Atoms which have the same atomic number but different mass numbers are called

A. isobars

B. isomers

C. isotones

D. isotopes

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  1. X-rays are used
  2. The asteroids belt lies between the orbits of
  3. You want a supply of a small but constant current. Which of the following cells will you prefer?
  4. It is more difficult to walk on ice than on a concrete road because
  5. To produce beats it is necessary to have two waves
  6. A transformer
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  17. When the velocity of a body is halved
  18. The body of an electrical appliance is earthed in order that
  19. The colour or an opaque object is due to the colour it
  20. The brightest star visible to the naked eye is
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  24. The ballistic missile, Agni 11, tested by India has a maximum range of
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  26. A balloon ruled with hydrogen will
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  28. A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point…
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