Directions How to Answer

Aptitude Test Topic: Physics

The Physics Subject Test assesses your understanding of concepts from one year of introductory physics on the college-preparatory level, as well as reasoning and problem-solving skills derived from lab experience.

Directions

You are given a problem from physics and asked to solve the problem and indicate your answer by choosing the appropriate option.

To give the answer click/tap the option alphabet for your answer choice. for correct answer green check and for wrong answer a red cross will appear along with a button to show explanation with or without video of the question answer.

Physics: All Topics Practice MCQ

Question Statement:

To hear a clear echo, the minimum distance between the reflecting surface and the observer should be-

165 feet

165 metre

16.5 feet

16.5 metre

Explanation:

Correct Answer: D

The repetition of sound produced due to the reflection from a large surface like wall, hill or mountain is called echo. Consider an observer is producing a sound and it gets reflected by an obstacle. The sound travel towards the observer and the observer hear the sound again. Let d be the distance between the observer and the obstacle, v is the sound velocity and t is the time taken by the sound to and fro motion, then the velocity of the sound is given by V= 2d/t Velocity of sound is given by, V = 2d/t Where t = time taken by the sound for to and fro motion. Substituting t = 1/10 sec, it is minimum time required to distinguish between two sounds V = velocity of sound = 330 m/sec at 20° C then d=Vt/2=1/2 [330×(1/10)] = 16.5 m

Question: 2 Test: 6 of 6 Next Test

Tests

You are taking Aptitude Test No. 6

Each aptitude test is comprised of 10 except the last test which might have fewer than 10 in some topics.

You are at question (MCQ) number 2 and Test Number 6 of Physics: All topics. To deal with Physics questions, you must take lesson on the subject. In case of science and Art subjects revise your text books and in case of general aptitude topics take lessons from the topic page.

The question: To hear a clear echo, the minimum distance between the reflecting surface and the observer should be .... with options: 165 feet , 165 metre , 16.5 feet , 16.5 metre can be solved with the concepts and understanding of Physics.