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ENTRANCE TEST – 2010 Multiple Questions and Answers.
| 46. | The path difference ‘BD’ for destructive interference is | ||
| A. | (m + ½) λ | ||
| B. | mλ | ||
| C. | d sin θ | ||
| D. | 3λ | ||
| 47. | In the case of a grafting spectrometer, the resolving power ‘R’ of the grating is defined as | ||
| A. | λ / Δλ | ||
| B. | λ / D | ||
| C. | λ / λ1 | ||
| D. | N x m | ||
| 48. | Which one of the following lights travels fastest in optical fibers? | ||
| A. | Visible light | ||
| B. | Ultraviolet light | ||
| C. | Ordinary light | ||
| D. | Invisible infrared light | ||
| 49. | The value of universal gas constant is | ||
| A. | 8.314 Jmol-1K-1 | ||
| B. | 8.324 Jmol-1 K-1 | ||
| C. | 7.23 Jmol-1K-1 | ||
| D. | 1.00 Jmol-1 K-1 | ||
| 50. | The turbine in a steam power plant takes steam from a boiler at 427 °C and exhausts into a low temperature reservoir at 77 °C. What is the maximum possible efficiency? | ||
| A. | 50% | ||
| B. | 40% | ||
| C. | 60% | ||
| D. | 70% | ||
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