(c) Two blankets compress the air in between the body and the blankets and this compression produces that
       (d) None of the above
Ans : (b)
135. The sun is visible a little before it rises on the horizon and a little after it sets below the horizon. This is a consequence of the
     phenomenon of: [GIC AAO 1989]
       (a) refraction
       (b) total internal reflection
       (c) dispersion
       (d) scattering of sun"s light
Ans : (b)
136. Which one of the following statements is correct? [NDA 2010]
       (a) Only electrons reside inside the nucleus of an atom
       (b) Both electrons and protons reside inside the nucleus of an atom
       (c) Only neutrons reside inside the nucleus of an atom
       (d) Both protons and neutrons can reside inside the nucleus of an atom
Ans : (d)
137. Which one of the following pairs of rays is electromagnetic in nature? [NDA 2010]
       (a) Beta rays and gamma rays
       (b) Cathode rays and X-rays
       (c) Alpha rays and beta rays
       (d) X-rays and gamma rays
Ans : (d)
138. A glass tumbler containing ice shows droplets of water on the outer surface because: [RRB 1993]
       (a) the outer surface of the tumbler shows hygroscopic effect
       (b) water from inside oozes out through the wall of the tumbler
       (c) the moisture in the air on coming in contact with the cold surface of the tumbler condenses into water droplets
       (d) Both (a) and (b)
Ans : (c)
139. Burns caused by steam are much more severe than those caused by boiling water as: [CB11991)
       (a) steam is a gas and engulfs the body quickly
       (b) temperature of steam is higher
       (c) steam pierces through the pores of body quickly
       (d) steam has latent heat
Ans : (d)
140. Sodium thiosulphate is used in photography because: [lFS 1989)
       (a) it is an oxidising agent
       (b) it is a reducing agent
       (c) it reacts with light
       (d) it helps in fixing the photograph
Ans : (d)
141. On which of the following factors does the temperature of steam in a pressure cooker depend? [NDA 1993]
       (a) Material of which cooker is made
       (b) Temperature of the flame
       (c) Quantity of cooking material