GK in English

GK Chapterwise – CDS Previous Year Papers

Table of Contents

161. Match List-I with List-II and select the correct answer using the code given below the Lists: List-I List-II
(Element) (Property/ Use}
A. Mg 1. Gives red colour to flame
B. Ca 2. Sulphate compound used in medicine to examine the alimentary canal of a patient
C. Sr 3. Traps the energy of sunlight in photosynthesis
D. Ba 4. Control of muscle contraction Code:

(a)A B C D 2 4 l 3
(b) A B C D 2 l 4 3
(c) A B C D 3 4 1 2
(d) A B C D 3 l 4 2
Ans: (c)

CDS (I) 2010

162. In the gamma decay of a nucleus

(a)the mass number of the nucleus changes whereas its atomic number does not change
(b) the mass number of the nucleus does not change whereas its atomic number changes
(c) both the mass number and the atomic number of the nucleus change
(d) neither the mass number nor the atomic number of the nucleus changes
Ans: (d)

CDS (II) 2015

163. Which one of the following elements does not form solid hydrogen carbonate?

(b) Potassium
(c) Caesium
(d) Lithium
Ans: (d)
CDS Exam (II) 2011

164. ‘Plum Pudding Model’ for an atom was proposed by

(a)Antoine Lavoisier
(b) Robert Boyle
(c) Ernest Rutherford
(d) J. J. Thomson
Ans: (d)
CDS Exam (I) 2013

165. There are two elements-calcium (atomic number 20) and argon (atomic number 18). The mass number of both the elements is 40. They are therefore known as

(b) isochores
(c) isobars
(d) isotopes
Ans: (c)

CDS (I) 2017

166. Which one of the following is the most characteristic property of an element?

(b) Boiling point
(c) Mass number
(d) Atomic number
Ans: (d)

CDS (II) 2015

167. The pH value of a sample of multiple-distilled water is

(b) 14
(c) very near to zero
(d) very near to seven
Ans: (d)
CDS Exam (II) 2019

168. Which one of the following is a physical change?

(a)Burning of coal
(b) Burning of wood
(c) Heating of a platinum crucible
(d) Heating of potassium chlorate
Ans: (c)

CDS (II) 2012

169. Pearl is a hard object produced within the soft tissues of a mollusk. Which one of the following is the main constituent of pearl?

(a)Calcium carbonate
(b) Calcium oxide
(c) Calcium nitrate
(d) Calcium sulphate
Ans: (a)

CDS (I) 2007

170. The molecular mass of sulphuric acid is 98. If 49 g of the acid is dissolved in water to make one litre of solution, what will be the strength of the acid?

(a)Two normal
(b) One normal
(c) 0.5 normal
(d) Four normal
Ans: (b)

CDS (II) 2009

171. The chemical properties of an element depend upon

(a)the number of isotopes of the element
(b) the mass number of the element
(c) the total number of neutrons in the element
(d) the number of electrons in the outermost shell of the element
Ans: (d)
CDS Exam (II) 2018

172. What is the maximum number of states of matter?

(b) Four
(c) Five
(d) Variable
Ans: (c)

CDS (II) 2016

173. What is the number of atoms in 46 g of sodium-23 [N = Avogadro constant)?

(b) N
(c) 2N
(d) 23N
Ans: (c)

CDS (I) 2008

174. An emulsion consists of

(a)one liquid and one solid
(b) one liquid and one gas
(c) two liquids
(d) two solids
Ans: (c)

CDS (II) 2010

175. The paste of a white material in water is used to maintain a fractured bone fixed in place. The white material used is called

(a)bleaching powder
(b) plaster of Paris
(c) powder of zinc oxide
(d) lime powder
Ans: (b)
CDS Exam (II) 2015

176. How many hydrogen atoms are contained in 1.50 g of glucose (C6H12O6)?

(a)3.01 × 1022
(b) 1.20 × 1023
(c) 2.40 × 1023
(d) 6.02 × 1022
Ans: (d)

CDS (II) 2011

177. An electron and a proton starting from rest are accelerated through a potential difference of 1000 V. Which one of the following statements in this regard is correct?

(a)The kinetic energy of both the particles will be different.
(b) The speed of the electron will be higher than that of the proton.
(c) The speed of the proton will be higher than that of the electron.
(d) The speed of the electron and the proton will be equal.
Ans: (b)
CDS Exam (I) 2017

178. Which one of the following gases dissolves in water to give acidic solution?

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

CDS (II) 2019

179. Tincture of iodine is an antiseptic for fresh wounds. It is a dilute solution of elemental iodine, which does not contain

(b) acetone
(c) alcohol
(d) potassium iodide
Ans: (b)

CDS (I) 2012

180. Which of the following radioactive substances enters/enter the human body through food chain and causes/cause many physiological disorders?

(b) Iodine-131
(c) Cesium-137
(d) All of the above
Ans: (d)

CDS (I) 2009

DsGuruJi HomepageClick Here