Q. Which of the following colours has got the maximum refractive index for glass?
1) Blue
2) Green
3) Red
4) Indigo
Q. All the following are plant products except -
1) cork
2) hemp
3) silk
4) linen
Q. The most commonly used bleaching agent is -
1) alcohol
2) carbon dioxide
3) chlorine
4) sodium chloride
Q. An element found in all organic compounds -
1) oxygen
2) calcium
3) nitrogen
4) carbon
Q. Lime is sometimes applied to soil in order to -
1) increase the alkalinity of the soil
2) increase the acidity of the soil
3) restore nitrates to the soil
4) make the soil more porous
Q. Which one of the following elements is least likely to be found in commercial fertilizers?
1) Nitrogen
2) Phosphorus
3) Potassium
4) Silicon
Q. The moon has no atmosphere because -
1) on the atmosphere has ever formed there
2) the rock surface completely absorbed the gases
3) due to the low temperature, gases have condensed
4) its gravitational pull is not strong enough to hold an atmosphere
Q. Photophobia is -
1) a disease caused by too much sunlight
2) Abnormal intolerance of light
3) the adjustment of the eye for light
4) the ability to perceive light
Q. The brain of a normal human adult weighs about -
1) 1 lb
2) 2 lb
3) 3 lb
4) 4 lb
Q. The theory of inheritance of acquired characters was propounded by -
1) Charles Darwin
2) Gregor Mendel
3) J. B. Lamarck
4) Weismann
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