Science General knowledge Questions

13. The working of the quartz crystal in the watch is based on the
  A.  Photoelectric effect
  B.  Johnson effect
  C.  Edison effect
  D.  Piezo electric effect
Answer
Ans: D
Piezo electric effect
14. In fireworks, the green flame is produced because of
  A.  Barium
  B.  Potassium
  C.  Sodium
  D.  Mercury
Answer
Ans: A
Barium
15. Biological death of a patient means death of tissues of the
  A.  Brain
  B.  Heart
  C.  Lungs
  D.  Kidney
Answer
Ans: A
Brain
16. Monazite is an ore of
  A.  Iron
  B.  Thorium
  C.  Titanium
  D.  Zirconium
Answer
Ans: B
Thorium
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