Mul t i pl e Choi ce Quest i ons of El ect r i c I l l umi nat i on ( 115) :
1. Rad i an t effi ci en cy f ot hel um i no ussou r cede pe nd s ( A) sh ape of t he so ur ce ( B) t emper at ur e of t he so ur ce ( C) wave l engt h of l i ght r ays ( D) al l of t he above .
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2.Light waves
r t ave l wi t h a ve l oci t y o f
( A) 3 x10cm 1 0/ s ( B) 3 x12cm 1 0/ s ( C) 3 x15 10 cm / s ( D) 3 x18 10 cm / s.
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Car bo n 3.
ar c am l ps e arcom mon l y used n i
( A) domest i c i g l ht i ng ( B) st r eet l i ght i ng ( C) ci nema pr oj ect or s ( D) phot ogr aphy.
o n
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The uni t of so l i d angl e i s 4. ( A) so l i d angl e ( B) a r di an ( C) st er adi an ( D) can del a.
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Candel ai s h t e uni t of 5. ( A) Lum i no us flux ( B) Lumi nous n i t ensi t y ( C) Wavel en gt h ( D) Non e o ft heab ove.
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6. The uni t of l umi nous ( A) st er adi an ( B) ca ndel a ( C) l um en ( D) l ux.
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flu x s i
7. The i l l umi nat i on i s
d i r ect l y p r opor t i onal t ot he co sn i e of t he angl e made by h t e nor mal t o
t he i l l umi nat ed su r f acewi t h t he di r ect i on of t he i nci dent flu x.Abovest at ement i s ass oci at ed wi t h ( A) Pl anck ' sl aw ( B) Macb et h' s a l w of i l l umi nat i on ( C) Bunse n' s a l w of i l l umi nat i on ( D) Lamber t ' s co si ne l aw .
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8. Whi chcu r ver epr ese nt s i f l e of t he l amp ?
( A) cu r veA ( B) cu r veB ( C) cu r veC ( D) cur ve . D
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9. I l l umi nat i on l eve lr equi r ed f or pr eci si on wor k s i a r ound 2 ( A) 50 l m/ m
2 ( B) 10 0l m/ m
( C) 200 m/ l2m 2
( D) 500 m/ lm . Get Answer
Whi chof t he f ol l owi ng wi l l need t he hi ghestl eve l of i l l umi nat i on ? 10. ( A) Pr oof r eadi ng ( B) Bed oom r s ( C) Hosp i t al war ds ( D) Rai l waypl at f or ms. Get Answer
Whi chof t he f ol l owi ng wi l l need l owestl eve l of i l l umi nat i on ? 11. ( A) Di sp l ays ( B) Fi ne engr av i ng ( C) Rai l way pl at f or m ( D) Audi t or i ums. Get Answer
12. Whi chof t he f ol l owi ng l amp gi ve s
n ear l y m onoch r omat i c i g l ht ?
( A) Sod i um vapo rl am p ( B) GLSl am p ( C) Tu be l i ght ( D) Mer cur y vapo rl am p.
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13. The i l l umi nat i on l eve li n house s s in it he r ange 2 ( A) 10 20l um en / m
2 ( B) 30- 50l um en / m
2 ( C) 40 75 um l en / m
2 ( D) 10 014 0l um en / m .
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Lu mi no us 14.
effi ci en cy f oa flu or es cen tt ub e s i
( A) 5-10l um en s/ wat t ( B) 15 20l um en sw / at t ( C) 30- 40l um ens/ wat t ( D) 60 -65 u l mens/ wat t .
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15. Onel um enpe r squa r e m et eri s he t sam e ( A) Onel ux ( B) Onecand el a
as
( C) One o f otca ndl e ( D) Onel um enmet er .
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1. B - . 2 A - 3. C - . 4 C - . 5 B - 6. C - . 7 D - . 8 B 9. D 10. A 11. C - 2 1 . A 13. D 14. D - 5 1 . A
St andar d wat t age of 3 f t . flu or esce nt t ube i s 16. ( A) 10W ( B) 40W ( C) 65W ( D) 100 . W
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Fo rt hesam e 17.
w ast ag e whi ch am lp s i chea pe st?
( A) Sod i um vapo rl am p ( B) Mer cur y vap orl am p ( C) Fl uor esce nt t ube ( D) GLSl am ps.
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18. Opt i ca li ns t r ument s ar c n kow n as
u se df or t he co mpar i so n of ca ndl e pow er s o f di ffe r ent so ur ce s
( A) Can de l met er s ( B) Rad i o m et er s ( C) Bunsen et er m ( D) Pho t o m et er .
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19. Whi chphot omet er i s
u se df or co mpar i ng t he l i ght s o f di ffe r ent co l or s ?
( A) Bun sonhot p om et er ( B) Gr ea se sp otph ot om et er ( C) Lum merBr odhum phot om et er ( D) Gui l ds Fl i cke r Phot omet er .
