If W be the weight of a body of density in vacuum then its appare… - Vidyadip

MCQ

If $W$ be the weight of a body of density $\rho $ in vacuum then its apparent weight in air of density $\sigma $ is

A
$\frac{{W\rho }}{\sigma }$
B
$W\,\left( {\frac{\rho }{\sigma } - 1} \right)$
C
$\frac{W}{\rho }\sigma $
✓
$W\,\left( {1 - \frac{\sigma }{\rho }} \right)$

✓

Answer

Correct option: D.

$W\,\left( {1 - \frac{\sigma }{\rho }} \right)$

d
(d) Apparent weight in air $= W -$ upthrust = $V\rho g - V\sigma g$

=$V\rho g\left( {1 - \frac{\sigma }{\rho }} \right)$= $W\left( {1 - \frac{\sigma }{\rho }} \right)$

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

Explore more

More "M.C.Q (1 Marks)" from 9.1 , fluid mechanics→9.1 , fluid mechanics — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The relation between phase difference $ (\Delta \phi) $ and path difference $ (\Delta x) $ is

A particle is thrown with a speed $u$ at an angle $\theta$ with the horizontal. When the particle makes an angle $\phi$ with the horizontal, its speed changes to $v$, where

A particle of mass $m = 5$ is moving with a uniform speed $v = 3\sqrt 2$ in the $XOY$ plane along the line $Y = X + 4$ . The magnitude of the angular momentum of the particle about the origin is .......

In problem $7.5,$ the $CM$ of the plate is now in the following quadrant of $x - y$ plane:

In isothermal process, the work done per gram molecule of gas is:

Particles $A$ and $B$ are moving with constant velocities along $x$ and $y$ axis respectively, the graph of separation between them with time is

Consider a gas enclosed in a box. A molecule of mass $m,$ having a velocity $-2i +3j +4k$ collides with a wall parallel to the $xz$ plane. What will be its velocity after collision and its change in momentum$?\ i, j\ \&\ k$ are unit vectors along the $x, y\ \&\ z$ axis.

A body oscillates with a simple harmonic motion having amplitude $0.05\, m .$ At a certain instant, its displacement is $0.01\, m$ and acceleration is $1.0 \,m / s ^{2} .$ The period of oscillation is

In the picture shown, a ball standing from rest rolls down a ramp $AB$, goes along at the horizontal bottom $BC$, and then backs up a smaller ramp $CD$, thereafter rolls on horizontal plane $DE$. Ignore friction and air resistance.Which of the following figure shows variation in speed with time ?

The angular velocity of a particle rotating in a circular orbit $100$ times per minute is