GK in English

GK Chapterwise – CDS Previous Year Papers

Table of Contents

101. Which of the following gases in the atmosphere is/are responsible for acid rains?
1. Oxides of sulphur 2. Oxides of nitrogen
3. Oxides of carbon Select the correct answer using the codes given below

(a)1 and 2
(b) 1 and 3
(c) Only 2
(d) 1, 2 and 3
Ans: (a)

CDS (I) 2015

102. Which one among the following gases readily combines with the haemoglobin of the blood?

(a)Methane
(b) Nitrogen dioxide
(c) Carbon monoxide
(d) Sulphur dioxide
Ans: (c)

CDS (II) 2011

103. Which element forms the highest number of compounds in the periodic table?

(a)Carbon
(b) Oxygen
(c) Silicon
(d) Sulphur
Ans: (a)

CDS (I) 2013

104. Which one among the following is responsible for the expansion of water in the ocean?

(a)Carbon dioxide
(b) Nitrogen dioxide
(c) Carbon monoxide
(d) Sulphur dioxide
Ans: (a)

CDS (I) 2015

105. Food cans are coated with tin but not with zinc because

(a)zinc is costlier than tin
(b) zinc has a higher melting point than tin
(c) zinc is more reactive than tin
(d) tin is more reactive than zinc
Ans: (c)

CDS (II) 2019

106. Which allotropy of carbon is in rigid three- dimensional structure?

(a)Graphite
(b) Fullerene
(c) Diamond
(d) Carbon black
Ans: (c)
CDS Exam (II) 2012

107. What type of mixture is smoke?

(a)Solid mixed with a gas
(b) Gas mixed with a gas
(c) Liquid mixed with a gas
(d) Gas mixed with a liquid and a solid
Ans: (d)
CDS Exam (I) 2007

108. A compound that is a white solid which absorbs water vapour from the air is

(a)sodium nitrate
(b) calcium chloride
(c) sodium carbonate
(d) calcium sulphate
Ans: (d)

CDS (I) 2009

109. What are the elements which are liquids at room temperature and standard pressure?
1. Helium 2. Mercury
3. Chlorine 4. Bromine Select the correct answer using the codes given below

(a)2 and 3
(b) 2, 3 and 4
(c) 2 and 4
(d) 1 and 3
Ans: (c)

CDS (II) 2018

110. A liquid initially contracts when cooled down to 4°C but on further cooling down to 0°C, it expands. The liquid is

(a)alcohol
(b) water
(c) molten iron
(d) mercury
Ans: (b)
CDS Exam (II) 2016

111. Consider the following statements. Statement I: Clay layers are poor aquifers.
Statement II: The inter-particle space of clay minerals is the least.
Select the correct answer using the codes given below:

(a)Both the statements are individually true and Statement II is the correct explanation of Statement I
(b) Both the statements are individually true but Statement II is not the correct explanation of Statement I
(c) Statement I is true but Statement II is false
(d) Statement I is false but Statement II is true
Ans: (a)

CDS (I) 2010

112. Which of the following are the two main constituents of granite?

(a)Iron and silica
(b) Iron and silver
(c) Silica and aluminium
(d) Iron oxide and potassium
Ans: (c)

CDS (II) 2015

113. A metal screw top on a glass bottle which appears to be stuck could be opened by using the fact that

(a)the metal expands more than the glass when both are heated
(b) the metal and glass expand identically when heated
(c) the metal shrinks when heated
(d) Both metal and glass shrink when cooled
Ans: (a)
CDS Exam (II) 2011

114. Iron sheet kept in moist air covered with rust. Rust is

(a)an element
(b) a compound
(c) a mixture of iron and dust
(d) a mixture of iron, oxygen and water
Ans: (b)

CDS (II) 2013

115. Which one of the following gases is supporter of combustion?

(a)Hydrogen
(b) Nitrogen
(c) Carbon dioxide
(d) Oxygen
Ans: (d)

CDS (I) 2017

116. Date of manufacture of food items fried in oil should be checked before buying because oils become rancid due to

(a)oxidation
(b) reduction
(c) hydrogenation
(d) decrease in viscosity
Ans: (a)

CDS (II) 2015

117. Which of the following solutions will not change the colour of blue litmus paper to red?
1. Acid solution
2. Base solution
3. Common salt solution Select the correct answer using the codes given below

(a)1 and 3
(b) 2 and 3
(c) Only 1
(d) Only 2
Ans: (b)
CDS Exam (II) 2019

118. Which of the following statements is/are correct?
1. Amnion contains fluid.
2. Ultrasound scan can detect the sex of an embryo.
Select the correct answer using the codes given below

(a)Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
Ans: (c)

CDS (II) 2012

119. Addition of ethylene dibromide to petrol

(a)increases the octane number of fuel
(b) helps elimination of lead oxide
(c) removes the sulphur compound in petrol
(d) serves as a substitute of tetraethyl lead
Ans: (b)
CDS Exam (I) 2009

120. In Tritium (T), the number of protons (P) and neutrons (N) respectively are

(a)1 P and 1 N
(b) l P and 2 N
(c) l Pand 3 N
(d) 2 P and l N
Ans: (b)

CDS (II) 2016

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