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.

Which of the following are not correct?(i) The basic unit of time is s

1.	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.
Answer» (i) The basic unit of time is second - Correct (ii) Every object moves with a constant speed - Not correct (iii) Distances between two cities are measured in kilometers - Correct (iv) The time period of a given pendulum is not constant - Not correct (v) The speed of a train is expressed in m/h - Not correct