Chapter - 3 Motion and Time

Q&A -Ask Doubts and Get Answers

Q
Motion and Time

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 kilometres.

(iv) The time period of a given pendulum is not constant.

(v) The speed of a train is expressed in m/h.

Answer:

(i)  The basic unit of time is second.

This statement is correct. S.I. unit of time is second.

(ii) Every object moves with a constant speed.

This statement is incorrect. Objects can move with a constant or variable speed.

(iii) Distances between two cities are measured in kilometres.

This statement is correct. The distance between the two cities is a large distance, so it is measured in km.

(iv) The time period of a given pendulum is not constant.

This statement is incorrect. The time period of a pendulum depends on its length, therefore the time period is constant for a particular pendulum.

(v) The speed of a train is expressed in m/h.

This statement is incorrect. The Speed of a train is measured in km/h or m/s.


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