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Whi chphot omet er depends o f ri t s 20.
o per at i onon L amber t ' s co si ne aw l ?
( A) Macb eh tl l umi no m et er ( B) Trot t er I l l umi nat i on Phot omet er ( C) Lum merBr odhum Phot om et er ( C) Gui l d' s F l i cke r Phot omet er .
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21. Whi ch ho pt om et erde pe nd s or f i t s ( A) Gui l ds F l i cke r Phot omet er ( B) Lum merBr odhum Phot om et er
op er at i ononI nve r se qu Sar e L aw ?
( C) Macb et hl l l um i no met er ( D) Tr ot t er I l l umi nat i on Phot omet er .
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The co l or t emper at ur e of dayl i ght i s 22.
a r ound
( A) 50K ( B) 16 0 K ( C) 60 0 K ( D) 600 0 K .
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Li ght i s 23.
p r oduce di n el ect r i c d i sc har ge l amps b y
( A) heat i ng effectof cu r r ent ( B) magnet i c e ffe ctof cu r r ent ( C) i oni za t i on i n a gas o r va por ( D) ca r bon e l ect r odes.
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Lumen/ wat ti s h t e uni t of 24. ( A) Li ght flu x ( B) Lumi nous n i t ensi t y ( C) Br i ght ness ( D) Lu mi no us ffi e ci ency.
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Candel ai st he uni tf or 25. ( A) Li ght flu x ( B) Lumi nous n i t ensi t y ( C) Br i ght ness ( D) Lu mi no us ffi e ci ency.
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26. Whi ch as g si som et i mes sed u i n
fil am en tl am ps ?
( A) Ar go n ( B) Kr yp t on ( C) Ni t r ogen ( D) Car bon d i oxi de.
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Whi ch ul b b o pe r at es n o ow l est po wer? 27. ( A) Ni ght bul b ( B) Neo n bu l b ( C) GLSbul b ( D) To r chbul b.
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28. Theou t pu t ofa
un tgst enfil am en tl am p d ep en ds n o
( A) si zeof l amp ( B) si zeof sh el l ( C) t em pe r at ur e offil am en t ( D) al l of t he above .
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A zer o w at tl am p 29.
consum es
( A) no pow er ( B) abou t5 o t 7 Wpow er ( C) about 15 ot W pow er ( D) abo ut25 ot 3 0 W pow er .
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30. Mel t i ng t emper at ur e of t ungst en i s ( A) 20 00 ° K ( B) 25 00 ° K ( C) 26 55 ° K ( D) 36 55 ° K.
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16. B 17. D - 18. D - 19. D - 20. B - 21. C - 22. D - 23. C 24. D 25. B 26. A - 27. D 28. C 29. B - 30. D
31. The l i f e of i nca ndesce nt l amp i s
e xp ect ed t o be
( A) 10 0 h ou r s ( B) 20 0 h ou r s ( C) 10 00ho ur s ( D) 10 00 0 ho ur s.
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The so ur ceof i l l umi nat i on f or a ci nema pr oj ect or i s 32. ( A) I nca nde sce nt l am p ( B) Mer cur y vap orl am p ( C) Sodi um l am p ( D) Car bo n a r c am l p.
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33. Sodi um
va po rl amps n eed i oni za t i on pot ent i alof abou t
( A) 5 vo l t s ( B) 50 vo l t s ( C) 100 vo l t s ( D) 112 vo l t s.
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34. When a so di um
va por l amp i s sw i t ch ed on, i ni t i al l y h t e co l or i s
( A) Pi nk ( B) e Y l l ow ( C) Gr ee n ( D) Bl ue. Get Answer
I n a so di um 35.
va por l amp t he di sch ar ge i s fi r stst ar t ed i nt he
( A) neo n g as ( B) ni t r ogen gas ( ' C) ar gon gas ( D) kr yp t on ga s. Get Answer
A au t o 36.
r t an sf or meruse d w i t h so di um vap orl amp sh ou l d h ave
( A) hi gh e ffici ency ( B) hi gh st epup r at i o ( C) hi gh st epdown r at i o ( D) hi gh e l ak age r eact ance . Get Answer
37. The ca paci t or use di n aut ot r ansf or mer ci r cu i tf or so di um
va por l amps,i s o f r
( A) pr ot ect i on agai nstacc i dent al power f ai l ur e ( B) c ont r ol l i ng i l l umi nat i on l eve l of t he l amp ( C) f or r egul at i ng di sc har ge vo l t age ( D) f or i mpr ovi ng t he power f act or of t he ci r cu i t .
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38. A mer cur y vapo rl am p
g i ves
( A) pi nk i g l ht ( B) ye l l ow l i ght ( C) gr eeni shbl ue l i ght ( D) whi t e l i ght .
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Und erhe ti nflu en ceof fluo r esce ntl am pssom et i mes he t whe el s o fr ot at i ng 39. mach i ner y a ppear t o be st at i onar y.Thi s s i d ue t ot he ( A) flu cu t at i ons ( B) l um i ne scen ceeff ect ( C) st r obosco pi c e ffe ct ( D) l ow power f act or .
