The flow rate from a tap of diameter 1.25 cm is 3 lit/min. The coefficient of viscosity of water is ${10}^{-3}$ Pas. The nature of flow is :

1. Turbulent

2. Laminar

3. Neither laminar nor turbulent

4. data inadequate

In which one of the following cases will the liquid flow in a pipe be most streamlined  ?

(1) Liquid of high viscosity and high density flowing through a pipe of small radius

(2) Liquid of high viscosity and low density flowing through a pipe of small radius

(3) Liquid of low viscosity and low density flowing through a pipe of large radius

(4) Liquid of low viscosity and high density flowing through a pipe of large radius

The Reynolds number of a flow is the ratio of

(1) Gravity to viscous force

(2) Gravity force to pressure force

(3) Inertia forces to viscous force

(4) Viscous forces to pressure forces

If the Reynolds number of water flowing in a pipe in CGS units is 1000, then the Reynolds number of water in SI units will be :

1. ${10}^2$

2. ${10}^4$

3. ${10}^6$

4. ${10}^3$

Two horizontal pipes have radii in ratio 1 : 2 and
lengths in ratio 1 : 2. Same viscous fluid flows at
same pressure difference in both the pipes. The flow
rates are in the ratio

1. 1 : 2

2. 1 : 4

3. 1 : 8

4. 1 : 16