2511: In a family, a couple has a son and a daughter. The age of the father is three times that of his daughter and the age of the son is half of his mother. The wife is nine years younger to her husband and the brother is seven years older than his sister. What is the age of the mother ?
(a) 40 years
(b) 45 years
(c) 50 years
(d) 60 years
2512: Estuaries possess distinct blooms of excessive growth of a pigmented dinoflagellates. These blooms are called
(a) red tides
(b) sea tides
(c) black tides
(d) sea flowers
2513: How many numbers from 0 to 999 are not divisible by either 5 or 7 ?
(A) 313
(B) 686
(C) 341
(D) 786
2514: Which one of the following soil types of India is rendered infertile by the presence of excess iron ?
(a) Desert sand
(b) Alluvial
(c) Podzolic
(d) Lateritic
2515: The words in the first column are written in a secret code in the second column. However, the secret writings in the second column are not in the same order. What is the code assigned for the letter D?
BRAIN 13529
DRAIN 35293
RIVER 13754
DRIVE 83754
(a) 3
(b) 5
(c) 1
(d) 9