2311: Who amongst the following was the first to state that the Earth was spherical?
(a) Aristotle
(b) Copernicus
(c) Ptolemy
(d) Strabo
2312: Who among the following was not sent to Lanka for the propagation of Buddhism?
(a) Rashtriya
(b) Bhadrasaro
(c) Uttriya
(d) Sona
2313: Which one of the following polymers is widely used for making bullet proof material ?
(a) Polyvinyl chloride
(b) Polyamides
(c) Polyethylene
(d) Polycarbonates
2314: Other than India and China, which of the following groups of countries border Myanmar ?
(a) Bangladesh, Thailand and Vietnam
(b) Thailand, Laos and Bangladesh
(c) Cambodia, Laos and Malaysia
(d) Thailand, Vietnam and Malaysia
2315: The jet aircrafts fly very easily and smoothly in the lower stratosphere. What could be the appropriate explanation?
1. There are no clouds or water vapour in the lower stratosphere.
2. There are no vertical winds in the lower stratosphere.
which of the statements given above is/are correct in this context?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2