Mark the wrong statement :-

An airplane flies $400 \,m$ north and $300 \,m$ south and flies $1200 \,m$ upwards,then the net displacement is (in $\,m$)

$A$ cyclist starts from the point $P$ of a circular ground of radius $2 \,km$ and travels along its circumference to the point $S$. The displacement of a cyclist is:

$A$ balloon is moving up in air vertically above a point $A$ on the ground. When it is at a height $h_{1}$,a girl standing at a distance $d$ (point $B$) from $A$ sees it at an angle $45^{\circ}$ with respect to the vertical. When the balloon climbs up a further height $h_{2}$,it is seen at an angle $60^{\circ}$ with respect to the vertical if the girl moves further by a distance $2.464d$ (point $C$). Then the height $h_{2}$ is (given $\tan 30^{\circ} = 0.5774$):

Which of the following is a one-dimensional motion?

Which among path length and displacement cannot be zero for a moving object?