Chemistry · NDA previous year questions

2023 23 questions

1. Q542023 · 3 Sept 2023

   The heating element in an electric iron is usually made of

   1. A.Constantan
   2. B.Tungsten
   3. C.Nichrome
   4. D.Copper
   Show answer

   Answer: C

2. Q572023 · 3 Sept 2023

   Which one of the following alloys contains a non-metal as one of its constituent?

   1. A.Brass
   2. B.Bronze
   3. C.Amalgam
   4. D.Steel
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   Answer: D

3. Q582023 · 3 Sept 2023

   Buckminster fullerene, which looks like a football, is an allotropic form of

   1. A.Phosphorus
   2. B.Sulfur
   3. C.Carbon
   4. D.Tin
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   Answer: C

4. Q612023 · 3 Sept 2023

   Consider the following reaction: $$\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3(\mathrm{s})+2Al(\mathrm{s})\to 2Fe(\mathrm{s})+\mathrm{A}{\mathrm{l}}_2{\mathrm{O}}_3(\mathrm{s})$$ Which of the following statements about the given reaction is NOT correct?

   1. A.It is an example of displacement reaction
   2. B.It is highly endothermic reaction
   3. C.$\mathrm{F}{\mathrm{e}}_2{\mathrm{O}}_3$ acts as oxidizing agent
   4. D.This reaction is applicable to joining of railway tracks
   Show answer

   Answer: B

5. Q622023 · 3 Sept 2023

   Match List I with List II and select the correct answer using the code given below the Lists: $$\begin{array}{llll}\text{LIST I}& & \text{LIST II}& \\ \text{(Chemical process)}& & \text{(Reaction)}& \\ \text{A.}& \text{Electrolysis of water}& 1.& \text{Double displacement reaction}\\ \text{B.}& \text{Burning of coal}& 2.& \text{Combination reaction}\\ \text{C.}& \text{Iron nail immersed in copper sulphate solution}& 3.& \text{Decomposition reaction}\\ \text{D.}& \text{Addition of barium chloride solution to aluminium sulphate solution}& 4.& \text{Displacement reaction}\end{array}$$

   1. A.A - 3, B - 4,C - 2, D - 1
   2. B.A - 4, B - 2,C - 1, D - 3
   3. C.A - 3, B - 2,C - 4, D - 1
   4. D.A - 4, B - 1,C - 2, D - 3
   Show answer

   Answer: C

6. Q632023 · 3 Sept 2023

   Which one of the following processes involves chemical reaction?

   1. A.Evaporation of petrol
   2. B.Dissolution of salt in water
   3. C.Storing of oxygen gas under pressure in a gas cylinder
   4. D.Burning of magnesium ribbon in air
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   Answer: D

7. Q642023 · 3 Sept 2023

   Which one of the following metals does NOT react with cold water to liberate hydrogen gas?

   
   1. A.Potassium
   2. B.Iron
   3. C.Calcium
   4. D.Sodium 2 3
   Show answer

   Answer: B

8. Q652023 · 3 Sept 2023

   Consider the following reaction: $$2HgO\stackrel{\mathrm{\Delta }}{\to }2Hg+{\mathrm{O}}_2$$ The respective state of $\mathrm{HgO}$, $\mathrm{Hg}$ and ${\mathrm{O}}_2$ in the above reaction is

   1. A.Liquid, solid, gas
   2. B.Solid, solid, gas
   3. C.Liquid, solid, liquid
   4. D.Solid, liquid, gas
   Show answer

   Answer: D

9. Q792023 · 3 Sept 2023

   Which one of the following acid is used by goldsmith for cleaning of gold and silver articles?

   1. A.Sulphuric acid
   2. B.Nitric acid
   3. C.Hydrochloric acid
   4. D.Phosphoric acid
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   Answer: B

10. Q802023 · 3 Sept 2023

    What is the action of litmus on ethanol?

    1. A.Litmus is neutral towards ethanol
    2. B.Ethanol turns blue litmus to red; confirming acidic nature of ethanol
    3. C.Ethanol turns red litmus to blue; confirming basic nature of ethanol
    4. D.Ethanol decolorizes litmus through bleaching action
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    Answer: A

11. Q812023 · 3 Sept 2023

    Which one of the following metal is NOT an essential component in stainless steel?

