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686. Water is a compound because
A. it exists as a solid, a liquid or a gas.
B. it contains hydrogen and oxygen.
C. it contains two different elements joined by chemical bonds.
D. it cannot be split up into simpler substances by chemical means.
Explanation:
687. Which of the following contains a good percentage of carbohydrates, fats and proteins ?
A. Green vegetables
B. Milk
C. Groundnut
D. Cereals
Explanation:
688. The term Black Box is more commonly used in relation to which of the following ?
A. It ia a box in which high grade uranium is kept to prevent radiation.
B. It is a time capsule in which records of important events are kept to be opened at a later date.
C. It is a flight recorder in an aeroplane.
D. None of these.
Explanation:
689. Which of the following is not a chemical reaction ?
A. Burning of paper
B. Digestion of food
C. Conversion of water into steam
D. Burning of coal
Explanation:
690. Which of the following are correctly matched ? 1. Tse tse fly - Sleeping sickness 2. Female anopheles mosquito - Malaria 3. Sand fly - Kala Azar
A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
Explanation:
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