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40. Power f act or i s ( A) Mer cu r y ar c am lp
h i ghesti n ca seof
( B) Sod i um vapo rl am ps ( C) Tube l i ght s ( D) GLSl am ps.
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41. Whi chof t he f ol l owi ng el ect r i c
d i sch ar ge l amp gi ve s h i ghestl umens/ wat t
( A) Sod i um vapo rl am p ( B) Neonam l p ( C) Mer cu r y am l p atl ow pr ess ur e ( D) Mer cu r y va po r at hi gh p r essu r e.
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The so l i d angl e su bt ended att he ce nt er of a hemi sp her e of di amet er D wi l l be 42. ( A) 4π D ( B) 2π D ( C) 2π ( D) 4π .
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Whi chone of t he f ol l ow i ng i s 43. ( A) Sodi um l am p ( B) Neonam l p ( C) GSL am lp
aco l d ca t hode l amp ?
( D) Tube l i ght .
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I n a mer cu r y 44.
va por l amp l i ght r ed obj ect s a ppear bl ackdue t o
( A) hi gh wave l engt h of r ed obj ect s ( B) co l or mi xi ng ( C) abse nceof r ed l i ght f r om l amp r adi at i on ( D) abso r pt i on of r ed l i ght by h t e l amp r adi at i on.
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45. Thefli cker eff ec t offluo r escen tl am p s i m or e
p r on ou nce d a t
( A) l ower vo l t ages ( B) hi gher vo l t ages ( C) l ower f r equenci es ( D) hi gher f r equenci es.
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31. C - 2 3 . D - 3. A - 4 3 . A - 5 3 . A - 6 3 . D - 7 3 . D - 8 3 . C 39. C 40. D 41. A - 42. C 43. B 44. C - 45. C
46. The f r equency f ofli cke r s n i a flu or esce nt l amp at 220 V, 50Hz ( A) 25pe r seco nd ( B) 50pe r seco nd
su ppl y w i l l be
( C) 10 0 p erseco nd ( D) 22 0 pe r secon d.
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Wav el engt h of gr een co l or i s 47.
n ear l y
( A) 40 00A ( B) 45 00A ( C) 50 00A ( D) 5500 A.
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One ngst A r om i s 48. 6 ( A) 10 met er
( B) 10-8 met er 8 ( C) 10 c m
8 ( D) 10 mm.
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Whi chof t he f ol l ow i ng co l or has 49. ( A) e Y l l ow ( B) Bl ue ( C) Vi ol et ( D) None.
w ave l engt h bet ween gr een an d co l or ?
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The pur poseof pr ov i di ng a ch okei nat ube l i ght i s 50. ( A) t o el i mi nat e co r ona effect s ( B) t o avo i d r adi o i nt er f er enc e ( C) t oi mpr ove pow er f act or ( D) t o l i mi tc ur r ent t o appr opr i at e va l ue.
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51. A 60W
l am p g i ven a um li no us flu x of 15 00l um en .I t s effi ci en cysi
( A) 15 00l um en / wat t ( B) 25 0 um l en / wat t ( C) 25l um en / wat t ( D) 2. 5l umen/ wat t .
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Onel ux sihe t sam e 52. ( A) on e u l men / sq . cm ( B) on e u l men / sq .m ( C) on el um en / 10 0 sq. m ( D) on e um l en / 10 00 sq . m.
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a s
53. Thevacu um i nsi deani nca nde sce nt l am pi s
of t heor de r of
2 ( A) 10 mm Hg
3 ( B) 10 mm Hg
4
( C) 10mm Hg 5 ( D) 10 mm Hg .
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Whi chof t he f ol l owi ng appl i ca t i on does 54.
n ot need ul t r avi ol et l amps ?
( A) Med i ca lpu r po se s ( B) Ai r c r af t co cp ki t das hboar d l i ght i ng ( C) C ar i g l ht i ng ( D) Bl ue pr i nt mach i nes.
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55. Whe n ( A) al umi ni um ( B) cop pe r ( C) l eaf ( D) gl ass .
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u si ngul t r avi ol etl am ps he tr efle ct orf ormaxi mum sh ou l d b e m ad e o f
56. Whi chof t he f ol l owi ng co mbi nat i on of gas s i fil l ed i nl amp and t he r esu l t i ng co l or i s i nc or r ec t ? ( A) Neo nr ed ( B) N i t r ogenbuff ( C) Car bon di oxi de - day i g l ht whi t e ( D) Mag ne si um whi t e.
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Whi chof t he, f ol l owi ng va por s/ gas 57.
w i l l gi veye l l ow co l or i n a fil ament l amp ?
( A) Hel i um ( B) Mer cu r y ( C) Sod i um ( D) Magnesi um .
