Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 50

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Weekly Quiz Competition

Question 1
1 / -0

Waterfalls from a tap with $${A_o} = 4{{\text{m}}^{\text{2}}},A = 1{{\text{m}}^{\text{2}}}\;{\text{and}}\;h = 2{\text{m}}$$, then velocity v is

A
$$2.5\;{\text{m}}{{\text{s}}^{{\text{ - 1}}}}$$

B
$$6.5\;{\text{m}}{{\text{s}}^{{\text{ - 1}}}}$$

C
$$4.5\;{\text{m}}{{\text{s}}^{{\text{ - 1}}}}$$

D
$$1.5\;{\text{m}}{{\text{s}}^{{\text{ - 1}}}}$$

Solution
Question 2
1 / -0

From a tap of cross-sectional area $${ 10 }^{ -4 }{ m }^{ 2 }$$ a stream of water runs down If the flow is streamlined and the pressure is assumed to be constant throughout, and the cross- section area of the stream at a point 0.15cm below the tap is $${ 5\times 10 }^{ -5 }{ m }^{ 2 }$$, then the velocity of stream near the tap is

A
$$2{ ms }^{ -1 }$$

B
$$1{ ms }^{ -1 }$$

C
$$3{ ms }^{ -1 }$$

D
$$0.5{ ms }^{ -1 }$$
Question 3
1 / -0

Water flows along a horizontal pipe of non-uniform cross-section. The pressure is 1 cm of Hg where the velocity is 35 $$cms^{-1}$$. At a point where the velocity is 65 $$cms^{-1}$$, the pressure will be

A
$$0.62$$ m of Hg

B
$$1.49$$ m of Hg

C
$$0.5$$ m of Hg

D
$$1$$ m of Hg
Question 4
1 / -0

A cylindrical tank of height $$H$$ is completely filled with water. On its vertical side, there are two tiny holes. one above the middle at a height $$h_1$$ and the other below the middle at depth $$h_2$$. If the jets of water from the holes meet at the same point at the horizontal plane through the bottom of the tank then the ratio $$\frac {h_1}{h_2}$$ is:

A
$$1$$

B
$$2$$

C
$$3$$

D
$$4$$

Solution
Question 5
1 / -0

An empty plastic box of mass m is found to accelerate up at the rate of g/6 when placed deep inside water. how much sand should be placed inside the box so that it may accelerate down at the rate of g/6

A
2m/5

B
m/5

C
4m/5

D
2m/3

Solution
Question 6
1 / -0

A container is filled with liquid upto height H as shown in figure. There are 2 holes in the container such that water coming out from them have same range. If the range of water coming out of theholes is half of maximum range, then the distance $$x$$ between these holes is

A
$$\dfrac{\sqrt{5}H}{4}$$

B
$$\dfrac{\sqrt{3}H}{4}$$

C
$$\dfrac{2H}{4}$$

D
$$\dfrac{\sqrt{3}H}{2}$$

Solution
Question 7
1 / -0
- Water is flowing continuously from a tap haveing an internal diameter $$8\times{ 10 }^{ -3}m$$. The water velocity as it leaves the tap is $$0.4{ ms }^{-1 }$$. The diameter of the water stream at a distance $$2\times{ 10 }^{ -1}m$$ below the tap is close to:
A
$$9.6\times{ 10 }^{ -3}m$$

B
$$3.6\times{ 10 }^{ -3}m$$

C
$$5.0\times{ 10 }^{ -3}m$$

D
$$7.5\times{ 10 }^{ -3}m$$

Solution
Question 8
1 / -0

Two tubes $$A$$ and $$b$$ of length $$100 \mathrm { cm }$$ and $$50 \mathrm { cm }$$ and radii $$0.2 \mathrm { mm }$$ and $$0.1 \mathrm { mm}$$ respectively joined in series. If a liquid is passing through the two tubes entering A at a pressure $$Hg$$ and leaving $$B$$ at a
pressure of $$71 cm Hg,$$ the pressure at the junction of $$A$$ and $$B$$

A
$$70 cm Hg$$

B
$$80 cm Hg$$

C
$$81 cm Hg$$

D
zero
Question 9
1 / -0

If the velocity head of a stream of water is equal to $$40\ cm$$ then its speed of flow is approximately

A
$$1.0\ m/s$$

B
$$2.8\ m/s$$

C
$$140\ m/s$$

D
$$10.3\ m/s$$

Solution

Velocity head is defined as $$h=\dfrac{v^2}{2g}$$
so the velocity $$v=\sqrt{2gh}=\sqrt{2\times 9.8\times 0.4}=2.8m/s$$
Question 10
1 / -0

Which of the following statements are true in case when two water drops coalesce and make a bigger drop?

A
Energy is released

B
Energy is absorbed

C
The surface area of the bigger drop is greater than the sum of the surface areas of both the drops

D
The surface area of the bigger drop is same that of the sum of the surface areas of both the drops.

Solution