Physics-Objective Related Question Answers
176. Colour television uses?
Additive colour mixing
177. By mixing suitable mixture of primary colours gives?
Secondary colours
178. The branch of physics which deals with the measurement of light. emitted by objects is called?
Photometry
179. Tertiary colours are obtained by?
Mixing up of two secondary colours
180. The substances used in colour paints, filters, plastics and other materials?
Pigments
181. Subtractive colour mixing is used in?
Pigments
182. For printing, colour pigments used are?
Yellow; Magenta; Cyan
183. The light rays consist of small energy packets called?
Quantum
184. Quantum of light is known as?
Photon
185. Quantum Theory was put forward by?
Max Planck
186. Absorption of light of one wave length by a substance and the re-emission of light of greater wavelength is called?
Fluorescence
187. Emission of light in the visible region after absorbing certain electromagnetic radiations is called?
Photoluminescence
188. Photoelectric Effect was proposed by?
Heinrich Hertz
189. Photoelectric Effect was explained by?
Albert Einstein
190. For his explanation of Photoelectric Effect, he got Nobel prize for Physics in?
1921
191. The Law of Photoelectric Effect was formulated by?
Albert Einstein
192. The working principle of solar cells?
Photoelectric Effect
193. When a ray of light falls on a smooth surface and returns to the same medium, it is called?
Reflection of light
194. An object which reflects all colours appears as?
White
195. An object which absorbs all colours appears as?
Black
196. The bending of light when a ray of light travels from one medium to another is called.?
Refraction
197. Snell's law is related with?
Refraction
198. Twinkling of stars is due to?
Refraction of light
199. A pond looks shallow is due to?
Refraction of light
200. Stick appears to be bended, when immersed in water is due to?
Refraction of light
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