124. A body is at rest on the surface of the earth. Which one among the
   following statements is correct regarding this? [NDA 2010]
   (a) No force is acting on the body
   (b) Only weight of the body acts on it
   (c) Net downward force is equal to the net upward force
   (d) None of the above statements is correct
Ans: (b)
125. A pendulum beats faster than a standard pendulum. In order to bring it to
   the standard beat, the length of the pendulum is to be: [NDA 2010]
   (a) reduced
   (b) increased
   (c) reduced and the mass of the bob increased
   (d) reduced and also the mass of the bob reduced
Ans: (a)
126. 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 statement given above is/ are correct? [CDS 2010]
   (a) 1 only
   (b) 1 and 2 only
   (c) 3 only
   (d) 1, 2 and 3
Ans: (c)
127. Hair of a shaving brush cling together when the brush is removed from
   water due to [CDS 2010]
   (a) viscosity
   (b) surface tension
   (c) friction
   (d) elasticity