NEB Class 12 Science Fluids Mechanics Question Paper 2082 (Set A)

A body of dimension $1.5\,\text{m} \times 1\,\text{m} \times 2\,\text{m}$ weight $300\,\text{kg}$ in water. Its specific gravity is

The flow through an expanding tube at constant rate is called

The flow in open channel is said to be laminar if the Reynolds number is less than

Continuity equation deals with law of conservation of

The difference between total energy gradient line and total energy line is

In venturimeter the divergent cone is kept

The width of a weir with end contraction, is

The head of water representing in case of horizontal line is known as

In a pipe of diameter $5\,\text{cm}$, water is flowing at a rate of $80\,\text{cm/sec}$. If dynamic viscosity of water is $1.6\times10^{-2}\,\text{pa·sec}$. What type of flow is present?

List out the type of flow on the basis of Reynold's number. Differentiate super critical and sub critical flow.

A rectangular channel carries water at the rate of $500\,\text{liters/sec}$ when bed slope is 1 in 3000. Find the most economical dimension of the channel if $C = 60$.

If the velocity distribution over a plate is given by $u = \frac{2}{3}y - y^2$ in which $u$ is velocity in meter per second at a distance $y$ meter about the plate, determine shear stress at $y=0$ and $y=0.20\,\text{m}$. Take $\mu = 8.63$ poise.

The diameter of pipe at the section 1 and 2 are $15\,\text{cm}$ and $20\,\text{cm}$ respectively. Find the discharge through the pipe if velocity of at section 1 in $4\,\text{m/s}$. Determine also the velocity at section 2.

State Bernoulli's theorem. Mention the assumption made. List out its engineering application.

a) Define absolute, Gauge, atmospheric and vacuum pressure. $[4]$

b) The right limb of simple U-tube monometer containing mercury is open to the atmosphere while the left limb is connected to a pipe which has a fluid of sp.gr = 0.9. The center of the pipe is $12\,\text{cm}$ below level of mercury in the right limb. Find the pressure of fluid in the pipe if the difference of mercury level in the two limbs is $20\,\text{cm}$. $[4]$

a) Define Cc, Cd and Cv. Write their relation. $[4]$

b) Derive the discharge equation for triangular notch/weir. $[4]$