MCQOPTIONS
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MCQOPTIONS
This section includes 32 Mcqs, each offering curated multiple-choice questions to sharpen your Fluid Mechanics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following is an application of surface tension? |
| A. | Use of soaps and detergents as cleansing agents |
| B. | Molecular structure can be elucidated by surface tension measurements through parachor values |
| C. | Surfactants are incorporated in preparations like toothpaste |
| D. | All of the mentioned |
| Answer» E. | |
| 2. |
On increasing the temperature, the surface tension of the liquid ____________ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of the mentioned |
| Answer» C. Remains constant | |
| 3. |
Shapes of drops of liquid are spherical because of ____________ |
| A. | Viscosity |
| B. | Conductivity |
| C. | Absorption |
| D. | Surface tension |
| Answer» E. | |
| 4. |
On increasing the temperature, the kinetic energy of the liquid molecules ____________ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of the mentioned |
| Answer» B. Decreases | |
| 5. |
The surface tension of water at 250C is ____________ |
| A. | 90.0 dynes/cm |
| B. | 45.63 dynes/cm |
| C. | 82.5 dynes/cm |
| D. | 72.14 dynes/cm |
| Answer» E. | |
| 6. |
Stalagmometer is cleaned to remove grease with the help of ____________ |
| A. | Chromic acid |
| B. | Sulphuric acid |
| C. | Distilled water |
| D. | Tartaric acid |
| Answer» B. Sulphuric acid | |
| 7. |
The apparatus used for the determination of surface tension of a liquid is ____________ |
| A. | Oedometer |
| B. | Stalagmometer |
| C. | Consolidometer |
| D. | None of the mentioned |
| Answer» C. Consolidometer | |
| 8. |
The unit of surface tension in the CGS system is ____________ |
| A. | N/m |
| B. | Kg/cm |
| C. | Dynes/cm |
| D. | Dynes/m |
| Answer» D. Dynes/m | |
| 9. |
A water drop of diameter 1 cm breaks into 1000 similar droplets of same diameter. What will be the gain or loss in the surface energy? (Take surface tension as 0.075 N/m) |
| A. | gain of 0.424 mJ |
| B. | gain of 0.212 mJ |
| C. | loss of 0.212 mJ |
| D. | loss of 0.424 mJ |
| Answer» C. loss of 0.212 mJ | |
| 10. |
If a glass tube of 10 mm diameter is immersed in water, what will be the rise or fall in capillary?(Take surface tension = 0.075 N/m, g = 10 m/s2 and angle of contact = 0) |
| A. | 0.75 |
| B. | 1.5 |
| C. | 3 |
| D. | 6 |
| Answer» D. 6 | |
| 11. |
The ratio of the surface tension S and density ρ of liquid 1 and 2 are 1:2 and 1:4 respectively. Equal amount of the two liquids is poured into two identical tubes. what will be the ratio of the rise in the liquid level in the two tubes? (Assume the angle of contact to be same) |
| A. | 1:2 |
| B. | 2:1 |
| C. | 8:1 |
| D. | 1:8 |
| E. | 1:2b) 2:1c) 8:1d) 1:8 |
| Answer» C. 8:1 | |
| 12. |
A liquid jet of 5 cm diameter has a pressure difference of N/m2. (Take surface tension as 0.075 N/m) |
| A. | 12 |
| B. | 6 |
| C. | 3 |
| D. | 1.5 |
| Answer» E. | |
| 13. |
A soap bubble of d mm diameter is observed inside a bucket of water. If the pressure inside the bubble is 0.075 N/cm2, what will be the value of d? (Take surface tension as 0.075 N/m) |
| A. | 0.4 |
| B. | 0.8 |
| C. | 1.6 |
| D. | 4 |
| Answer» C. 1.6 | |
| 14. |
What will be the diameter (in mm) of a water droplet, the pressure inside which is 0.05 N/cm2 greater than the outside pressure? (Take surface tension as 0.075 N/m) |
| A. | 3 |
| B. | 0.3 |
| C. | 0.6 |
| D. | 6 |
| Answer» D. 6 | |
| 15. |
A soap film is trapped between a frame and a wire of length 10 cm as shown.If the surface tension is given as 0.0049 N/m, what will be the value of m (in mg) such that the wire remains in equilibrium? |
| A. | 0.1 |
| B. | 1 |
| C. | 10 |
| D. | 100 |
| Answer» E. | |
| 16. |
ON_INCREASING_THE_TEMPERATURE,_THE_SURFACE_TENSION_OF_THE_LIQUID?$ |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of the mentioned |
