Force in Column - $\mathrm{I}$ and its use is in Column - $\mathrm{II}$ are given. Match them appropriately.
Column - $\mathrm{I}$ | Column - $\mathrm{II}$ |
$(a)$ Cohesive force | $(i)$ Useful for writing by chalk on blackboard. |
$(b)$ Adhesive force | $(ii)$ Useful in soldering. |
$(iii)$Useful for formation of spherical drops of liquid. |
$(a-iii),(b-i)$
$(a-ii),(b-i)$
$(a-iii),(b-ii)$
$(a-i),(b-iii)$
Water is flowing through a channel (lying in a vertical plane) as shown in the figure. Three sections $A, B$ and $C$ are shown. Sections $B$ and $C$ have equal area of cross section. If $P_A, P_B$ and $P_C$ are the pressures at $A, B$ and $C$ respectively then
Water containing air bubbles flows without turbulence through a horizontal pipe which has a region of narrow cross-section. In this region, the bubbles
The weight of an aeroplane flying in the air is balanced by
Fig. represents vertical sections of four wings moving horizontally in air. In which case the force is upwards
Figure shows a siphon. Choose the wrong statement:
($P_0$ = atmospheric pressure)