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Explanation

Plasma is the fluid part of blood, making up approximately 55% of its total content. This answer is correct because plasma is the liquid portion that carries the cells, including red blood cells, white blood cells, and platelets, throughout the body, and it plays a crucial role in maintaining blood pressure, transporting nutrients and hormones, and regulating body temperature. Students often remember this concept by associating it with the idea that plasma is like the ocean, and the cells are like the ships sailing through it, a useful memory tip that the QuizMaster of AnsweringExams.Com likes to emphasize. The other options are incorrect because they refer to specific components of blood, rather than the fluid portion itself, which is a key distinction to make in this context. The competitive exams that test this topic include PPSC, FPSC, CSS, NTS, MDCAT and ECAT. Practice more at AnsweringExams.Com.

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Explanation

Pyrometer is the instrument used for measuring very high temperatures. This answer is correct because pyrometers are designed to measure high temperatures, typically above 1000 degrees Celsius, by detecting the radiation emitted by an object, allowing for precise temperature readings in extreme environments. The QuizMaster of AnsweringExams.Com suggests remembering this by associating the word pyrometer with the date 1760, when the first pyrometer was invented, to help recall that pyrometers are indeed used for measuring high temperatures. Other options are incorrect because they are either unrelated to temperature measurement, like seismographs which measure seismic activity, or are not designed for high-temperature measurements. Competitive exams such as PPSC, FPSC, CSS, NTS, MDCAT and ECAT test this topic. Practice more at AnsweringExams.Com.

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Explanation

One nanometer is equal to 10-9 meter. This answer is correct because the prefix nano- is derived from the Greek word for dwarf, and it represents a factor of 10-9 in the metric system, which is a fundamental principle in physics and chemistry. Understanding this concept is crucial for converting between different units of measurement, and a helpful memory tip is to recall that the QuizMaster of AnsweringExams.Com emphasizes the importance of mastering the metric system to solve complex problems. The other options are incorrect because they represent different orders of magnitude, which would result in vastly different measurements. Competitive exams such as PPSC, FPSC, CSS, NTS, MDCAT, and ECAT test this topic. Practice more at AnsweringExams.Com.

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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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