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General Knowledge > General Science

SCIENCE FUNDAMENTALS MCQs

General Science Mixed, Science, Fundamentals Vectors

Total Questions : 736 | Page 4 of 74 pages
Question 31. Nautical mile is a unit of distance used in:
  1.    Navigation
  2.    Road mile
  3.    Astronomy
  4.    Measuring the boundaries of a nation
 Discuss Question
Answer: Option A. -> Navigation
Question 32. Which of the following is used as a moderator in nuclear reactor?
  1.    Thorium
  2.    Graphite
  3.    Radium
  4.    Ordinary water
 Discuss Question
Answer: Option D. -> Ordinary water
Question 33. Knot is a unit of speed of which of the following?
  1.    Aeroplane
  2.    Light waves
  3.    Ship
  4.    Sound waves
 Discuss Question
Answer: Option C. -> Ship
Question 34. Which among the following is a positively charged particle emitted by a radioactive element?
  1.    Beta ray
  2.    Alpha ray
  3.    Cathode ray
  4.    Gamma ray
 Discuss Question
Answer: Option B. -> Alpha ray
Question 35. Atoms are composed of:
  1.    Electrons and protons
  2.    Electrons only
  3.    Protons only
  4.    Electrons and Nuclei
 Discuss Question
Answer: Option D. -> Electrons and Nuclei
Question 36. In an atomic explosion, enormous energy is released which is due to
  1.    Conversion of chemical energy into heat energy
  2.    Conversion of mechanical energy into nuclear energy
  3.    Conversion of mass into energy
  4.    Conversion of neutrons into protons
 Discuss Question
Answer: Option C. -> Conversion of mass into energy
Question 37. The wavelength of X-rays is of the order of
  1.    10 micron
  2.    1 angstrom
  3.    1 cm
  4.    1 m
 Discuss Question
Answer: Option B. -> 1 angstrom
Question 38. Isotopes are separated by:
  1.    Crystallisation
  2.    Sublimation
  3.    Distillation
  4.    Filtration
 Discuss Question
Answer: Option C. -> Distillation
Question 39. Mesons are found in
  1.    Laser beam
  2.    X-rays
  3.    Gamma rays
  4.    Cosmic rays
 Discuss Question
Answer: Option D. -> Cosmic rays
Question 40. 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

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