GK in English

GK Chapterwise – CDS Previous Year Papers

Table of Contents

41. Which one of the following is associated with the formation of brown air in traffic congested cities?

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

CDS (I) 2011

42. Which one of the following chemicals is commonly used by farmers to destroy weeds?

(a)DDT
(b) Malathion
(c) Methyl bromide
(d) 2, 4-D
Ans: (d)

CDS (II) 2013

43. If a limestone piece is dipped in water, a bubble evolves.
The bubbling is due to

(a)hydrogen
(b) oxygen
(c) water vapour
(d) carbon dioxide
Ans: (c)

CDS (I) 2017

44. Which among the following elements is abundant on the lunar surface and holds the potential to put an end to the energy crisis of the earth?

(a)Helium-I
(b) Helium-ll
(c) Helium-Ill
(d) Helium-IV
Ans: (a)
CDS Exam (I) 2015

45. The coil in a heater is made of

(a)nichrome
(b) tungsten
(c) copper
(d) iron
Ans: (c)

CDS (I) 2019

46. Which one of the following polymeric materials is used for making bullet proof jacket?

(a)Nylon-6, 6
(b) Rayon
(c) Kevlar
(d) Dacron
Ans: (b)

CDS (II) 2012

47. The cleaning of dirty clothes by soaps and detergents is due to a type of molecules called surfactants, which are present in soaps and detergents. The surfactant molecules remove the dirt by

(a)making the cloth slippery
(b) producing some gases between the dirt and the cloth
(c) dissolving the dirt
(d) forming some aggregates of themselves and take away the dirt in the core of the aggregates
Ans: (c)

CDS (I) 2007

48. The polymeric fibre used as a substitute for wool in making synthetic blankets, sweaters, etc., is

(a)nylon
(b) teflon
(c) orlon
(d) bakelite
Ans: (b)
CDS Exam (I) 2009

49. Match List I with List II and select the correct answer using the codes given below the Lists. List I List II
(Alloy) (Constituent)
A. Solder 1 Iron and carbon
B. Brass 2 Copper and zinc
C. Bronze 3 Copper and tin
D. Steel 4 Lead and tin Codes A B C D A B C D

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

CDS (I) 2018

50. Match List I with List II and select the correct answer using the codes given below the Lists. Lis t I Lis t II
(Item) (Toxic subs tance)
A. CFL lamp 1 Nitrogen oxides
B. Automobile battery 2 Phthalates
C. Polymer 3 Lead
D. Diesel engine 4 Mercury Codes A B C D A B C D

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

CDS (II) 2016

51. Some statements about the benefits of organic farming are given below. Indicate whether they are true or false using the codes given below the statements:
1. It reduces CO2 emission.
2. It does not lead to toxic effect.
3. It improves the water-retention capacity of the soil.
Codes

(a)1 2 3 False True False
(b) 1 2 3 True False False
(c) 1 2 3 False True True
(d) 1 2 3 False True True
Ans: (d)
CDS Exam (II) 2008

52. A woman desires to clean the surface of her gold ornaments by a chemical approach. For this she requires to use

(a)aqua-regia
(b) concentrated H2SO4 (c) concentrated NaOH
(d) sodium thiosulphate solution
Ans: (a)
CDS Exam (I) 2010

53. Which one among the following has been producing/can produce light by a chemical change?

(a)Sun
(b) Moon
(c) Electric bulb
(d) Lightning and thunder
Ans: (b)

CDS (I) 2015

54. Consider the following statements regarding the properties and uses of glass wool.
I. Glass wool has tensile strength greater than steel.
II. Glass wool is fire proof.
III. Glass wool has high electrical conductivity and absorbs moisture.
IV. Glass wool is used to prepare fibre glass.
Which of the statements given above are correct?

(a)I and II
(b) I, II and IV
(c) II and IV
(d) I, III and IV
Ans: (c)

CDS (II) 2011

55. Which one of the following reducing agents can also act as an oxidising agent?

(a)H2
(b) H2S
(c) SO2
(d) HI
Ans: (c)
CDS Exam (II) 2013

56. Which one of the following is not a mixture?

(a)Tootpaste
(b) Toilet soap
(c) Baking soda
(d) Vinegar
Ans: (d)

CDS (II) 2017

57. Scuba divers are at risk due to high concentration of dissolved gases while breathing air at high pressure under water. The tanks used by Scuba divers are filled with

(a)air diluted with helium
(b) O2 (c) N2
(d) a mixture of N2 and helium
Ans: (a)

CDS (I) 2015

58. Which one of the following is not a periodic property i.e., does not show any trend on moving from one side to the other in the periodic table?

(a)Atomic size
(b) Valency
(c) Radioactivity
(d) Electronegativity
Ans: (c)
CDS Exam (II) 2012

59. Statement I: Superphosphate of lime can be assimilated by plants. Statement II: Superphosphate of lime is soluble in water.

(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) 2007

60. A body is charged negatively. It implies that

(a)it has lost some of its protons
(b) it has acquired some electrons from outside
(c) it has lost some of its electrons
(d) None of the above
Ans: (b)

CDS (II) 2018

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