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The difference between planets and stars is

A. planets do not have light of their own whereas stars shine by their own light

B. planets do not twinkle like stars

C. planets are much smaller than stars

D. All the above

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  3. The phenomenon of radioactivity was discovered by
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  7. Resistance is measured in
  8. The nuclear model of atom was first visualised by
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  10. When a charged rod is brought near a collection of small pith balls, the balls
  11. The radius of an atom is approximately
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  13. Which of the following sets of elementary particles have nearly equal masses?
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  19. Enriched uranium means
  20. If an object is placed between two parallel plane mirrors, the number of images formed will be
  21. Drinks kept in a vacuum flask remain hot or cold as the case may be for a long time because
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  24. In the nucleus of an atom, the uncharged particle is
  25. Expansion of a rod when heated
  26. A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field…
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  28. Water has maximum density at
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