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Which of the following rays has the highest penetrative power?

A. ± -rays

B. ² -rays

C. ³ -rays

D. X-rays

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  1. The temperature of a large bucket-full of hot water (a few degrees below boiling point) is lower than…
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  3. In the case of bodies falling under gravity which of the following remains constant at a given place?
  4. When ice melts, Its volume
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  14. The velocity of sound in air increases with
  15. Halley's comet appears in the heavens once in
  16. Solids have definite shapes. This is because
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  18. How is it that Pluto is not always the farthest planet of the solar system?
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  20. In very cold countries alcohol is used as a thermometric liquid because
  21. The planet that is known as earth's twin is
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  23. Solar radiation is preferred to other sources of energy because
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  25. The number of galaxies that are visible without telescope on clear dark nights and away from bright…
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  27. The image of an object formed on the retina of the eye is
  28. When a whistling engine approaches a person standing on the platform, the frequency or the note
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