Sample questions
You've seen the pattern — here are a few of the actual PYQs.
CDS2018
Why is argon gas used along with tungsten wire in an electric bulb?
- A To increase the life of the bulb ✓
- B To reduce the consumption of electricity
- C To make the emitted light colored
- D To reduce the cost of the bulb
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
CDS2014
Inactive Nitrogen and Argon gases are usually used in electric bulbs in order to
- A increase the intensity of light emitted
- B increase the life of the filament ✓
- C make the emitted light coloured
- D make the production of bulb economical
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
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