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GK Chapterwise – CDS Previous Year Papers

Table of Contents

21. The most familiar form of radiant energy in sunlight that causes tanning and sunburning of human skin, is called

(a)ultraviolet radiation
(b) visible radiation
(c) infrared radiation
(d) microwave radiation
Ans: (a)
CDS Exam (II) 2010

22. Consider the following statements
1. Clear sky appears blue due to poor scattering of blue wavelength of visible light.
2. Red part of light shows more scattering than blue light in the atmosphere.
3. In the absence of atmosphere, there would be no scattering of light and sky will look black.
Which of the statements given above is/are correct?

(a)Only 1
(b) 1 and 2
(c) Only 3
(d) All of these
Ans: (c)

CDS (II) 2015

23. Hair of a shaving brush cling together when the brush is removed from water due to

(a)viscosity
(b) surface tension
(c) friction
(d) elasticity
Ans: (b)

CDS (I) 2011

24. Which one of the following is not result of surface tension?

(a)Vapour formation above the liquid surface
(b) Convex shape of liquid meniscus
(c) Liquid rising in a capillary
(d) Spherical shape of mercury fallen on the floor
Ans: (a)
CDS Exam (I) 2013

25. Fat can be separated from milk in a cream separation because of

(a)cohesive force
(b) gravitational force
(c) centrifugal force
(d) centripetal force
Ans: (c)

CDS (I) 2017

26. The apparent weight of a steel sphere immersed in various liquids is measured using a spring balance. The greatest reading is obtained for the liquid

(a)having the smallest density
(b) having the largest density
(c) in which the sphere was submerged deepest
(d) having the greatest volume
Ans: (a)

CDS (II) 2015

27. Raw mangoes shrivel when pickled in brine. The phenomenon is associated with

(a)osmosis
(b) reverse osmosis
(c) increase of surface tension of fluid
(d) decrease of surface tension of fluid
Ans: (a)

CDS (I) 2019

28. A diffraction pattern is obtained using a beam of red light.
Which one among the following will be the outcome, if the red light is replaced by blue light?

(a)Bands disappear
(b) Diffraction pattern becomes broader and further apart
(c) Diffraction pattern becomes narrower and crowded together
(d) No change
Ans: (c)
CDS Exam (I) 2012

29. Which one of the following statement is true?

(a)Temperatures differing 25° on the fahrenheit (F) scale must differ by 45° on the celsius (C) scale
(b) 0°F corresponds to – 32°C
(c) Temperatures which differ by 10° on the celsius scale must differ by 18° on the Fahrenheit scale
(d) Water at 90°C is warmer than water at 202°F
Ans: (c)

CDS (I) 2007

30. A boy throws four stones of same shape, size and weight with equal speed at different initial angles with the horizontal line. If the angles are 15°, 30°, 45° and 60°, at which angle the stone will cover the maximum horizontally?

(a)15°
(b) 30°
(c) 45°
(d) 60°
Ans: (c)

CDS (II) 2009

31. As the sunlight passes through the atmosphere, the rays are scattered by tiny particles of dust, pollen, soot and other minute particulate matters present there. However, when we look up, the sky appears blue during mid-day because

(a)blue light is scattered most
(b) blue light is absorbed most
(c) blue light is reflected most
(d) ultraviolet and yellow component of sunlight combine
Ans: (a)

CDS (I) 2018

32. A passenger in a moving train tosses a five rupee coin. If the coin falls behind him, then the train must be moving with a uniform

(a)acceleration
(b) deceleration
(c) speed
(d) velocity
Ans: (a)
CDS Exam (I) 2016

33. The pressure exerted on the ground by a man is greatest

(a)when the lies down in the ground
(b) when the stands on the toes of one foot
(c) when the stands with both foot flat on the ground
(d) all of the above yield the same pressure
Ans: (b)

CDS (I) 2008

34. An athlete diving off a high springboard can perform a variety of exercises in the air before entering the water below. Which one of the following parameters will remain constant during the fall?

(a)The athlete’s linear momentum
(b) The athlete’s moment of inertia
(c) The athlete’s kinetic energy
(d) The athlete’s angular momentum
Ans: (d)

CDS (II) 2010

35. If an object having mass of 1 kg is subjected to a force of 1 N it moves with

(a)a speed of 1 m/s
(b) a speed of 1 km/s
(c) an acceleration of 10 m/s2
(d) an acceleration of 1 m/s2
Ans: (d)
CDS Exam (II) 2015

36. In scuba-diving, while ascending towards the water surface, there is a danger of bursting the lungs. It is because of

(a)Archimedes’ principle
(b) Boyle’s law
(c) Gay-Lussac’s law of combining volumes
(d) Graham’s law of diffusion
Ans: (b)
CDS Exam (I) 2011

37. Half portion of a rectangular piece of ice is wrapped with a white piece of cloth while the other half with a black one. In this context, which one among the following statements is correct?

(a)Ice melts more easily under black wrap
(b) Ice melts more easily under white wrap
(c) No ice melts at all under the black wrap
(d) No ice melts at all under the white wrap
Ans: (a)

CDS (I) 2013

38. Why are inner lining of hot water geysers made up of copper?

(a)Copper has low heat capacity
(b) Copper has high electrical conductivity
(c) Copper does not react with steam
(d) Copper is good conductor of both heat and electricity
Ans: (d)

CDS (II) 2017

39. Which one of the following statements is correct?

(a)The angle of contact of water with glass is acute while that of mercury with glass is obtuse
(b) The angle of contact of water with glass is obtuse, while that of mercury with glass is acute
(c) Both the angle of contact of water with glass and that of mercury with glass are acute
(d) None of the above
Ans: (a)
CDS Exam (II) 2015

40. The force acting on a particle executing simple harmonic motion is

(a)directly proportional to the displacement and is directed away from the mean position
(b) inversely proportional to the displacement and is directed towards the mean position
(c) directly proportional to the displacement and is directed towards the mean position
(d) inversely proportional to the displacement and is directed away from the mean position
Ans: (c)

CDS (II) 2019

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