Chemistry · NDA previous year questions

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2020 16 questions

Q512020 · 6 Sept 2020
Chalk and marble are different forms of
1. A.Calcium hydrogen carbonate
2. B.Calcium carbonate
3. C.Calcium acetate
4. D.Sodium carbonate
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Answer: B
Q522020 · 6 Sept 2020
The number of maximum electrons in N Shell is
1. A.2
2. B.8
3. C.18
4. D.32
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Answer: D
Q532020 · 6 Sept 2020
Vinegar is also known as
1. A.ethanoic acid
2. B.nitric acid
3. C.sulphuric acid
4. D.tartaric acid
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Answer: A
Q542020 · 6 Sept 2020
A liquid is kept in a glass beaker. Which one of the following statements is correct regarding the pressure exerted by the liquid column at the base of the beaker ?
1. A.The pressure depends on the area of the base of the beaker
2. B.The pressure depends on the height of liquid column
3. C.The pressure does not depend on the density of the liquid
4. D.The pressure neither depends on the area of the base of the beaker nor on the height of liquid column
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Answer: B
Q622020 · 6 Sept 2020
Which one of the following statements is NOT correct ?
1. A.Buckminsterfullerene is an allotrope of carbon
2. B.Diamond is a good conductor of electricity
3. C.Graphite is a good conductor of electricity
4. D.In graphite, each carbon atom is linked to three other carbon atoms
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Answer: B
Q632020 · 6 Sept 2020
How many covalent bonds are present in a Chloropropane molecule having molecular formula, ?
1. A.6
2. B.8
3. C.9
4. D.10
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Answer: D
Q642020 · 6 Sept 2020
Which one of the following is the most fundamental characteristic of an element ?
1. A.Melting point
2. B.Atomic number
3. C.Colour
4. D.Atomic weight
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Answer: B
Q662020 · 6 Sept 2020
Atomic mass of an element is equal to the sum of number of
1. A.electrons and protons only
2. B.protons and neutrons only
3. C.electrons and neutrons only
4. D.electrons, protons and neutrons
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Answer: B
Q672020 · 6 Sept 2020
Which one of the following element’s isotope is used in the treatment of cancer ?
1. A.Uranium
2. B.Cobalt
3. C.Sodium
4. D.Iodine
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Answer: B
Q712020 · 6 Sept 2020
In an incandescent electric bulb, the filament of the bulb is made up of which metal ?
1. A.Aluminium
2. B.Copper
3. C.Tungsten
4. D.Silver
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Answer: C
Q792020 · 6 Sept 2020
A metallic wire having resistance of $20 Ω$ is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to
1. A. $20 Ω$
2. B. $10 Ω$
3. C. $5 Ω$
4. D. $15 Ω$
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Answer: C
Q892020 · 6 Sept 2020
Which one of the following is the largest composition in biogas ?
1. A.Carbon dioxide
2. B.Methane
3. C.Hydrogen
4. D.Hydrogen sulphide
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Answer: B
Q922020 · 6 Sept 2020
At nearly 70°C, sodium bicarbonate shows the property of gradually decomposing, which makes it usable in bakery products. The product of decomposition responsible for this use of sodium bicarbonate is
1. A.Carbon dioxide
2. B.Hydrogen
3. C.Water vapour
4. D.Oxygen
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Answer: A
Q932020 · 6 Sept 2020
Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are
1. A.5, 10 and 2 respectively
2. B.10, 2 and 5 respectively
3. C.5, 2 and 10 respectively
4. D.2, 5 and 10 respectively
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Answer: A
Q962020 · 6 Sept 2020
Which one of the following is the best example of desiccant ?
1. A.Silica gel
2. B.Polystyrene
3. C.Sodium chloride
4. D.Sodium carbonate
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Answer: A
Q972020 · 6 Sept 2020
Which one of the following was the first mineral acid discovered ?
1. A.Sulphuric acid
2. B.Hydrochloric acid
3. C.Nitric acid
4. D.Phosphoric acid
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Answer: C