Important Gk Practice Set

GK‬ (1-20)
1. Parsec is a measure of - Astronomical distance
2. The blue colour of the water in the sea is due to – Scattering of blue light by water molecules
3. Galvanized iron is coated with a thin coating of - Zinc
4. In the visible spectrum the colour having the shortest wavelength is – Violet
5. The unit of power is - Joule per second and watt both
6. The heater element in an electric iron is made of – Nichrome
7. If woolen cloth of red colour is seen in the light of a mercury vapour lamp, then the cloth will appear – Black
8. At sun rise or at sun set, the sun appears to be reddish while at midday it looks white. This is because of – Scattering due to dust particles an air molecules causes this phenomenon
9. The radiant energy of the sun results from – Nuclear fusion
10. A microscope, in which maximum magnification is achieved, but the object cannot be seen by eye, is called
– Electron microscope
11. The image formed on the retina of the eye is – real and inverted
12. The transverse nature of light is shown by – Polarization of light
13. The surface of water in a lake is just going to freeze. What is the temperature of water at the bottom - 40 C
14. Out of water, glycerin, alcohol, air and coal tar - which one is the most viscous medium – coal tar
15. A double convex air bubble in water would behave as a - Divergent lens
16. Railway tracks are banked on curves so that - Necessary centripetal force may be obtained from the horizontal component of the weight of the train
17. The density of water is maximum at - 4 Digree C
18. Oil rises up the wick in a lamp because - Of the surface tension phenomenon
19. An ice cube contains an iron ball in it and floats in water contained in a vessel. What will happen if the ice melts away - The water level will go down
20. Which of the following utilizes Newton’s third law of motion? - Space –rocket