Question
Twinkling of the Stars is due to the phenomenon ofÂ
Solution
When a ray of light travels from one medium to another it ‘bends’. This phenomenon is referred to as refraction. The atmosphere of the earth is made of different layers. It is affected by winds, varying temperatures and different densities as well. When light from a distant source (a star) passes through our turbulent (moving air) atmosphere, it undergoes refraction many times. When we finally perceive this light from a star, it appears to be twinkling.
Find the odd one out from the given alternatives.
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Select the option in which the given figure is embedded (rotation is NOT allowed).
Which two numbers (not digits) should be interchanged to make the given equation correct?
48 ÷ 3 + 12 × 4 – 6 × 7 + 21 = 27Â
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