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General Science Gk Questions

General Knowledge
37. The working of the quartz crystal in the watch is based on the
 
  • A. Johnson effect
  • B. Edison effect
  • C. Piezo electric effect
  • D. Photoelectric effect
Answer: C.
Piezo electric effect
 
38. What is the unit for measuring the pitch or frequency of sound?
 
  • A. Decibel
  • B. Hertz
  • C. Coulomb
  • D. Hum
Answer: A.
Decibel
 
 
39. In fireworks, the green flame is produced because of
 
  • A. Potassium
  • B. Sodium
  • C. Mercury
  • D. Barium
Answer: D.
Barium
 
40. The type of glass is used in making lenses and prism is
 
  • A. Jena glass
  • B. Flint glass
  • C. Pyrex glass
  • D. Soft glass
Answer: B.
Flint glass