_________ planets orbits around the sun in a clockwise direction?
A. Earth
B. Mercury
C. Jupiter
D. Venus
Second layer of the Earth’s atmosphere is__________?
A. Stratosphere
B. Mesosphere
C. Troposphere
D. Thermosphere
Intrinsic Semi-conductor is also called as__________?
A. Impure-Conductor
B. Pure-Conductor
C. Simple Conductor
D. None of these
Phosphorous contains which of the following?
A. Organisms
B. Soil and water
C. Air
D. All of above
Where ozone layer lies from the earth surface?
A. 10 to 20 km
B. 20 to 30 km
C. 30 to 40 km
D. 40 to 50 km