Question:
Which one of the following is not a Newtonian fluid?
Which one of the following is not a Newtonian fluid?
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If a substance changes its flow behavior under pressure or stress (like ketchup or toothpaste), it's likely non-Newtonian.
Updated On: Jun 25, 2025
- Water
- Toothpaste
- Glycerol
- Alcohol
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The Correct Option is B
Solution and Explanation
Newtonian fluids are those whose viscosity remains constant regardless of the applied shear rate. Water, glycerol, and alcohol are classic examples of Newtonian fluids.
Toothpaste, on the other hand, is a non-Newtonian fluid. Its viscosity decreases under shear stress — a behavior known as shear-thinning. That’s why it flows easily when squeezed out of a tube but stays firm otherwise.
This behavior is characteristic of non-Newtonian fluids, which do not follow Newton's law of viscosity. Hence, toothpaste is not a Newtonian fluid.
Toothpaste, on the other hand, is a non-Newtonian fluid. Its viscosity decreases under shear stress — a behavior known as shear-thinning. That’s why it flows easily when squeezed out of a tube but stays firm otherwise.
This behavior is characteristic of non-Newtonian fluids, which do not follow Newton's law of viscosity. Hence, toothpaste is not a Newtonian fluid.
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