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. |
A wire has a cross sectional area A , length L and young s modulus Y . It is pulled by a force F which causes a total extension of length l . The force F is so adjusted that the wire is only slowly stretched. Find the work done by the force in pulling the string by a length dx when extension is x (0 > x > l). |
| A. | *stress*strain*volume |
| B. | (AY/L)xdx |
| C. | F*l |
| D. | *stress * strain |
| Answer» C. F*l | |
| 2. |
Which of the following stresses causes change in density, as long as force acts on the body? |
| A. | Shear stress |
| B. | Compressive Stress |
| C. | Tensile stress |
| D. | Volumetric stress |
| Answer» E. | |
| 3. |
A lake has a depth of 500m. The bulk modulus of water is 2*109N/m2. Calculate the fractional compression, V/V, of water at the bottom of the lake. |
| A. | 2.5*10<sup>-3</sup> |
| B. | 7*10<sup>-3</sup> |
| C. | 3.5*10<sup>-3</sup> |
| D. | 5*10<sup>-3</sup> |
| Answer» B. 7*10<sup>-3</sup> | |
| 4. |
Select the correct option. B is bulk modulus. |
| A. | B<sub>gas</sub> > B<sub>liquid</sub> > B<sub>solid</sub> |
| B. | B<sub>liquid</sub> > B<sub>gas</sub>> B<sub>solid</sub> |
| C. | B<sub>solid</sub> > B<sub>liquid</sub> > B<sub>gas</sub> |
| D. | B<sub>liquid</sub> > B<sub>gas</sub> > B<sub>solid</sub> |
| Answer» D. B<sub>liquid</sub> > B<sub>gas</sub> > B<sub>solid</sub> | |
| 5. |
A 10N force is uniformly distributed over the surface of a sphere of radius 20cm. The force at each point acts inward along the normal at that point. Find the fractional change in volume if the compressibility of the sphere is 10-11m2/N. |
| A. | 3*10<sup>-10</sup> |
| B. | 1.5*10<sup>-11</sup> |
| C. | 1.98*10<sup>-10</sup> |
| D. | 2*10<sup>-11</sup> |
| Answer» D. 2*10<sup>-11</sup> | |
| 6. |
Bulk modulus is defined as -P / ( V/V). Therefore it can be negative. True or False? |
| A. | True |
| B. | False |
| Answer» C. | |
| 7. |
Which of the following represents volumetric strain? |
| A. | - V/V |
| B. | V/V |
| C. | Pressure/Volume |
| D. | -P / ( V/V) |
| Answer» C. Pressure/Volume | |
| 8. |
A small body having mass 1kg is rotating in a circle of radius 10cm. It is connected to the centre with the help of a string having young s modulus = 1011N/m2. Find change in length of wire while the mass is rotating with constant speed of 2m/s. The cross sectional area of string is 1cm2. |
| A. | 0.4 m |
| B. | 4 m |
| C. | 40 m |
| D. | 0.4m |
| Answer» B. 4 m | |
| 9. |
Which of the following quantities have the same S.I. unit as that of modulus of elasticity? |
| A. | Energy per unit volume |
| B. | Force per unit length |
| C. | Energy |
| D. | Change in length |
| Answer» B. Force per unit length | |