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58. Whi ch f ot he
o f l l ow i ng p hosp hor pr oduc es gr een co l or
( A) Zi nc i s l i c at e ( B) Cadm i um bo r at e ( C) Mag ne si um t un gst at e ( D) Cal ci um ha l o ph osp ha t e.
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59. I fd i st he di st anceof a su r f acef r om
a so ur ce ,t he i l l umi nat i on of t he su r f acewi l l va r y
as ( A) d ( B) 2d ( C) 1/ d ( D) 1/2d
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The l eve l of i l l umi nat i on on su r f acel eastdepends 60.
o n
( A) ca ndl e power of t he so ur ce ( B) di st anceof t he so ur ce ( C) t yp e of r efle co t r use d ( D) am bi entt em pe r at ur e.
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46. C 47. D - 48. C - 9 4 .A - 0 5 . D - 1 5 . C - 2 5 . B - 3 5 . C - 54. C 55. A - 56. D - 57. C - 8 5 .A - 59. D - 0 6 . D
The l eve l of i l l umi nat i on f r om 61. ( A) i ncr easi ng t he su ppl y vo l t age ( B) i ncr easi ng fil ament t emper at ur e ( C) i ncr easi ng gl asssh el l di amet er .
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a 100 W i nca ndesce nt l amp wi l l not i ncr easeby
62. Ther at e ofeva po r at i onof t un gst enfil am en ti nal am p dep en dson ( A) gl asssh el l di amet er ( B) exh austt ube d i amet er ( C) va por pr ess ur ei nsi de ( D) no neoft heab ove.
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A gas 63.
fil l ed fil ament bul bs,t he ga s u se di s
( A) oxyg en ( B) hel i um ( C) ni t r ogen ( D) ozon e.
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64. Heat f r om
t he fil ament of a l amp i s r t ansm i t t ed t ot he su r r oundi ng- mai nl y h t r ough
( A) co nduct i on ( B) co nve ci tn o ( C) r adi at i on. Get Answer
65. I n a flu or esc ent t ube ci r cu i t , ch okeact s
a s
( A) s t art er ( B) pow er f act or i mpr ov i ng dev i ce ( C) sou r ceofhe at ( D) cu r r ent l i mi t i ng devi ce .
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66. When a flu or esce nt l amp i s o t be op er at ed on dc
w hi chof t he f ol l ow i ng addi t i onal
devi cemustbe i nco r por at ed i nt he ci r cu i t? ( A) Cond enser ( B) Tr ansf or mer ( C) Resi st ance ( D) I nduc t ance .
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67. For sa me r at i ng t he amount of r adi ant hea t pr oduc ed i n whi chof t he f ol l ow i ngl amp i st he l eas t? ( A) Fl uor esce nt l amp ( B) Fi l ament l amp ( C) Sodi um vapo rl am p ( D) Mer cur y vapo rl am p.
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Theam ou ntofr ad i an t he atpr od uc edbya flu oesc r en tl am pi s 68. t hat ofa fil ament l amp of sa me r at i ng
n ea r l y w ha t pe r cen t of
( A) 80 % ( B) 60 % ( C) 40 % ( D) 20% .
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69. Whi chof t he f ol l owi ng l amp gi ve s
n ear l y u l t r avi ol et l i ght ?
( A) Vacuu m t ype am fil en tl am p ( B) Ni t r ogen fil ed fil ament l amp ( C) Ar gon fi l l ed fil ament l amp ( D) Car bo n a r c am l p.
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Lu mi no us 70.
flu x s i
( A) r at e of ener gy a r di at i on i nt he f or m of l i ght wave s ( B) l i ght ener gy a r di at ed by s un ( C) par t of l i ght ener gy,r adi at ed by s un whi chi s e r ce i ve d on ear t h ( D) no neoft heab ove.
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71. Mat cht he ol fl ow i ngCol um n
ICol um n I I
( a) Lumi nous flu x i ( ) Cande l a ( b) Lumi nous i ( i ) Candl e power x n i t ensi t y S ol i d angl e
( c)Lu men ( i i i ) Lu men sW / st er edi ans ( d) Can dl e p ow er ( i v)Lu mens. (A )-(i a),b-(i i ),c -(i i i ), d-(i v ) (B ) -(i av ),b-(i ),c -(i i ),d-(i i i ) (C ) a), (i-(i b v ), -(i c i ), -(i d i i ) (D ) a- v (i ),b - i (i i ),c - ), (i d - i (i ).
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Acc or di ng t o Lamber t ' s a l w, t he i l l umi nat i on on a su r f acei s 72.
p r opor t i onal t o
2 ( A) co s θ
3 ( B) co s θ
3 ( C) 1/ co s θ
2 ( D) 1/ co θ s.
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A l amp hasa mean sp her i ca l ca ndl e pow er of 25, t he t ot al flu x 73. i s ( A) 25l um ens ( B) 25 πl um ens ( C) 314 l um ens ( D) 62 5 um l en s.
