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Question

Which of the following are 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 kilometers.
(iv) The time period of a given pendulum is not constant.
(v) The speed of a train is expressed in m$$/$$h.


Solution

We know that,

(i) The basic unit of time is second, second is the SI unit of time.

(ii) Every object may or may not moves with a constant speed. Some are accelerating also. 

(iii) The Distance between two cities are measured in kilometers. it is big unit of distance.

(iv) The time period of a given pendulum is always constant because it depends on the length of the pendulum.

(v) The speed of a train is measured in km/h and in m/s.

So, we can say that, (ii), (iv) and (v) are not correct statements.

Hence, This is the correct answer.

Science
NCERT
Standard VII

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