Hello Mrunali !
In natural convection, the fluid motion occurs by natural means such as buoyancy , the fluid motion is not generated by any external source (like a pump, fan, suction device, etc.)
So , your answer is option A.
You can check detailed information about this in the following PDF File,
https://www.sfu.ca/~mbahrami/ENSC%20388/Notes/Natural%20Convection.pdf
Hope it helps !
Question : Which of the following statements is not correct about surface tension?
Option 1: Surface tension is typically measured in dynes cm.
Option 2: The shape of the water drop is spherical due to surface tension.
Option 3: At room temperature, the surface tension of water is less than ethyl alcohol.
Option 4: The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.
Question : Venturi meters are used to measure:
Option 1: Rate of flow of liquids
Option 2: Liquid pressure
Option 3: Surface tension
Option 4: Liquid density
Question : If there was no gravity, which of the following would not be there in fluid?
Option 1: Viscosity
Option 2: Surface tension
Option 3: Pressure
Option 4: Upward thrust
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile