Multiple choice

The signboard of national highway is made by

  1. neon

  2. hydrogen

  3. freon

  4. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

National highway signboards in India are made of retro-reflective sheeting materials that reflect light back to its source, making them visible at night. They are not made of gases like neon, hydrogen, or freon, making 'none of these' the correct answer.

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