MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What will be the terminal velocity of a rain drop of radius (r) 1mm and mass (M) 0.001g falling through air. The coefficient of viscosity of air (η) is 1.8 X 10-5Ns/m2? Neglect buoyant force. |
| A. | 20 m/s |
| B. | 29.47 m/s |
| C. | 35.8 m/s |
| D. | 40 m/s |
| Answer» C. 35.8 m/s | |
| 2. |
On which these factors does air/fluid resistance force, acting on a spherical body, not depend? |
| A. | Radius of body |
| B. | Velocity of body |
| C. | Coefficient of viscosity |
| D. | Density of body |
| Answer» E. | |
| 3. |
In a closed pipe of radius R, fluid (having some viscosity) is flowing laminarly. Which point along a cross section will have maximum speed? |
| A. | Centre |
| B. | Near the wall of pipe |
| C. | R/2 from centre |
| D. | All points will have same speed |
| Answer» B. Near the wall of pipe | |
| 4. |
A block of mass 2kg is going down an incline over a fluid having some viscosity. The block moves with a constant speed of 5m/s. Assuming that the temperature of fluid remains constant, find the coefficient of viscosity of the fluid. Angle of incline is 30° & block is a cube of side 1m. Also given that the thickness of fluid is 1cm. |
| A. | 2 poise |
| B. | 0.2 poise |
| C. | 0.17 Ns/m2 |
| D. | 1.7 poise |
| Answer» C. 0.17 Ns/m2 | |
| 5. |
What is the effect of temperature increase on viscosity of liquids and gases? |
| A. | Increases for both liquids and gases |
| B. | Increases for liquids and decreases for gases |
| C. | Increases for gases and decreases for liquids |
| D. | Decreases for both liquids and gases |
| Answer» D. Decreases for both liquids and gases | |
| 6. |
The coefficient of viscosity is equal to the ratio of shear stress to shear strain. True or False? |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
Coefficient of viscosity doesn’t depend on temperature because it is a property of the fluid. True or False? |
| A. | True |
| B. | False |
| Answer» C. | |
| 8. |
1 poise = _________ Ns/m2. Fill in the blanks. |
| A. | 0.01 |
| B. | 0.1 |
| C. | 1 |
| D. | 10 |
| Answer» C. 1 | |
| 9. |
Viscosity is said to be internal friction between fluid layers. What type of force is it? |
| A. | Electromagnetic |
| B. | Gravitational |
| C. | Weak Nuclear forces |
| D. | Strong Nuclear forces |
| Answer» B. Gravitational | |