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General Knowledge > General Science

SCIENCE FUNDAMENTALS MCQs

General Science Mixed, Science, Fundamentals Vectors

Total Questions : 736 | Page 69 of 74 pages
Question 681. Isotopes are separated by:
  1.    Crystallisation
  2.    Distillation
  3.    Filtration
  4.    Sublimation
 Discuss Question
Answer: Option B. -> Distillation
Question 682. Atoms are composed of:
  1.    Protons only
  2.    Electrons and Nuclei
  3.    Electrons and protons
  4.    Electrons only
 Discuss Question
Answer: Option B. -> Electrons and Nuclei
Question 683. In an atomic explosion, enormous energy is released which is due to
  1.    Conversion of mass into energy
  2.    Conversion of mechanical energy into nuclear energy
  3.    Conversion of neutrons into protons
  4.    Conversion of chemical energy into heat energy
 Discuss Question
Answer: Option A. -> Conversion of mass into energy
Question 684. Which of the following shows the masses of the three elementary particles in decreasing order?
  1.    Leptons, Mesons Baryons
  2.    Baryons, Mesons, Leptons
  3.    Leptons, Baryons, Mesons
  4.    Mesons, Baryons, Leptons
 Discuss Question
Answer: Option B. -> Baryons, Mesons, Leptons
Question 685. Mesons are found in
  1.    Cosmic rays
  2.    Laser beam
  3.    Gamma rays
  4.    X-rays
 Discuss Question
Answer: Option A. -> Cosmic rays
Question 686. Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
  1.    Thorium
  2.    Radium
  3.    Plutonium
  4.    Radan
 Discuss Question
Answer: Option A. -> Thorium
Question 687. The isotope of uranium capable of sustaining chain reaction is
  1.    U-239
  2.    U-245
  3.    U-235
  4.    U-238
 Discuss Question
Answer: Option C. -> U-235
Question 688. Which of the following has a least penetrating power?
  1.    Gamma rays
  2.    Beta Particles
  3.    All have same penetrating power
  4.    Alpha particles
 Discuss Question
Answer: Option D. -> Alpha particles
Question 689. 'No two electrons in an atom can have the same set of four quantum numbers' is
  1.    Bohr's law
  2.    Newton's law
  3.    Aufbau principle
  4.    Pauli's exclusion principle
 Discuss Question
Answer: Option C. -> Aufbau principle
Question 690. The dark lines in the solar spectrum are due to
  1.    Absence of corresponding wavelengths from the light emitted by the core of the sun.
  2.    Absorption of corresponding wavelengths by the outer layers of the sun.
  3.    Destructive interference between waves of certain definite wavelengths.
  4.    Absorption of corresponding wavelengths by the prism used in the photograph.
 Discuss Question
Answer: Option B. -> Absorption of corresponding wavelengths by the outer layers of the sun.

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