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MCQs

Total Questions : 500 | Page 3 of 50 pages
Question 21. In van der walls crystals, there exists a high degree of stability of the outer electron shell.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 22. On the basis of the type of chemical bonds, solids may be classified into
  1.    Ionic crystals
  2.    Ionic and valence crystals
  3.    Ionic crystal, valence crystals and metals
  4.    Ionic crystals, valence crystals, metal and vander wall crystals
 Discuss Question
Answer: Option D. -> Ionic crystals, valence crystals, metal and vander wall crystals
Question 23. Which of the following are true for relative dielectric constant?1. It is dimensionless.2. It is equal to 1 for vacuum.3. It is equal to 1 for all substances.
  1.    1 and 2 only
  2.    2 and 3 only
  3.    1 and 3 only
  4.    1, 2 and 3
 Discuss Question
Answer: Option A. -> 1 and 2 only
Question 24. The resistance of a photoconductor
  1.    Increases with increase in light intensity
  2.    Decreases with increase in light intensity
  3.    May increase or decrease with increase in light intensity
  4.    Remains constant
 Discuss Question
Answer: Option B. -> Decreases with increase in light intensity
Question 25. In an intrinsic semiconductor, at a given temperature T
  1.    The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
  2.    The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
  3.    The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination
  4.    Any of the above
 Discuss Question
Answer: Option A. -> The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
Question 26. Electrical contact materials used in switches, brushes, relay must possess
  1.    High thermal conductivity and high melting point
  2.    Low thermal conductivity and low melting pointL
  3.    High thermal conductivity and low melting point
  4.    Low thermal conductivity and high melting point
 Discuss Question
Answer: Option A. -> High thermal conductivity and high melting point
Question 27. Ferrimagnetic materials have anti parallel orientation of equal moments of permanent dipoles.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 28. The merger of hole and free electron is called
  1.    Covalent bonding
  2.    Recombination
  3.    Thermal energy
  4.    Free electrons
 Discuss Question
Answer: Option B. -> Recombination
Question 29. Wood is a diamagnetic material.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False
Question 30. In a metal, the valence electrons
  1.    Are not shared
  2.    Are shared only between neighbouring atoms
  3.    Are shared by all atoms
  4.    Either B or C
 Discuss Question
Answer: Option C. -> Are shared by all atoms

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