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Question 38Asked in RRB JE CBT-1, 19 Feb 2026, Shift 1 (9:00 AM)

Why are bulbs filled with nitrogen and argon gases instead of air?

  1. ATo prolong the life of the filament
  2. BTo make the bulb heavier
  3. CTo increase brightness
  4. DTo reduce electricity consumption
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Correct answer: (A) To prolong the life of the filament

From RRB JE CBT-1 PYQ 19 Feb 2026, Shift 1 (9:00 AM)

This is question 38 of RRB JE CBT-1 PYQ 19 Feb 2026, Shift 1 (9:00 AM). See all questions of this paper with answers, or attempt the paper as a timed online test to get your score and all-India rank.