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. |
If a glass tube is of insufficient length, water rises and overflows. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
Consider a capillary tube in which water has risen. The contact angle is . The radius of the capillary tube is r . The surface tension is S . And the density of water is . 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. | 2Ssin / R g |
| B. | 2S / R g |
| C. | 2Scos / R g |
| D. | 2S / r g |
| Answer» C. 2Scos / R g | |
| 3. |
The contact angle determines whether liquid will rise or get depressed along a solid surface. Select the correct statement regarding the same. |
| A. | If contact angle is found to be less than 90 , the liquid will have raise along the solid surface |
| B. | If contact angle is found to be greater than 90 , then liquid will have depressed along the solid surface |
| C. | Liquid always rises along solid surface, irrespective of contact angle |
| D. | Liquid always gets depressed along solid surface, irrespective of contact angle |
| Answer» B. If contact angle is found to be greater than 90 , then liquid will have depressed along the solid surface | |
| 4. |
A soap bubble contains two surface layers. What is the excess pressure just inside the first layer when seen from outside the bubble? |
| A. | 2S/R |
| B. | 4S/R |
| C. | -2S/R |
| D. | -4S/R |
| Answer» B. 4S/R | |
| 5. |
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 | |
| 6. |
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. | 2 RS |
| B. | R<sup>2</sup> S |
| C. | 2RS |
| D. | 0 |
| Answer» B. R<sup>2</sup> S | |
| 7. |
What will be the change in surface energy when a drop of liquid (S = 0.08N/m) is divided into 10 equal droplets? Radius of initial single drop (R)= 5cm. |
| A. | 0.1259 J |
| B. | 0.1141 J |
| C. | 0.2356 J |
| D. | 0.1765 J |
| Answer» C. 0.2356 J | |
| 8. |
The unit of surface tension is same as that of _________ |
| A. | surface energy per unit volume |
| B. | force per unit area |
| C. | surface energy per unit area |
| D. | surface energy per unit length |
| Answer» D. surface energy per unit length | |
| 9. |
Surface energy is ________________ |
| A. | kinetic energy of the surface molecules |
| B. | the force per unit length acting on surface particles |
| C. | the energy of the molecules inside the beaker |
| D. | the extra energy that the molecules at the surface have relative to molecules inside the liquid |
| Answer» E. | |