Which of the following statements is FALSE ?

Question

BlackTom AI · Accepted Answer

Let's evaluate each statement carefully to determine which are true and which is false.
Option 1: 'A pressure that is below atmospheric pressure is known as a vacuum' This is generally accurate because vacuum refers to a condition where pressure is less than the ambient atmospheric pressure, often approaching zero absolute pressure in practical terms. So this statement is true.
Option 2: 'A barometer is used to measure atmospheric pressure' This is correct. A barometer is specifically designed to measure atmospheric pressure, typically providing a reading of ambient pressure in the environment. Therefore, this statement is true.
Option 3: 'In Newtonian fluid, the shear stress is proportional to the velocity gradient' This describes Newton's law of viscosity, tau = mu * (du/dy), which is the defining relationship for Newtonian fluids. Hence, this statement is true.
Option 4: 'A bourdon tube pressure gage is used to measure absolute pressure' This is the tricky one. A Bourdon tube gauge is a mechanical pressure gauge that measures gauge pressure, i.e., the pressure relative to ambient atmospheric pressure, not absolute pressure. Absolute pressure requires a sealed reference (often with a vacuum or another reference) to account for atmospheric pressure. Therefore, this statement is false.
Thus, among the options, the only incorrect (false) statement is the fourth one, while the first three are true.

July 2025: FT DMET 225 FT DMET 325 - Mechanical Science CW01-Quiz 1 July 2025: FT DMET 225 FT DMET 325 - Mechanical Science CW01-Quiz 1

Which of the following statements is FALSE ?

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