Hailey’s comet becomes visible after every_________?
A. 86 years
B. 76 years
C. 1000 years
D. 365 years
_________ 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
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