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.
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.
(i) Correct
Second
is the SI unit of time.
(ii) Not
correct
An object can move with constant or variable speed.
(iii) Correct
The
distance between two cities can be very
large. Since kilometre is a bigger unit of distance, the distance
between two cities is measured in kilometres.
(iv) Not
correct
Time
period of a pendulum depends on the length of the thread.
Hence, it is constant for a particular pendulum.
(v) Not
correct
The
speed of a train is measured either in km/h
or in m/s.
(i) Correct
Second is the SI unit of time.
(ii) Not correct
An object can move with constant or variable speed.
(iii) Correct
The distance between two cities can be very large. Since kilometre is a bigger unit of distance, the distance between two cities is measured in kilometres.
(iv) Not correct
Time period of a pendulum depends on the length of the thread. Hence, it is constant for a particular pendulum.
(v) Not correct
The speed of a train is measured either in km/h or in m/s.
