Chemistry · NDA previous year questions

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2009 30 questions

Q552009 · 19 Apr 2009
Which among the following elements (metals) pollutes the air of a city having large number of automobiles ?
1. A.Cadmium
2. B.Lead
3. C.Chromium
4. D.Nickel
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Answer: B
Q562009 · 19 Apr 2009
Oxygen and ozone are
1. A.allotropes
2. B.isomers
3. C.isotopes
4. D.isobars
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Answer: A
Q582009 · 19 Apr 2009
Which among the following is a chemical change ?
1. A.A wet towel dries in the sun
2. B.Lemon juice added to tea causing its colour to change
3. C.Hot air rises over a radiator
4. D.Coffee is brewed by passing steam through ground coffee
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Answer: B
Q592009 · 19 Apr 2009
Which among the following is an element ?
1. A.Alumina
2. B.Brass
3. C.Graphite
4. D.Silica
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Answer: C
Q602009 · 19 Apr 2009
Consider the following equation for the formation of ammonia from nitrogen and hydrogen : How many hydrogen molecules are required to react with 100 molecules of nitrogen ?
1. A.100
2. B.200
3. C.300
4. D.400
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Answer: C
Q612009 · 19 Apr 2009
Which one among the following is used as a moderator in nuclear reactors ?
1. A.Ozone
2. B.Heavy hydrogen
3. C.Heavy water
4. D.Hydrogen peroxide
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Answer: C
Q622009 · 19 Apr 2009
Which one of the following contains maximum percentage of nitrogen by mass ?
1. A.Urea
2. B.Ammonium cyanide
3. C.Ammonium carbonate
4. D.Ammonium nitrate
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Answer: B
Q642009 · 19 Apr 2009
Two elements gallium and oxygen combine to form a compound $G a_{2} O_{3}$ . Which among the following is the valency of gallium ?
1. A.1
2. B.2
3. C.3
4. D.4
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Answer: C
Q652009 · 19 Apr 2009
Vinegar is the trade name of
1. A.Acetic acid
2. B.Chloroform
3. C.Carbon tetrachloride
4. D.Ethyl alcohol
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Answer: A
Q662009 · 19 Apr 2009
Consider the following statements regarding diamond : 1. It is an allotrope of silicon. 2. It is a bad conductor of heat and electricity. 3. It is the hardest substance. 4. It burns to produce carbon dioxide. Which of the statements given above are correct ?
1. A.1, 2, 3 and 4
2. B.2, 3 and 4 only
3. C.1 and 2 only
4. D.1, 3 and 4 only
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Answer: B
Q672009 · 19 Apr 2009
Which one of the following chemicals is used in Beauty Parlours for hair-setting ?
1. A.Sulphur based
2. B.Phosphorus based
3. C.Silicon based
4. D.Iron based
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Answer: A
Q712009 · 19 Apr 2009
Which among the following thermometers is preferred for measuring temperature around $125 0^{\circ} C$ ?
1. A.Mercury thermometer
2. B.Constant volume gas thermometer
3. C.Optical pyrometer
4. D.Platinum resistance thermometer
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Answer: C
Q782009 · 19 Apr 2009
Propagation of light quanta may be described by
1. A.Photons
2. B.Protons
3. C.Neutrons
4. D.Electrons
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Answer: A
Q842009 · 19 Apr 2009
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 ?
1. A.3 - 4 - 2 - 1
2. B.4 - 2 - 3 - 1
3. C.3 - 2 - 4 - 1
4. D.2 - 3 - 1 - 4
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Answer: C
Q1032009 · 19 Apr 2009
Directions : Each of the following items consists of two statements, one labelled as the 'Assertion (A)' and the other as 'Reason (R)'. Examine the two statements carefully and select the answer using the codes given below. Assertion (A) : Carbon can form more compounds than any other element. Reason (R) : Carbon can exist in various allotropes.
1. A.Both A and R are individually true and R is the correct explanation of A
2. B.Both A and R are individually true but R is not the correct explanation of A
3. C.A is true but R is false
4. D.A is false but R is true
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Answer: B