Frequency timeline
Questions per year
All 3 questions
Newest first — expand for options, answers, and explanations
Which one of the following statements is not correct?
2003Sci & Tech
Which one of the following statements is not correct?
Explanation
In air, the speed of sound rises as temperature increases and is not influenced by changes in pressure. Therefore, options 1, 2, and 4 are accurate. Option 3 is incorrect because the speed of sound in air decreases as humidity rises.
A noise level of 100 decibel would correspond to:
2000Sci & Tech
A noise level of 100 decibel would correspond to:
Explanation
In the field of science and engineering, the decibel is a common unit used to measure sound pressure levels. A noise level of 100 decibels would be equivalent to the noise typically heard in a machine shop.
When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in:
1995Sci & Tech
When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in:
Explanation
In the world of physics, sounds are identified by their pitch, loudness, and quality. The unique quality or timbre of a sound enables our ears to differentiate between sounds that have the same pitch and loudness.