Multiple choice question for engineering
1. Which of the following is the most sensitive of the spectral methods?
a) Absorption spectroscopy
b) Mass spectroscopy
c) Flame emission spectroscopy
d) Atomic emission spectroscopy
2. Which of the following is the disadvantage of gas chromatography?
a) It is not a good method
b) It cannot be used for qualitative analysis
c) It cannot be used for separation of volatile components
d) It does not provide direct identification
3. Cold tray is provided for liquid N2 or CO2 but is used only for extremely small samples.
4. Which of the following is most often used in the chromatograph in gas chromatograph MS?
b) Paper support
c) Capillary tube
5. GC- MS has been developed for which of the following systems?
a) Packed column
b) Open tubular column
c) Capillary column
d) Porous layer column
6. Which of the following problems occur when combining gas chromatography and mass spectroscopy?
a) Difference in operating pressures
b) Reduction in sensitivity
c) Direct identification is not possible
d) It does not permit direct introduction of the effluent
7. The carrier gas with low molecular weight would diffuse at a higher rate than the higher molecular weight sample.
8. Which of the following is the type of separator used in commercial GC-MS systems?
a) Jet type molecular separator
b) Porous tube
c) Teflon tube
d) Flow type separator
9. The system for measurement of ion intensity in GS-MS system consists of which of the following?
b) Ion meter
c) Ion transducer
d) Intensity meter
10. The system for measurement of ion intensity in GS-MS system consists of which of the following?
a) Band pass amplifier
b) Narrow band amplifier
c) Wide band amplifier
d) Low pass amplifier
1. Which of the following is not the characteristic of a reference electrode?
a) It must have a known output potential
b) It must have a constant output potential
c) Its output potential is dependent on the composition of the solution
d) It is employed in conjunction with the indicator or working electrode
2. Why is Standard hydrogen electrode called as the primary reference electrode?
a) It has a known output potential
b) It has a constant output potential
c) Its output potential is independent of the composition of the solution
d) Its output potential is zero volts
3. Which of the following is the simple and most convenient hydrogen electrode?
a) Pascal Hydrogen electrode
b) Bourne Hydrogen electrode
c) Hilderbant Hydrogen electrode
d) West Hydrogen electrode
4. Which of the following is not the disadvantage of hydrogen electrode?
a) Platinum can be easily poisoned
b) Presence of oxidising agents alters the potential
c) It gives salt error
d) H2 gas at 1 atmospheric pressure is difficult to set up and transport
5. In Hydrogen electrode, the electrode is placed in a solution of ____ M Hcl. Fill in the blank.
6. Hydrogen electrode which is the reference electrode can be used as which of the following?
a) Anode only
b) Cathode only
c) Anode or Cathode
d) Salt bridge
7. If hydrogen electrode acts as cathode, hydrogen is reduced.
8. Given below is a diagram of hydrogen electrode. Identify the unmarked component.
a) Hydrogen at 1 atm
b) Hydrogen at 10 atm
c) Helium at 1 atm
d) Helium at 10 atm
9. The composition of glass membrane in glass electrode cannot have which of the following?
a) Sodium silicate
b) Calcium silicate
c) Lithium silicate
d) Barium silicate
10. Which of the following is the purpose of added membranes in the glass membrane of the glass electrode?
a) They act as tightners
b) They act as filters
c) They act as conditioners
d) They act as collectors
11. Which of the following cannot form the inner reference electrode in glass electrodes?
a) Silver electrode
b) Copper electrode
c) Calomel electrode
d) Silver chloride electrode
12. The pH response of glass electrode is limited entirely to the area of the special glass membrane bulb.
13. Which of the following is not the advantage of glass electrodes?
a) It gives accurate results for high as well as low pH values
b) It is simple to operate
c) It has no salt error
d) Modern electrodes can withstand severe treatment
14. Which of the following is not the disadvantage of glass electrodes?
a) Poor readings are obtained in buffered or unbuffered solutions
b) The electrode must be washed thoroughly with distilled water to obtain proper results
c) Materials suspended on glass should be wiped out neatly to obtain proper results
d) It is affected by oxidation reduction potentials in the solution
15. Given below is the diagram of glass electrode. Identify the unmarked component.
a) Platinum leads
b) Silver wire coated with silver chloride
c) Copper wire
d) Platinum reference electrode
1. In ion spectroscopy, the positive ions are focussed on the sample at which of the following angles?
2. Only those electrons which are in a selected small solid angle are received in the ________ electrostatic analyser.
3. Which of the following can be used as the detector in ion spectroscopy?
a) Faraday cup collector
b) Channel electron multiplier
c) Micro-channel plate
d) Flame ionization detector
4. In order to obtain ISS spectra, the backscattered primary ions are sampled by which of the following?
a) Faraday cup analyser
b) Photographic analyser
c) Micro-channel analyser
d) Cylindrical mirror analyser
5. Which of the following is the energy after collision with a surface atom for a scattering angle of 90o when Eo is the energy of the incident ion, M1 is the mass of the incident ion and M2 is the mass of the target surface?
