Q.1
A square wire frame of size L is dipped in a liquid. On taking out, a ,embrane is formed. If the surface tension of liquid is T, force acting on the entire frame will be
  • 2TL
  • 4TL
  • 8TL
  • 10TL
Q.2
The force required to seperate two glass plates of area 10-2m2 with a film of water 0.05mm thickness between them is (surface tension of water isx 10-3N/m)
  • 25N
  • 20N
  • 14N
  • 28N
Q.3
8 mercury drops coalesce to form 1 mercury drop, the energy changes by a factor of
  • 1
  • 2
  • 4
  • 6
Q.4
The force of attraction between the molecules of the same substance is called as
  • adhesive force
  • force of surface tension
  • cohesive force
  • electrostatic force
Q.5
The surface tension of liquid decreases with a rise in
  • viscosity of the liquid
  • temperature of the liquid
  • diameter of container
  • thickness of container
Q.6
The force between two charges depends upon
  • distance between charges
  • wavelength
  • frequency
  • amplitude
Q.7
Force depends on
  • mass
  • speed
  • length
  • angle
Q.8
The linear momentum depends upon
  • velocity
  • speed
  • areal velocity
  • none
Q.9
Wave is
  • nothing
  • disturbance in any medium
  • SHM
  • created by time
Q.10
Viscosity of fluid increases its speed will
  • increases
  • decreases
  • no change
Q.11
Surface tension is equalto
  • force/area
  • forcex are
  • force/length
Q.12
Surface tension is the phenomenon happens in
  • liquid
  • solid
  • gas
Q.13
The rise in the level of a liquid in a tube is h. If half the amount is poured outside, what will be the new rise in liquid level?
  • 0
  • h/2
  • h
  • 2h
Q.14
In which situation is work not being done?
  • a 26 Kg wagon being pulled
  • a 30 Kg present being held above the floor
  • a 60 Kg weight being lifted up off the ground
  • a 13 Kg cat running across the floor
Q.15
What is the excess pressure inside a soap bubble of radius r
  • $\frac{4T}{r}$
  • $\frac{2T}{r}$
  • $\frac{r}{4T}$
  • $\frac{r}{2T}$
Q.16
At critical temperature surface temperature is
  • more than 1
  • exactly 1
  • zero
  • infinity
Q.17
Work done in blowing a soap bubble of radius r is
  • $4\pi r^2T$
  • $8\pi r^2T$
  • $\frac{8\pi r^3T}{3}$
  • $\frac{4\pi r^3T}{3}$
Q.18
With the rise in temperature, surface tension
  • increases
  • decreases
  • remains the same
  • becomes zero
Q.19
The molecules existing at One of the following experience unbalanced forces
  • At the bottom and projecting to the glass bottom
  • At the walls and projecting to the glass
  • In the bulk and projecting inside
  • On the surface and projecting outwards
Q.20
When sugar is added to water,the surface tension changes as follows
  • Decreases
  • Increases
  • Not affected
  • Zero
0 h : 0 m : 1 s