MCQ
Two droplets merge with each other and forms a large droplet. In this process
- ✓Energy is liberated
- BEnergy is absorbed
- CNeither liberated nor absorbed
- DSome mass is converted into energy
✓
Answer
Correct option: A.
Energy is liberated
a
(a) When two droplets merge with each other, their surface energy decreases.
(a) When two droplets merge with each other, their surface energy decreases.
$W = T(\Delta A) = ({\rm{negative}})$ i.e. energy is released.
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
The ratio of period of oscillation of the conical pendulum to that of the simple pendulum is : (Assume the strings are of the same length in the two cases and $\theta$ is the angle made by the string with the verticla in case of conical pendulum)
→A monoatomic gas is taken along path $AB$ as shown. Calculate change in internal energy of system
→Which one of the following statements is correct?
A pendulum bob has a speed of $3\, {m} / {s}$ at its lowest position. The pendulum is $50 \,{cm}$ long. The speed of bob, when the length makes an angle of $60^{\circ}$ to the vertical will be $ .......\,{m} / {s}$ $\left(g=10 \,{m} / {s}^{2}\right)$
→A cylinder of radius $4\ cm$ and height $10\ cm$ is immersed in two liquids as shown. Specific gravity of oil is $0.5$ . $2\ cm$ of cylinder is in the air. Select the $INCORRECT$ statement. Neglect atmospheric pressure.
→Two waves are simultaneously passing through a string and their equations are :
→${y}_{1}={A}_{1} \sin {k}({x}-v {t}), {y}_{2}={A}_{2} \sin {k}\left({x}-{vt}+{x}_{0}\right) .$ Given amplitudes ${A}_{1}=12\, {mm}$ and ${A}_{2}=5\, {mm}$ ${x}_{0}=3.5\, {cm}$ and wave number ${k}=6.28\, {cm}^{-1}$. The amplitude of resulting wave will be $......\,{mm}$
An organ pipe $P_1$, closed at one end vibrating in its first harmonic and another pipe $P_2$, open at both ends vibrating in its third harmonic, are in resonance with a given tuning fork, The ratio of the lengths of $P_1$ and $P_2$ is
→Consider the following two statements:
- Kirchhoff's junction law follows from conservation of charge.
- Kirchhoff's loop law follows from conservative nature of electric field.
- Both A and B are correct.
- A is correct but B is wrong.
- B is correct but A is wrong.
- Both A and B are wrong.
In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules gives out $20 J$ of heat and $10 J$ of work is done on the gas. If the initial internal energy of the gas was $40 J,$ then the final internal energy will be ........ $J$
→A screw gauge gives the following reading when used to measure the diameter of a wire.
→Main scale reading : $0\ mm$
Circular scale reading : $52\ divisions$
Given that $1\ mm$ on main scale corresponds to $100$ divisions of the circular scale. The diameter of wire from the above data is: