Unit 11: Mechanical Properties of Fluids — Online MCQ Test
PHYSICS · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board
Practice Unit 11: Mechanical Properties of Fluids with a free chapter-wise online MCQ test.
This chapter covers: Focusing on fluid dynamics this chapter details pressure variation with depth Pascal law Archimedes principle viscosity Stokes law Reynolds number Bernoulli principle surface tensi....
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Unit 11: Mechanical Properties of Fluids — Important Questions & Answers
Which law states that pressure applied to an enclosed fluid is transmitted equally and undiminished in all directions?
- A. Archimedes' principle
- B. Pascal's law
- C. Bernoulli's principle
- D. Stokes' law
Answer: B. Pascal's law
Pascal's law describes the transmission of pressure in a confined fluid equally in all directions.
Pascal's law describes the transmission of pressure in a confined fluid equally in all directions.
The SI unit of coefficient of viscosity is:
- A. N m
- B. Pa s
- C. N/m
- D. J s
Answer: B. Pa s
The coefficient of viscosity is measured in pascal-second (Pa s) in SI units.
The coefficient of viscosity is measured in pascal-second (Pa s) in SI units.
Why does atmospheric pressure decrease as altitude increases?
- A. Air becomes denser at higher altitudes
- B. The weight of the air column above decreases
- C. Gravity becomes zero at high altitude
- D. Air pressure is independent of height
Answer: B. The weight of the air column above decreases
At higher altitudes, there is less air above, so the weight of the air column and hence pressure decrease.
At higher altitudes, there is less air above, so the weight of the air column and hence pressure decrease.
Which of the following statements is NOT correct about fluids in steady flow?
- A. The total mechanical energy along a streamline remains constant
- B. Pressure may decrease when speed increases
- C. Fluid speed is the same at every point in a streamline
- D. Bernoulli's equation is applicable along a streamline
Answer: C. Fluid speed is the same at every point in a streamline
In steady flow, speed can vary from point to point along a streamline; it need not remain the same.
In steady flow, speed can vary from point to point along a streamline; it need not remain the same.
A liquid does not wet a glass tube. Which statement is correct?
- A. The liquid rises in the tube due to capillarity
- B. The liquid level is depressed in the tube
- C. The contact angle is less than 90°
- D. The adhesion force is greater than cohesion force
Answer: B. The liquid level is depressed in the tube
If a liquid does not wet glass, cohesion dominates and the liquid surface is depressed, not raised.
If a liquid does not wet glass, cohesion dominates and the liquid surface is depressed, not raised.