GK in English

GK Chapterwise – CDS Previous Year Papers

Table of Contents

61. Which one among the following is a sin smelling agent added to LPG cylinder to help the detection of gas leakage?

(a)Ethanol
(b) Thioethanol
(c) Methane
(d) Chloroform
Ans: (b)
CDS Exam (II) 2016

62. Heavy water implies

(a)water which is used in heavy industries such as thermal power plants
(b) water which contains SO4 2- and CI– of calcium and magnesium
(c) deuterated water
(d) water which has maximum density
Ans: (c)

CDS (II) 2008

63. When items or jewellery made of metals such as copper or nickel are placed in a solution having a salt of gold, a thin film of gold is deposited by

(a)cooling to below 0°C
(b) heating above 100°C
(c) passing an electric current
(d) just keeping it for 10 min
Ans: (c)

CDS (I) 2010

64. Which one of the following is not needed in a nuclear fission reactor?

(a)Moderator
(b) Coolant
(c) Accelerator
(d) Control device
Ans: (c)
CDS Exam (I) 2015

65. Which one among the following substances evolves heat when dissolved in water?

(a)Potassium nitrate
(b) Sodium chloride
(c) Glucose
(d) Calcium oxide
Ans: (d)
CDS Exam (II) 2011

66. A close bottle containing water at room temperature was taken to the Moon and then the lid is opened. The water will

(a)freeze
(b) boil
(c) decompose into oxygen and hydrogen
(d) not change at all
Ans: (a)

CDS (II) 2013

67. Water is a good coolant and is used to cool the engines of cars, buses, trucks etc. It is because water has a

(a)high specific heat
(b) low surface tension
(c) high boiling point
(d) teflon
Ans: (a)

CDS (I) 2017

68. Contact lenses are made from

(a)polyvinyl chloride
(b) polystyrene
(c) lucite
(d) teflon
Ans: (c)
CDS Exam (I) 2015

69. Which one among the following metals is used for making boats because it does not corrode by sea water?

(a)Tungsten
(b) Nickel
(c) Antimony
(d) Titanium
Ans: (d)

CDS (I) 2019

70. Sodium thiosulphate (Na2S2O3) solution is used in photography to

(a)remove reduced silver
(b) reduce silver bromide (AgBr) grain to silver
(c) remove undecomposed AgBr as a soluble silver thiosulphate complex
(d) convert the metallic silver to silver salt
Ans: (c)

CDS (II) 2012

71. Sacrificial anode protects iron or ships, underground pipelines etc from rusting, a process known as cathodic protection. Which one of the following metals cannot be used as a sacrificial anode?

(a)Tin
(b) Zinc
(c) Magnesium
(d) Aluminium
Ans: (a)

CDS (I) 2007

72. One of the occupational health hazards commonly faced by the workers of ceramics, pottery and glass industry is

(a)stone formation in gall bladder
(b) melanoma
(c) silicosis
(d) stone formation in kidney
Ans: (c)
CDS Exam (I) 2009

73. Match List I with List II and select the correct answer using the codes given below the lists.
Lis t I Lis t II
(Acid) (Source)
A. Lactic acid 1 Tamarind
B. Tartaric acid 2 Orange
C. Oxalic acid 3 Tomato
D. Citric acid 4 Sour curd Codes A B C D A B C D

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

CDS (I) 2018

74. Which one among the following would expand the most on being heated.

(a)water
(b) Alcohol
(c) Glass
(d) Air
Ans: (d)

CDS (II) 2016

75. Which one among the following will you put into pure water in order to pass electric current through it?

(a)Kerosene (c) Mustard oil
(c) Lemon juice
(d) Sugar
Ans: (c)

CDS (I) 2008

76. Gypsum (CaSO4 . 2H2O) is added to clinker during cement manufacturing to

(a)decrease the rate of setting of cement
(b) bind the particles of calcium silicate
(c) facilitate the formation of colloidal gel
(d) impart strength to cement
Ans: (a)
CDS Exam (I) 2010

77. Statement I: All liquids are conductors of electricity.
Statement II: Under the condition of low pressure and high voltage, liquids can be made conducting.

(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: (d)

CDS (I) 2015

78. Statement I: On mixing with water, plaster of Paris hardens.
Statement II: By combining with water, plaster of Paris is converted into gypsum. CaS04 -2Hp Gypsum

(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 (II) 2011

79. Statement I: Oxides of sulphur and nitrogen present in high concentration in air are dissolved in rain drops.
Statement II: Oxyacids of sulphur and nitrogen make rain water acidic.

(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 Exam (II) 2013

80. Vermicompost is an/a

(a)inorganic fertilizer
(b) toxic substance
(c) organic bio fertilizer
(d) synthetic fertilizer
Ans: (c)
CDS Exam (I) 2017

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