GK in English

GK Chapterwise – CDS Previous Year Papers

Table of Contents

41. The cat can survive fall from a height much more than human or any other animal. It is because the cat

(a)can immediately adjust itself to land on all four paws and bend the legs to absorb the impact of falling
(b) has elastic bones
(c) has thick and elastic skin
(d) also gets injury equally with other animals, but has tremendous endurance, resistance and speedy recovery
Ans: (a)

CDS (I) 2012

42. Viewfinders, used in automobiles to locate the position of the vehicles behind, are made of

(a)plane mirror
(b) concave mirror
(c) convex mirror
(d) parabolic mirror
Ans: (c)

CDS (II) 2007

43. If a ship moves from freshwater into seawater, it will

(a)sink completely
(b) sink a little bit
(c) rise a little higher
(d) remain unaffected
Ans: (c)
CDS Exam (II) 2009

44. Mr X was advised by an architect to make outer walls of his house with hollow bricks. The correct reason is that such walls

(a)make the building stronger
(b) help keeping inside cooler in summer and warmer in winter
(c) prevent seepage of moisture from outside
(d) protect the building from lightning
Ans: (b)

CDS (II) 2018

45. The blackboard seems black because it

(a)reflects every colour
(b) does not reflect any colour
(c) absorbs black colour
(d) reflects black colour
Ans: (b)

CDS (I) 2016

46. If the door of a running refrigerator in a closed room is kept open, what will be the net effect on the room?

(a)It will cool the room
(b) It will heat the room
(c) It will make no difference on the average
(d) It will make the temperature go up and down
Ans: (b)

CDS (II) 2008

47. A body has a mass of 6 kg on the Earth; when measured on the Moon, its mass would be

(a)nearly 1 kg
(b) less than 1 kg
(c) less than 6 kg
(d) 6 kg
Ans: (d)

CDS (II) 2015

48. Transformer is a kind of appliance that can
1. increase power
2. increase voltage
3. decrease voltage
4. measure current and voltage Select the correct answer using the codes given below

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

CDS (I) 2011

49. Fire fly gives us cold light by virtue of the phenomenon of

(b) phosphorescence
(c) chemiluminescence
(d) effervescence
Ans: (c)
CDS Exam (I) 2013

50. In SONAR, we use

(a)ultrasonic waves
(b) infrasonic waves
(c) radio waves
(d) audible sound waves
Ans: (a)
CDS Exam (II) 2017

51. A liquid is kept in a regular cylindrical vessel upto a certain height. If this vessel is replaced by another cylindrical vessel having half the area of cross-section of the bottom, the pressure on the bottom will

(a)remain unaffected
(b) be reduced to half the earlier pressure
(c) be increased to twice the earlier pressure
(d) be reduced to one-fourth the earlier pressure
Ans: (a)

CDS (II) 2015

52. The time period of a simple pendulum having a spherical wooden bob is 2 s. If the bob is replaced by a metallic one twice as heavy, the time period will be

(a)more than 2 s
(b) 2s
(c) 1 s
(d) less than 1 s
Ans: (b)

CDS (I) 2019

53. When you pull out the plug connected to an electrical appliance, you often observe a spark. To which property of the appliance is this related?

(b) Inductance
(c) Capacitance
(d) Wattage
Ans: (a)
CDS Exam (I) 2012

54. The focal length of convex lens is

(a)the same for all colours
(b) shorter for blue light than for red
(c) shorter for red light than for blue
(d) maximum for yellow light
Ans: (b)

CDS (I) 2007

55. The best colours for a sun umbrella will be

(a)black on top and red on inside
(b) black on top and white on inside
(c) red on top and black on inside
(d) white on top and black on inside
Ans: (d)

CDS (II) 2009

56. Before X-ray examination (coloured X-ray) of the stomach, patients are given suitable salt of barium because

(a)barium salts are white in colour and this helps stomach to appear clearly
(b) barium is a good absorber of X-rays and helps stomach to appear clearly
(c) barium salts are easily available
(d) barium allows X-rays to pass through the stomach
Ans: (b)

CDS (I) 2018

57. Which one among the following correctly defines a unit magnetic pole in SI units? It is the pole which when placed in air at a distance of

(a)1 foot from an equal and a similar poled repels it with a force of 1 pound
(b) 1 m from an equal and a similar pole repels it with a force of 1 N
(c) 1 cm from an equal and a similar pole repels it with a force of 1 dyne
(d) 1 metre from an equal and a similar pole repels it with a force of 1 N/m2
Ans: (b)
CDS Exam (I) 2016

58. After rising a short distance the smooth column of smoke from a cigarette breaks up into an irregular and random pattern. In a similar fashion, a stream of fluid flowing past an obstacle breaks up into eddies and vortices which give the flow irregular velocity components transverse to the flow direction. Other examples include the wakes left in water by moving ships the sound produced by whistling and by wind instruments. These examples are the results of

(a)laminar flow of air
(b) streamline flow of air
(c) turbulent flow of air
(d) viscous flow at low speed
Ans: (c)

CDS (I) 2008

59. Two identical piano wires have same fundamental frequency when kept under the same tension.
What will happen if tension of one of the wire is slightly increased and both the wires are made to vibrate simultaneously?

(b) Beats
(c) Resonance
(d) Non-linear effects
Ans: (b)

CDS (II) 2010

60. It is difficult to cut things with a blunt knife because

(a)the pressure exerted by knife for a given force increases with increase in bluntness
(b) a sharp edge decreases the pressure exerted by knife for a given force
(c) a blunt knife decreases the pressure for a given force
(d) a blunt knife decreases the area of intersection
Ans: (c)

CDS (I) 2015

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