MCQ
The surface tension of a liquid at its boiling point:
- ABecomes zero.
- BBecomes infinity.
- CIs equal to the value at room temperature.
- DIs half to the value at the room temperature.
✓
Answer
- Becomes zero.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
If we can throw a ball upto a maximum height $H$, the maximum horizontal distance to which we can throw it is
→Time taken to heat water upto a temperature of 40°C (from room temperature) is t1 and time taken to heat mustard oil (of same mass and at room temperature) upto a temperature of 40°C is t2, then (given mustard oil has smaller heat capacity).
The motion of a particle varies with time according to the relation $y = a(\sin \omega \,t + \cos \omega \,t)$, then
→A small disk can slide in a circular path on a frictionless inclined plane inclined at an angle of $30^o $ with the help of a thread as shown. Mass of the disk is $m$ and acceleration due to gravity is $g$. If the disk is released, when the thread is horizontal, expression for the tension in the thread at the lowest point is :- ................. $\mathrm{mg}$
→A spaceship orbits around a planet at a height of $20\,km$ from its surface. Assuming that only gravitational field of the plant acts on the spaceship. What will be the number of complete revolutions made by the spaceship in $24\,hours$ around the plane? [Given: Mass of plane $= 8 \times 10^{22}\,kg,$ Radius of planet $= 2\times 10^6\,m,$ Gravitational constant $G = 6.67\times 10^{-11}\,Mn^2/kg^2$ ]
→An ideal gas is expanded adiabatically at an initial temperature of $300 K$ so that its volume is doubled. The final temperature of the hydrogen gas is $(\gamma = 1.40)$
→A solid sphere of mass $500\ gm$ and radius $10\ cm$ rolls without slipping with the velocity $20\ cm/s$. The total kinetic energy of the sphere will be ........ $J$
→A body moves from rest with a constant acceleration. Which one of the following graphs represents the variation of its kinetic energy $K$ with the distance travelled $x $ ?
→A small steel ball of radius $r$ is allowed to fall under gravity through a column of a viscous liquid of coefficient of viscosity $\eta $. After some time the velocity of the ball attains a constant value known as terminal velocity ${v_T}$. The terminal velocity depends on $(i)$ the mass of the ball $m$, $(ii)$ $\eta $, $(iii)$ $r$ and $(iv)$ acceleration due to gravity $g$. Which of the following relations is dimensionally correct
→Three blocks $A$, $B$ and $C$ are pulled on a horizontal smooth surface by a force of $80 \mathrm{~N}$ as shown in figure
→The tensions $T_1$ and $T_2$ in the string are respectively