GK in English

GK Chapterwise – CDS Previous Year Papers

Table of Contents

101. A person standing 1 m in front of a plane mirror approaches the mirror by 40 cm. The new distance between the person and his image in the plane mirror is

(a)60 cm
(b) 1.2 m
(c) 1.4 m
(d) 2.0 m
Ans: (b)

CDS (II) 2015

102. In an observation, a-particles, b-particles and g-rays have same energies. Their penetrating power in a given medium in increasing order will be

(a)a, b, g
(b) b, g, a
(c) a, g, b
(d) b, a, g
Ans: (a)

CDS (I) 2019

103. Sodium metal should be stored in

(a)Alcohol
(b) Kerosene oil
(c) Water
(d) Hydrochloric acid
Ans: (b)

CDS (II) 2012

104. Which one among the following is used in making lead pencils ?

(a)Charcoal
(b) Graphite
(c) Coke
(d) Carbon black
Ans: (b)
CDS Exam (II) 2007

105. A wire-bound standard resistor used manganin or constantan. It is because

(a)these alloys are cheap and easily available
(b) they have high resistivity
(c) they have low resistivity
(d) they have resistivity which almost remains unchanged with temperature
Ans: (d)

CDS (II) 2009

106. Two pieces of conductor of same material and of equal length are connected in series with a cell. One of the two pieces has cross-sectional area double that of the other. Which one of the following statements is correct in this regard ?

(a)The thicker one will allow stronger current to pass through it.
(b) The thinner one would allow stronger current to pass through it.
(c) Same amount of electric current would pass through both the pieces producing more heat in the thicker one.
(d) Same amount of electric current would pass through both the pieces producing more heat in the thinner one.
Ans: (d)

CDS (I) 2018

107. An object is raised to a height of 3 m from the ground. It is then allowed to fall on to a table 1 m high from ground level.
In this context, which one among the following statements is correct ?

(a)Its potential energy decreases by two-thirds its original value of total energy.
(b) Its potential energy decreases by one-third its original value of total energy.
(c) Its kinetic energy increases by two-thirds, while potential energy increases by one-third.
(d) Its kinetic energy increases by one-third, while potential energy decreases by one-third.
Ans: (a)
CDS Exam (I) 2016

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

(a)Weight of a body is different on different planets.
(b) Mass of a body on the earth, on the moon and in empty space is the same.
(c) Weightlessness of a body occurs when the gravitational forces acting on it are counter-balanced.
(d) Weight and mass of a body are equal at sea level on the surface of the earth.
Ans: (d)
CDS Exam (II) 2008

109. Newton’s laws of motion do not hold good for objects

(a)at rest
(b) moving slowly
(c) moving with high velocity
(d) moving with velocity comparable to velocity of light
Ans: (d)

CDS (II) 2010

110. The focal length of the lens of a normal human eye is about

(a)25 cm
(b) 1 m
(c) 2.5 mm
(d) 2.5 cm
Ans: (a)

CDS (I) 2015

111. X-rays are

(a)deflected by an electric field but not by a magnetic field
(b) deflected by a magnetic field but not by an electric field
(c) deflected by both a magnetic field and an electric field
(d) not deflected by an electric field or a magnetic field
Ans: (d)
CDS Exam (I) 2011

112. A body is falling freely under the action of gravity alone in vacuum. Which one of the following remains constant during the fall?

(a)Potential energy
(b) Kinetic energy
(c) Total linear momentum
(d) Total mechanical energy
Ans: (d)

CDS (I) 2013

113. Which one of the following statements about bar magnet is correct ?

(a)The pole strength of the north-pole of a bar magnet is larger than that of the south-pole
(b) When a piece of bar magnet is bisected perpendicular to its axis, the north and south pole get separated
(c) When a piece of bar magnet is bisected perpendicular to its axis two new bar magnets are formed
(d) The poles of a bar magnet are unequal in magnitude and opposite in nature
Ans: (c)

CDS (II) 2017

114. A myopic person has a power of 1.25 dioptre, what is the focal length and nature of his lens ?

(a)50 cm and convex lens
(b) 80 cm and convex lens
(c) 50 cm and concave lens
(d) 80 cm and concave lens
Ans: (d)

CDS (I) 2015

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

(a)Sounds wave in gases are longitudinal in nature
(b) Sounds wave having frequency below 20 Hz are known as ultrasonic waves
(c) Sounds waves having higher amplitudes are louder
(d) Sound waves with high audible frequencies are sharp
Ans: (b)
CDS Exam (I) 2019

116. The outside rearview mirror of modern automobiles is marked with warning “objects in mirror are closer than they appear”.
Such mirrors are

(a)plane mirrors
(b) concave mirrors with very large focal lengths
(c) concave mirrors with very small focal lengths
(d) convex mirrors
Ans: (d)

CDS (I) 2012

117. A brick is thrown vertically from an aircraft flying two kilometres above the earth. The brick will fall with a

(a)constant speed
(b) constant velocity
(c) constant acceleration
(d) constant speed for some time then with constant acceleration as it nears the earth
Ans: (c)

CDS (II) 2007

118. In a bipolar junction transistor

(a)all the three regions (the emitter, , the base and the collector) have equal concentrations of impurity
(b) the emitter has the least concentration of impurity
(c) the collector has the least concentration of impurity
(d) the base has the least concentration of impurity
Ans: (a)

CDS (I) 2009

119. The spring constant of a spring depends on its

(a)length only
(b) material only
(c) length and its diameter
(d) thickness, its diameter and its material
Ans: (d)
CDS Exam (I) 2018

120. The SI unit of mechanical power is:

(a)Joule
(b) Watt
(c) Newton-Second
(d) Joule-Second
Ans: (b)

CDS (I) 2016

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