6. It is advantageous to use ions from a variety of gases.
7. Which of the following gases is not often used in ion spectroscopy?
8. ISS is sensitive to every element heavier than which of the following?
9. Which of the following is the lightest isotope used as a primary ion?
10. The specificity will vary depending on the scattering gas used.
11. ISS is less sensitive than which of the following?
12. Which of the following is the detection limit of ISS for monolayer?
a) 10 -1 %
b) 10 -2 %
c) 10 -3 %
d) 10 -4 %
13. After passing through the pre-filter, ions are passed through which of the following?
a) Quadrupole mass spectrometer
b) Time of flight mass spectrometer
c) Radiofrequency mass spectrometer
d) Magnetic deflection mass spectrometer
14. Which of the following is the range of quadrupole mass spectrometer used in SIMS?
a) 100-200 amu
b) 200-300 amu
c) 500-1000 amu
d) 200-500 amu
15. Which of the following is the resolution of quadrupole mass spectrometer used in SIMS?
a) 1 amu
b) 2 amu
c) 5 amu
d) 3 amu
1. Which of the following is used as detector crystal in ESR spectrometer?
a) Silicon rectifier
b) Silicon tungsten rectifier
c) Silicon boron rectifier
d) Silicon quartz rectifier
2. After detection, the resulting signal will have which of the following frequencies?
a) 1 kHz
b) 10 kHz
c) 100 kHz
d) 1000 kHz
3. Which of the following is the modulation amplitude range of ESR spectrometer?
a) 1mG to 10G
b) 2mG to 15G
c) 3mG to 20G
d) 5mG to 40G
4. In which of the following ranges will the receiver time constant of the ESR spectrometer lie?
a) 0 to 10 s
b) 0.3 to 1 s
c) 0.03 to 10 s
d) 0.003 to 100 s
5. Which of the following is the oscilloscope field width of the ESR spectrometer?
a) 0.2 to 40 G
b) 0.1 to 20 G
c) 0 to 10 G
d) 0.01 to 20 G
6. The magnet used in ESR spectrometer provides a magnetic field which can be varied from ________ to _______
a) 20 mgauss, 100mgauss
b) 200 mgauss, 20kgauss
c) 20 mgauss, 20kgauss
d) 100 mgauss, 10kgauss
7. Which of the following sensor is used in ESR spectrometer?
a) Hall-effect sensor
b) Load cell
c) Strain gauge
d) Bourdon gauge
8. Which of the following oscillator is used as 1230 Hz oscillator?
a) Hartley oscillator
b) Crystal oscillator
c) RC oscillator
d) Wien bridge oscillator
9. What does AFC stand for?
a) Auto frequency correct
b) Automated frequency correct
c) Automatic frequency control
d) Automatic frequency circuit
10. Klystron requires _______ for the klystron beam and up to _____ for the klystron reflector.
a) +400 V, -730 V
b) +650 V, -400 V
c) +200 V,-530 V
d) +180 V,-270 V
11. The klystron body is insulated from ground by an insulating gas casket.
12. The 100 kHz oscillator acts as which of the following?
d) Transmitter and receiver
13. Which of the following removes residual harmonics from the phase-detected signal?
a) High-pass filter
b) Low-pass filter
c) Band-pass filter
14. The oscilloscope is used to display the klystron mode.
15. In the sample cell, which of the following is selected to give maximum optical transmission in the UV-visible region?
1. In X-ray spectrometers, the specimen or the sample is placed after which of the following components?
a) X-ray tube
2. Which of the following components are used to generate X-rays?
a) Meyer tube
b) West tube
c) Anger tube
d) Coolidge tube
3. Using which of the following components is the generated x-rays focussed upon the specimen?
a) X-ray tube
4. The cathode in the Coolidge tube is made of which of the following elements?
5. The cathode in the Coolidge tube is kept in an inclined manner.
6. Which of the following is not a target metal used in Coolidge tube?
7. How can the resolution of the collimator be increased?
a) By reducing the separation between the metal plates of the collimator
b) By increasing the separation between the metal plates of the collimator
c) By increasing the number of metal plates
d) By decreasing the number of metal plates
8. When x-rays emitted from molybdenum are allowed to pass through a zirconium filter, which of the following occurs?
a) It absorbs radiation of shorter wavelength
b) It absorbs radiation of longer wavelength
c) It allows radiation of shorter wavelength to pass through
d) It allows radiation in a particular band to pass through
9. When compared to filters, monochromators provide much signal to noise ratio.
10. Which of the following crystals are not suited for x-ray grating?
b) Lithium fluoride
c) Calcium fluoride
d) Sodium fluoride
11. Given below is the block diagram of X-ray spectrometer. Identify the unmarked component.
12. The x-rays generated come out of the Coolidge tube through which of the following?
a) Beryllium window
b) Tungsten window
d) Target material