1356: A man takes 6 km distance to go round a rectangular area. If the area of the rectangle is 2 km, find the difference between length and breadth
(a) 1 km
(b) 0.5 km
(c) 2 km
(d) 0.75 km
1357: What happens when the temperature of water falls from 30°C and 0°C?
(a) The volume of ice formed will be less than volume of water
(b) The volume of ice formed will be more than the volume of water
(c) Water will not freeze at 0°C
(d) None of the above
1358: Consider the following pictures of a dice :
What is the number opposite of 3 ?
(a) 1
(b) 4
(c) 5
(d) Data insufficient
1359: Within biological communities, some species are important in determining the ability of a large number of other species to persist in the community. Such species are called
(a) Keystone species
(b) Allopatric species
(c) Sympatric species
(d) Threatened species
1360: 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