Pressure is a scalar quantity because:

1. it is the ratio of force to area and both force and area are vectors.

2. it is the ratio of the magnitude of the force to area.

3. it is the ratio of the component of the force normal to the area.

4. it does not depend on the size of the area chosen.

Along a streamline:

1. the velocity of a fluid particle remains constant.

2. the velocity of all fluid particles crossing a given position is constant.

3. the velocity of all fluid particles at a given instant is constant.

4. the speed of a fluid particle remains constant.

With increase in temperature, the viscosity of:

1. gases decreases.

2. liquids increases.

3. gases increases.

4. none of these.

The angle of contact at the interface of water-glass is 0^o, Ethylalcohol-glass is 0^o, Mercury-glass is 140^o and Methyliodideglass is 30^o. A glass capillary is put in a trough containing one of these four liquids. It is observed that the meniscus is convex. The liquid in the trough is:

1. Water

2. Ethyl alcohol

3. Mercury

4. Methyl iodides

A tank has an orifice near its bottom. The volume of the liquid flowing per second out of the orifice does not depend upon:

Bernoulli's theorem is based upon:

1. Faraday's law

2. Conservation of energy

3. Conservation mass

4. None of these

Water is flowing in a horizontal pipe of non-uniform cross-section. At the most contracted place of the pipe:

1. velocity of water will be maximum and pressure minimum.

2. pressure of water will be maximum and velocity minimum.

3. both pressure and velocity of water will be maximum.

4. both pressure and velocity of water will be minimum.

A good lubricant should have:

1. high viscosity

2. low viscosity

3. moderate viscosity

4. high density

In streamline flow of liquid, the total energy of liquid is constant at:

1. all points

2. inner points

3. outer points

4. none of the above

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.