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When iron rusts, the weight
A. Increases
B. Decreases
C. Remains the same
D. First increases then decreases

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What is mainly obtained from bauxite ?

A. Copper
B. Aluminium
C. Iron
D. Gold

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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

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Which substance is commonly used in refrigerators ?
A. Freon
B. Oxygen
C. Ammonia
D. Sulphur dioxide

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Radar is used for
A. Detecting objects by using light waves
B. Reflecting sound waves to detect objects
C. Determining the presence and location of objects with radio waves
D. Tracking rain-bearing clouds

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Municipal water in India is generally treated with
A. Chlorine
B. Potassium permanganate
C. Sodium Chloride
D. Sodium Carbonate

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