MHT CET · Physics · Mechanical Properties of Fluids
A rectangular film of liquid is expanded from ( \(5 \mathrm{~cm} \times 4 \mathrm{~cm}\) ) to ( \(7 \mathrm{~cm} \times 8 \mathrm{~cm}\) ). If the work done is \(3 \times 10^{-4} \mathrm{~J}\), the surface tension of the liquid is (nearly)
- A \(0.4 \mathrm{~N} / \mathrm{m}\)
- B \(0.04 \mathrm{~N} / \mathrm{m}\)
- C 0.4 dyne/cm
- D \(4 \cdot 0 \mathrm{~N} / \mathrm{m}\)
Answer & Solution
Correct Answer
(B) \(0.04 \mathrm{~N} / \mathrm{m}\)
Step-by-step Solution
Detailed explanation
\(A_1 = 5 \mathrm{~cm} \times 4 \mathrm{~cm} = 20 \mathrm{~cm}^2 = 20 \times 10^{-4} \mathrm{~m}^2\) \(A_2 = 7 \mathrm{~cm} \times 8 \mathrm{~cm} = 56 \mathrm{~cm}^2 = 56 \times 10^{-4} \mathrm{~m}^2\)
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
- The side of a copper cube is \(1 \mathrm{~m}\) at \(0^{\circ} \mathrm{C}\). What will be the change in its volume, when it is heated to \(100^{\circ} \mathrm{C}\) ? \(\left[\alpha_{\text {copper }}=18 \times 10^{-6} /{ }^{\circ} \mathrm{C}\right]\)MHT CET 2023 Medium
- Two identical long parallel wires carry currents \(I_1\) and \(I_2\) such that \(I_1>I_2\). When the currents are in the same direction, the magnetic field at a point midway between the wires is \(6 \times 10^{-6} \mathrm{~T}\). If the direction of \(I_2\) is reversed, the field becomes \(3 \times 10^{-5} \mathrm{~T}\). The ratio \(\left(\frac{I_1}{I_2}\right)\) is-MHT CET 2022 Hard
- A body of mass ' \(\mathrm{m}\) ' \(\mathrm{kg}\) starts falling from a distance 3R above earth's surface. When it reaches a distance ' \(R\) ' above the surface of the earth of radius ' \(R\) ' and Mass ' \(M\) ', then its kinetic energy isMHT CET 2023 Medium
- When a current in the conducting coil is changed from 5 A in one direction to 5 A in opposite direction in 0.5 second, an average induced e.m.f in the coil is 2 V . The self-inductance of the coil isMHT CET 2025 Easy
- A metal ball released from height 'h' makes perfectly elastic collision with ground. The frequency of periodic vibratory motion is \(\quad(\mathrm{g}=\) acceleration due to gravity \()\)MHT CET 2020 Medium
- Three inductances are connected as shown in figure. The equivalent inductance is
MHT CET 2024 Easy
More PYQs from MHT CET
- Identify the defect that develops when the ratio of number of cations to anions become different from that indicated by its chemical formula.MHT CET 2025 Easy
- Air capacitor has capacitance of \(1 \mu \mathrm{~F}\). Now the space between two plates of capacitor is filled with two dielectrics as shown in figure. The capacitance of the capacitor is ( \(\mathrm{d}=\) distance between two plates, \(\mathrm{K}_1\) and \(\mathrm{K}_2\) are dielectric constants of two dielectrics respectively)
MHT CET 2025 Easy - How many moles of dioxygen are present in \(8.314 \times 10^{-3} \mathrm{~m}^3\) of it at 318 K having pressure \(3.18 \times 10^5 \mathrm{Nm}^{-2} ?\left(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right)\)MHT CET 2024 Easy
- What is the molar mass of product hydrocarbon when 2 moles of methyl bromide reacts with large excess of sodium in dry ether?MHT CET 2024 Hard
- The maximum value of \(\mathrm{Z}=10 x+25 y\) subject to \(0 \leq x \leq 3,0 \leq y \leq 3\),
\(x+y \leq 5, x \geq 0, y \geq 0\) isMHT CET 2020 Easy - \(\int 7^{7^{7^{x}}} 7^{7^{x}} 7^{x} \mathrm{~d} x=\)MHT CET 2020 Hard