Second layer of the Earth’s atmosphere is__________?

A. Stratosphere

B. Mesosphere

C. Troposphere

D. Thermosphere

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Intrinsic Semi-conductor is also called as__________?

A. Impure-Conductor

B. Pure-Conductor

C. Simple Conductor

D. None of these

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The vitamin which is generally excreted by humans in urine is__________?

A. Vitamin A

B. Vitamin B

C. Vitamin B12

D. Vitamin C

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