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 \(l\) and \(h\) 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: