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GK Chapterwise – CDS Previous Year Papers

Table of Contents

141. Which one of the following statement is not correct?

(a)Water starts boiling when its vapour pressure becomes equal to atmospheric pressure.
(b) Water is known as universal solvent.
(c) Permanent hardness of water is due to presence of MgCl2, CaCl2, MgSO4 and CaSO4.
(d) Density of ice is greater than that of water.
Ans: (d)
CDS Exam (II) 2019

142. Which of the following is not gaseous air pollutant?

(a)Oxides of Sulphur
(b) Oxides of nitrogen
(c) Hydrocarbon
(d) Smoke
Ans: (c)

CDS (II) 2012

143. Match List-I with List-II and select the correct answer using the code given below the Lists: List-I List-II
(Exponent) (Law)
A. John Dalton 1. Law of definite proportion by volume
B. Joseph Proust 2. Law of multiple proportion
C. Antoine Lavoisier 3. Law of definite proportion by weight
D. Joseph Louis Gay- 4. Law of conservation Lussac of mass Code:
A B C D

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

CDS (I) 2007

144. Which one of the following statements is not correct ?

(a)Hydrogen is an element
(b) Hydrogen is the lightest element
(c) Hydrogen has no isotopes
(d) Hydrogen and oxygen form an explosive mixture
Ans: (c)

CDS (II) 2009

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

(a)Burning of paper
(b) Magnetization of soft iron
(c) Dissolution of cane sugar in water
(d) Preparation of ice cubes from water
Ans: (a)
CDS Exam (II) 2018

146. A piece of ice, 100 g in mass is kept at 0°C. The amount of heat is requires to melt at 0°C is (take latent heat of melting of ice to be 333.6 j / g):

(a)750.6 J
(b) 83.4 J
(c) 33360 J
(d) 3.336 J
Ans: (c)

CDS (II) 2016

147. Which one of the following statements is correct? The velocity of sound:

(a)Does not depend upon the nature of media
(b) is maximum in gases and minimum in liquids
(c) is maximum in solids and minimum in liquids
(d) is maximum in solids and minimum in gases
Ans: (d)

CDS (I) 2008

148. Which one of the following physical quantities is the same for molecules of all gases at a given temperature?

(a)Speed
(b) Mass
(c) Kinetic energy
(d) Momentum
Ans: (c)
CDS Exam (I) 2010

149. Two systems are said to be in thermal equilibrium if and only if:

(a)there can be a heat flow between them even if they are at different temperatures
(b) there cannot be a heat flow between them even if they are at different temperatures
(c) there is no heat flow between them
(d) their temperatures are slightly different
Ans: (c)
CDS Exam (II) 2015

150. Methyl lsocyanate gas, which was involved in the disaster in Bhopal in December 1984, was used in the Union Carbide factory for production of:

(a)Dyes
(b) Detergents
(c) Explosives
(d) Pesticides
Ans: (d)

CDS (II) 2011

151. The handle of pressure cookers is made of plastic because it should be made non-conductor of heat. The plastic used there is the first man-made plastic, which is:

(a)Polythene
(b) Terylene
(c) Nylon
(d) Bakelite
Ans: (d)

CDS (I) 2013

152. The synthetic rubber has replaced natural rubber for domestic and industrial purposes. Which one of the following is the main reason behind that?

(a)Natural rubber is unable to meet the growing demand of different industries
(b) Natural rubber is grown in tropical countries only
(c) Raw material for synthetic rubber is easily available
(d) Nutural rubber is not durable
Ans: (c)
CDS Exam (I) 2017

153. Which one of the following statements is not correct ?

(a)Atoms of different elements may have same mass numbers
(b) Atoms of an element may have different mass numbers
(c) All the atoms of an element have same number of protons
(d) All the atoms of an element will always have same number of neutrons.
Ans: (c)

CDS (I) 2015

154. Excessive use of which of the following fertilizers may be responsible for the presence of a toxic substance in groundwater?

(a)Nitrogen
(b) Phosphate only
(c) Potassium only
(d) Phosphate and potassium
Ans: (a)

CDS (II) 2019

155. Dolomite powder is applied in some agricultural lands. The purpose of applying it is to

(a)increase the pH of the soil
(c) lower the pH of the soil
(c) increase the phosphorus content of the soil
(d) increase the nitrogen content of the soil
Ans: (a)

CDS (I) 2012

156. In paper manufacturing, degumming of the raw material is done using

(a)sulphuric acid
(b) bleaching powder
(c) caustic soda
(d) nitric acid
Ans: (b)
CDS Exam (I) 2007

157. Which one of the following is not an allotrope of carbon?

(a)Coal
(b) Diamond
(c) Graphite
(d) Graphene
Ans: (d)

CDS (I) 2009

158. German silver is used to make decorative articles, coinage metal, ornaments, The name is given because:

(a)it is an alloy of copper and contains silver as one of its components
(b) Germans were the first to use silver
(c) Its appearance is like silver
(d) It is an alloy of silver
Ans: (c)

CDS (II) 2018

159. In case of a standard hydrogen electrode

(a)absolute electrode potential is not zero
(b) absolute electrode potential is zero
(c) both absolute and standard electrode potential values are zero
(d) electrode potential is zero only at 25°C
Ans: (d)

CDS (I) 2016

160. Which one of the following statements is correct?

(a)The oxidation number for hydrogen is always zero.
(b) The oxidation number for hydrogen is always +1.
(c) The oxidation number for hydrogen is always -1.
(d) Hydrogen can have more than one oxidation number.
Ans: (d)
CDS Exam (I) 2008

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