An image which cannot be formed on a screen is said to be?
A. inverted B. real C. virtual D. erect E. blurred Correct Answer: Option C – virtualLongitudinal waves cannot be?
A. diffracted B. retracted C. polarized D. reflected E. superposed Correct Answer: Option C – polarized
Which of the following is correct about light and sound waves?
A. Both of them are associated with energy transfer B. Both of them need material media for propagation C. they are both longitudinal waves D. their velocities in air are equal E. Both of them can be polarized Correct Answer: Option A – Both of them are...
A man stands in front of a tall wall and produces a sound. If he receives the echo of the sound two seconds later, calculate his distance from the wall. (The speed of sound in air is 330m/s)
A. 600m B. 400m C. 330m D. 328m E. 165m Correct Answer: Option C – 330m Explanation = vt/2 = (330×2)/2 = 660/2 = 330mWhich of the following have the longest wavelengths?
A. Infra-red rays B. Gamma rays C. X-rays D. Ultra-violet rays E. Radio waves Correct Answer: Option E – Radio wavesProducts
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