MCQ
The surface energy of liquid film on a ring of area $0.15\;{m^2}$ is ....... $J$ (Surface tension of liquid $ = 5\,N{m^{ - 1}})$
- A$0.75$
- ✓$1.5 $
- C$2.25 $
- D$3.0$
✓
Answer
Correct option: B.
$1.5 $
b
(b) Surface energy = $T \times A = 5 \times 2 \times (0.15) = 1.5\,J$
(b) Surface energy = $T \times A = 5 \times 2 \times (0.15) = 1.5\,J$
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
Figure shows the orientation of two vectors $u$ and $v$ in the $XY$ plane.
If $\text{u}=\text{a}\hat{\text{i}}+\text{b}\hat{\text{j}}$ and $\text{v}=\text{p}\hat{\text{i}}+\text{q}\hat{\text{j}}$ which of the following is correct?
→If $\text{u}=\text{a}\hat{\text{i}}+\text{b}\hat{\text{j}}$ and $\text{v}=\text{p}\hat{\text{i}}+\text{q}\hat{\text{j}}$ which of the following is correct?
Three blocks $A, B$ and $C,$ of masses $4\, kg, \,2 \,kg$ and $1\, kg$ respectively, are in contact on a frictionless surface, as shown. If a force of $14\, N$ is applied on the $4 \,kg$ block, then the contact force between $A$ and $B$ is .......... $N$
→For hydrogen gas, $C_p-C_v=b$. The relation between $a$ and $b$ is:
→The string of pendulum of length $l$ is displaced through ${90^o}$ from the vertical and released. Then the minimum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is
→The figure shows a velocity-time graph of a particle moving along a straight line The correct displacement-time graph of the particle is shown as
Young's modulus of a material has the same units as
A balloon is rising vertically up with a velocity of $29 \,ms^{-1}$. A stone is dropped from it and it reaches the ground in $10$ seconds. The height of the balloon when the stone was dropped from it is...........$m$ ($g = 9.8\,m/{s^2}$)
→A block $A$ of mass $7 \,kg$ is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body $B$ of mass $3\, kg$ at the other end. The acceleration of the system is .......... $ms^{-2}$ (given g = 10$m{s^{ - 2}})$
→A particle of mass $m$ , attached with a string of length $l$ is moving in a vertical circle. If the particle is just looping the loop without slackening of the string and $v_A, v_B, v_D$ are speeds at positions $A, B, D$ shown in figure, then
→Two projectiles, one fired from surface of earth with velocity $10 \,m/s$ and other fired from the surface of another planet with initial speed $5\, m/s$ trace identical trajectories. The value of acceleration due to the gravity on the planet is ......... $m/s^2$
→