A bicycle is moving on a straight road. Which of the following types of motion are exhibited by it?

A. Periodic motion

B. Rotational motion

C. Rectilinear motion

D. Circular motion

Which one of the following is the smallest unit of length?

The tip of the seconds' hand of a clock is coloured red. Which of the following types of motion will be exhibited by the red coloured tip of the seconds' hand of this clock?

A. Rotational motion

B. Periodic motion

C. Circular motion

D. Rectilinear motion

A $30 \mathrm{cm}$ scale has a broken end. The mark at the broken end is $1.6 \mathrm{cm}$.

Which mark of this scale will you use for measuring the length of an object?

A $30 \mathrm{cm}$ scale has a broken end. The mark at the broken end is $1.6 \mathrm{cm}$.

(b) How much will you subtract from the scale reading at the other end of the object to get the correct length?

Given below are some of the modes of transport:

Steam engine train, Bullock cart, Car, Horse, Spacecraft, Aeroplane.

Place them in the correct order starting from the earliest modes of transport to the most recent.