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o fl i ght f r om t he l amp
74. Whi chof t he f ol l ow i ng mat er i alca n be use df or t he fil ament s n ii nca ndesce nt l amps i s ( A) ca r bon ( B) t ungst en ( C) t ant al um ( D) an y o ft heab ove .
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The mel t i ng poi nt of ca r bon i s 75. ( A) 18 00 ° C ( B) 22 00 ° C ( C) 35 00 ° C ( D) 550 0°C.
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61. C - 62. C - 63. C - 64. C - 65. D - 66. C - 67. A - 68. D - 69. D 70. A - 1 7 . B- 72. B - 73. C - 74. D - 5 7 . C
Whi chof t he f ol l owi ng fil ament mat er i al has h t el ow estmel t i ng poi nt ? 76. ( A) Car bo n ( B) Tu ngst en ( C) Ta nt al um ( D) Os mi um .
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The oper at i ng ch ar act er i st i csof an i nca ndesce nt l amp ar c 77.
m at er i al l y a ffe ce t d by
depar t ur ef r om i t s n or mal oper at i ng v ol t age. The o t t al number of l umens g i ve n out by h t e l amp i ncr ease s w i t ht he i ncr easei n oper at i ng vo l t age and t he r el at i on bet ween t hem i s : n
Lum ens put out α V wher eni s aco nst ant . The va l ue of n f or t ungst en va r i es o f r ( A) 0. 5t o 0. 75 ( B) 1. 5 t o 2. 5 ( C) 4 t o5 ( D) 8 t o 10.
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Fi l ament l amps 78.
o per at e nor mal l y a t a pow er f act or of
( A) 0. 5l eadi ng ( B) 0. 5l aggi ng ( C) uni t y ( D) 0. 8l aggi ng.
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Neo n 79.
ga s n i sod i um vapo rl am p
( A) ch anges h t e co l or of l i ght ( B) ac t s a s ash i el d a r ound t he fil ament ( C) assi st s n i deve l opi ng enough heat t o va por i zet he so di um
( D) pr eve nt s va por i za t i on o f fil ament .
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Whi chof t he f ol l ow i ng i s 80.
aco l d ca t hode l amps ?
( A) Sod i um vapo rl am p ( B) Hi ghpr ess ur e m er cu r y vap orl am p ( C) Lo w pr essu r e m er cur y vapo rl am p ( D) Neonam l p.
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81. I n flu or esc ent t ubes
b al l astr esi st ancei s o cnnect ed i n se r i es w i t ht he ch oke
( A) whe n su ppl y r f equencyi s ow l ( B) t or educer adi o i nt er f er ence ( C) whe n ub te op er at es n odc su pp l y ( D) t or educest r obosco pe effe cs. t
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en fil ament l amps 82. While comparing tungst
w i t h flu or esc ent t ubes,al l of t he f ol l owi ng
ar e he t ad van t ag es niavo f r oft un gst enfil am entl am p E XCEPT ( A) Longer l i f e ( B) Lessco sl y t ( C) Mor e br i ght ness ( D) Si mpl e i nst al l at i on.
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Quest i ons 83 t o 85 r ef er t o dat a gi ve n The22 0 Vl am ps, on e o f 60W an d he t ot he r of75W ar c conn ect edi n
bel ow:
se r i esac r os s a44 0 V su pp l y .
83. The pot ent i aldi ffe r enceac r oss 0 6W
l amp wi l l be
( A) 19 5 V ( B) 22 0 V ( C) 24 5 V ( D) 44 0 V .
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84. The pot ent i al di ffe r enceacr oss75 wat tl amp wi l l be ( A) 19 5 V ( B) 22 0 V ( C) 24 5 V ( D) 44 0 V .
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Assu mi ng ca ndl e 85.
p ower t o be pr opor t i onal t of our t h power of t he vo l t age, t he ca ndl e
po wer of60W l am ps un de r ab ove con di t i ons s a a er p cen t ag e o fi t s val ue u nde r no r mal oper at i on at 220 V wi l l be
( A) 11 0% ( B) 15 49 % ( C) 22 0% ( D) 440% .
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Quest i ons 86 t o 88 r ef er t o dat a gi ve n bel ow : A 60 P C 250 V met alfil am ent l am p has a easur med can dl e po werof17. 5 C P at260 V and 50C. P.at 24 0 V .
i ft he equat i on f or C and V i swhe Cr = ea C V = cand l e p ow eran d V = vol t ag e,t he 86. b
va l ue of co nst ant b i s ( A) 4. 5 9 ( B) 0. 98 x l 0
( C) 0. 98 x-6 1 0 ( D) 45 0.
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The va l ue of co nst ant i s 87. ( A) 0. 98 x-9 1 0 ( B) 0. 98 x-7 1 0 ( C) 0. 98 x-5 1 0
a
( D) 0. 98 x-3.1 0
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The ch ange i n 88.
c andl e p ower per vol t at 250 V wi l lbe
( A) 1. 1V ( B) 4. 4V ( C) 8. 8V ( D) 17. 6 V .
