Chemistry · NDA previous year questions

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2009 30 questions

Q552009 · 30 Aug 2009
The major combustible component of gobar (cow-dung) gas is
1. A.methane
2. B.carbon dioxide
3. C.hydrogen
4. D.propane
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Answer: A
Q592009 · 30 Aug 2009
Release of which one of the following chemicals is responsible for causing fatigue after muscular activity in human beings?
1. A.Glucuronic acid
2. B.Uric acid
3. C.Pyruvic acid
4. D.Lactic acid
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Answer: D
Q672009 · 30 Aug 2009
A book is kept on the surface of a table. If the gravitational pull of the earth on the book is the force of action, then the force of reaction is exerted by
1. A.the book on the table
2. B.the book on the earth
3. C.the table on the book
4. D.the table on the earth
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Answer: B
Q872009 · 30 Aug 2009
Which one of the following elements exists in liquid state at room temperature?
1. A.Mercury
2. B.Lead
3. C.Sodium
4. D.Calcium
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Answer: A
Q882009 · 30 Aug 2009
Aluminium is more reactive than iron but aluminium is less easily corroded than iron, because
1. A.oxygen forms a protective oxide layer
2. B.it is a noble metal
3. C.iron undergoes reaction easily with water
4. D.iron forms ions
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Answer: A
Q892009 · 30 Aug 2009
According to which one of the following laws it is indicated that when two or more gases react with one another, their volumes bear a simple ratio?
1. A.Law of mass action
2. B.Law of multiple proportions
3. C.Law of reciprocal proportions
4. D.Law of combining volumes
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Answer: D
Q922009 · 30 Aug 2009
Acid turns blue litmus red and base turns red litmus blue. A student tested a liquid with a red litmus paper which remained red with no change. This shows that the liquid
1. A.is not a base
2. B.is not an acid
3. C.is neither an acid nor a base
4. D.must be pure water
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Answer: A
Q932009 · 30 Aug 2009
Arrange the following bases in increasing order of their basic strength : 1. Sodium hydroxide 2. Magnesium hydroxide 3. Aluminium hydroxide 4. Ammonium hydroxide Select the correct answer using the code given below : Code :
1. A.4-2-1-3
2. B.4-1-2-3
3. C.4-3-2-1
4. D.1-2-3-4
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Answer: Dropped in the final answer key (full marks to everyone)
Q942009 · 30 Aug 2009
Consider the following statements : 1. Soap cannot be used in acidic water. 2. Ionic part of a soap is $- CO O^{-} . N a^{+}$ . 3. Soap dissolves in water faster than detergent. Which of the statements given above is/are correct?
1. A.1 and 2
2. B.2 and 3
3. C.3 only
4. D.1 only
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Answer: A
Q952009 · 30 Aug 2009
Match List-I with List-II and select the correct answer using the code given below the Lists : $List-I (Material) A. Cement B. Glass C. Ink D. Soap List-II (Important Ingredient) 1. Sodium salt of fatty acids 2. Carbon black 3. Silica in the form of quartz 4. Aluminates and silicates of calcium$ $Code :$
1. A.A-4, B-3, C-2, D-1
2. B.A-1, B-2, C-3, D-4
3. C.A-1, B-3, C-2, D-4
4. D.A-4, B-2, C-3, D-1
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Answer: A
Q962009 · 30 Aug 2009
The concentration of hydrochloric acid in a given solution is $1 0^{- 8} M$ . What is the value of pH for this solution?
1. A.7
2. B. $> 7$ but not 14
3. C. $< 7$
4. D.14
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Answer: C
Q992009 · 30 Aug 2009
Following statements are made in connection with carbon dioxide ( $C O_{2}$ ) : 1. $C O_{2}$ is a poisonous gas. 2. $C O_{2}$ is an acidic oxide. 3. $C O_{2}$ turns limewater milky. Which of the statements given above is/are correct?
1. A.1 and 2
2. B.2 and 3
3. C.3 only
4. D.1 and 3
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Answer: B
Q1002009 · 30 Aug 2009
Which of the following is the best example of the law of conservation of mass?
1. A.When 12 gm of carbon is heated in vacuum, there is no change in mass
2. B.Weight of platinum wire is the same before and after heating
3. C.A sample of air increases in volume when heated at constant pressure but mass remains unchanged
4. D.12 gm of carbon combines with 32 gm of oxygen to give 44 gm of carbon dioxide
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Answer: D
Q1022009 · 30 Aug 2009
Directions : The following three (3) items consist of two statements, one labelled as 'Assertion (A)' and the other as 'Reason (R)'. You are to examine these two statements carefully and select the answers to these items using the code given below : Code : (a) Both A and R are individually true and R is the correct explanation of A (b) Both A and R are individually true but R is not the correct explanation of A (c) A is true but R is false (d) A is false but R is true Assertion (A) : On a wet floor of a bathroom, a small circular area around a pinch of foam appears to be dry. Reason (R) : Soap molecules reduce surface tension and increase surface area of the thin layer of water on the wet floor.
1. A.A
2. B.B
3. C.C
4. D.D
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Answer: A
Q532009 · 19 Apr 2009
The metal compound commonly found in Sindhoor or Kumkum is based on
1. A.Tin
2. B.Lead
3. C.Copper
4. D.Zinc
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Answer: B
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