MCQ
When ${10^6}$small drops coalesce to make a new larger drop then the drop
  • A
    Density increases
  • B
    Density decreases
  • Temperature increases
  • D
    Temperature decreases

Answer

Correct option: C.
Temperature increases
c
(c)Because energy is liberated

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The bob of a simple pendulum (mass m and length $ l$) dropped from a horizontal position strikes a block of the same mass elastically placed on a horizontal frictionless table. The K.E. of the block will be
A bar of mass $m$ , length $d$ and resistance $R$ slides without friction in a horizontal plane, moving on parallel rails as shown in figure. A battery that maintains a constant emf $\varepsilon $ is connected between the rails, and a constant magnetic field $\vec B$ is directed perpendicularly to the plane of the page. Assuming the bar starts from rest, Find speed at time $t$
Input waveforms $A$ and $B$ as shown in fig $I$ are applied to the combination of gates as shown in Fig.$II$. Which of the waveforms shown in Fig. $(i)$ to $(iv)$ correctly represents the output waveform?
A radioactive nucleus ${ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X}$ undergoes spontaneous decay in the sequence

${ }_{\mathrm{Z}}^{\mathrm{A}} \mathrm{X} \rightarrow {}_{\mathrm{Z}-1}{\mathrm{B}} \rightarrow {}_{\mathrm{Z}-3 }\mathrm{C} \rightarrow {}_{\mathrm{Z}-2} \mathrm{D}$, where $\mathrm{Z}$ is the atomic number of element $X.$ The possible decay particles in the sequence are :

$300\, J$ of work is done in sliding a $2\, kg$ block up an inclined plane of height $10\, m.$ Work done against friction is.....$J$ (Take $g = 10 m/s^2)$
If $150 J$ of heat is added to a system and the work done by the system is $110 J$, then change in internal energy will be .......... $J$
The weight of sphere in air is $50\ g$. Its weight $40\  g$ in a liquid, at temperature $20\,^o C$. When  temperature increases to $70\,^o C$ , it weight becomes $45\  g$, then the ratio of densities of liquid at given two temperature is
An electron in the $n = 1$ orbit of hydrogen atom is bound by $13.6 \,eV.$ If a hydrogen atom is in the $n = 3$ state, how much energy is required to ionize it.....$eV$
Plate resistance of two triode valves is $2 \,K$$\Omega$ and $ 4 \,K$$\Omega$, amplification factor of each of the valves is $40$. The ratio of voltage amplification, when used with $4 \,K$$\Omega$load resistance, will be
If resistance of voltmeter is $10000 \,\Omega$ and resistance of ammeter is $2 \,\Omega$ then find $R$ when voltmeter reads $12\,V$ and ammeter reads $0.1\, A$ ...............  $\Omega$