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ENTRANCE TEST – 2010 Multiple Questions and Answers.
| 41. | In a simple pendulum, the tension of the string is | ||
| A. | g cos θ | ||
| B. | mg sin θ | ||
| C. | mg cos θ | ||
| D. | mg | ||
| 43. | A source ‘Y’ of unknown frequency produces 4 beats with a source of 240 Hz and 8 beats with a sound of 252 Hz. Frequency of the source ‘Y’ is | ||
| A. | 244 Hz | ||
| B. | 236 Hz | ||
| C. | 248 Hz | ||
| D. | 246 Hz | ||
| 44. | An organ pipe closed at one end has a length of 25 cm. Wavelength of the fundamental note is | ||
| A. | 25 cm | ||
| B. | 50 cm | ||
| C. | 100 cm | ||
| D. | 75 cm | ||
| 45. | In Newton ring apparatus, at the point of contact of the lens and glass plate, the additional path difference introduced is | ||
| A. | λ/4 | ||
| B. | λ/2 | ||
| C. | λ | ||
| D. | λ/3 | ||
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