Science General knowledge Questions

1. Which among the following is a positively charged particles emitted by a radioactive element?
  A.  Alpha ray
  B.  Beta ray
  C.  Gamma ray
  D.  Cathode ray
Answer
Ans: A
Alpha ray
2. What is the unit for measuring the pitch or frequency of sound?
  A. Hum
  B. Decibel
  C. Coulomb
  D. Hertz
Answer
Ans: B
Decibel
3. Potassium permanganate is used for purifying drinking water, because
  A.  It is an oxidising agent
  B.  It is a reducing agent
  C.  It dissolves the impurities of water
  D.  It is a sterilising agent
Answer
Ans: A
It is an oxidising agent
4. Hemoglobin is dissolved in the plasma of
  A.  Earthworm
  B.  Frog
  C.  Fish
  D.  Man
Answer
Ans: A
Earthworm
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