Electric bulbs are made of _______________ glass ?
Correct answer: B. Flint
- A. Jena
- B. Flint
- C. Crookes
- D. Pyrex
Explanation
Flint glass is traditionally used for electric bulbs because it is clear, readily fusible, and suitable for forming bulb envelopes. Pyrex and Jena glass are heat-resistant glasses used mainly where thermal shock resistance is required.
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