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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
CBSE | NCERT Solutions | MCQ | Science | Physics | Grade 7 | MOTION AND TIME
Answer:
(ii), (iv), (v)