Question

Which of the following is not a fluid?

• A. Mustard oil
• B. Oxygen
• C. Chalk
• D. Water

Answer 1

The correct option is C

Chalk

Explanation of correct option

1. Solids are substances having rigid shapes and sizes.
2. Whereas fluids don't have a particular shape, it takes the shape of the container it contains.
3. Fluids include both liquid and gas.
4. The chalk has a definite shape and size.
5. So it is solid.
6. Anything that can flow is fluid. Essentially, all liquids and gases are fluids.
7. Hence, mustard oil, oxygen and water are fluid.

Hence, option C is correct.