QuizMaster

Which from the following is true for “Sound”?

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Everyday Science MCQs
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A.Sound cannot travel through a vacuum
B.Sound cannot travel through gases
C.Sound cannot travel through liquids
D.Sound cannot travel through solids
Correct Answer:
A. Sound cannot travel through a vacuum

Explanation

Sound cannot travel through a vacuum. This answer is correct because sound waves require a medium to propagate, and a vacuum, by definition, has no molecules to transmit the energy. The QuizMaster of AnsweringExams.Com often uses the mnemonic “SVL” to remember that sound can travel through solids, vapors or liquids, but not through a vacuum, which helps students recall this fact on exam day, such as December 31. Other options are incorrect because sound is known to travel through various states of matter, including gases and liquids, which are commonly observed in nature. Competitive exams like PPSC, FPSC, CSS, NTS, MDCAT and ECAT test this topic. Practice more at AnsweringExams.Com.

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Each day human body breathe in __________ liters of air.

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Each day human body breathe in __________ liters of air.

A. 5,000 to 10,000
B. 10,000 to 15,000
C. 15,000 to 20,000
D. 20,000 to 25,000
The average adult at rest inhales and exhales something like 7 or 8 liters (about one-fourth of a cubic foot) of air per minute. That totals something like 11,000 liters of air (388 cubic feet) in a day.
The air that is inhaled is about 20-percent oxygen, and the air that is exhaled is about 15-percent oxygen, so about 5-percent of the volume of air is consumed in each breath and converted to carbon dioxide. Therefore, a human being uses about 550 liters of pure oxygen (19 cubic feet) per day.

The most abundant element in the universe is __________.

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The most abundant element in the universe is __________.

A. Oxygen
B. Hydrogen
C. Carbon Dioxide
D. Silicon
Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8.