| Answer» C. Remains constant | |
| 17. |
IF_A_GLASS_TUBE_OF_10_MM_DIAMETER_IS_IMMERSED_IN_WATER,_WHAT_WILL_BE_THE_RISE_OR_FALL_IN_CAPILLARY??$ |
| A. | |
| B. | 0.75 |
| C. | 1.5 |
| D. | 3 |
| Answer» D. 3 | |
| 18. |
Which_of_the_following_is_an_application_of_surface_tension?$ |
| A. | Use of soaps and detergents as cleansing agents |
| B. | Molecular structure can be elucidated by surface tension measurements through parachor values |
| C. | Surfactants are incorporated in preparations like toothpaste |
| D. | All of the mentioned |
| Answer» E. | |
| 19. |
A_water_drop_of_diameter_1_cm_breaks_into_1000_similar_droplets_of_same_diameter._What_will_be_the_gain_or_loss_in_the_surface_energy?_(Take_surface_tension_as_0.075_N/m)$ |
| A. | gain of 0.424 mJ |
| B. | gain of 0.212 mJ |
| C. | loss of 0.212 mJ |
| D. | loss of 0.424 mJ |
| Answer» C. loss of 0.212 mJ | |
| 20. |
The rise in the level of a liquid in a tube is h. If half the amount is poured outside, what will be the new rise in liquid level? |
| A. | 0 |
| B. | h/2 |
| C. | h |
| D. | 2h |
| Answer» D. 2h | |
| 21. |
Shapes of drops of liquid are spherical because of |
| A. | Viscosity |
| B. | Conductivity |
| C. | Absorption |
| D. | Surface tension |
| Answer» E. | |
| 22. |
The ratio of the surface tension S and density ρ of liquid 1 and 2 are 1:2 and 1:4 respectively. Equal amount of the two liquids is poured into two identical tubes. what will be the ratio of the rise in the liquid level in the two tubes? (Assume the angle of contact to be same)$ |
| A. | 1:2 |
| B. | 2:1 |
| C. | 8:1 |
| D. | 1:8 |
| Answer» C. 8:1 | |
| 23. |
In case of water and glass, we get a concave meniscus because the adhesive force between water and glass are _______________ than the cohesive forces between water molecules. |
| A. | Weaker |
| B. | Stronger |
| C. | Same |
| D. | None of the mentioned |
| Answer» C. Same | |
| 24. |
The rise in the level of a liquid in a tube is h. What will be the rise in the level if the same amount of liquid is poured into a tube of half the diameter. |
| A. | 0 |
| B. | h/2 |
| C. | h |
| D. | 2h |
| Answer» E. | |
| 25. |
On increasing the temperature, the kinetic energy of the liquid molecules |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of the mentioned |
| Answer» B. Decreases | |
| 26. |
A liquid jet of 5 cm diameter has a pressure difference of N/m2. (Take surface tension as 0.075 N/m) |
| A. | 12 |
| B. | 6 |
| C. | 3 |
| D. | 1.5 |
| Answer» E. | |
| 27. |
The surface tension of water at 250C is |
| A. | 90.0 dynes/cm |
| B. | 45.63 dynes/cm |
| C. | 82.5 dynes/cm |
| D. | 72.14 dynes/cm |
| Answer» E. | |
| 28. |
A soap bubble of d mm diameter is observed inside a bucket of water. If the pressure inside the bubble is 0.075 N/cm2, what will be the value of d? (Take surface tension as 0.075 N/m) |
| A. | 0.4 |
| B. | 0.8 |
| C. | 1.6 |
| D. | 4 |
| Answer» C. 1.6 | |
| 29. |
Stalagmometer is cleaned to remove grease with the help of |
| A. | Chromic acid |
| B. | Sulphuric acid |
| C. | Distilled water |
| D. | Tartaric acid |
| Answer» B. Sulphuric acid | |
| 30. |
What will be the diameter (in mm) of a water droplet, the pressure inside which is 0.05 N/cm2 greater than the outside pressure? (Take surface tension as 0.075 N/m) |
| A. | 3 |
| B. | 0.3 |
| C. | 0.6 |
| D. | 6 |
| Answer» D. 6 | |
| 31. |
The apparatus used for the determination of surface tension of a liquid is |
| A. | Oedometer |
| B. | Stalagmometer |
| C. | Consolidometer |
| D. | None of the mentioned |
| Answer» C. Consolidometer | |
| 32. |
Which of the following contribute to the reason behind the origin of surface tension? |
| A. | only cohesive forces |
| B. | only adhesive forces |
| C. | neither cohesive forces nor adhesive forces |
| D. | both cohesive forces and adhesive forces |
| Answer» E. | |