Home
Experiments
Contact
Feedback
Self Analysis
IIT Kanpur
PREVIOUS Attempt:
-/10
CURRENT Attempt:
-/10
What is the condition of wetting in the figure
Hydrophilic
Neutral
Hydrophobic
Superhydrophobic
From the Young's Equation below (and schematic shown below), deduce the what is θc terms:
Coverage fraction
Ratio of hydrophobic to hydrophilic component
Contact Angle
Circumference of contact
The amount of water controlled while dropping it on a substrate using:
Beaker
Test-tube
Dropper
Syringe
The sample stage should be __________ for measuring the contact angle:
Kept vertical
Kept inclined at 45
0
Kept horizontal
Kept inverted
Contact angle is measured by capturing the image of droplet on the substrate using:
The roughness of the substrate
The height of the droplet
The circumference of the droplet
The shape of the droplet
In superhydrophobic surface, the water bead on the substrate will:
Spread completely
Spread partially
Bead-up
Highly bead-up
Wetting can be quantified using contact angle " _____________":
Diffractometer
Goniometer
Spectrometer
Pyrometer
When a liquid has a very high surface energy, it will tend to be:
Superhydrophobic
Neutral
Hydrophobic
Hydrophilic
Which of the following can not affect the contact angle:
Chemistry of the material
Roughness of the material
Density of the Material
Surface Energy of the material
Assuming that ultra high molecular weight polyethylene (UHMWPE) has neutral contact angle, then addition of carbon nanotubes (with lower surface energy) in UHMWPE matrix will tend to:
Recover the lower surface energy
Increase the contact angle
Retain the same contact angle
Decrease the contact angle
Evaluate
Reset
Creep
Nano Indentation
Wetting
Fluorescence Micropscopy
Ionic Conductivity
People Involved