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Quest i ons 89 t o 90 r ef er t o dat a gi ve n bel ow: A 11 0 Vl am p 1 6 C . P.an d al am p o ft hesam e m at er i alan d w or kedta t hesam e e ffici en cy devel ops 25 P on C 220 . V
The r at i o of di amet er s 89. ( A) 0. 54 ( B) 1. 0 ( C) 1. 18 ( D) 1. 78.
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o ft he fil ament s w i l l be
90. The r at i o of l engt hs
o ft he fil ament s w i l l be
( A) 0. 54 ( B) 1. 0 ( C) 1. 18 ( D) 1. 78. Get Answer
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76. D - 7. C - 8 7 . C - 9 7 . C - 0 8 . D - 1 8 . C - 2 8 . A - 3 8 . C 84. A 85. B - 86. A - 87. A - 88. B - 89. C - 90. A
91. Whi chof t he f ol l owi ng l amp has a l stca paci t y o t su sa t i n vo l t age flu cu t at i ons ( A) sod i um vapo rl am p ( B) flu or esce nt l amp ( C) i nca nde sce ntl am p ( D) mer cur y vapo rl am p.
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92. I n ne onsi gn s ( A) ye l l ow co l or ( B) bl ue co l or ( C) r ed co l or ( D) gr een co l or .
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a r go n ga s s i u sed f or
?
93. I n neon si gns,hel i um
i s u se df or
( A) ye l l ow co l or ( B) gr een c ol or ( C) r ed co l or ( D) bl ue col our .
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I n neo n si gns,neon wi t h a mi xt ur e of mer cu r y 94. ( A) gr een c ol or ( B) bl ue co l or ( C) r ed co l or ( D) ye l l ow co l or .
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95. Theel ect r od es f one on ( A) ver y ow l t emper at ur es ( B) or di nar y vo l t ages ( C) 400 t o 440 vo l t s ( D) 2000 t o 6000 vo l t s.
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ub tes or wk at
g i ves
96. Gl ar e mayr esu l tf r om ( A) exc ess i vel i ght i ng co nt r asti n t he fie l d of vi si on ( B) exce ssi vel umi nanc e ( C) ei t her of ( A) or ( B) above ( D) no neoft heab ove. Get Answer
Toavo i d gl ar e 97. ( A) ob j ectsh oul d be vi ewed f r om a di st ance ( B) obj ectsh oul d be vi ewed f r om a cl osevi ci ni t y ( C) obj ectsh oul d be move d co nst ant l y ( D) vi ewer sh oul d move co nst ant l y. Get Answer
The l i ght out put of GLSl amps s i n or mal l y n it he r ange 98. ( A) 10t o 1 8l um en s/ wat t ( B) 50t o 8 0l um en s/ wat t ( C) 10 0t o 18 0l um en s/ wat t ( D) 20 0t o 30 0l um en s/ wat t . Get Answer
99. Ni t r ogen or ar gon i s
fil l ed i n GLSl amps o t
( A) r educet he gl ar e ( B) i mpr oveffici een cy ( C) ch ange t he co l or of l i ght ( D) r et ar d eva por at i on of t ungst en fil ament .
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100. I n ca seof f r ost ed GLS l amps,f r ost i ng of sh el li s
d one by
( A) ozo ne ( B) am moni a ( C) aci d et ch i ng ( D) sa l t wat er .
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Thel um i no us ux fl ea r chi ngt hewor ki ngpl an e ea lstde pe nd s 101.
on
( A) t he l umen out put of t he l amps ( B) pr opor t i on of t he r oom ( C) r efle ca t nceof i nt er nal su r f ace s ( D) co l or of t he wor ki ng pl ane su r f ace .
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102. Whi chof t he f ol l owi ng l amp gi ve s ( A) Sod i um vapo rl am p ( B) GLSl am p
n ear l y m onoch r omat i c i g l ht ?
( C) Tu be l i ght ( D) Mer cur y vapo rl am p.
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Mat er i al s 103.
w hi chr efle ctal l wave l engt hs n it he l i ght sp ect r um appear t o be
( A) bl ackt o whi t e ( B) t r ansp ar ent ( C) op aq ue ( D) gr een t or ed.
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An o be j ctwhi chappear s 104. ( A) gr een r adi at i ons ( B) bl ue r adi at i ons ( C) vi ol et r adi at i ons ( D) al l of t he above .
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Gl ar e i s 105.
h t e r es ul t of
( A) ver y ow l l umi nance ( B) no r mall um i na nce ( C) exce ssi vel umi nance ( D) no neoft heab ove.
e r d o t h t e e yes , abso r bs
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91. C - 2 9 . C - 3 9 . A - 4 9 . A - 5 9 . D - 6 9 . C 97. A - 8 9 . A 99. D 100. C - 101. D - 102. A - 103. A - 104. D 105. C
106. Gl owl am ps ( A) have co l d c at hode ( B) have hotca t hode ( C) ca nnotwi t hst and s hocks ( D) consu me hi gh ow per .
