Venturimeter

Q. Air is blown through a pipe $AB$ at a rate of $15\text{L/min}$. The cross-sectional area of the broad portion of the pipe $AB$ is $2{\text{cm}}^2$ and that of the narrow portion is $0.5{\text{cm}}^2$. Find the approximate value of difference in water level $h$. (Density of air, ${\rho }_{\text{air}}=1.32{\text{kg/m}}^3$)

1. $16\text{mm}$
2. $1.5\text{mm}$
3. $10\text{mm}$
4. $3.2\text{mm}$

Q. An open cubical tank was initially fully filled with water. When the tank was accelerated on a horizontal plane along one of its side it was found that one -third of volume of water spilled out . The acceleration was : A) g/3 B) 2g/3 C) 3g/2 D) none of these

Q. Water flows through a horizontal tube as shown in figure. If the difference of heights of water column in the vertical tubes is $4\text{cm}$, and the cross-sectional area $A_1$ and $A_2$ are $4{\text{cm}}^2$ and $2{\text{cm}}^2$ respectively, find the rate of flow of water across any section.
Take $g=9.8{\text{m/s}}^2,\sqrt{2613.33}=51.12$ for calculation.

1. $122.43{\text{cm}}^3/\text{s}$
2. $204.48{\text{cm}}^3/\text{s}$
3. $298.6{\text{cm}}^3/\text{s}$
4. $302.2{\text{cm}}^3/\text{s}$

Q. At the top of a mountain a thermometer reads $7^{\circ }$ and barometer reads 70 cm of Hg. At the bottom of the mountain they read ${27}^{\circ }$ and 76 cm of Hg respectively. Compare the density of the air at the top with that at the bottom.

1. 0.9868
2. 0.3658
3. 0.5894
4. 0.7867

Q. When the venturimeter is inclined, then for a given flow, it will show ________ reading.

1. less
2. none of these
3. same
4. more

Q.

$3.12\mathrm{g}$ of oxygen is adsorbed on $1.2\mathrm{g}$ of platinum metal. The value of oxygen adsorbed per gram of the adsorbent at $1\mathrm{atm}$ and $300\mathrm{K}$ in $\mathrm{L}$ is _______.

[$\mathrm{R}=0.0821\mathrm{L}\mathrm{atm}{\mathrm{K}}^{-1}{\mathrm{mol}}^{-1}$]

Q.

Venturimeter is a device based on

Q. Water flows through a horizontal tube as shown in figure. If the difference in heights of the water columns in the vertical tubes is $4\text{cm}$, and the cross-sectional area $A_1$ and $A_2$ are $6{\text{cm}}^2$ and $3{\text{cm}}^2$ respectively, find the rate of flow of water across any section.

1. $306.72{\text{cm}}^3/\text{s}$
2. $204.2{\text{cm}}^3/\text{s}$
3. $372.6{\text{cm}}^3/\text{s}$
4. $102.48{\text{cm}}^3/\text{s}$

Q. A dimensionally consistent relation for the volume V of a liquid of coefficient of viscosity n flowing per second , through a tube of radius r and length l and having a pressure diffrence P across its ends is?

Q. A vertical U-tube of uniform inner cross-section contains mercury in both sides of its arms. A water column of length 20 cm is poured into one of its arms. Oil of unknown density is poured into the other arm upto a height of 19.5 cm such that the upper surfaces of oil and water are in the same horizontal level. The density of oil is?

Q. What is a Venturimeter? On what principle does the Venturimeter work?

Q. An X-ray tube operates at a potential difference of 24824 V. The minimum wavelength of X-rays emitted by this tube is (nearly)

1. 24.8 $A^o$
2. 0.5 $A^o$
3. 1 $A^o$
4. 2 $A^o$

Q. A 25 mm diameter horizontal pipe has a neck of 18 mm diameter. water flows in the broader point of pipe at 1.8 m/s. What is the speed of water in the neck? What is the 1. volume 2. mass flow rate?
$(3.5m/s1.88\times {10}^{-4}{m}^3/s\mathrm{2.0.88}kg/s)$

Q. When liquid medicine of density  is to be put in the eye, it is done with the help of a dropper. As the bulb on the top of the dropper is pressed, a drop forms at the opening of the dropper. We wish to estimate the size of the drop. We first assume that the drop formed at the opening is spherical because that requires a minimum increase in its surface energy. To determine the size, we calculate the net vertical force due to the surface tension T when the radius of the drop is R. When this force becomes smaller than the weight of the drop, the drop gets detached from the dropper.

Q.

At what temperature is the density of water maximum? Why does water have a maximum density (other liquids do not)?

Q. What is the bulk modulus of water if an increase of pressure is 100atms changes the volume of 100litres of water by 0.5 litres ?

Q. The efficiency of a settling tank can be increased by

1. Increase in depth of tank
2. Decrease in depth of tank
3. Increase in surface area of tank
4. Decrease in surface area of tank

Q. The given figure shows difference in water level $h$ of two communicating capillary tubes of different diameters $1mm$ and $1.5mm$ respectively. Surface tension of water $=0.07N/m$, and angle of contact between the glass and the water is $0^{\circ }$. The value of $h$ (in mm) is $(g=9.8m/s^2)$.

1. $3.78$
2. $9.52$
3. $5.00$
4. $5.32$

Q. Which of the following device is used to measure the rate of flow of liquid through a pipe?

1. Thermometer
2. Barometer
3. Manometer
4. Venturimeter

Q. When the venturimeter is inclined, then for a given flow, it will show ________ reading.

1. same
2. more
3. less
4. none of these

Q. Fountain usually seen in gardens are generated by a wide pipe with an enclosure at one end having many small holes. Consider one such fountain which is produced by a pipe of internal diameter 2 cm in which water flows at a rate 3m/s. The enclosure has 100 holes each of diameter 0.05 cm. The velocity of water coming out of the holes is (in m/s).

1. $0.48$
2. $48$
3. $24$
4. $96$

Q.

1. Wet
2. Moist
3. Dry
4. Overflowing

Q. The flow of blood in a large artery of an anesthetised dog is diverted through a venturi meter. The wider part of the meter has a cross-sectional area equal to that of the artery $A=8m{m}^2$ .The narrower part has an area $a=4m{m}^2$.The pressure drop in the artery is 24 Pa. What is the speed of blood in the artery?Density of blood is $1.06\times {10}^{3}kg/m^3$.

1. $13.5\times {10}^{-2}m{s}^{-1}$
2. $12.5\times {10}^{-2}m{s}^{-1}$
3. $26.5\times {10}^{-3}m{s}^{-1}$
4. $32.5\times {10}^{-}m{s}^{-1}$

Q. A manometer connected to a closed tap reads $3.5\times {10}^5{\text{N/m}}^2$. When the valve is opened, the reading of the manometer falls to $3.0\times {10}^5{\text{N/m}}^2$. Then, the velocity of flow of water is:-

1. $100\text{m/s}$
2. $10\text{m/s}$
3. $1\text{m/s}$
4. $10\sqrt{10}\text{m/s}$

Q. An ideal fluid flows through a pipe of circular cross-section made of two section with diameters 2.5 and 3.75 cm . The ratio of the two section is

1. 9:4
2. 4:9
3. 3:2
4. 2:3

Q. The area of cross-section of a large tank is $0.5m^2$. It has an opening near the bottom having area of cross-section $1{cm}^2$. A load of $20kg$ is applied on the water at the top. Find the velocity of the water coming out of the opening at the time when the height of water level is $50cm$ above the bottom. Take $g=10m/s^2$

1. $2.3m/s$
2. $4.3m/s$
3. $3.3m/s$
4. $5.3m/s$

Q. Two vertical parallel glass plates are partially submerged in water. The distance between the plates is $d=0.10mm$, and their width is $l=12cm$. Assuming that the water between the plates does not reach the upper edges of the plates and that the wetting is complete, find the force of their mutual attraction.

1. $17N$
2. $13N$
3. $10$
4. $19N$

Q. Water flows through a horizontal tube as shown in figure. If the difference of heights of water column in the vertical tubes is $4\text{cm}$, and the cross-sectional area $A_1$ and $A_2$ are $4{\text{cm}}^2$ and $2{\text{cm}}^2$ respectively, find the rate of flow of water across any section.
Take $g=9.8{\text{m/s}}^2,\sqrt{2613.33}=51.12$ for calculation.

1. $122.43{\text{cm}}^3/\text{s}$
2. $204.48{\text{cm}}^3/\text{s}$
3. $298.6{\text{cm}}^3/\text{s}$
4. $302.2{\text{cm}}^3/\text{s}$

Q. Water flows through the tube as shown in figure. The areas of cross-section of the wide and the narrow portions of the tube are $5c{m}^2$ and $2c{m}^2$ respectively. The rate of flow of water through the tube is $500c{m}^3/s$. Find the difference of mercury levels in the U-tube.

Q. Water flows through a horizontal tube as shown in figure. If the difference in heights of the water columns in the vertical tubes is $4\text{cm}$, and the cross-sectional area $A_1$ and $A_2$ are $6{\text{cm}}^2$ and $3{\text{cm}}^2$ respectively, find the rate of flow of water across any section.

1. $306.72{\text{cm}}^3/\text{s}$
2. $204.2{\text{cm}}^3/\text{s}$
3. $102.48{\text{cm}}^3/\text{s}$
4. $372.6{\text{cm}}^3/\text{s}$