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1421. The following are some great discoveries in Physics : 1. X-rays2. Theory of relativity3. Super conductivity4. Raman effect The chronological order in which they were discovered is :
A. 1, 2, 3, 4
B. 1, 2, 4, 3
C. 1, 3, 2, 4
D. 4, 1, 2, 3
Explanation:
1422. Soap is used in washing because :
A. it lowers the surface tension of water
B. it increases the surface tension of water
C. increasesthe viscosity of water
D. decreases the viscosity of water
Explanation:
1423. Which of the following statements regarding the uses of diamond are correct ? 1. Dimond being the hardest substance, is used in glass cutters and rock drilling equipment. 2. Because of its extraordinary sensitivity to heat rays, diamond is used for making high precision thermometers.3. Sharp-edged diamonds are used by eye-surgeons as a tool to remove catarct from eyer.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:
1424. A thermostat is
A. a device which varies the temperature of a bath
B. an instrument by which the accuracy of thermometers are determined
C. a device used to maintain a constant temperature of a water bath or an overn
D. a modern type of thermoflask which works on the principle of equipartition of heat energy
Explanation:
1425. Speed of sound is greater in solids than in liquids because :
A. the atoms in solids are regularly arranged
B. the atoms in liquids are loosely packed
C. the solids have high elasticity
D. none of these
Explanation:
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