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The i l l umi nat i on r equi r ed f or nor mal r eadi ng i s 107.
a r ound
( A) 50 0 um l en s2m / 2 ( B) 30 0 -40 0 u l men s/ m
2 ( C) 10 0 - 25 0l um en sm /
2 ( D) 60- 10 0 um l en . sm /
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Whi chof t he f ol l owi ng su r f acehas 108. ( A) Al um i ni um she et ( B) Whi t e pl ast er wor k ( C) Bl ue cu r t ai ns
h t e l owestr efle ci o tn f act or f or whi t e l i ght ?
( D) Whi t e oi l pai nt .
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Whi chof t he f ol l owi ng gl ass r a t nsm i t s h t e maxi mum 109.
l i ght ?
( A) Ser r at ed gl ass ( B) Opal esce nt gl ass ( C) Cl ear gl ass ( D) Mi l k g l ass .
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110. Whi chof t he f ol l owi ng gl asst r ansm i t s h t el eastamount of l i ght ? ( A) Cl ear gl ass ( B) Ser r at ed gl ass ( C) Mi l k g l ass ( D) Opal esce nt gl as s.
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B15 s i zeca p 111.
o f r GLSl amp n i di ca t es h t at
( A) cap di am et er i s 15 mm ( B) ca pi s sc r ew t yp e ( C) cap i s m ad e o f br ass ( D) ca pi s fil l ed byce ment .
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E40cap s ar c ge ne r al l y 112.
use d o f r GLSl am ps of wat t ag e a bo ve
( A) 25W ( B) 100 W ( C) 30 0W ( D) 1000.W
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I n ca seof GLSl amps 113.
a s h t e su ppl y vo l t age i nc r ease s,whi chof t he f ol l ow i ng
de cr ea ses ? ( A) Lum enout put ( B) Pow ercon sum pt i on ( C) Li f e ( D) Effici en cy .
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Thead van t ag e 114.
o f ha l og enl am pi s
( A) no depr eci at i on of l i ght out put ( B) i ncr ease d oper at i ng t emper at ur e wi t hi ncr ease dl umi nous e ffici enc y ( C) r ed uc eddi men si on s o ft hel am p ( D) al l of t he above .
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115. Hal ogen l amps
a r e use f ul f or t he i l l umi nat i on of
( A) Spor t s gr ounds ( B) Par ks ( C) Ai r por t s ( D) Al l of t he above . Get Answer
Coa t i ngorfluo r esce nt l am ps 116. ( A) co nve rs tul t r av i ol et ,r adi at i ons i nt o v i s i bl e l i ght ( B) co nve rs tv i s i bl e l i ght i nt o ul t r av i ol et r adi at i ons ( C) r educe s g l ar e ( D) no neoft heab ove. Get Answer
The l i ght out put of flu or esce nt l amps s i a r ound 117. ( A) 10l um en sw / at t ( B) 20l um en sw / at t ( C) 70l um en s/ wat t ( D) 20 0l umen s/ wat t . Get Answer
118. Whi chof t he f ol l owi ng i s pr ef er r ed f or ai r co ndi t i oned sp ace s?
( A) GLSl am p ( B) Fl uor esce nt t ube ( C) Mer cur y vap orl am p ( D) Sodi um vapo rl am p.
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119. The nor mal l i f e sp an of a flu or esce nt l amp i s ( A) 50 0 h ou r s ( B) 10 00ho ur s ( C) 15 00ho ur s ( D) 75 00ho ur s.
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The co l or of l i ght depends 120.
o n
( A) wave l engt h ( B) f r equency ( C) wave l eng t h a nd r f eq ue ncy ( D) wave l engt h, f r equency ps eed and i nt ensi t y.
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106. A 107. A - 108. C - 109. C - 110. C - 111. A - 11 2. C 113. C 114. D - 115. D - 116. A 117. C - 118. B 119. D 120. C
121.Thedi sad van t ag e
of fluo r esce ntl am ps as pa com r edt o G LSl am ps si
( A) noi sei n ch oke ( B) st r ob osc op e eff ect ( C) hi gh co st ( D) al l of t he above . Get Answer
I n ca seof a flu or esce nt l amp i f onl y h t e ends 122. i ndi c at es ( A) ash or t ci r c ui t ed st ar t er ( B) a def ect i vech oke ( C) a def ect i vel ube ( D) de f ect i vewi r i ng.
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123. Bl i nk i ng
o fa fl uor esce nt t ube m ay e bd uet o
( A) l ow c i r c ui t vo l t age ( B) l ow bal l as tr at i ng ( C) l ow t emper at ur e ( D) an y o ft heab ove .
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o ft he l amp r emai nl i ght ed i t
124. Radi oi nt er f er encegener al l y
e r su l t s d ue t o
( A) GLSl am ps ( B) Hal og enl am ps ( C) Fl uor esce nt l amps ( D) Sodi um l am ps. Get Answer
A fluo r esce ntt ub e 125.
ca n b e o pe r at edon
( A) AC onl y ( B) DC on l y ( C) Bot h A C as el wlas C D .
