The human brain uses__________ percent of the total oxygen and blood in the body
(A) 20
(B) 12
(C) 35
(D) 48
A Little inhalation is done through________
(A) cigarettes
(B) pipes and cigars
(C) Both A and B offer little inhalation
(D) both offer extreme inhalation
The ozone layer is at height of________kilometers from the surface of the Earth
(A) 10 to 20
(B) 20 to 30
(C) 30 to 40
(D) 40 to 50
Short_sight defect could be corrected by a _____________ lens
(A) concave lens
(B) convex lens
(C) converging lens
(D) none of these
Reflex actions in head region are under the control of___________
(A) Brain
(B) Spinal cord
(C) both a & b
(D) non of the above
The repetition of property after a certain interval called ___________
(A) Electron efinity
(B) Atomic radius
(C) periodicity of property
(D) none of these
The distance of mercury from sun is__________
(A) 56 million km
(B) 57.9 million km
(C) 58.9 million km
(D) 59.1 million