816: Consider the following statements:
1. Indira Gandhi Centre for Atomic Research uses fast reactor technology.
2. Atomic Minerals Directorate for Research and Exploration is engaged in heavy water production.
3. Indian Rare Earths Limited is engaged in the manufacture of Zircon for India's Nuclear Programme beside other rare earth products.
Which of the statements given above are correct?
(a) 1, 2 and 3
(b) 1 and 2
(c) 1 and 3
(d) 2 and 3
817: The half-life of a radio active element is 5 years. The fraction of the radioactive substance that remains after 20 years is
(a) 1/2
(b) 1/4
(c) 1/8
(d) 1/16
818: Most of the explosions in mines occur due to the mixing of
(a) hydrogen with oxygen
(b) oxygen with acetylene
(c) methane with air
(d) carbon dioxide with ethane
819: Deficit financing means
(a) An excess of government's current expenditure over its current revenue
(b) An excess of government expenditures minus borrowings other than those from the RBI
(c) An excess of government's total expenditure over its total revenue
(d) An excess of government revenue over expenditure
820: If safe storage is to be ensured, the moisture content of food grains at the time of harvesting should not be higher than
(a) 14%
(b) 16%
(c) 18%
(d) 20%