50 Important General Science Question and Answers 06 | santhoshnair.net

50 Important General Science Question and Answers 06

50 Important General Science Question and Answers 06

01. The escape velocity of the planets increases with its? - Mass
02. The scientific study of light? - Optics
03. Light is an? - Electromagnetic Wave &. Transverse wave
04. Light travels through air or vacuum at a speed of 3? - x 108m/s
05. Order of speed of light? - water < glass.< air < vacuum
06. The velocity of light is greater than the? - Sound
07. Light reaches earth from the sun in? - 8 minutes 20semnds (500 seconds)
08. Substances which do not pass light through them are called? - Opaque substances eg: paper, store
09. Substances which allow light to pass through them are called? - Transparent substances eg: glass
10. Wave theory of light was proposed by? - Christian Huygens
11. Electromagnetic theory of light was proposed by? - James Clark Maxwell
12. ‘The Corpuscular theory' related to light was proposed by? - Isaac Newton in 1675
13. The shadow obtained from a point source is a region of darkness which is called? - Umbra
14. The band of seven colours obtained due to the dispersion of white light is called? - Visible Spectrum
15. When frequency increases wavelength? - Decreases
16. Colour with maximum frequency is? - Violet
17. Colour with minimum frequency is? - Red
18. Colour with maximum wavelength is? - Red
19. Colour with minimum wavelength is? - Violet
20. The colour that deviates maximum through glass prism is? - red
21. The colour that deviates minimum through glass prism is? - Violet
22. Colour used in the laboratory for indicating danger? - Yellow
23. Colour sensitive to the human eye? - Yellow
24. Colour used as danger signal? Red
25. The corpuscular theory was propounded by? - Isaac Newton
26. Wave theory was propounded by? - Christiaan Huygens
27. Quantum Theory was propounded by? - Max Planck
28. The electromagnetic theory was propounded by? - James Clark Maxwell
29. The photoelectric effect was propounded by? - Heinrich Hertz
30. Which surface reflects all form's of light and heat? - white surface
31. Which surface absorbs all forms of light and heat? - black surface
32. Red light passing through a green object, appears? - Black
33. Why the Sky appears blue? - Due to the shorter wavelength of blue colour, it is scattered more than the red colour of longer wavelength
34. Primary colours are? - Red, Green, Blue
35. Primary colours used in colour television are? - Red, Green, Blue
36. Colour television uses? - Additive colour mixing
37. By mixing suitable mixture of primary colours gives? - Secondary colours
38. The branch of physics which deals with the measurement of light. emitted by objects is called? - Photometry
39. Tertiary colours are obtained by? - Mixing up of two secondary colours
40. The substances used in colour paints, filters, plastics and other materials? - Pigments
41. Subtractive colour mixing is used in? - Pigments
42. For printing, colour pigments used are? - Yellow, Magenta, Cyan
43. The light rays consist of small energy packets called? - Quantum
44. Quantum of light is known as? - Photon
45. Quantum Theory was put forward by? - Max Planck
46. Absorption of light of one wavelength by a substance and the re-emission of light of greater wavelength is called? - Fluorescence
47. Emission of light in the visible region after absorbing certain electromagnetic radiations is called? - Photoluminescence
48. Photoelectric Effect was proposed by? - Heinrich Hertz
49. Photoelectric Effect was explained by? - Albert Einstein
50. For his explanation of Photoelectric Effect, he got Nobel prize for Physics in? - 1921


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