(c) directly proportional to the velocity and is directed away from the mean
   (d) inversely proportional to the velocity and is directed towards the mean
Ans: (b)
140. As the sunlight passes through the atmosphere, the rays are scattered by
   tiny particles of dust, pollen, soot and other minute particular matters present
   there. However, when we look up, the sky appears blue during mid-day,
   because [CDS 2010]
   (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)
141. 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 [CDS 2010]
   (a) acceleration
   (b) deceleration
   (c) speed
   (d) velocity
Ans: (d)
142. Non-metals are bad conductors of electricity because:
   (a) they lack free or mobile electrons
   (b) they have light atoms
   (c) they have high melting points
   (d) All of these
Ans: (a)
143. An object weights the maximum in: [JPSC (Pre) 2011]
   (a) air
   (b) water
   (c) hydrogen
   (d) vacuum