251: Besides proteins and carbohydrates, other elements of nutritional value found in milk include
(a) calcium, potassium and iron
(b) calcium and potassium
(c) potassium and iron
(d) calcium and iron
252: Fertility of soil can be improved by:
(a) Removing dead earthworms
(b) Adding dead earthworms
(c) Adding living earthworms
(d) Removing living earthworms and adding dead earthworms
253: Total internal reflection can take place when light travels from
(a) diamond to glass
(b) water to glass
(c) air to water
(d) air to glass
Explanation:
Total Internal Reflection takes place when light travels from a denser medium (diamond) to the rarer medium (glass) and also the angle of incidence must be greater than critical angle (diamond).
254: In which type of rocks are metals like gold and copper mostly found?
(a) Old igneous
(b) Old metamorphic
(c) Old sedimentary
(d) New metamorphic
255: Which one of the following is secreted by Pancreas and regulates the amount of sugar in the body:
(a) Renin
(b) Creatin
(c) Vitamin
(d) Insulin