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NDA General Science Quiz

 Repeaters used in telephone links are:
(a) Rectifiers
(b) Oscillators
(c) Amplifiers
(d) Transformers

Q2. Consider the following four particles:
 1. Alpha particle
 2. Proton
 3. Electron
 4. Neutron
Which of the following is the correct sequence in which their rest-masses increase?
(a) 3-4-2-1
(b) 4-2-3-1
(c) 3-2-4-1
(d) 2-3-1-4

Q3. How many gram atoms of hydrogen are present in 0.04 mole of CuSO4. 5H2O?
(a) 0.04
(b) 0.2
(c) 0.4
(d) 4

Q4. Which one of the following elements shows variable equivalent mass?
(a) Zinc
(b) Silver
(c) Calcium
(d) Iron

Q5. In which one of the following situations a chemical reaction does not occur?
(a) Common salt is exposed to air
(b) Coal is burnt in air
(c) Sodium is placed in water
(d) Iron is kept in moist air

Q6. Protons and neutrons are bound in a nucleus by the
(a) short range ‘weak interaction’
(b) short range ‘strong interaction’
(c) long range ‘electromagnetic interaction’
(d) long range ‘gravitational interaction’

Q7. Which one among the following is not a chemical change?
(a) Curdling of milk
(b) Ripening of fruit
(c) Evaporation of water
(d) Burning of coal

Q8. Vinegar is produced from
(a) ethanoic acid
(b) valeric acid
(c) methanoic acid
(d) butanoic acid

Q9. Yellow colour of usual nitric acid is due to the presence of which one of the following?
(a) N2O
(b) NO
(c) N2O5
(d) NO2

Q10. Equal quantities (50 ml) of the following four samples of water are placed in four beakers of 100 ml capacity. Their boiling points are determined accurately using the same thermometer. Which sample of water will have the lowermost boiling point as compared to other three samples?
(a) Distilled water
(b) Bottled mineral water
(c) Well water
(d) Seawater

Q11. Which one among the following methods is not effective in removing arsenic from contaminated ground water?
(a) Boiling
(b) Reverse osmosis
(c) Ion exchange
(d) Coagulation adsorption

Q12. DIRECTIONS : The following questions consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answer to these items using the codes given below.
50. Statement I: The blue colour of copper sulphate crystal disappears when it is heated strongly.
Statement II: Due to heating, water of crystallization of crystal is lost.
(a) Both the statements individually true and Statement II is the correct explanation of Statement I.
(b) Both the statements are individually true but Statement II is not correct explanation of Statement I.
(c) Statement I is true but Statement II is false.
(d) Statement I is false but Statement II is true.

 1. (c)2. (c)3. (c)4. (d)5. 6. (b)7. (c)8. (b)9. (d)10. (a)11. (a)12. (a)

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