1976: If a potato is placed on a pure paper plate which is white and unprinted and put in a microwave oven, the potato heats up but the paper plate does not. This is because:
(a) Potato contains water whereas paper does not contain water
(b) Potato transmits microwaves whereas paper reflects microwaves
(c) Potato is mainly made up of starch whereas paper is mainly made up of cellulose
(d) Potato is a fresh organic material whereas' paper is a dead organic material
1977: Which one of the following organisms is likely to show the highest- concentration of DDT once it has been introduced into the ecosystem ?
(a) Grasshopper
(b) Toad
(c) Snake
(d) Cattle
1978: Three Dice (each having six faces with each face having one number from 1 to 6) are rolled. What is the number of possible outcomes such that at least one dice shows the number 2 ?
(A) 36
(B) 81
(C) 91
(D) 116
1979: There are 6 person : A, B, C, D, E and F.
A has 3 items more than C
D has 4 items less than B
E has 6 items less than F
C has 2 items more than E
F has 3 items more than D
Which one of the following figures can not be equal to the total number of items possessed by all the 6 persons?
(a) 58
(b) 53
(c) 41
(d) 47
1980: The meeting of G-15 countries held in Malayasia in 1997 was attended by
(a) 14 member countries
(b) 15 member countries
(c) 16 member countries
(d) 17 member countries