Question 1 :
Lifting automobiles in service stations is based on the principle of ________.

Question 2 :
A solid rubber ball of density 'd' and radius 'R' falls vertically through air. Assume that the air resistance acting on the ball is F $=$ KRV where K is constant and V is its velocity. Because of this air resistance the ball attains a constant velocity called terminal velocity $V_{T}$ after some time.Then $V_{T}$ is:

Question 3 :
The excess pressure inside a spherical soap bubble of radius $1\ cm$ is balanced by a column of oil (specific gravity $= 0.8), 2\ mm$ high, the surface tension of the bubble is :

Question 4 :
If the meniscus of a liquid is concave in shape, then

Question 5 :
Eight drops of equal size are falling through air with steady velocity of 10 cm/sec. If the drops coalesce, what could be its terminal velocity?

Question 6 :
................ works on the Pascal's law and is used in automobiles.

Question 8 :
n identical droplets are charged to V volt each. If they coalesce to form a single drop, then its potential will be

Question 9 :
To stop a heavy vehicle moving with high velocity, a device working on Pascal's law is used, That device is

Question 11 :
Small droplets of a liquid are generally more spherical&#160;in shape than large drops of the same liquid because&#160; :&#160; &#160; &#160; &#160; &#160; &#160;&#160; <br/>

Question 12 :
If the atmospheric pressure is 76 cm of Hg at what depth of water in a lake the pressure will becomes 2 atmospheres nearly.

Question 13 :
When a solid ball of volume V is falling through a viscous liquid, a viscous force F acts on it. If another ball of volume 2V of the same material is falling through the same liquid then the viscous force experienced by it will be (when both fall with terminal velocities).

Question 14 :
The excess pressure in soap bubble is&#160;10N / m$^{2}$. If eight soap bubbles are combined&#160;to form a big soap bubble, then the excess pressure in&#160;big bubble is :

Question 15 :
The terminal velocity of a&#160;rain drop is $30 cm/s$, If the viscosity of air is $1.8 \times10^{-5} Nsm^{-2}$, The radius of rain drop is:

Question 16 :
<p>STATEMENT-1 : At two different points on the same stream line in streamline flow, velocity of a particle may be different.<br>STATEMENT-2 : Pressure and height may be different at two different points on a streamline.</p>

Question 17 :
A person in a lift is holding a water jar, which has a small hole at the lower end of its side. When the lift is at rest, the water jet coming out of the hole hits the floor of the lift at a distance $d$ of $1.2 m$ from the person. In the following, state of the lift's motion is given in List I and the distance where the water jet hits the floor of the lift is given in List II. Match the statements from List I with those in List II and select the correct answer using the code given below the lists.<br/><table class="wysiwyg-table"><tbody><tr><td></td><td>List I</td><td></td><td>List II</td></tr><tr><td>P.</td><td>Lift is accelerating vertically up.</td><td>1.</td><td>$d= 1.2 m$</td></tr><tr><td>Q.</td><td>Lift is accelerating vertically down with an acceleration less than the gravitational acceleration.</td><td>2.</td><td>$d &gt; 1.2 m$</td></tr><tr><td>R.</td><td>Lift is moving vertically up with constant speed.</td><td>3.</td><td>$d &lt; 1.2 m$</td></tr><tr><td>S.</td><td>Lift is falling freely.</td><td>4.</td><td>No water leaks out of the jar</td></tr></tbody></table>

Question 18 :
In which one of the following cases will the liquid flow in a pipe be most streamlined

Question 19 :
A solid sphere falls with a terminal velocity of 10 m/s in air. If it is allowed to fall in vacuum:<br/>

Question 20 :
The angle of contact at the interface of water glass is ${0^ \circ }$, Ethyl-alcohol glass is ${0^ \circ }$ Mercury glass is ${140^ \circ }$ and Methyl iodide is ${30^ \circ }$. A glass capillary is put in a trough containing one of these for liquids it is observed that the meniscus is convex. the liquid in the trough is :&#160; &#160; &#160;&#160;