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Illumination
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ Which of the following applications does not need ultraviolet lamps ? Car lighting [other wrong options] [Discuss in forum] Medical purposes Blue print machines Aircraft cockpit dashboard lighting |
Q22 ⇒ Which of the following is present inside the fluorescent tube ? Mercury vapour [other wrong options] [Discuss in forum] Argon and neon Argon and CO2 Helium and oxygen |
Q23 ⇒ In incandescent lamps, coiled coil filaments are used for gas filled lamps [other wrong options] [Discuss in forum] coloured lamps higher wattage lamps low wattage lamps '(e) none of the above |
Q24 ⇒ Illumination of one lumen per square metre is called lux [other wrong options] [Discuss in forum] lumen metre foot candle candela |
Q25 ⇒ In houses the illumination is in the range of 60-65 lumens/watt [other wrong options] [Discuss in forum] 2-5 lumens/watt 10-20 lumens/watt 35-45 lumens/watt |
Q26 ⇒ The cost of a fluorescent lamp is more than that of incandescent lamp because of which of the following factors ? All of the above factors [other wrong options] [Discuss in forum] More labour is required in its manuÂfacturing Number of components used is more Quantity of glass used is more |
Q27 ⇒ ____ cannot sustain much voltage flucÂtuations.  Incandescent lamp [other wrong options] [Discuss in forum] ÂSodium vapour lamp Mercury vapour lamp Fluorescent lamp |
Q28 ⇒ For normal reading the illumination level required is around 60-100 lumens/m2 [other wrong options] [Discuss in forum]  20-40 lumens/m2  200-300 lumens/m2 400-500 lumens/m2 |
Q29 ⇒ Which gas can be filled in GLS lamps ? Any inert gas [other wrong options] [Discuss in forum] Oxygen Carbon dioxide Xenon |
Q30 ⇒ When an electric bulb is broken it produces bang, this is due to vacuum inside the bulb [other wrong options] [Discuss in forum] pressure of air in the bulb pressure inside is equal to that outÂside none of the above |
Q31 ⇒ When a fluorescent lamp is to be operated on D.C. which of the following additional devices must be incorporated in the circuit ? Resistance [other wrong options] [Discuss in forum] Inductance Transformer Condenser |
Q32 ⇒ A solid angle is expressed in terms of _____ steradians [other wrong options] [Discuss in forum] radians/metre radians degrees |
Q33 ⇒ "The illumination is directly proporÂtional to the cosine of the angle made by the normal to the illuminated surface with the direction of the incident flux."
Above statement is associated with Lambert's cosine law [other wrong options] [Discuss in forum] Planck's law Bunsen's law of the illumination Macbeth's law of illumination |
Q34 ⇒ Filament lamp at starting will take current more than its full running current [other wrong options] [Discuss in forum] less than its full running current equal to its full running current |
Q35 ⇒ The function of capacitor across the supply to the fluorescent tube is primariÂly to Âimprove the supply power factor [other wrong options] [Discuss in forum] Âstabilize the arc reduce the starting current reduce the noise |
Q36 ⇒ In electric discharge lamps light is produced by ionisation in a gas or vapour [other wrong options] [Discuss in forum]  cathode ray emission  heating effect of current magnetic effect of current |
Q37 ⇒ The gas filled in vacuum filament lamps is none [other wrong options] [Discuss in forum] nitrogen argon air |
Q38 ⇒ Due to which of the following reasons the light of a tube appears cooler than that of a bulb ? Tungsten is not used in the tube [other wrong options] [Discuss in forum] Tube is painted with milky colour Tube consumer less power Surface area of the tube is more than that of bulb '(e)None of the above |
Q39 ⇒ The tungsten filament lamps when compared with fluorescent tubes have all the following advantages except longer life [other wrong options] [Discuss in forum] simple installation less costly more brightness |
Q40 ⇒ Which of the following statements is correct ? Light consists of electromagnetic waves [other wrong options] [Discuss in forum] Light is a form of heat energy Light is a form of electrical energy Light consists of shooting particles |
Or |