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126. Which of the following statements regarding the use of diamond are correct ? 1. Diamond being teh hardest substance, is used in glass cutters and rock drilling equipment. 2. Because of its extraordinary sensitivity to heat rays, diamond is use for making high precision thermometers. 3. Sharp - edged diamonds are used by eye - surgeons as a tool to remove catarct from eyes. 4. Because of its ability to keep out the harmful radiations, diamond is used for making protective windows for space satellites.
A. 1, 2, and 3
B. 2, 3 and 4
C. 1, 2 and 4
D. 1, 2, 3 and 4
Explanation:
127. A glass tumbler cracks when very hot water is poured into it because
A. it is not a strong material.
B. it expands equally from inside and outside.
C. glass is a bad conductor of heat.
D. it does not expand much on heating.
Explanation:
128. The blue colour of the water in the sea is due to
A. absorption of other colours by water molecules
B. reflection of the blue light by the impurities in sea water
C. reflection of blue sky by sea water and scattering of blue light by water molecules
D. None of these
Explanation:
129. Pouring of kerosene oil on stagnant water reduces mosquito problem because :
A. it is highly toxic to the mosquitoes.
B. it interrupts the mating of adults.
C. it repels the mosquitoes.
D. it interrupts the breathing of larvae
Explanation:
130. The credit of improving the properties of rubber by the process of vulcanization goes to
A. Thomas Hamcock
B. Dunlop
C. Charles Goodyear
D. Lacondamine
Explanation:
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