List of top Physics Questions on Viscosity

The terminal velocity of a steel ball of radius r and density \(\rho\) falling through an oil column of density \(\sigma\) and viscosity \(\eta\) is

પ્રવાહીઓની વિસ્કોસિટી માપવા માટે ટર્મિનલ વેગ પ્રયોગમાં, સમાન ત્રિજ્યાવાળા પરંતુ વિવિધ ઘનતાવાળા ગોળાકાર બોલનો ઉપયોગ કરવામાં આવે છે. ટર્મિનલ વેગ (\( v \)) અને ગોળાકાર બોલની ઘનતા (\( \sigma \))ના પ્રવાહીની ઘનતા (\( \rho \)) સાથેના ગુણોત્તર સાથેનો વ્યવહાર શ્રેષ્ઠ રીતે દર્શાવે છે:

If the rate of flow of water from a pipe of radius 10 mm is $4.6\pi\times10^{-6}m^{3}s^{-1}$, then the Reynolds number of the flow is (Coefficient of viscosity of water $=10^{-3}Pas$)}

शीर्षित ढंग प्रयोग का उपयोग करके बोल्ट्ज़मैन स्थिरांक \(k\) का मान ज्ञात करने के लिए, समान त्रिज्या वाले गोलाकार बॉल्स का उपयोग किया जाता है। गोलाकार गेंद के घनत्व \((\sigma)\) और द्रव के घनत्व \((\rho)\) के अनुपात के साथ सीमांत वेग \((v)\) के परिवर्तन का सबसे उपयुक्त ग्राफ निम्नलिखित में से कौन-सा है?

In the measurement of viscosity of liquids using terminal velocity experiment, spherical balls of same radius but having different densities are used. The variation of the terminal velocity (\(v\)) with the ratio of density of spherical ball (\(\sigma\)) to density of the liquid (\(\rho\)), is best represented by:

In a tube, a liquid is flowing as shown in the diagram. The correct order of the velocity (u) of liquid flowing in this tube is: figure [H]

figure

Two drops of same radius are falling through air with steady velocity of $5~cms^{-1}$. If the two drops coalesce, the terminal velocity would be:

The terminal velocity v of a small spherical ball of radius r falling through a viscous liquid is directly proportional to:

Terminal velocity of a small sphere falling in viscous liquid varies with radius as:

If an air bubble of diameter 2 mm rises steadily through a liquid of density 2000 kg/m³ at a rate of 0.5 cm/s, then the coefficient of viscosity of the liquid is _______ Poise.

A sphere of mass $M$ and radius $R$ falls through a glycerin column and attains a terminal velocity $v_1$. Another sphere of same material but radius $3R$ falls through it. Its terminal velocity $v_2$ is:

A liquid rises to a height of $4 \text{ cm}$ in a capillary tube of radius $r$. If another capillary tube of radius $r/2$ is dipped in the same liquid, the height of liquid rise will be}

The rate of flow of a liquid through a capillary tube of radius $r$ and length $l$ under a pressure difference $P$ is proportional to

Eight identical spherical liquid drops, each falling with a terminal velocity \(v\), coalesce to form a single large drop. The terminal velocity of the new large drop is:

Eight identical spherical liquid drops, each falling with a terminal velocity $v$, coalesce to form a single large drop. The terminal velocity of the new large drop is:

Which one of the following graphs represents the velocity-time (v - t) graph of a small spherical body falling in a viscous liquid?

If a vector \( \vec{v} = 3\hat{i} \) is rotated in the \( x - z \) plane by an angle \( \theta \) with respect to \( x \)-axis in the clockwise direction, then for an observer at \( +y \) axis the vector will be

If the average terminal velocity of rain drop is 2 ms\(^{-1}\), then the energy transferred by rain to each square meter of the surface at a place which receives 100 cm of rain in a year is

Eight identical spherical liquid drops, each falling with a terminal velocity v, coalesce to form a single large drop. The terminal velocity of the new large drop is

For which of the following Reynold's number, a flow is streamlined?

The unit of coefficient of viscosity is:

Two capillary tubes of radii in the ratio $1:2$ are dipped in the same liquid. The ratio of heights through which the liquid will rise in the tubes is

The relative viscosity of blood $\left(\frac{\eta}{\eta_{water}}\right)$ is constant between

125 small water drops of same size fall through air with constant velocity 4 cm/s. They coalesce to form a big drop. The terminal velocity of the big drop is ______.

'$n$' small water drops of same size (radius $r$) fall through air with constant velocity V. They coalesce to form a big drop of radius R. The terminal velocity of the big drop is