41.Life Span of Red blood cells in Human body is ?
b)115- 130 days
42.Blood cells are stored in _____ ?
It is responsible for purifying the blood
43.Nitrogen Percentage in Air ?
44.Which gas is used in Refrigerator ?
45.The pH value of substances ranges from _____ to ______ ?
a)1 to 5
b)0 to 4
pH of 7 is neutral.if the pH of substace is less than 7 it is called as acidic and if the pH is greater than 7 is called basic.
46.______ gas is used for artificial fruit ripening ?
47.Nitrous Oxide is Commonly known as ?
48._____ is unit for Electrical resistance ?
this is named after German Physicist Georg Ohm
Formula for Electric Resistance is R=V/L where V =Voltage