    1. A.Iron
    2. B.Nickel
    3. C.Chromium
    4. D.Tin
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    Answer: D

12. Q922023 · 3 Sept 2023

    Which one of the following metals can be extracted using carbon as reducing agent?

    1. A.Zinc
    2. B.Silver
    3. C.Gold
    4. D.Aluminum
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    Answer: A

13. Q1012023 · 3 Sept 2023

    How many of the following materials can be attracted by a magnet? 1. Plastic 2. Carbon 3. Aluminium 4. Stainless Steel Select the correct answer using the code given below:

    1. A.1
    2. B.2
    3. C.3
    4. D.None
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    Answer: D

14. Q642023 · 16 Apr 2023

    Which of the hydrocarbons are arranged as per the increasing order of their boiling points?

    1. A.Methane, Butane, Propane, Heptane
    2. B.Propane, Butane, Pentane, Octane
    3. C.Propane, Butane, Heptane, Methane
    4. D.Octane, Ethane, Methane, Propane
    Show answer

    Answer: B

15. Q662023 · 16 Apr 2023

    An iron nail dipped in copper sulphate solution turns brown. This is due to which one of the following types of reactions?

    1. A.Addition reaction
    2. B.Decomposition reaction
    3. C.Substitution reaction
    4. D.Displacement reaction
    Show answer

    Answer: D

16. Q682023 · 16 Apr 2023

    Toothpaste prevents tooth decay by:

    1. A.neutralizing the excess acidity.
    2. B.means of emulsification.
    3. C.the action of fluoride.
    4. D.making a coat of calcium over the teeth surface.
    Show answer

    Answer: A

17. Q752023 · 16 Apr 2023

    Mica is mainly used in:

    1. A.food and beverage industry.
    2. B.iron and steel industry.
    3. C.aluminium industry.
    4. D.electrical and electronic industries. 1 2 1 1 2 2
    Show answer

    Answer: D

18. Q812023 · 16 Apr 2023

    What is the specific purpose of using potassium hydroxide during the saponification process?

    1. A.To obtain soaps which are hard on the skin
    2. B.To obtain soaps which are soft on the skin
    3. C.To obtain natural fragrance
    4. D.To make the saponification very economical
    Show answer

    Answer: B

19. Q822023 · 16 Apr 2023

    Which one of the following is the correct arrangement of metals in the decreasing order of their reactivity?

    1. A.Iron, Sodium, Silver, Copper
    2. B.Silver, Copper, Iron, Sodium
    3. C.Sodium, Copper, Silver, Iron
    4. D.Sodium, Iron, Copper, Silver
    Show answer

    Answer: D

20. Q832023 · 16 Apr 2023

    Which among the following statements is not correct with respect to allotropes of Carbon?

    1. A.Graphite is a good conductor of electricity.
    2. B.Diamond is the hardest substance known.
    3. C.Fullerene is one of the allotropes of carbon.
    4. D.Next to diamond, graphite is the second hardest known substance.
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    Answer: D

21. Q882023 · 16 Apr 2023

    Equal volume of all gases, when measured at the same temperature and pressure, contain an equal number of particles. Who proposed the above law?

    1. A.Charles
    2. B.Boyle
    3. C.Avogadro
    4. D.Lussac
    Show answer

    Answer: C

22. Q892023 · 16 Apr 2023

    Airbags work on the principle of a chemical reaction triggered by the impact producing a gaseous product that causes a sudden volume change. Which one among the following chemical conversions is responsible for this?

    1. A.Sodium azide into nitrogen gas
    2. B.Solid carbon dioxide into gaseous carbon dioxide
    3. C.Carbon dioxide into carbon monoxide
    4. D.Sudden conversion of gaseous carbon dioxide into carbon monoxide
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    Answer: A

23. Q972023 · 16 Apr 2023

    What is the total resistance in the following circuit element?

    
    1. A.R/2
    2. B.3R
    3. C.3R/2
    4. D.2R/3
    Show answer

    Answer: C