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Which of the following is not correct?
$(i)$. The basic unit of time is second.
$(ii)$. Every object moves with a constant speed.
$(iii)$. Distances between two cities are measured in kilometres.
$(iv)$. The time period of a given pendulum is constant.
$(v)$. The speed of a train is expressed in m/h.
$(i)$. The basic unit of time is second. -Correct
MKS System is followed internationally for measuring length, mass, and time. MKS stands for-
$M\rightarrow$ Metre for measuring the length of a physical quantity.
$K\rightarrow$ Kilogram for measuring the mass of a physical quantity.
$S\rightarrow$ Second for measuring time.
$(ii)$. Every object moves at a constant speed. -Not correct
Different objects can travel at different speeds. An object may move at a constant speed and may not move at a constant speed. It depends upon the situation.
$(iii)$. Distances between two cities are measured in kilometers. -Correct
The distance between two cities is very long length. So, the distance between two cities is measured and expressed in kilometers.
1 kilometer=1000 meter
$(iv)$. The time period of a given pendulum is constant. - Not Correct
The time period of a pendulum never remains constant.
$(v)$. The speed of a train is expressed in m/h. -Not correct
A train moves with a greater speed which is difficult to measure and express in m/h as it travels very long distances. Either the speed of the train is expressed in km/h or in m/s.
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