100 Important Illumination MCQ Question and Answer | PDF Free Download
1.Sky appears blue because of
- ARefraction
- BReflection
- CRadiation
- DScattering of light over dust particles
2.A poor man for his kitchen will make use of
- AFluorescent tube
- BIncandescent lamp
- CSodium vapour lamp
- DHigh pressure mercury vapour lamp
3.Soft shadows are produced by
- AUsing surface source of light instead of point source of light
- BIncreasing the number of lamps
- CBoth (a) and (b)
- DNone of the above
4.Reflectors are provided with slits at the top to
- AIntroduce chimney effect for cleaning
- BReduce colour contrast
- CReduce heating effect
- DDo all of the above functions
5.In sodium vapour lamp neon gas
- AActs as a shield around the filament
- BAssists in developing enough heat to vaporise the sodium
- CChange the colour og light
- DPrevents the vaporization of filament
6.In fluorescent tubes ballast resistance is connected in series with the choke
- ATo reduce stroboscopic effects
- BWhen tube operates on DC supply
- CWhen supply frequency is low
- DTo reduce radio interference
7.In incandescent lamps, coiled coil filaments are used for
- AColoured lamps
- BHigher wattage lamps
- CGas filled lamps
- DLow wattage lamps
8.When a fluorescent lamp is to be operated on DC which of the following additional devices must be incorporated in the circuit?
- AInductance
- BTransformer
- CResistance
- DCondenser
9.The tungsten filament lamps when compared with fluorescent tubes have all the following advantages except
- ASimple installation
- BLonger life
- CLess costly
- DMore brightness
10.The level of illumination on a surface least depends on
- AAmbient temperature
- BCandle power of the source
- CDistance of the source
- DType of reflector used