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November 2020

►- Online workshop - "How to Model Our Universe"

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. Sreejith P
Department of Physics
Malabar Christian College, Calicut
1. What is the CME of the Sun? √ Coronal Mass Ejection ⃝ Coronal Material Earth ⃝ Carbon Mass Ejection ⃝ None of these 2. What is the current sunspot cycle? √ Solar cycle 25 ⃝ Solar cycle 24 ⃝ Solar cycle 23 ⃝ Solar cycle 21 3. What is size of sunspot? √ Greater than 1500 km ⃝ 10 km ⃝ 20 km ⃝ 5 km 4. Equatorial plasma bubble is ⃝ Troposphere irregularities √ Ionosphere irregularities ⃝ Mesosphere irregularities ⃝ None of these 5. What do you mean by GPS? ⃝ Global Pollution System √ Global Positioning System ⃝ General Positioning System ⃝ None of the above Page 5 6. F-region of ionosphere is known as ⃝ Alfren Layer ⃝ Saha Layer √ Appleton Barnett Layer ⃝ None of these 7. What is the range of F layer? √ about 150 to 220 km ⃝ about 30 km ⃝ about 40 km ⃝ none of the above 1. Condition for any nuclei to be NMR active is that ⃝ Atomic number should be odd ⃝ Mass number should be odd ⃝ Both atomic number and mass number should be odd ⃝ Both atomic number and mass number should be even 2. What Signal splitting in NMR arises from ⃝ Shielding effect ⃝ Spin-spin decoupling ⃝ Spin-spin coupling ⃝ Deshielding effect 3. The ratio of peak splitting in triplet is ⃝ 1:1 ⃝ 1:2 ⃝ 1:2:1 ⃝ 1:3:3:1 4. In proton NMR spectroscopy, hydrogen bonding results in ⃝ Shielding effect ⃝ Deshielding effect ⃝ Peak splitting ⃝ All of the above Page 6 5. Which of the following environmental effect is influenced by magnetic field strength? ⃝ Chemical shift ⃝ Spin splitting ⃝ Both are influenced ⃝ Both are not influenced 6. Spin-spin coupling is not observed when the protons are separated by more than ⃝ one sigma bond ⃝ Two sigma bond ⃝ Three sigma bonds ⃝ Four sigma bonds 7. Chemical shift has the units of ⃝ Parts per million ⃝ Parts per billion ⃝ Tesla ⃝ No units 8. Equivalent protons in a molecule will have ⃝ Same environment ⃝ Same chemical shift ⃝ Same shielding effect ⃝ All of the above 9. Coupling constant of two nuclei is defined as ⃝ Ratio of chemical shifts ⃝ Distance between splitted peaks in Hz ⃝ Difference of chemical shifts ⃝ Ratio of absorption frequencies

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►- Online workshop - "How to Model Our Universe"

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