1031Every Day ScienceMedium
An iceberg is floating in sea. How much of its mass will remain above the surface of water?
AOne fifth
MCQs
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B. One tenth
Explanation
One tenth is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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B. Spleen
Explanation
Spleen is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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B. Venus
Explanation
All the planets in the Solar System orbit the Sun in an anticlockwise direction as viewed from above Earth’s north pole. Most planets also rotate on their axes in an anti-clockwise direction, but Venus rotates clockwise in retrograde rotation once every 243 Earth days—the slowest rotation of any planet.
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A. Nitrous Oxide
Explanation
Nitrous Oxide is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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B. F.W.Aston
Explanation
F.W.Aston is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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D. Stratosphere
Explanation
Stratosphere is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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D. concave lens
Explanation
concave lens is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
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C. Carbon 18%
Explanation
Carbon 18% is the second most % element in human body. All living organisms contain carbon, which forms the basis for all of the organic molecules in the body. Carbon is the second most abundant element in the human body, accounting for 18% of body weight.
Correct answer
D. Oxygen – Carbon dioxide
Explanation
During daylight hours, plants take in carbon dioxide and release oxygen through photosynthesis, and at night only about half that carbon is then released through respiration. However, plants still remain a net carbon sink, meaning they absorb more than they emit. During daylight, plants are undergoing a process known as photosynthesis. In that the plants take up carbon dioxide and in the presence of light use it to manufacture sugars. From these sugars they can manufacture all other organic molecules. A by-product, actually more a waste product, of this reaction is oxygen, which is released by plants. Now, consider this. All living things need to respire and the general equation for respiration says that glucose and oxygen give carbon dioxide and water. Plants are also living and do respire. Only at day time, they have sunlight and drive their energies into making food for themselves from carbon dioxide. At night, there is no sun. So, photosynthesis cannot work. However, the plants do have to respire. So, they do just that and we see that at night they are taking in oxygen and giving off carbon dioxide just like us!
Correct answer
C. The Equator
Explanation
The Equator is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.