AP EAMCET · PHYSICS · Mechanical Properties of Fluids
One thousand small water drops of equal radii combine to form a big drop. The ratio of final surface energy to total initial surface energy is
- A \(1000: 1\)
- B \(1: 1000\)
- C \(10: 1\)
- D \(1: 10\)
Answer & Solution
Correct Answer
(D) \(1: 10\)
Step-by-step Solution
Detailed explanation
Let radius of big drop \(=R\) Radius of small drop \(=r\) Number of small drops, \(n=1000\) In this process, the volume remains same \(V_f=V_i\) \(\frac{4}{3} \pi R^3=n\left(\frac{4}{3} \pi r^3\right)\) \(R^3=1000 r^3 \Rightarrow R=10 r\) ...(i) Initial surface area,…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from PHYSICS
- Assertion (A): Two identical trains move in opposite senses in equatorial plane with same speeds relative to the earth's surface. They have equal magnitude of normal reaction.
Reason (R): The trains have different centripetal accelerations due to different speeds.AP EAMCET 2021 Medium - The electric field intensity (E) at a distance of 3 m from a uniform long straight wire of linear charge density 0.2 m \(\mathrm{Cm}^{-1}\) isAP EAMCET 2024 Easy
- Three point charges of \(3 \mu \mathrm{C}, 4 \mu \mathrm{C}\), and \(5 \mu \mathrm{C}\) are arranged at the three corners of a right angled triangle \(A B C\) as shown in the figure. The work done in moving the charges at \(A\) and \(C\), so that the three charges are located at the three corners of an equilateral triangle of side \(3 \mathrm{~cm}\) is
AP EAMCET 2019 Medium - A car takes a round turn of radius with a velocity of . The centripetal force acting on the car isAP EAMCET 2021 Easy
- Which statement(s) among the following are incorrect:
(i) A negative test charge experiences a force opposite to the direction of the field.
(ii) The tangent drawn to a line of force represents the direction of electric field.
(iii) The electric field lines never intersect.
(iv) The electric field lines form a closed loop.AP EAMCET 2021 Easy - The mass of a planet is half that of the earth and the radius of the planet is one-fourth that of earth. If we plan to send an artificial satellite from the planet, the escape velocity will be, (escape velocity on earth \(v_e=11 \mathrm{~km}-\mathrm{s}^{-1}\) )AP EAMCET 2007 Easy
More PYQs from AP EAMCET
- If \(A=\left[\begin{array}{cc}0 & -1 \\ 1 & 0\end{array}\right]\), then the incorrect option among the following isAP EAMCET 2018 Easy
- Some statements about Lechlanche cell are
(I) Anode is zinc metal
(II) Cathode is graphite rod surrounded by powdered \(\mathrm{MnO}_2\) and carbon
(III)Electrolyte is a moist paste of \(\mathrm{ZnO}\) and \(\mathrm{KOH}\)
(IV)Oxidation product is \(\mathrm{ZnO}\)
The correct statements areAP EAMCET 2023 Easy - Consider the reaction given below
\(\mathrm{A}+2 \mathrm{~B} \longrightarrow 3 \mathrm{C}+2 \mathrm{D}\).
If rate of disapperance of B is \(x \times 10^{-2} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\), the ratio of rate of reaction and rate of appearance of C isAP EAMCET 2025 Medium - In a given process, for an ideal gas, \(\Delta W=0\) and \(\Delta Q < 0\). Then, for the gas,AP EAMCET 2021 Easy
- The value of '' for which the equation represents a pair of straight lines, isAP EAMCET 2021 Easy
- A small electric heater is used to heat \(200 \mathrm{~g}\) of water. The time required to bring all this water from \(40^{\circ} \mathrm{C}\) to \(100^{\circ} \mathrm{C}\) is \(200 \mathrm{~s}\). If specific heat of the water is \(4200 \mathrm{~J} \mathrm{~kg}^{-1} \mathrm{~K}^{-1}\) then the power supplied by the heater isAP EAMCET 2022 Easy