GK in English

GK Chapterwise – CDS Previous Year Papers

Table of Contents

121. Which of the following is a good lubricant ?

(a)Diamond powder
(b) Graphite powder
(c) Molten carbon
(d) Alloy of carbon and iron
Ans: (b)

CDS (I) 2008

122. The main constituent of Gobar gas is

(b) Methane
(c) Propane
(d) Acetylene
Ans: (b)
CDS Exam (I) 2010

123. Bagasse, a by-product of sugar manufacturing industry, is used for the production of

(b) paper
(c) rubber
(d) cement
Ans: (b)

CDS (I) 2015

124. Statement I: During indigestion, milk of magnesia is taken to get rid of pain in the stomach.
Statement II: Milk of magnesia is a base and it neutralizes the excess acid in the stomach.

(a)Both the statements are true and statement II is the correct explanation of statement I
(b) Both the statements are 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 (II) 2011

125. Chromium oxide in paints makes the colour of paint

(b) White
(c) Red
(d) Blue
Ans: (a)

CDS (I) 2013

126. Which of the following is not correct about Baking Soda ?

(a)It is used in soda acid fire extinguisher
(b) It is added for faster cooking.
(c) It is a corrosive base
(d) It neutralizes excess acid in the stomach
Ans: (c)
CDS Exam (I) 2017

127. Which one among the following is an example of chemical change ?

(a)The melting of an ice cube
(b) The boiling of gasoline
(c) The frying of an egg
(d) Attraction of an iron nail to a magnet
Ans: (c)

CDS (I) 2015

128. The form of carbon known as graphite

(a)is harder than diamond
(b) contains a higher percentage of carbon than diamond
(c) is a better electrical conductor than diamond
(d) has equal carbon-to-carbon distances in all directions
Ans: (c)

CDS (II) 2019

129. Which one among the following fuels is used in gas welding?

(a)L P G
(b) Ethylene
(c) Methane
(d) Acetylene
Ans: (d)

CDS (I) 2012

130. Electricity is produced through dry cell from

(a)chemical energy
(b) thermal energy
(c) mechanical energy
(d) nuclear energy
Ans: (a)
CDS Exam (I) 2007

131. A metallic plate sticks firmly on the mouth of a water vessel made from another metal. By way of heating, one can detach the plate from the vessel. This is because heat expands

(a)the vessel only
(b) both the vessel and the plate equally
(c) the vessel more than the plate
(d) the vessel and contracts the plate
Ans: (c)

CDS (I) 2009

132. Which one among the following compounds has same equivalent weight and molecular weight ?

(b) CaCl2 (c) Na2SO4
(d) NaCl
Ans: (d)

CDS (II) 2018

133. When hard water is evaporated completely, the white solid remains in the container. It may be due to the presence of
1. Carbonates of Ca and Mg
2. Sulphates of Ca and Mg
3. Chlorides of Ca and Mg Select the correct answer using the code given below:

(a)1 and 2 only
(b) 1, 2 and 3
(c) 3 only
(d) 1 and 3 only
Ans: (b)
CDS Exam (II) 2016

134. Red phosphorus is used in the manufacture of safety matches. This is due to the fact that

(a)it shows phosphorescence
(b) at ordinary temperature, it is less reactive than other varieties of phosphorus
(c) it cannot be converted to white phosphorus on heating
(d) it does not react with halogen on heating
Ans: (b)
CDS Exam (I) 2008

135. Which one among the following processes is not part of a chemical weathering ?

(b) Exfoliation
(c) Oxidation
(d) Solution
Ans: (b)

CDS (I) 2010

136. Which one among the following metals is prominently used in mobile phone batteries?

(b) Zinc
(c) Nickel
(d) Lithium
Ans: (d)

CDS (II) 2015

137. Match List I with List II and select the correct answer using the code given below the Lists: List I List II
(Air Pollutant) (Effect)
A. Chlorofluorocarbon 1. Acid rain
B. Sulphur dioxide 2. Depletion in ozone layer in the atmosphere
C. Lead compound 3. Harmful for human nervous system
D. Carbon dioxide 4. Topmost contribution to greenhouse effect Code:

(a)4 3 1 2
(b) 4 1 3 2
(c) 2 1 3 4
(d) 2 3 1 4
Ans: (c)
CDS Exam (II) 2011

138. Which one among the following is a micronutrient present in soil for various crops ?

(b) Manganese
(c) Magnesium
(d) Potassium
Ans: (b)

CDS (II) 2013

139. The atomic theory of matter was first proposed by

(a)John Dalton
(b) Rutherford
(c) J. J. Thomson
(d) Niels Bohr
Ans: (a)

CDS (I) 2017

140. Which one of the following is not true for diamond?

(a)Each carbon atom is linked to four other carbon atoms
(b) Three-dimensional network structure of carbon atoms is formed
(c) It is used as an abrasive for sharpening hard tools
(d) It can be used as a lubricant.
Ans: (d)

CDS (II) 2015

DsGuruJi HomepageClick Here