MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A substance breaks down by a stress of (106 N)/m2. If the density of the material of the wire is 3 (103) kg/m3, then the length of the wire of the substance which will break under its own weight when suspended vertically will be ___________ |
| A. | 66.6m |
| B. | 60.0m |
| C. | 33.3m |
| D. | 30.3m |
| Answer» D. 30.3m | |
| 2. |
The diameter of brass rod is 4mm. Young s modulus of brass is 9 109 N/m2. The force required to stretch 0.1% of its length is ___________ |
| A. | 360 N |
| B. | 36N |
| C. | 36 10<sup>5</sup> N |
| D. | 144 10<sup>3</sup>N |
| Answer» B. 36N | |
| 3. |
The breaking stress of a wire depends upon ___________ |
| A. | Length of the wire |
| B. | Radius of the wire |
| C. | Material of the wire |
| D. | Shape of the cross-section |
| Answer» D. Shape of the cross-section | |
| 4. |
A stretched rubber has ___________ |
| A. | Increased kinetic energy |
| B. | Increased potential energy |
| C. | Decreased kinetic energy |
| D. | Decreased potential energy |
| Answer» C. Decreased kinetic energy | |
| 5. |
If in a wire of Young s modulus Y, longitudinal strain is produced, then the value of potential energy stored in its unit volume will be ___________ |
| A. | YX<sup>2</sup> |
| B. | 0.5Y<sup>2</sup> X |
| C. | 2YX<sup>2</sup> |
| D. | 0.5YX<sup>2</sup> |
| Answer» E. | |
| 6. |
According to Hooke s law of elasticity, if stress is increased, the ratio of stress to strain? |
| A. | Increased |
| B. | Decreased |
| C. | Becomes zero |
| D. | Remains constant |
| Answer» E. | |
| 7. |
Energy stored in stretching a string per unit volume is ___________ |
| A. | 1/2 stress strain |
| B. | stress strain |
| C. | Y(Strain)<sup>2</sup> |
| D. | 1/2 Y(Stress)<sup>2</sup> |
| Answer» B. stress strain | |
| 8. |
A cube is subjected to a uniform volume compression. If the side of the cube decreases by 2%, the bulk strain is ___________ |
| A. | 0.02 |
| B. | 0.03 |
| C. | 0.04 |
| D. | 0.06 |
| Answer» E. | |
| 9. |
There are two wires of same material and same length while the diameter of second wire is two times the diameter of first wire, then the ratio of extension the diameter of first wire, then the ratio of extension produced in the wire by applying same load will be _____________ |
| A. | 1:1 |
| B. | 2:1 |
| C. | 1:2 |
| D. | 4:1 |
| Answer» E. | |