MCQs - Mass Spectroscopy -AIT-bpharm_sem8

MCQS ON MASS SPECTROSCOPY

1. In mass spectrometry 81Br shows:

(a) M+1 peak 

(b) M+2 peak

(c) M+3 peak 

(d) M+4 peak

2. Klystron is used as radiation source in

(a) X-ray diffraction

(b) Electron spin resonance

(c) Mass spectrometry

(d) None of above

3. In mass spectra, the most intense peak is the

(a) Base peak

(b) Metastable ion peak

(c) Fragment ion peak

(d) Rearrangement ion peak

4. Which of following ionization technique is used in molecular weight determination of large biomolecule by using mass?

(a) Electron impact 

(b) Chemical ionization

(c) MALDI 

(d) None of the above

5. A mass spectrometer bombards molecules with a high energy electron beam in

(a) Colloidal Phase 

(b) Liquid Phase

(c) Solid State 

(d) Vapour Phase

6. The inert gas used in the ionization stage of mass spec trometry is

(a) Helium 

(b) rgon

(c) Xenon 

(d) Methane

7. The correct order for the basic features of a mass spectrometer is _____________

(a) Acceleration, deflection, detection, ionization

(b) Ionisation, acceleration, deflection, detection

(c) Acceleration, ionisation, deflection, detection

(d) Acceleration, deflection, ionisation, detection

8. Principal involved in mass spectrometer is

(a) Excitation of electron

(b) Electron impact bombardment

(c) Molecular vibration

(d) Splitting of electrons magnetic energy

9. A mixture of the following gases can be used in flame photometry to get a temperature of 3125°C:

(a) Hydrogen and nitrous oxide

(b) Acetylene and oxygen

(c) Hydrogen and air

(d) Hydrogen and oxygen

10. In mass spectroscopy positively charged ions can be produced by

(P) Heating the sample

(Q)Bombarding the sample with high energy electrons

(R) Bombarding the sample with high energy protons

(S) Chemical oonization

(a) Q, S 

(b) Q, R

(c) P, R 

(d) P, S

11. In mass spectrum M-18 peak indicates loss of

(a) Hydroxyl group 

(b) Hydrogen

(c) Methyl group 

(d) Water molecule

12. In mass spectrum of yoluene, widely the meta stable peak appear at

(a) 91 m/e 

(b) 77 m/e

(c) 46.6 m/e 

(d) 64.5 m/e

13. Metastable peaks have following all characteristics except

(a) These peaks are much broader that is they spread over mass units

(b) These peaks are of high intensity

(c) These peaks appear in the mass spectrum usually at non-integral m/e value

(d) The meta stable ions can be detected by a double focusing mass spectrometer

14. Removal of a single electron from a molecule results in the formation of

(a) Fragment ion 

(b) Metastable ion

(c) Molecular ion 

(d) Rearrangement ion

1. (b) 2. (c) 3. (a) 4. (c) 5. (d) 6. (d) 

7. (b) 8. (b) 9. (b) 10. (a) 11. (d) 

12. (c) 13. (b) 14. (c)