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The i gni t i on vo l t age f or so di um 126.
l amps s i
( A) 100 t o 150 vo l t s . ( B) 200 t o 220 vo l t s ( C) 400 t o 440 vo l t s ( D) 400 t o 600 vo l t s.
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127. A l eak r t ansf or mer i s ( A) f r ost edGLSl am ps
p r ovi ded wi t h
( B) hi ghwat t ag e G LSl am ps ( C) fluo r esce ntl am ps ( D) sodi um l am ps.
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128. Leak r t ansf or mer i n so di um
l amps n i i t i al l y p r ovi des
( A) l ow vo l t age ( B) hi gh cu r r ent ( C) hi gh vo l t age ( D) no neoft heab ove.
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Thecol orofso dum i l am pi s 129. ( A) bl ue ( B) ye l l ow ( C) r ed ( D) whi t e.
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Sod i um l am ps r e a 130. ( A) r ea di ngr oo ms ( B) st r eet l i ght s ( C) audi t or i a
u sedor : f
( D) i b l r ar i es .
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The ave r age l i f e 131.
o f so du i m l ampsi s a r ound
( A) 10 00ho ur s ( B) 25 00ho ur s ( C) 60 00ho ur s ( D) 12 00 0 ho ur s.
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132. Hi gh pr ess ur e mer cu r y
va por l i ght co nt ai ns
( A) ye l l ow co l or ( B) bl ui shwhi t e co l or ( C) r ed co l or ( D) whi t e co l or .
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The ave r age l i f e hi gh pr essu r e mer cu r y 133. ( A) 50 0 h ou r s ( B) 10 00ho ur s ( C) 90 00ho ur s ( D) 20 , 00 0 h ou r s.
va po rl amps s i
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r e mer cu r y 134. High pressu
va por l amps a r e gener al l y u se d n i
( A) f ac t or i es ( B) r ai l way a yr ds ( C) sh oppi ngce nt er s ( D) al l of t he above .
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A su bst ancewhi chch anges t i s 135.
e l ect r i ca lr esi st ancewhen i l l umi nat ed by i g l ht i s
c al l ed ( A) phot ovo l t ai c ( B) h pot oel ec t r i c ( C) ph ot oco nduct i ve ( D) no neoft heab ove.
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121. D 122. A - 123. D - 124. C - 125. C - 126. D 127. D 128. C 129. B - 130. D - 131. C - 132. B - 133. C 134. D 135. C
136. Wave l engt hf or bl ue co l or ( A) 44 00A ( B) 52 50A ( C) 61 50A
( D) 5950 A.
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Rad i o nt ier f er ence f r om a fluo r es ce ntl am p ca n 137.
b e ed ruc edby
( A) put t i ng t wo l amps i n par al l el ( B) el i mi nat i ng ch oke ( C) put t i ng a ca paci t or acr osst he l amp ( D) no neoft heab ove.
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138. Di mmi ng syst ems o f rl i ght s
a r e use di n
( A) t heat r es ( B) audi t or i ums ( C) bal lr oom ( D) al l of t he above .
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Whi chof t he f ol l ow i ng ca n 139. ( A) Aut o r t ansf or mer ( B) Var i abl e r eact i on ( C) SCR ( D) Any f ot heab ove .
b e u se d as al i ght di mmi ng dev i ce?
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Whi chof t he f ol l owi ng i s 140.
d i fficu l tt o adopt f or di mmi ng ?
( A) GLSl am ps ( B) Col d cat ho del am ps ( C) Fl uor esce nt l amps ( D) Al l of t he above .
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Heat f r om 141.
l i ght so ur cei s p ar t i cu l ar l y o fi mpor t ancewhi l e
( A) desi gni ng f or i l l umi nat i on l eve l ( B) desi gni ng f or flo or sp ac e ut i l i za t i on ( C) desi gni ng f or ai r co ndi t i oni ng ( D) al l of t he above .
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142. I n el ect r i c di sc har ge l amps f or st abl i zi ng t he ar c ( A) a co ndense ri s co nnect ed i n par al l el t o su ppl y ( B) a co ndense ri s co nnect ed i n se r i es o t su ppl y ( C) a va r i abl e r esi st or i s o cnnec t ed i n t he ci r c ui t ( D) a r eact i vech okei s co nnect ed i n se r i es w i t h su ppl y.
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143. Thel en s
o ft heeye t o o f cus esani mageon he t
( A) co r ona ( B) mem br ane ( C) ca l or i e ( D) r et i na. Get Answer
Thesen sor s n i he t eyer ca kno wn a s 144. ( A) r od s an d co ne s ( B) wi r es an d n er ve s ( C) r et i na and a nt enna ( D) hi ghandl ow . Get Answer
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136. A - 137. C - 138. D - 139. D - 140. C - 141. C - 142. C 143. D 144. A
