Page No-3
The size of the earth was first measured by
(A) Isaac Newton
(B) Galileo
(C) Eratosthenes
(D) Kepler
Days and nights are caused by:
(A) Rotation of the earth on its axis
(B) Revolution of the earth around the sun
(C) Inclination of the earth’s axis
(D) None of these
The crust forms what parentage of the volume of the earth:
(A) 0.5%
(B) 2.5%
(C) 3.0%
(D) 3.5%
At a latitude of 45°,the earth spins on its axis at the rate of:
(A)1120 km/h
(B)620 km/h
(C)510 km/h
(D)500 km/h
Green House Efreet means:
(A) Pollution in houses in tropical regions
(B) Cultivation in green houses so as the check pollution
(C) Trapping of solar energy due to atmospheric carbon dioxide
(D) None of these
The earth’s annual circuit round the sun covers a distance of:
(A) 1036 million km
(B) 966 million km
(C) 1096 million km
(D) None of these
Heart attacks are more common in
(A) fat persons
(B) thin persons
(C) lazy people
(D) sportsmen
Insolation heats up the land masses more quickly than the water bodies because:
(A) Rocks are bad conductor of heat
(B) Landmasses are solid
(C) Water needs more energy to warm
(D) None of these
The heavier silicates named Sima on Silica plus magnesium are most abundant in the:
(A) Crust
(B) Core
(C) Ocean floors
(D) Mantle
What is the approximate equatorial circumference of the earth?
(A) 30000 km
(B) 40000 km
(C) 50000 km
(D) 60000 km