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ENTRANCE TEST – 2010 Multiple Questions and Answers.
| 61. | An oil film floating on water surface exhibits colour pattern due to the phenomenon of: | ||
| A. | Diffraction | ||
| B. | Polarization | ||
| C. | Interference | ||
| D. | Surface tension | ||
| 63. | The value of the least distance of distinct vision or near point is ______ for a normal human eye | ||
| A. | 20 cm | ||
| B. | 25 cm | ||
| C. | 10 cm | ||
| D. | 15 cm | ||
| 64. | In a compound microscope, the magnification by objective = 20, magnification by eyepiece = 11, then the total magnification is | ||
| A. | M = -220 | ||
| B. | M = -0.19 | ||
| C. | M = -0.05 | ||
| D. | M = 220 | ||
| 65. | The distance between atoms is 0.30 nm. What will be the wavelength of X-rays at angle θ = 30o for 1st order diffraction? | ||
| A. | λ = 0.60 nm | ||
| B. | λ = 0.30 nm | ||
| C. | λ = 0.20 nm | ||
| D. | λ = 0.90 nm | ||
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