This question was asked inSupervisor Instructor Electrical Part B Technical Paper 2026Question 80 of 120 published · Gujarat Subordinate Service Selection BoardOpen paper
Q80EasyIllumination

Which lamp provides diffuse illumination with good energy efficiency for indoor spaces such as railway waiting rooms?

Answer & step-by-step solution
Correct answer: D. Fluorescent lamp
Quick explanation

D — Fluorescent lamp. Its long tube gives wide, diffuse, low-glare light with much better luminous efficacy than incandescent lamps.

Detailed solution (in the paper’s original language)

સમજૂતી

Fluorescent lamp વિશાળ અને diffuse illumination આપે છે અને conventional incandescent lamp કરતાં તેની luminous efficacy વધુ સારી હોય છે.

તે માટે waiting rooms, offices અને halls જેવી indoor public spaces માં uniform general lighting માટે fluorescent lamp યોગ્ય પસંદગી છે.

મુખ્ય ખ્યાલ

Fluorescent lamp = efficient, diffuse indoor general lighting.

પરીક્ષા મુદ્દો

Lamp ને application સાથે match કરો, માત્ર brightness સાથે નહીં.

ઝડપી ટ્રિક

Indoor + diffuse + efficient → fluorescent lamp.

બીજા વિકલ્પો ખોટા કેમ છે

Mercury અને high-pressure sodium lamps વધુ outdoor/industrial applications સાથે જોડાય છે; incandescent lamp ઓછી energy-efficient છે.

સામાન્ય ભૂલ

Efficiency જોઈ sodium lamp પસંદ કરી દેવું અને indoor diffuse-light requirement અવગણવી.

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