What is the difference between a CFL and an LED lamp?
1. To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
2. The average life span of a CFL is much longer than that of an LED lamp
3. A CFL is less energy-efficient as compared to an LED lamp.
Which of the statements given above is/are correct?
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Which one of following reflects back more sunlight as compared to other three? |
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Seawater (i.e. saltwater) freezes at: |
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The Indian population receives the largest dose of ionizing radiation from: |
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What range of frequencies are usually referred to as audio frequencies for humans? |
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Titan is the largest natural satellite of planet |
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Water boils at a lower temperature on the hills because |
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Which is the longest? |
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Which of the following items will be attracted to the north pole of a permanent magnet by a magnet force? |
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The most serious environmental pollution from a nuclear reactor is |
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A temperature of 295 K is equivalent to approximately |
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