Analytical Instruments Quiz

AI Quiz – 1

Q 1: Which statement is wrong about qualitative analysis

A) It is used for the identification of different kinds of substance present in a sample
B) No. is required
C) No. is not required
D) It can be identified by color, indicators, boiling point, odors etc.

Show Answer

Q 2: In a solution, a solvent is 

A) present in small proportion
B) not gases, liquids or solids
C) get dissolved in the solution
D) None of these

Show Answer

Q 3: Which statement is false about the Internal standard method?

A) It is generally used for the calibration of liquid chromatography
B) In this method, a substance is added in constant amount to all samples
C) The calibration uses the ratio of response between the analyte and the IS.
D) None of these

Show Answer

Q 4: The signal-to-noise ratio (S/N) in a single scan is 20. How many scans are necessary to get a ratio (S/N) of 40? 

A) 2
B) 4
C) 6
D) 8

Show Answer

Q 5: With the increase of wavenumber, 

A) energy of photon increases
B) frequency increases
C) wavelength decreases
D) all of above

Show Answer

Q 6: Identify the correct sequence that corresponds to A, B, and C in the given figure. Where the red line & circle represents the radiation path & matter respectively. 

A) Absorption, Diffraction, Scattering
B) Diffraction, Absorption, Scattering
C) Scattering, Absorption, Diffraction
D) None of these

Show Answer

Q 7: Double bond contains

A) two sigma bond
B) two pi bond
C) one sigma & one pi bond
D) None of these

Show Answer

Q 8: If % Transmittance equals 10, absorbance equals

A) 1
B) 2
C) 3
D) 4

Show Answer

Q 9: The figure depicts the thermal decomposition of several polymers. The polymer with the lowest thermal stability is

A) PVC
B) PE
C) PTFE
D) All of above

Show Answer

Q 10: Which statement is true about Thermogravimetry Analysis (TGA)

A) solid, liquid and gas samples can be analyzed
B) It can not be used for a material which undergoes mass change with temperature
C) It can study process like melting, glass transition temperature etc.
D) None of these

Show Answer

Q 11: Which one is true about Power Compensated DSC

A) it measures heat flow
B) separate heaters are used for both sample and reference
C) single heater is used
D) A & B
E) B & C

Show Answer

Q 12: A 100 % crystalline polymer 

A) can have glass transition temperature
B) can not have glass transition temperature
C) can have both glass transition & melting temperature
D) None of these

Show Answer

Q 13: Which types of compounds are suitable for gas chromatography analysis? 

A) volatile & thermally stable
B) non-volatile
C) inorganic metals
D) All of above

Show Answer

Q 14: What should the carrier gas characteristics be?

A) It should not react with the sample.
B) The contribution of carrier gas should be minimum to the partitioning process.
C) It should be highly pure
D) All of above

Show Answer

Q 15: In gas chromatography, during split-injection mode only  ______________

A) 5 % of injected sample enters column
B) 25 % of injected sample enters column
C) 55 % of injected sample enters column
D) 95 % of injected sample enters column

Show Answer

Q 16: Which of the following statements concerning capillary columns is true when employed in gas chromatography?

A) it produces broad peaks
B) it produces sharper peaks
C) it produces shorter peaks
D) None of these

Show Answer

Q 17: What are the characteristics of a good detector?

A) It should have high sensitivity & good reproducibility.
B) It should be inexpensive and non-destructive.
C) It should not be affected by change in temperature and mobile flow rate.
D) All of above

Show Answer

Q 18: Which statement is false about HPLC

A) vaporization of sample is not required
B) vaporization of sample is required
C) used for non-volatile compounds
D) None of these

Show Answer

Q 19: In reverse phase column ___________

A) stationary phase is more polar while mobile phase is less polar
B) stationary phase is less polar while mobile phase is more polar
C) both stationary and mobile phases are more polar
D) both stationary and mobile phases are less polar

Show Answer

Q 20: Why silica is used as a stationary phase in HPLC?

A) it is inert material
B) It doesn’t react with mobile phase
C) It has different length & porosity
D) All of above
E) None of these

Show Answer