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SCIENCE FUNDAMENTALS MCQs

General Science Mixed, Science, Fundamentals Vectors

Total Questions : 736 | Page 5 of 74 pages
Question 41. Which of the following shows the masses of the three elementary particles in decreasing order?
  1.    Leptons, Baryons, Mesons
  2.    Mesons, Baryons, Leptons
  3.    Baryons, Mesons, Leptons
  4.    Leptons, Mesons Baryons
 Discuss Question
Answer: Option C. -> Baryons, Mesons, Leptons
Question 42. What is the wavelength of visible spectrum?
  1.    8500 - 9800 angstrom
  2.    7800 - 8000 angstrom
  3.    3900 - 7600 angstrom
  4.    1300 - 3000 angstrom
 Discuss Question
Answer: Option C. -> 3900 - 7600 angstrom
Question 43. Which of the following has a least penetrating power?
  1.    All have same penetrating power
  2.    Beta Particles
  3.    Alpha particles
  4.    Gamma rays
 Discuss Question
Answer: Option C. -> Alpha particles
Question 44. The age of most ancient geological formations is estimated by
  1.    Ra - Si method
  2.    Potassium - argon method
  3.    C14 method
  4.    Uranium - lead method
 Discuss Question
Answer: Option C. -> C14 method
Question 45. The isotope of uranium capable of sustaining chain reaction is
  1.    U-235
  2.    U-245
  3.    U-239
  4.    U-238
 Discuss Question
Answer: Option A. -> U-235
Question 46. Who suggested that most of the mass of the atom is located in the nucleus?
  1.    Thompson
  2.    Bohr
  3.    Rutherford
  4.    Einstein
 Discuss Question
Answer: Option C. -> Rutherford
Question 47. 'No two electrons in an atom can have the same set of four quantum numbers' is stated in
  1.    Newton's law
  2.    Bohr's law
  3.    Aufbau principle
  4.    Pauli's exclusion principle
 Discuss Question
Answer: Option D. -> Pauli's exclusion principle
Question 48. The dark lines in the solar spectrum are due to
  1.    Absorption of corresponding wavelengths by the outer layers of the sun.
  2.    Destructive interference between waves of certain definite wavelengths.
  3.    Absorption of corresponding wavelengths by the prism used in the photograph.
  4.    Absence of corresponding wavelengths from the light emitted by the core of the sun.
 Discuss Question
Answer: Option A. -> Absorption of corresponding wavelengths by the outer layers of the sun.
Question 49. In an atomic nucleus, neutrons and protons are held together by:
  1.    Gravitational forces
  2.    Exchange forces
  3.    Coulombic forces
  4.    Magnetic forces
 Discuss Question
Answer: Option B. -> Exchange forces
Question 50. According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called:
  1.    A molecule
  2.    A cation
  3.    An anion
  4.    An atom
 Discuss Question
Answer: Option A. -> A molecule

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