Chemistry · NDA previous year questions

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2022 23 questions

Q512022 · 4 Sept 2022
Which one of the following statements about earthquake waves is not correct?
1. A.P waves move faster and are the first to arrive at the surface.
2. B.P waves can travel through gaseous, liquid and solid materials.
3. C.Seismographs located beyond 145° from epicentre can record the arrival of P waves.
4. D.P waves have maximum area covered under its shadow zone.
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Answer: D
Q602022 · 4 Sept 2022
Which one of the following metals floats in cold water?
1. A.Magnesium
2. B.Calcium
3. C.Potassium
4. D.Copper
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Answer: B
Q612022 · 4 Sept 2022
Which one of the following solutions is not capable of conducting electricity?
1. A.Copper sulphate
2. B.Sodium chloride
3. C.Sugar
4. D.Sodium hydroxide
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Answer: C
Q632022 · 4 Sept 2022
Which of the following compounds undergoes/undergo thermal decomposition?
1. A.Zinc oxide
2. B.Silver oxide and zinc oxide
3. C.Silver oxide
4. D.Magnesium oxide
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Answer: C
Q652022 · 4 Sept 2022
Silver artifacts get tarnished in the air due to the formation of
1. A.silver chloride
2. B.silver oxide
3. C.silver sulphide
4. D.silver sulphate
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Answer: C
Q712022 · 4 Sept 2022
The breakdown of glucose in cytoplasm results in the formation of
1. A.pyruvate and energy
2. B.pyruvate and carbon dioxide
3. C.pyruvate and oxygen
4. D.pyruvate and nitrogen
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Answer: A
Q792022 · 4 Sept 2022
Which one of the following salts does not possess water of crystallization?
1. A.Potassium permanganate
2. B.Blue vitriol
3. C.Washing soda
4. D.Mohr’s salt
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Answer: A
Q802022 · 4 Sept 2022
Bee sting leaves an acid which causes pain and irritation. The acid released is
1. A.tartaric acid
2. B.methanoic acid
3. C.ethanoic acid
4. D.citric acid
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Answer: B
Q812022 · 4 Sept 2022
Liquid vegetable oils are converted to solid margarine by the use of
1. A.hydrogen gas
2. B.chlorine gas
3. C.carbon dioxide gas
4. D.oxygen gas
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Answer: A
Q992022 · 4 Sept 2022
Which one of the following metals is most commonly used for making filament of incandescent electric bulbs?
1. A.Aluminium
2. B.Silver
3. C.Copper
4. D.Tungsten
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Answer: D
Q662022 · 10 Apr 2022
For an element with atomic number 35, which one of the following will be the correct number of electrons in its valence shell based on Bohr's model of an atom?
1. A.1
2. B.3
3. C.5
4. D.7
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Answer: D
Q672022 · 10 Apr 2022
Which one of the following is not an example of a redox reaction?
1. A. $AlC l_{3} + 3 H_{2} O \to Al (OH)_{3} + 3HCl$
2. B. $2NaH \to 2Na + H_{2}$
3. C. $4Fe + 3 O_{2} \to 2F e_{2} O_{3}$
4. D. $CuS O_{4} + Zn \to Cu + ZnS O_{4}$
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Answer: A
Q682022 · 10 Apr 2022
Which one of the following allotropes of carbon is isomorphous with crystalline silicon?
1. A.Coke
2. B.Diamond
3. C.Graphite
4. D.Coal
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Answer: B
Q692022 · 10 Apr 2022
Which one of the following is the colour of hydrogen gas?
1. A.Light yellow
2. B.Orange
3. C.Black
4. D.Colourless
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Answer: D
Q702022 · 10 Apr 2022
Which one of the following is not a pigment?
1. A.Zinc oxide
2. B.Chalk
3. C.White lead
4. D.Silica
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Answer: D
Q712022 · 10 Apr 2022
Which one of the following statements about fertilizers is not correct?
1. A.Urea is a phosphorus-containing fertilizer.
2. B.Application of fertilizer to the soil increases fertility of the soil.
3. C.Urea can be prepared by action of ammonia and carbon dioxide under high pressure and at high temperature.
4. D.Urea contains more nitrogen than other fertilizers.
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Answer: A
Q812022 · 10 Apr 2022
Which one of the following is a chemical change?
1. A.Dissolving sugar in water
2. B.Melting of ice
3. C.Crystallization
4. D.Milk turning sour
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Answer: D
Q822022 · 10 Apr 2022
Which one of the following is the correct molecular formula of ammonium carbonate if the valency of ammonium ion is (+1) and carbonate anion is (-2)?
1. A. $(N H_{4})_{2} C O_{3}$
2. B. $N H_{4} (C O_{3})_{2}$
3. C. $(N H_{3})_{2} C O_{3}$
4. D. $N H_{4} C O_{3}$
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Answer: A
Q832022 · 10 Apr 2022
Which one of the following is a covalent compound?
1. A.Calcium oxide
2. B.Sodium nitride
3. C.Silicon carbide
4. D.Zinc sulphide
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Answer: C
Q842022 · 10 Apr 2022
The mass number of argon is 40. Which one of the following statements is correct?
1. A.The number of protons in argon is 22.
2. B.The number of neutrons in argon is 18.
3. C.The number of electrons in argon is 18.
4. D.The sum of numbers of protons and electrons in argon is 40.
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Answer: C
Q852022 · 10 Apr 2022
Which one of the following is the correct order of the valencies of elements Ne, Si, N and Mg?
1. A.Ne < Mg < N < Si
2. B.Si < N < Mg < Ne
3. C.Ne < N < Si < Mg
4. D.Mg < Ne < N < Si
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Answer: A
Q932022 · 10 Apr 2022
Which one of the following reactions is an example of decomposition reaction?
1. A. $C H_{4} (g) + 2 O_{2} (g) \to C O_{2} (g) + 2 H_{2} O (g)$
2. B. $2AgCl (s) Sunlight 2Ag (s) + C l_{2} (g)$
3. C. $CuO + H_{2} Heat Cu + H_{2} O$
4. D. $Fe (s) + CuS O_{4} (aq) \to FeS O_{4} (aq) + Cu (s)$
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Answer: B
Q1022022 · 10 Apr 2022
Why are the tyres of aircrafts made of conducting rubber? 1. So that the charge accumulated on the aircraft in flight, by rubbing the air, can easily be transferred to ground on landing. 2. So that the charge accumulated due to the operation of various electronic equipments in the aircraft in flight can easily be transferred to ground on landing. Select the correct answer using the code given below.
1. A.1 only
2. B.2 only
3. C.Both 1 and 2
4. D.Neither 1 nor 2
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Answer: A