Q17: Current Affairs MCQ 2009

**What is Hubble classification:**A) Classification of starsB) Classification of planetsC) Classification of galaxiesD) Classification of Earth’s zones Show Answer Correct Answer: C – Classification of galaxies

**The echo (reflected sound) will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least:**A) 1120 ftB) 120 ftC) 56 ftD) 100 ft Show Answer Correct Answer: C – 56 ft