Basic Physics
| 1 | Ozone layer in the upper atmosphere is due to the reactions of | |
| carbon dioxide and oxygen | ||
| oxygen and ultraviolet rays | ||
| infra-red rays and ultraviolet rays | ||
| carbon dioxide and layers of atmosphere | ||
| 3 | The working principle of a washing machine is | |
| reverse osmosis | ||
| diffusion | ||
| centrifugation | ||
| dialysis | ||
| 4 | Ball bearings are used in cycles, scooters etc to | |
| Increase the friction between the wheel and the axle | ||
| Reduce the friction between the wheel and the axle | ||
| Reduce the friction between ground and the wheel | ||
| None of the above | ||
| 5 | The splitting of different colours of light in a prism is | |
| Refraction of light | ||
| Diffraction of light | ||
| Dispersion of light | ||
| Reflection of light | ||
Correct answer is : C
| 6 | Optical fiber works on the principle of | |
| scattering | ||
| interference | ||
| total internal reflection | ||
| refraction | ||
| 7 | Cryogenic engines find application in | |
| frost - free refrigerators | ||
| sub-marine propulsion | ||
| rocket technology | ||
| researches in superconductivity | ||
| 8 | Basically domestic electric wiring is a | |
| parallel connection | ||
| series connection | ||
| combination of series and parallel connections | ||
| none | ||
| 9 | Total internal reflection can take place when light travels from | |
| Air to glass | ||
| Air to water | ||
| Water to glass | ||
| Diamond to glass | ||
10 What is the increasing order of the wavelengths of the following colors?
|
||
| 1,2,3,4 | ||
| 1,3,2,4 | ||
| 3,1,4,2 | ||
| 4,2,3,1 | ||
Correct answer is : D
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