4581: India's contribution to Mathematics includes:
1. Number system
2. Decimal system
3. Concept of zero
(a) 1, 2 & 3
(b) 1 & 2
(c) 2 & 3
(d) 1 & 3
4582: Himalayan rivers are perennial because:
(a) They flow from inexhaustible springs in the Himalayas
(b) They are fed in summer by melting snow of Himalayas
(c) There is continuous rain throughout the year in the catchment areas
(d) None of the above
4583: A weightless rubber balloon is filled with 200 cc of water. Its weight in water is equal to:
(a) (9.8/5) N
(b) (9.8/10) N
(c) (9.8/2) N
(d) zero
4584: India is a member of which of the following?
1. Asian Development Bank
2. Asia-Pacific Economic Cooperation
3. Colombo Plan
4. Organization for Economic Cooperation and Development (OECD)
Select the correct answer using the code given below:
(a) 1 and 3 only
(b) 1, 2 and 3 only
(c) 2 and 4 only
(d) 1, 2, 3 and 4
4585: If all the numbers from 501 to 700 are written, what is the total number of times does the digit 6 appear ?
(A) 141
(B) 138
(C) 140
(D) 139