Q. The volume of which of the following materials decreases when it is heated from 0° C to 5° C?
1) Air
2) Copper
3) Water
4) Mercury
Q. Vitamin B12 is most useful for combating -
1) anaemia
2) goitre
3) night blindness
4) rickets
Q. Which of the following vitamins is helpful for the coagulation of blood?
1) C
2) D
3) E
4) K
Q. A triode differs from a diode in the way that -
1) it can amplify a signal
2) it has a vacuum inside
3) it has a heated cathode
4) the photoelectric effect causes it's current
Q. Small amounts of iodine are necessary in our diet to -
1) Prevent pellagra
2) Compensate for under activity of the thyroid gland
3) stimulate clotting of blood
4) stimulate pituitary gland
Q. Exposure to sunlight helps a person improve his health because -
1) The infra-red light kills bacteria in the body
2) Resistance power increases
3) The pigment cells in the skin get stimulated and produce a healthy tan
4) The ultraviolet rays convert skin oil into Vitamin D
Q. The most abundant element in the earth's atmosphere is -
1) Carbon dioxide
2) Hydrogen
3) Oxygen
4) Nitrogen
Q. The red blood cells are formed in the -
1) Heart
2) Liver
3) Lymph nodes
4) Bone marrow
Q. Of the following foods, which one is the best source of protein?
1) Butter
2) Fish
3) Lettuce
4) Milk
Q. The element of an electric stove is made of -
1) copper
2) aluminium
3) magnalium
4) nicrome
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