NBRC Test Questions

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PHYSICS

1. Name the process or processes which alternate (s) the passage of gamma rays through matter:
(1) Photoelectric effect (2) Compton Recoils
(3) Pair Production (4) All of these

2. How many quantum numbers do characterise an electron within an atom:
(1) Six (2) Five
(3) Four (4) Three

3. Write down the total number of particles inside the nucleus in terms of mass number (A) and atomic number Z:
(1) A–2Z (2) 2A–Z
(3) 3A–2Z (4) None of these

4. What is the name of the detecting device for discovery of positron:
(1) Electron Microscope (2) Geiger-Muller Counter
(3) Bubble Chamber (4) Cloud Chamber

5. Give the name of the process by which a positron and an electron coalesce to form photons:
(1) Pair Annihilation (2) Compton Scattering
(3) Bremhausstrahlung (4) Rutherford Scattering

CHEMISTRY

6. When solid sodium chloride crystallises from a saturated solution, the entropy change of the system:
(1) Decreases (2) Increases
(3) Zero (4) Remains same with the surrounding

7. Pure water has a PH = 7 at 25 C. The water is heated to 90 C. Choose the right answer:
(1) Kw value will decrease and water will be alkaline
(2) Kw Value will decrease but water will remain neutral
(3) Kw Value will increase and water will be acidic
(4) Kw value will increase but water will remain neutral

8. The vapour pressure of pure components ‘X’ and ‘Y’ are 100 torr and 50 torr respectively at a particular temperature. Assuming solution of X & Y obeying Raoult’s law, the mole fraction of ‘X’ in the vapour phase in equilibrium with a solution containing equimoles of ‘X’ and ‘Y’ is:
(1) 0.33 (2) 0.66
(3) 0.80 (4) 0.50

9. The half life time for a reaction at initial conc. of 0.1 mole/litre and 0.4 mole/litre are 200 sec and 50 sec respectively. The order of the reaction is:
(1) 0 (2) 1
(3) 2 (4) 3

10. Under equilibrium condition for the reaction 2C(s)+O2(g) 2CO(g) the total pressure is 12 atm. The value of Kp is:
(1) 16
(2) 0.5
(3) 2
(4) 32

BIOLOGY

11. The salivary gland of leech secrete the anticoagulating factor:
(1) Hypotoxin (2) Antitoxin
(3) Hirudin (4) None of these

12. The beak is toothed in:
(1) Ostrich (2) Archaeopteryx
(3) Penguin (4) Kiwi

13. Bombykol is:
(1) A hormone (2) An enzyme
(3) A pheromon (4) None of these

14. The major constituent of blood plasma (more than half) is:
(1) Protein (2) Inorganic salts
(3) Fatty substance (4) Sugar

15. Annual Ring indicates:
(1) Age of the tree (2) Branching point
(3) Scale bark (4) Adventitious root