COMEDK · Physics · 11. Mechanical Properties of Fluids
A block of wood floats in water with \((4 / 5)\) th of its volume submerged. If the same block just floats in a liquid, the density of the liquid is \(\left(\right.\) in \(\mathrm{kgm}^{-3}\) )
- A 1250
- B 600
- C 400
- D 800
Answer & Solution
Correct Answer
(D) 800
Step-by-step Solution
Detailed explanation
Applying Archimedes' principle, submerged part \(=\) replaced water \(\Rightarrow \quad \frac{4}{5} h \rho_{u s} g=h \times \rho_l \times g\) where, \(\rho_w=\) density of water and \(\rho_l=\) density of the liquid.…
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
- A bullet of 0.02 kg moving with a speed of \(100 \mathrm{~ms}^{-1}\) hits a surface and comes to rest in 0.1 s What is the magnitude of the impulse of the force?COMEDK 2025 Easy
- A cubical box of side \(1 \mathrm{~m}\) contains Boron gas at a pressure of \(100 \mathrm{~Nm}^{-2}\). During an observation time of 1 second, an atom travelling with the rms speed parallel to one of the edges of the cube, was found to make 500 hits with a particular wall, without any collision with other atoms. The total mass of gas in the box in gram isCOMEDK 2024 Medium
- A plane electromagnetic wave of frequency \(20 \mathrm{~MHz}\) travels through a space along \(x\)-direction. If the electric field vector at a certain point in space is \(6 \mathrm{~Vm}^{-1}\), then what is the magnetic field vector at that point?COMEDK 2023 Easy
- A stone of mass \(2 \mathrm{~kg}\) is hung from the ceiling of the room using two strings. If the strings make an angle \(60^{\circ}\) and \(30^{\circ}\) respectively with the horizontal surface of the roof then the tension on the longer string is : \(g=10 \mathrm{~ms}^{-2}\)COMEDK 2024 Medium
- A bar magnet is suspended in a uniform magnetic field of field strength 0.36 T . If the magnetic moment of the bar magnet is \(4 \mathrm{Am}^2\) then the work done in rotating the magnet from its most stable position to its most unstable position is:COMEDK 2025 Medium
- The percentage increase in magnetic field \(\mathrm{B}\) when the space within a current carrying solenoid is filled with a medium of susceptibility 0.004 isCOMEDK 2024 Easy
More PYQs from COMEDK
- If two pairs of lines \(x^{2}-2 m x y-y^{2}=0\) and \(x^{2}-2 n x y-y^{2}=0\) are such that one of them represents the bisector of the angles between the other, thenCOMEDK 2021 Medium
- Ozone is formed by the reaction
\(\text{O}_{2(g)} + \text{O}_{(g)} \rightarrow \text{O}_{3(g)},\ \Delta H = -107.2\ kJ\).
Given O=O bond energy is 498.0 kJ \(\text{mol}^{-1}\), the average bond energy of ozone is:COMEDK 2026 Medium - In the redox reaction, taking place in acidic medium:
\(\text{X}\ \text{MnO}_4^-\ (aq) + \text{Y}\ \text{SO}_2(g) \rightarrow \text{Mn}^{+2}(aq) + \text{HSO}_4^-\ (aq)\),
the ratio of X:Y in a stoichiometrically balanced equation will beCOMEDK 2026 Medium - A 150 watt bulb emits light of wavelength \(6600 Å\) and only \(8 \%\) of the energy is emitted as light. How many photons are emitted by the bulb per second?COMEDK 2014 Hard
- Which of the following is not true?COMEDK 2023 Medium
- If a polygon of \(n\) sides has 275 diagonals, then \(n\) is equal toCOMEDK 2021 Easy