- Section 1
46. |
Radio telescopes are better than optical telescopes because |
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47. |
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit |
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48. |
Mercury is commonly used as a thermometric fluid rather than water because |
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49. |
Optical fibre works on the |
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50. |
Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in |
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