MCQOPTIONS
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MCQOPTIONS
This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Consider a capillary tube in which water has risen. The contact angle is θ. The radius of the capillary tube is ‘r’. The surface tension is ‘S’. And the density of water is ‘ρ’. What is the expression for the height of water risen in the tube? Assume the radius of meniscus to be ‘R’. Let the height of water risen in the tube be ‘h’. |
| A. | 2Ssinθ / Rρg |
| B. | 2S / Rρg |
| C. | 2Scosθ / Rρg |
| D. | 2S / rρg |
| Answer» C. 2Scosθ / Rρg | |
| 2. |
What is the value of pressure inside the bubble of radius 1cm, if the bubble is in water at a depth (H) of 1m? Assume atmospheric pressure to be 1atm, surface tension = 0.075N/m & density of water = 1000kg/m3. |
| A. | 110015 Pa |
| B. | 109985 Pa |
| C. | 26 atm |
| D. | 4 atm |
| Answer» B. 109985 Pa | |
| 3. |
Consider a spherical drop of liquid having radius ‘R’. Assume a diametric cross-section which divides the drop into two hemispheres. The hemispheres pull each other due to surface tension along the circumference of the diametrical cross-section. What is the value of this force? |
| A. | 2πRS |
| B. | πR2 S |
| C. | 2RS |
| D. | 0 |
| Answer» B. πR2 S | |