Chemistry MCQs with answers Page - 35

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Q. The substance coated on plastic tape recorder tapes is

  • (A) iron oxide
  • (B) iron sulphate
  • (C) zinc oxide
  • (D) magnesium oxide

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Q. The main purification/separation procedure used in petroleum industry is

  • (A) sedimentation
  • (B) chromatography
  • (C) fractional distillation
  • (D) steam distillation

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Q. Consider the following statements:
1.In a resting neuron, there is difference in electrical charge on either side of surface membrane called potential difference.
2.It is due to unequal distribution of K+ ions and Na+ ions on either side if the membrane.
3.The Na+ concentration inside a cell is about 28 to 30 times > than it is outside
4.The K+ ions concentration is about 14 times > outside than inside. Which of these above statements are correct?

  • (A) 1 only
  • (B) 1, 2
  • (C) 1, 2, 3, 4
  • (D) 1, 2, 3

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Q. The main reason for some neurons being myelinated is to

  • (A) protect the nerve against physical damage
  • (B) decrease the possibility of false triggering from nearby muscle activity
  • (C) increase the diameter of the axon to slow the speed of the action potential
  • (D) increase the speed of the action potential

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Q. What does one mole of H2O correspond to

  • (A) 20 gms
  • (B) 16 gms
  • (C) 22 gms
  • (D) 18 gms

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Q. The difference between a nuclear reactor and atomic bomb is that ___________

  • (A) no-chain reaction takes place in atomic bomb while it takes place in nuclear reactor
  • (B) the chain reaction in nuclear reactor is not controlled
  • (C) no chain reaction takes place in nuclear reactor while in the atomic bomb there is a chain reaction
  • (D) the chain reaction in nuclear reactor is controlled

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Q. What is the effect of increase in concentration on the Molar conductivity?

  • (A) It increases
  • (B) It decreases
  • (C) It remains constant
  • (D) None of the above

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Q. Choose the correct statement about corrosion:

  • (A) Corrosion of metals is an electrochemical phenomenon
  • (B) Bisphenol can be used to cover the metal surface to prevent corrosion
  • (C) Both a and b
  • (D) None

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Q. Which of the following carbon compound is used as liquid rocket fuel?

  • (A) Carbon Tetrachloride
  • (B) Methane
  • (C) Propane
  • (D) All of Above