66: Different seasons are formed because:
(a) Sun is moving around the earth
(b) Of revolution of the earth around the sun on its orbit
(c) Of rotation of the earth around its axis
(d) All of the above
67: Assertion (A) :
The surface winds spiral inwards upon the centre of the cyclone.
Reason (R) :
Air descends in the centre of the cyclone.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Explanation:
'A' is correct but 'R' is wrong. The surface winds spiral inwards upon the centre of the cyclone, in the eye of the cyclone air ascends. However, the central portion of the eye has a small counter current where air descends.
68: Eskers and Drumlins are features, formed by
(a) Running water
(b) Underground water
(c) The action of wind
(d) Glacial action
69: Physiological population density is the ratio of:
(a) Total population to total area
(b) Total population to total irrigated land area
(c) Total population to urban land area
(d) Total population to rural land area
70: There are two places P and Q. The longitudes of P and Q are 45° E and 60°W respectively. What will be the difference in their local times:
(a) 7 hours
(b) 6 hours
(c) 3.5 hours
(d) Both places will have the same local time