81: Who among the following served as the Chief Economist of the International Monetary Fund ?
(a) Saumitra Chaudhuri
(b) Ashok Lahiri
(c) Raghuram Rajan
(d) Sumantra Ghoshal
82: Optical fibre works on the principle of
(a) total internal reflection
(b) refraction
(c) scattering
(d) interference
83: Which one of the following genetic diseases is sex-linked ?
(a) Royal haemophilia
(b) Tay-Sachs disease
(c) Cystic fibrosis
(d) Hypertension
84: Consider the following countries:
1. Albaina
2. Bosnia Herzegovina
3. Croatia
4. Macedonia
Which of these countries has/have Adriatic Sea as a boundary?
(a) 1 and 2
(b) 1, 2 and 3
(c) 4 only
(d) 3 and 4
85: Graphene is frequently in news recently. What is its importance?
1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs.
Which of the statements given above are correct?
(a) 1 and 2 only
(b) 3 and 4 only
(c) 1, 2 and 4 only
(d) 1, 2, 3 and 4