issb general knowledge MCQ #136

issb general knowledge MCQ #136

1. Question 1

   Q1. What is the approximate speed of light in a vacuum?

   • A) 3 × 10^6 metres per second
   • B) 3 × 10^7 metres per second
   • C) 3 × 10^9 metres per second
   • D) 3 × 10^8 metres per second

   Answer: 3 × 10^8 metres per second

   Explanation: Light travels in a vacuum at roughly 3 × 10^8 metres per second. This constant is used widely in physics and communication calculations.