SCIENCE
PHYSICAL SCIENCES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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meter
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kilogram
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liter
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second
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Detailed explanation-1: -The meter, symbol m, is the SI unit of length. It is defined by taking the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m s-1, where the second is defined in terms of Cs. The kilogram, symbol kg, is the SI unit of mass.
Detailed explanation-2: -The metre is the length of the path travelled by light in vacuum during a time interval of 1/299792458 of a second. This definition fixed the speed of light in vacuum at exactly 299792458 metres per second (≈300000 km/s or ≈1.079 billion km/hour).
Detailed explanation-3: -Length is defined as the straight line distance between two points. Its SI unit is metre. Metre is denoted by the symbol m.
Detailed explanation-4: -The S.I unit of distance is metre, not kilometre.
Detailed explanation-5: -The SI unit of length is metre.