281: Which one of the following subjects is under the Union List in the Seventh Schedule of the Constitution of Indian ?
(a) Regulation of labour and safety in mines and oilfields.
(b) Agriculture
(c) Fisheries
(d) Public health
282: Which of the following pairs is/are correctly matched ?
Inventor : Invention
1. Christopher : Hovercraft Cockerell
2. David Bushnell : Submarine
3. J.C. Perrier : Steamship
Select the correct answer using the code given below :
(a) 1 and 2, only
(b) 2 and 3, only
(c) 1 and 3, only
(d) 1, 2 and 3
283: Which one of the following is present in the largest amount in terms of per cent by mass in the earth's crust ?
(a) Silicon
(b) Oxygen
(c) Carbon
(d) Calcium
284: Where is the Central Water and Power Research Station located?
(a) Sileru
(b) Khadakwasia
(c) Srisailam
(d) Jamnagar
285: Indian cotton merchant, banker, Congressman and a close associate of Mahatma Gandhi'. This description fits
(a) G.D. Birla
(b) M.R. Jayakar
(c) Jamnalal Bajaj
(d) V.S. Srinivasa Sastri