- Chromatography is a physical method that is used to separate and analyze?
a) Simple mixtures
b) Complex mixtures
c) Viscous mixtures
d)none of these - In chromatography, which of the following can the mobile phase be made of?
a) Solid or liquid
b) Liquid
c) Gas only
d) Liquid or gas - Which of the following cannot be used as an adsorbent in Column adsorption chromatography? (PPSC 2015)?
a) Potassium permanganate
b) Silica gel
c) Activated alumina
d) Magnesium oxide - In which of the following type of paper, chromatography does the mobile phase move horizontally over a circular sheet of paper?
a) Ascending paper chromatography
b) Descending paper chromatography
c) Radial paper chromatography
d) Ascending – descending chromatography - Which of the following is not an advantage of Syringe type pumps used in High pressure liquid chromatography?
a) Independent of viscosity
b) Pulse-less flow
c) High pressure capability
d) Unlimited solvent capacity - Syringe pumps used in High pressure liquid chromatography are most suitable for which of the following columns? (PPSC 2020)?
a) Capillary columns
b) Guard columns
c) Short-fast columns
d) Small bore columns - Which of the following is a special adsorbent used in gas-solid chromatography?
a) Molecular sieves
b) Silica gel
c) Alumina
d) None of these - Which of the following is the disadvantage of hydrogen, which can be used as carrier gas in gas chromatography? (PPSC 2017)?
a) low Density
b) Expensive
c) Reduced sensitivity
d) None of these - In which of the following methods are liquid samples injected into the column in gas chromatography? (PPSC 2021)?
a) Gas tight syringe
b) Micro-syringe
c) Rotary sample valve
d) None of these - Capillary columns are open tubular columns constructed from which of the following materials?
a) Glass
b) Metal
c) Stainless steel
d) None of these - Which of the following is not a desirable feature of the ovens used in gas chromatography?
a) It must have a fast rate of heating
b) Power consumption should be kept low
c) It must have maximum thermal gradients
d) None of these - Which of the following steps takes place after injection of feed in Column chromatography?
a) Detection of components
b) Separation in the column
c) Elution from the column
d) Collection of eluted component - What happens during the ‘elution from the column’ phase in chromatography?
a) Components with greatest affinity elute first
b) Components with least affinity elute first
c) Components elute in a random manner
d) Components elute according to their concentration in the mixture - In chromatogram, the position of peaks on the time axis can be used to determine which of the following?
a) Components of the sample
b) Column resolution
c) Column efficiency
d)none of these - Affinity chromatography separation is based on?
a) specific interaction between the analyte and the ligand
b) the flow-through time of the analyte
c) the duration of the analyte
d) molecular weights - Which of the following is not the application of gel filtration? (PPSC 2021)?
a) Purification
b) Relative molecular mass determination
c) Protein concentration
d) None of these - Which solvent is usually used for SEC in our lab? (PPSC 2015)?
a) tetrahydrofuran
b) toluene
c) water
d) None of these - Jet Separator is used to introduce the———–into MS than carrier gas?
a) More analyte
b) Blank sample
c) Gross sample
d) none of these - Charge transfer is commonly known as:?
a) Cationization
b) Desorption
c) Electron Ejection
d) none of these - Which of the following species will be deflected to the greatest extent? (ppsc 2020)?
a) 37Na+
b) 35Na+
c) 37Na
d) 35Na2+ - Which of the following is not used for mass spectrometry? (PPSC 2015)?
a) calculating the isotopic abundance in elements
b) investigating the elemental composition
c) confirming the presence of O-H and C=O in organic compounds
d) None of these - The correct order for the basic features of a mass spectrometer is… (PPSC 2017)?
a) acceleration, deflection, detection, ionization
b) ionization, acceleration, deflection, detection
c) acceleration, ionization, deflection, detection
d) None of these
23.Separations in ions in mass spectrometer take place based on which of the following? (PPSC 2021)?
a) Charge To mass ratio
b) Molecular weight
c) Mass to charge ratio
d) none
- In a mass spectrometer, the ion currents are measured using one of the following?
a) Scintillation counter
b) ion counter
c) Electric fields
d) Electrometer tube - Which type of ionic species are allowed to pass through the slit and reach the collecting plate?
a) Negative ions of all masses
b) positive ions of the specific mass
c) Positive ions of all masses
d) none of these
26- Subtropical Pine Forests are also known as?
a) Himalayan Subtropical Pine Forests
b) Karakoram Subtropical Pine Forests
c) Sun Hamalian Subtropical Pine Forests
d) Margala Subtropical Pine Forests
27- Alpine Forests are divided into __ categories in Pakistan?
a) 1
b) 2
c) 3
d) 4
28- M-5 , Multan to Sukkur Motorways has a length of __ km?
a) 155
b) 367
c) 210
d) 392
29- Sahiwal Power station has energy input in the form of____?
a) Natural Gas
b) Oil
c) Nuclear
d) Coal
30- Quaid e Azam solar Park in Bahawalpur has current electricity production capacity __ MW?
a) 360
b) 380
c) 400
d) 420
