Each day human body breathe in ___ litres 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
Deficiency of Vitamin-D results in:
A. night blindness
B. rickets
C. scurvy
D. hair fall
A device which converts chemical energy into electrical energy is called:
A. motor
B. generator
C. moving-coil meter
D. Battery
A Longsightedness can be corrected by using the _____ lens.
A. Concave
B. Convex
C. Diverging
D. None of these
Which is the outermost planet in the solar system?
A. Mercury
B. Pluto
C. Neptune
D. Uranus