Chapter-10: Mechanical Properties of Fluids

1. Unit of Pressure is-

  • Dyne
  • N-m
  • Pascal (Pa)
  • Nm²
Answer
Pascal (Pa)

2. Unit of Thrust is –

  • Pascal (Pa)
  • Erg
  • Newton
  • N-m²
Answer
Newton

3. Unit of Density is –

  • Kg.m
  • Kg.m⁻³
  • Kg.m²
  • Kg.m³
Answer
Kg.m⁻³

4. The dimension of Pressure is –

  • [ML⁻¹T⁻²]
  • [ML⁻³]
  • [MLT⁻¹]
  • None of these
Answer
[ML⁻¹T⁻²]

5. The dimension of Density is-

  • [ML⁻¹T⁻²]
  • [ML⁻³]
  • [MLT⁻¹]
  • None of these
Answer
[ML⁻³]

6. Which of the following instrument is used for measuring atmospheric! pressure?

  • Thermometer
  • Barometer
  • Manometer
  • Hydrometer
Answer
Barometer

7. Which of the following instrument is used for measuring gauge pressure?

  • Thermometer
  • Manometer
  • Hydrometer
  • Barometer
Answer
Manometer

8. Hydraulic brakes are based on which law?

  • Torricelli’s Law
  • Boyle’s Law
  • Pascal’s Law
  • Newton’s Law
Answer
Pascal’s Law

9. Hydraulic lifts are based on which law?

  • Torricelli’s Law
  • Pascal’s Law
  • Newton’s Law
  • Newton’s Law
Answer
Pascal’s Law

10. A force of 40 N is applied on a nail, whose tip has an area of cross-section of 0.001 cm². The pressure on the tip is –

  • 4 x 10⁸ Nm⁻²
  • 4 x 10⁸ Nm²
  • 4 x 10⁴ Nm⁻²
  • None of these
Answer
4 x 10⁸ Nm⁻²

11. Which of the following is associated with liquid only and not for gases?

  • Surface tension
  • Pressure
  • Volume
  • Density
Answer
Surface tension

12. Applications of Bernoulli’s theorem can be seen in –

  • dynamic lift of an airplane
  • hydraulic press
  • helicopter
  • None of these
Answer
dynamic lift of an airplane

13. S. I. unit of surface tension is –

  • Nm
  • Nm⁻¹
  • Nm⁻²
  • Nm⁻³
Answer
Nm⁻¹

14. S. I. unit of coefficient of viscosity –

  • poise
  • dyne
  • erg
  • henry
Answer
poise

15. On the increasing temperature, the surface tension –

  • Increases
  • Decreases
  • Remains unchanged
  • None of these
Answer
Decreases

16. The dimension of viscosity is –

  • [MLT⁻²]
  • [ML⁻¹T⁻²]
  • [ML²T⁻²]
  • None of these
Answer
[ML⁻¹T⁻²]

17. The coefficient of viscosity of a liquid, on increasing temperature –

  • increases
  • Decreases
  • remains constant
  • None of these
Answer
Decreases

18. When the temperature is increased, the angle of contact of a liquid –

  • increases
  • Decreases
  • remains constant
  • None of thes
Answer
Decreases