Engineering :: Engineering Materials
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| 311. |
Which of the following is not a semi-conductor? |
| A. |
Silicon |
B. |
Tetraethyl lead |
| C. |
Gallium Arsenide |
D. |
Germanium |
| E. |
All of the above |
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Answer: Option B
Explanation:
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| 312. |
A hydrogen atom has |
| A. |
Two electrons |
B. |
No neutrons |
| C. |
No protons |
D. |
One each electron, neutron and proton |
| E. |
None of the above |
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Answer: Option B
Explanation:
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| 313. |
Which of the following ray has least wavelength? |
| A. |
Cosmic rays |
B. |
X-rays |
| C. |
Ultraviolet rays |
D. |
Infra-red rays |
| E. |
Yellow light rays |
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Answer: Option A
Explanation:
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| 314. |
X-rays cannot penetrate through |
Answer: Option B
Explanation:
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| 315. |
Which of the following rays are neither deflected by electric field nor by magnetic field? |
| A. |
?-rays |
B. |
?-rays |
| C. |
?-rays |
D. |
X-rays |
| E. |
None of the above |
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Answer: Option C
Explanation:
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| 316. |
Silicon steel used for electrical purposes has silicon percentage of |
Answer: Option D
Explanation:
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| 317. |
Which of the following materials have maximum magnetic permeability? |
| A. |
Pure iron |
B. |
4% silicon steel |
| C. |
Gram oriented Si-Fe |
D. |
Iron carbide |
Answer: Option C
Explanation:
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| 318. |
In fibre glass reinforced plastics, the glass fibres are primarily used to improve |
| A. |
Mechanical properties of plastics |
B. |
Electrical properties of plastics |
| C. |
Thermal properties of plastics |
D. |
Surface properties of plastics |
| E. |
None of the above |
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Answer: Option A
Explanation:
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| 319. |
The Miller indices of the diagonal plane of a cube are |
Answer: Option A
Explanation:
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| 320. |
Dislocations in materials are |
| A. |
Point defects |
B. |
Line defects |
| C. |
Planer defects |
D. |
Either point or planer defects |
| E. |
Either point, line or planer defects |
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Answer: Option B
Explanation:
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