442. What are the primary colours ?
(a) Red, blue, green
(b) Blue, green, yellow
(c) Yellow, red, blue
(d) Green, white, black
443. If water contracts on freezing which of the following would happen ?
(a) Icebergs will completely float on the surface of water
(b) Lakes would freeze from top to bottom
(c) Ice would become more dense
(d) Rocks will crack due to freezing of internal water
444.Conception generally takes place
(a) At the time of menses
(b) Before menses
(c) Two weeks after menses
(d) Immediately after menses
445. Why do mothers feed the child with Vitamin A ?
(a) To prevent night blindness
(b) To prevent rickets
(c) To prevent beri-beri
(d) To prevent polio
446. Growing children require comparatively more
(a) Carbohydrates
(b) Vitamins
(c) Proteins
(d) All of these
447.Heart patients should avoid taking excess of
(a) Carbohydrates
(b) Proteins
(c) Vitamins
(d) Fats
448.Which of the following is commonly present in acids ?
(a) Hydrogen
(b) Oxygen
(c) Sulphur
(d) Nitrogen
449.Dysentery and influenza are caused by
(a) Bacteria
(b) Bacteria and viruses respectively
(c) Viruses
(d) Viruses and bacteria respectively
450.What is done to raise the dough making bread ?
(a) Yeast is added
(b) Alcohol is added
(c) Carbon dioxide is passed
(d) Air is passed
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