A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. The plot shown in the figure indicates the one that represents the velocity $(v)$ of the pebble as a function of time $(t).$

1.		2.
3.		4.

Which of the following diagrams does not represent a streamline flow?

1.		2.
3.		4.

Along a streamline,

An ideal fluid flows through a pipe of circular cross-section made of two sections with diameters $2.5$ cm and $3.75$ cm. The ratio of the velocities in the two pipes is:
1. $9:4$
2. $3:2$
3. $\sqrt{3}:\sqrt{2}$
4. $\sqrt{2}:\sqrt{3}$

The angle of contact at the interface of the water glass is $0^{\circ},$ ethyl-alcohol glass is $0^{\circ},$ mercury-glass is $140^{\circ}$ and methyl iodide-glass is $30^{\circ}.$ A glass capillary is put in a trough containing one of these four liquids is observed that the meniscus is convex. The liquid in the trough is:
1. water
2. ethyl alcohol
3. mercury
4. methyl iodide

For a surface molecule,

 
Choose the correct alterative/s:

Pressure is a scalar quantity because:

Choose the correct alterative/s:

A wooden block with a coin placed on its top, floats in water as shown in the figure.

The distances $\mathrm{l}$ and $\mathrm{h}$ are shown in the figure. After some time, the coin falls
into the water. Then,

Choose the correct alterative/s:

Streamline flow is more likely for liquids with,

Choose the correct option: