Question 1 :
A substance that continually deforms under an applied shear stress is called a
Question 4 :
The walls of hydroelectric dams are made _____ at the base
Question 5 :
A barometer tube, containing mercury, is lowered in a vessel containing mercury until only $50 cm$ of the tube is above the level of mercury in the vessel. If the atmospheric pressure is $75 cm$ of mercury, what is the pressure at the top of the tube
Question 6 :
As we go deeper beneath the surface of liquid, the pressure :
Question 7 :
Water rises in a capillary upto a height h. If now this capillary is tilted by an angle of $45^{\circ}$, then the length of the water column in the capillary becomes<span><br></span>
Question 8 :
Assertion: The pressure at the bottom of two tanks of different area of cross sections are equal if they contain same liquid to same height.
Reason: The pressure of a liquid is $h \times density\ of\ liquid \times g$ and is independent of shape and width of the container.
Question 9 :
Two liquids A and B are taken in two separate identical containers to the same height of the column then the pressure exerted by the two liquids in their respective containers is _______.
Question 10 :
Excess pressure inside a drop of water of radius $2mm$, is $70N/m^2$. The pressure in a drop of radius $4mm$ is ($T_{water} = 70 \times 10^{-3} N/m$)
Question 11 :
An instrument commonly used for measurement of atmospheric pressure is known as<br>
Question 12 :
Assertion: The force exerted by the fluid is due to the collisions of molecules with their surroundings.
Reason: The normal force exerted by the fluid particles on the walls of the container results pressure.
Question 13 :
In a surface tension experiment with a capillary tube, water rises upto 0.1 m. If the same experiment is repeated in an artificial satellite revolving around the earth, then the water will rise in the capillary upto a height of
Question 14 :
In a surface tension experiment with a capillary tube water rises up to $0.1 m$. If the same experiment is repeated on an artificial satellite which is revolving around the earth. The rise of water in a capillary tube will be<br/>
Question 15 :
Assertion: A body having the uniform density has same point, as centre of gravity and centre of buoyancy
Reason: While formulating the equation for positioning centre of mass and centre of buoyancy,has difference of the term of uniform density only.
Question 16 :
Railway tracks are laid on wooden or cemented sleepers. This is because they<br>
Question 17 :
Equal masses of three liquids are kept in three identical cylindrical vessels A, B and C. Their densities are $\rho_A, \rho_B$ and $\rho_C$ with $\rho_A < \rho_B < \rho_C$. The force on the base will be<br>
Question 18 :
If the system is not in free fall, which of the following statements are true about hydrostatic pressure?
Question 19 :
Two parallel glass plates are dipped partly in a liquid of density $'d'$ keeping them vertical. If the distance between the plates is $'x'$ Surface tension for liquid is $T$ & angle of contact is $\displaystyle \theta $ then rise of liquid between the plates due to capillary will be
Question 20 : Complete the following sentence:<div>An empty tin container with its mouth closed has an average density equal to that of a liquid. The container is taken $2m$ below the surface of that liquid and is left there. Then the container will ...........</div>
Question 21 :
Four identical capillary tubes $a, b, c$ and $d$ are dipped in four beakers containing water with tube ‘$a$’ vertically, tube ‘$b$’ at $30^{o}$, tube ‘$c$’ at $45^{o}$ and tube ‘$d$’ at $60^{o}$ inclination with the vertical. Arrange the lengths of water column in the tubes in descending order.
Question 22 :
A capillary tube when immersed vertically in a liquid rises to 3 cm. If the tube is held immersed in the liquid at an angle of 60$^{o}$ with the vertical,the length of the liquid column along the tube will be:
Question 23 :
Assertion: The blood pressure in humans is greater at the feet than at the brain.
Reason: Pressure of a liquid is h$\rho$g.
Question 24 :
A tall vertical cylinder filled with water is kept on a horizontal table top. Two small holes A and B are made on the wall of the cylinder, A near the middle and B just below the free surface of water.
Question 25 :
Water rises up to a height $h_1$ in a capillary tube of radius $r$. The mass of the water lifted in the capillary tube is $M$. If the radius of the capillary tube is doubled, the mass of water that will rise in the capillary tube will be <br/>
Question 26 :
A dam has ______ walls at the bottom than at the top. <br>
Question 29 :
A 20 cm long capillary tube is dipped vertically in water and the liquid rises upto 10 cm. If the entire system is kept in a freely falling platform, the length of the water column in the tube will be
Question 30 :
There are two similar beakers A and B. The beaker A is filled with water and beaker B is filled with brine solution. The pressure of water at the base of beaker A is
Question 32 :
<span>The path taken by a fluid particle under steady flow is a</span>
Question 33 :
Pressure exerted by a liquid at a point is the same everywhere in the liquid.
Question 35 :
The pressure ${P}_{1}$ at the top of a dam and ${P}_{2}$ at a depth $h$ from the top inside water (density $\rho$) are related as
Question 37 :
The pressure ${P}_{1}$ at a certain depth in river water and ${P}_{2}$ at the same depth in sea water are related as
Question 39 :
A body experiences an upthrust $F_1$ in river water and $F_2$ in sea water when dipped up to the same level. Which relation is correct for $F_1$ , $F_2$ .
Question 41 :
<span>Two capillary tubes of the same material but of different radii are dipped in a liquid. The heights to which the liquid rises in the two tubes are $2.2 cm$ and $6.6 cm$. The ratio of radii of the tubes will be</span>
Question 42 :
A large cylindrical vessel contains water to a height of $10m$. It is found that the thrust acting on the curved surface is equal to that at the bottom. if atmospheric pressure can support a water column of $10m,$ the radius of the vessel is :
Question 43 :
Two capillaries of same length and radii in the ratio 1: 2 are.connected in series. A liquid flows through them in streamlined condition. If the pressure across the two extreme ends of the combination is 1 m of water, the pressure difference across first capillary is
Question 45 :
Assertion: In liquid retaining structures with fixed or floating covers the gas pressurevdeveloped above liquid surface shall be added to the liquid pressure.
Reason: In plane walls, the liquid pressure is resisted by both vertical and horizontal bending moments.
Question 46 :
What is the mass of $2$ litres of nitrogen at $22.4$ atmospheric pressure and $273\ K$
Question 47 :
<span>The pressure exerted by solids is a little different from that of fluids as in the case of solids, due to </span>
Question 48 :
A capillary tube is dipped in water vertically.Water rises to a height of 10mm. The tube is now tilted and makes an angle 60$^{o}$ with vertical.Now water rises to a height of:
Question 50 :
Calculate the water pressure and the thrust at the bottom of a tank whose length, width and the depth are $2\;m,1.5\;m\;and\;1\;m$ respectively. Density of water is $1000\;kg\;m^{-3}$.
