NDA Sample Paper – Chemistry


Sample papers


NDA SAMPLE PAPER

SUBJECT – CHEMISTRY

  1. The state of matter characterised by both a definite shape and definite volume is –




(a) fluid               (b) liquid                (c) solid                    (d) gas

2. Which one of the following is not a physical property of matter?

(a) density           (b) combustibility   (c) solubility            (d) electrical conductivity

3. The smallest particle in which matter can exist is called –

(a) an ion             (b) an atom             (c) an molecule      (d) an element

4. Which of the following is neither an element nor a compound?

(a) Glucose          (b) Carbon             (c) Silver               (d) Air

5. A mixture of water and alcohol can be separated by –

(a) permutation    (b) evaporation     (c) distillation        (d) decantation

6. All the following substances are chemical mixtures except –

(a) wood               (b) common salt    (c) hard water       (d) rusty iron filings

7. When a gas confined in a vessel under pressure, is allowed to escape through a small orifice, the phenomenon is called –

(a) effusion          (b) diffusion           (c) filtration          (d) sedimentation

8. The chemical properties of an atom are determined by its –

(a) atomic weight (b) atomic number (c) number of isotopes   (d) binding energy

9. Which of the following is monatomic?

(a) Oxygen           (b) Nitrogen             (c) Fluorine                   (d) Neon

10. Sodium hydrogen sulphate is –

(a) simple salt     (b) a basic salt          (c) an acid salt                (d) an acid

11. The process in which the oxidation number increases is known as-

(a) reduction        (b) oxidation            (c) physical change         (d) sublimation

12. An alpha – particle consists of –

(a) two protons and two neutrons

(b) four protons

(c) two protons and two electrons

(d) two protons only

13. The number of N2 molecules present in 28 grams of nitrogen is –

(a) one              (b) 3 * 1011 (c) 5 * 1030 (d)   6.06 * 1023

14. Atoms of the same atomic number but different atomic weights are known as –

(a) Polymers     (b) Isomers                  (c) Isotopes                     (d) Isobars

15. Pyrophosphoric acid has the chemical formula –

(a) H3PO4 (b) H4P2O7 (c) HPO3 (d) H3PO3

16. In an atom the protons are present –

(a) within the nucleus

(b) outside the nucleus

(c) both within the nucleus and outside

(d) neither within nor outside the nucleus

17. The valiancy sheet of calcium contains –

(a) 4 electrons     (b) 2 electrons           (c) 6 electrons                  (d) 8 electrons

18. The density of the gas A is twice that of gas B. If the molecular weight of the gas A is M, the molecular weight of gas B is –

(a) 2 M              (b) m /2                      (c) 4 M                               (d) M

19. The atomic number of an element is the number of –

(a) neutrons in its nucleus

(b) electrons in its nucleus

(c) protons in its nucleus

(d) none of these

20. Density of nitrogen gas prepared from air is slightly greater than that of nitrogen prepared by chemical reaction from a compound of nitrogen because aerial nitrogen contains –

(a) Carbon dioxide

(b) Argon

(c) some N3 molecules analogous toO3

(d) greater amount of N2 molecules derived from N – 15 isotopes

21. The lightest metal is –

(a) Li                (b) Mg             (c) Ca                  (d) Na

22. Which of the following is the best example of law of Conservation of Mass?

(a) When 12 grams of carbon is heated in vacuum, there is no change in

(b) The volume of sample of air increases when heated at constant pressure but its mass remains unaltered

(c) The weight of a piece of platinum is the same before and after heating in air

(d) 12 grams of carbon combine with 32 grams of oxygen to from 44 grams of carbon dioxide

23. The formation of nucleus from its constituent particles involves –

(a) slight increase in mass

(b) slight decrease in mass

(c) no change in mass

(d) no change in mass and energy

24. The catalyst used in the manufacture of Sulphuric acid by contact process is –

(a) Al2O3 (b) V25 (c) Cr2O3 (d) MnO2

25. Potassium sulphide is a compound which is –

(a) electrovalent        (b) covalent         (c) coordinate covalent     (d) none of these

26. A gas which turns brown on exposure to air is –

(a) CO2 (b) NO                 (c) N2O              (d) Br2

27. In periodic table, in a group as the atomic number decreases –

(a) Electropositive nature goes on decreasing

(b) Ionization potential goes on decreasing

(c) Electronegativity goes on decreasing

(d) None of these

28. At 270 C a gas was compressed to half its volume. To what temperature must it now be heated so that it occupies just original volume?

(a) 6000 C               (b)       2870 C    (c) 3270 C            (d) None of these

29. When a piece of metal is oxidized, the resulting oxide is –

(a) Lighter than the original metal

(b) Heavier than the original metal

(c) As heavy as the original metal

(d) Sometime heavier and sometimes lighter, depending upon the nature of the metal

30. A reducing agent is one which –

(a) accepts electrons

(b) donates electrons

(c) neither accepts not donates electrons

(d) donates protons

31. Which one of the following contains the same number of atoms as 12 grams of magnesium?(Atomic weights : Mg = 24; C = 12; Ca = 40)

(a) 12 grams of carbon

(b) 24 grams of carbon

(c) 40 grams of calcium

(d) 20 grams of calcium

32. A certain current liberates 0.504 gm. of hydrogen in 2 hours. How many grams of cooper can be liberated by the same current flowing for the same time in a copper sulphate solution?

(Atomic weight: Cu = 63.5, S = 32, O = 16)

(a) 12.8 gms. (b) 32.0 gms.   (c) 16.0 gms.    (d) 64.0 gms.

33. Which of the following would release hydrogen from both dilute sulphuric acid and a solution of sodium hydroxide?

(a) Iron           (b) Zinc            (c) Copper       (d) Iodine

34. In two oxides of carbon, the ration of the fixed weight of carbon with varying weights of oxygen is 1:2. This is in accordance with the law of –

(a) multiple proportion

(b) conservation of mass

(c) definite proportion

(d) reciprocal proportion

35. The most electronegative element is –

(a) Sodium       (b) Fluorine     (c) Hydrogen     (d) Bromine

1. – c 8. – b 15.. – b 22. – d 29. – b
2. – b 9. – d 16. – a 23. – b 30. – b
3. – c 10. – c 17. – b 24. – b 31. – d
4. – d 11. – b 18. – b 25. – a 32. – c
5. – c 12. – a 19. – c 26. – b 33. – b
6. – b 13. – d 20. – b 27. – a 34. – a
7. – a 14. – c 21. – a 28. – c 35. – b


 

 

 

 



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