Which of the following statements is false about single beam absorption instruments?
a) Tungsten bulb is used as a source
b) Beam splitter is used to get parallel beam
c) Test tube is used as sample holder
d) Photovoltaic cell as detector

Answer 1

b) Beam splitter is used to get parallel beam

Question 2

Which of the following statement is false about double beam absorption instruments?
a) It is similar to single beam instruments except two beams are present
b) Tungsten bulb is used as a source
c) Reference beam must have a higher intensity than sample beam
d) Both the beams after they pass through respective samples are compared

Answer 2

c) Reference beam must have a higher intensity than sample beam

Question 3

Which of the following is not an application of colorimeter?
a) Paints
b) Inks
c) Cosmetics
d) Composition detection

Answer 3

d) Composition detection

Question 4

In photometers, the readings of the specimen are initially obtained in the form of which of the following parameters?
a) Transmittance
b) Absorption
c) Wavelengths
d) Volume

Answer 4

a) Transmittance

Question 5

Colorimeters are used in applications where great accuracy is required.
a) True
b) False

Answer 5

b) False

Question 6

Colorimeters are used to determine the concentration of solutions.
a) True
b) False

Answer 6

a) True

Question 7

Which of the following is the purpose of balance indicator in double beam photometer or colorimeter?
a) Selects a particular wavelength
b) Splits the wavelength selected into two equal beams
c) Detects and indicates the amount of light falling on it
d) Indicates the difference between the output of two photometers

Answer 7

d) Indicates the difference between the output of two photometers

Question 8

Which of the following is the purpose of the beam splitter in double beam photometer or colorimeter?
a) Splits beam into two equal intensity beams
b) Splits beam in such a way that sample beam has higher intensity
c) Splits beam in such a way that a reference beam has higher intensity
d) Merge two equal intensity beams into single beam

Answer 8

a) Splits beam into two equal intensity beams

Question 9

Which of the following is a source used in
spectroscopy?
a) LASER
b) Tube light
c) Sodium vapour lamp
d) Tungsten lamp

Answer 9

d) Tungsten lamp