Which of the following elements is non-radioactive?

A. Uranium

B. Plutonium

C. Thorium

D. Zirconium

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Which of the following is the lightest metal ?
  2. The metal used in storage batteries
  3. The major ingredient of leather is
  4. The colour of Emerald is
  5. Water has maximum density at
  6. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  7. Nitrification means
  8. Brass gets discoloured in air due to the presence of which gas in air
  9. The element present in the largest amount in rocks and minerals is
  10. Which of the following is in liquid form at room temperature ?
  11. The fastest-running terrestrial animal is
  12. Permanent hardness of water can be removed by adding
  13. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  14. The metal that is present in Photo Films is
  15. The type of glass used in making prisms and lenses is
  16. In an atomic nucleus, neutrons and protons are held together by
  17. Rust is
  18. Lightening cause rainfall because
  19. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  20. Pollination by birds is called
  21. The speed of light with the rise in the temperature of the medium
  22. The fastest acting enzyme in the biological kingdom is
  23. Liquefied Petroleum gas (LPG) consists of mainly
  24. Earth's seasons are caused by which of the following?
  25. Epoxy resins is used as
  26. What is the unit for measuring the pitch or frequency of sound ?
  27. The intencity of Earthquakes is measured on
  28. Polythene is industrially prepared by the polymerisation of
  29. The property of a substance to absorb moisture from the air on exposure is called
  30. The hardest substance available on earth is