Assertion : A large force is required to draw apart normally two … - Vidyadip

MCQ

$Assertion :$ A large force is required to draw apart normally two glass plates enclosing a thin water film.
$Reason :$ Water works as glue and sticks two glass plates.

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
✓
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

✓

Answer

Correct option: C.

If the Assertion is correct but Reason is incorrect.

c
In this case, atmospheric pressure does not comes into it because it acts in all direction. The force which is effective in case of water between two pieces of glass is adhesive force. As, adhesive forces are considered that between two different bodies; cohesive forces are internal forces of a body, resulting from attraction between the molecules of it. The attractive force between water and glass (the glass contain silicium atoms, negatively charged and water is a polar molecule so that the positive side of water is attached and causes part of the bound) keep them firmly tovether. Due to the big surface of the glass slide, the resultant force is also big. So we have to apply a large force in order to separate two glass plates enclosed with water film.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 9.2 , surface tension→9.2 , surface tension — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

An open pipe of length $l$ vibrates in fundamental mode. The pressure variation is maximum at

A body moving with uniform acceleration has a velocity of $12.0 cm / s$ in the positive x -direction when its x coordinate is 3.00 cm. If its $x$ coordinate 2.00 seconds later is -5.00 cm , what is the magnitude of its acceleration in $cm / s ^2$ ?

→

Which of the following are obtained by dividing total displacement by total time taken?

The type of waves that can be propagated through solid is

As per the given figure, two blocks each of mass $250\,g$ are connected to a spring of spring constant $2\,Nm ^{-1}$. If both are given velocity $V$ in opposite directions, then maximum elongation of the spring is:

Assertion $(A):$ If there is not external torque on a body about its centre of mass, then the velocity of the centre of mass remains constant.

Reason $(R):$ The linear momentum of an isolated system remains constant.

If force $F$ , velocity $V$ and time $T$ are taken as fundamental units then dimension of force in the pressure is

A cubical box of side $a$ sitting on a rough table-top is pushed horizontally with a gradually increasing force until the box moves. If the force is applied at a height from the table top which is greater than a critical height $H$, the box topples first. If it is applied at a height less than $H$, the box starts sliding first. Then, the coefficient of friction between the box and the table top is

During an adiabatic expansion of $2\, moles$ of a gas, the change in internal energy was found $-50J.$ The work done during the process is ...... $J$

A ball is dropped from a height of $49\,m$. The wind is blowing horizontally. Due to wind a constant horizontal acceleration is provided to the ball. Choose the correct statement (s). (Take $g=9.8\,m / s ^2$ )