Deficiency of Vitamin-D results in ______.
A. night blindness
B. rickets
C. scurvy
D. hair fall
Each day human body breathe in ______ liters of air.
A. 5,000 to 10,000
B. 10,000 to 15,000
C. 15,000 to 20,000
D. 20,000 to 25,000
The most abundant element in the Earth’s crust is ______.
A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. Silicon
The most abundant element in the universe is ______.
A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. Silicon
A device which converts chemical energy into electrical energy is called _____. A. motor B. generator C. moving-coil meter D. battery <!--more-->
Radioactivity was discovered by _____. A. Kelvin B. Thomson C. Rutherford D. Bacquerel <!--more-->
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