Tag: physics

Quizzes (598) Questions (13441)

Questions Related to physics

Multiple choice physics option b: engineering physics buoyancy floatation fluid pressure

The branch of physics which deals with the study of fluids at rest is called :

  1. statistics

  2. hydrostatics

  3. hydrodynamics

  4. thermometry
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The branch of physics which deals with the study of fluids at rest is called hydrostatics.

Hydro stands for liquids and statics is for the fluid at rest.

Multiple choice physics option b: engineering physics buoyancy floatation fluid pressure

KE per unit volume is E. The pressure exerted by the gas is given by:

  1. $\displaystyle \frac {E}{3}$
  2. $\displaystyle \frac {2E}{3}$
  3. $\displaystyle \frac {3E}{2}$
  4. $\displaystyle \frac {E}{2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pressure exerted by gas is given by $P=\dfrac{1}{3}\rho v^2$

where $v$ is the velocity of gas particles, $\rho $ is the density of gas.
Kinetic energy per unit volume$=E=\dfrac{\dfrac{1}{2}mv^2}{V}=\dfrac{1}{2}\rho v^2$
Thus $P=\dfrac{2}{3}(\dfrac{1}{2}\rho v^2)=\dfrac{2E}{3}$

Multiple choice physics option b: engineering physics buoyancy floatation fluid pressure

Water is floating smoothly through a closed-pipe system. At one point $A$, the speed of the water is $3.0\ m$ while at another point $B$, $1.0\ m$ higher, the speed is $4.0\ m/s$. The pressure at $A$ is $20\ kPa$ when the flowing $18\ kPa$ when the water flow stop. Then

  1. the pressure at $B$ when water is flowing is $6.5\ kPa$
  2. the pressure at $B$ when water is flowing is $8.0\ kPa$
  3. the pressure at $B$ when water is flowing is $10\ kPa$

  4. None of these
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Multiple choice physics option b: engineering physics buoyancy floatation fluid pressure

A cylindrical container is filled with water upto the brim. If the pressure exerted by the water at the bottom of the container is 1000 Pa the height of the container is ..........cm.(take $g = 10 m s^{-2}$)

  1. 10

  2. 100

  3. 1

  4. 20
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

pressure inside a fluid = $\rho gh$ , in this case $\rho$ = 1000 kg $  m^{3}$

so , 
1000 =  (1000)(10) (h)
hence h = 0.1 m = 10 cm
hence option (A) is correct

Multiple choice physics option b: engineering physics buoyancy floatation fluid pressure

A cylinder at a certain ternperature has a gas at a pressure ot $50cm$ of Hg.Then it is divided into three equal parts so that the gas in the central part is completely transferred to either equally. Find the pressure of the gas in each portion.

  1. $10cm$
  2. $20cm$
  3. $75cm$
  4. $100cm$
Reveal answer Fill a bubble to check yourself
B Correct answer
Multiple choice physics option b: engineering physics buoyancy floatation fluid pressure

The length of vacuum above mercury column in a barometer is $10cm/cc$ of air from outside where the pressure is $76cm$ of Hg is passed into the barometer tube. The area of cross section of the tube is $1{ cm }^{ 2 }$.The height of the mercury column then will be

  1. $71cm$
  2. $72cm$
  3. $73cm$
  4. $74cm$
Reveal answer Fill a bubble to check yourself
C Correct answer
Multiple choice physics option b: engineering physics buoyancy floatation fluid pressure

A beaker is filled with a liquid of density $\rho$ upto a height h. If the beaker is at rest , the mean pressure on the walls is 

  1. $0$
  2. $h \rho g$
  3. $\dfrac{h \rho g}{2}$
  4. $2 h \rho g$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pressure varies linearly with depth from 0 at the surface to rho*g*h at the bottom. The mean pressure is the average of these two values: (0 + rho*g*h) / 2 = (rho*g*h) / 2.