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TNPSC Physics Study Material in English

General Science
9. Which one of the following is a physical change?
 
  • A. Rusting of iron
  • B. Boiling of water
  • C. Burning of an egg
  • D. Boiling of candle
Answer: B.
Boiling of water
 
10. On adding a little antimony to germanium, we get
 
  • A. n–type semiconductor
  • B. p–type semiconductor
  • C. metallic conductor
  • D. intrinsic conductor
Answer: A.
n–type semiconductor
 
 
11. Decibel is a unit to measure the
 
  • A. Intensity of heat
  • B. Intensity of light
  • C. Intensity of sound
  • D. Intensity of radiation
Answer: C.
Intensity of sound
 
12. Which one of the following regulates and controls the entry of light into human eye?
 
  • A. Iris
  • B. Retina
  • C. Anterior chamber
  • D. Cornea
Answer: C.
Anterior chamber