Download App

Mechanical Properties of Fluids — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsMechanical Properties of Fluids2 Marks
Question
Explain why
Water on a clean glass surface tends to spread out while mercury on the same surface tends to form drops. (Put differently, water wets glass while mercury does not.)
✓

Answer

Mercury molecules (which make an obtuse angle with glass) have a strong force of attraction between themselves and a weak force of attraction toward solids. Hence, they tend to form drops.
On the other hand, water molecules make acute angles with glass. They have a weak force of attraction between themselves and a strong force of attraction toward solids. Hence, they tend to spread out.

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 "2 Marks Questions" from Mechanical Properties of Fluids→Mechanical Properties of Fluids — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

A photographic film is coated with a silver bromide layer. When light fells on this film, silver bromide molecules dissociate end the film records the light there. A minimum of 0.6eV is needed to dissociate a silver bromide molecule. Find the maximum wavelength of light that can be recorded by the film.
→
Define temperature coefficient of the velocity of sound.
→
A body rotates about a fixed axis with an angular acceleration of one radian/ second/ second. Through what angle does it rotate during the time in which its angular velocity increases from 5rad/s to 15rad/s.
→
Define longitudinal wave motion. What are the essential conditions required for the formation of longitudinal wave motion?
→
Define two principle specific heats of a gas. Which is greater and why?
→
A 2 kg block is kept at rest on a flat surface. A horizontal force $F$ on the block is gradually increased. When the value of $F$ becomes 8 N the block starts moving. Once the motion starts, it starts moving at a uniform speed only with the help of 7N force. Find out :
(i) Static and dynamic friction coefficient.
(ii) When the value of $F$ is 5 N , then the static friction force acting on the block is.
(iii) When the value of $F$ is again 8 N the acceleration of moving block. ( $g = 9 . 8 ~ m / s ^2$ )
→
The weather report reads, "Temperature 20°C : Relative humidity 100%". What is the dew point?
→
Answer the following:
You are given a thread and a metre scale. How will you estimate the diameter of the thread?
→
Calculate the energy required to move a body of mass $m$ from an orbit of radius $2 R$ to $3 R$.
→
Which of the following functions of time represent (a) simple harmonic, (b) periodic but not simple harmonic, and (c) non-periodic motion? Give period for each case of periodic motion ($\omega$ is any positive constant):
$\sin\omega\text{t}-\cos\omega\text{t}$
→