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MCQs

Total Questions : 1678 | Page 42 of 168 pages
Question 411. Most abundant molecular ions are
  1.    Anions
  2.    Cations
  3.    Neutral ions
  4.    Sulphur ions
 Discuss Question
Answer: Option B. -> Cations
Answer: (b).Cations
Question 412. Elements with even number of isotopes are
  1.    156
  2.    154
  3.    153
  4.    152
 Discuss Question
Answer: Option B. -> 154
Answer: (b).154
Question 413. Instrument use to measure exact 'atomic masses' is
  1.    Mass spectrometer
  2.    spectrometer
  3.    nanometer
  4.    both a and b
 Discuss Question
Answer: Option A. -> Mass spectrometer
Answer: (a).Mass spectrometer
Question 414. In accelerating chamber of mass spectrometer potential difference is
  1.    500-2000
  2.    600-7000
  3.    300-8000
  4.    700-9000
 Discuss Question
Answer: Option A. -> 500-2000
Answer: (a).500-2000
Question 415. Isotopes have same
  1.    atomic mass
  2.    atomic number
  3.    molecules
  4.    atoms
 Discuss Question
Answer: Option B. -> atomic number
Answer: (b).atomic number
Question 416. The residence time of NO and NO₂ in atmosphere are respectively in days
  1.    One and Two
  2.    Two and Three
  3.    Three and Four
  4.    Four and Three
 Discuss Question
Answer: Option D. -> Four and Three
Answer: (d).Four and Three
Question 417. Acidification of soil can leach metals
  1.    Al
  2.    Hg
  3.    Pb
  4.    Ca
 Discuss Question
Answer: Option D. -> Ca
Answer: (d).Ca
Question 418. Paddy fields produce significant amount of gas
  1.    CH₄
  2.    C₂H₆
  3.    C₃H₈
  4.    C₄H₁₀
 Discuss Question
Answer: Option A. -> CH₄
Answer: (a).CH₄
Question 419. Mean residence time of methane in atmosphere in years is
  1.    One to Seven
  2.    Two to Seven
  3.    Three to Seven
  4.    Four to Seven
 Discuss Question
Answer: Option C. -> Three to Seven
Answer: (c).Three to Seven
Question 420. 1-9 % of sulphur is present in
  1.    Air
  2.    Coke
  3.    Coal
  4.    Coal tar
 Discuss Question
Answer: Option C. -> Coal
Answer: (c).Coal

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