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MCQs

Total Questions : 166 | Page 4 of 17 pages
Question 31. Piezoelectric materials serve as a source of ________ .
  1.    Resonant waves
  2.    Musical waves
  3.    Microwaves
  4.    Ultrasonic waves
 Discuss Question
Answer: Option D. -> Ultrasonic waves
Question 32. The tiny block formed by the arrangement of a small group of atoms is called the
  1.    Unit cell
  2.    Space lattice
  3.    Either A or B
  4.    None of the above
 Discuss Question
Answer: Option A. -> Unit cell
Question 33. The number of atoms per unit cell in B.C.C. structure is
  1.    1
  2.    2
  3.    4
  4.    8
 Discuss Question
Answer: Option B. -> 2
Question 34. Which of the following variety of copper has the best conductivity ?
  1.    Induction hardened copper
  2.    Hard drawn copper
  3.    Pure annealed copper
  4.    Copper containing traces of silicon
 Discuss Question
Answer: Option C. -> Pure annealed copper
Question 35. The kinetic energy of a bounded electron is
  1.    Less than that of unbounded electron
  2.    Greater than that of unbounded electron
  3.    Equal to that of unbounded electron
  4.    Infinite
 Discuss Question
Answer: Option A. -> Less than that of unbounded electron
Question 36. Super conductivity can be destroyed by
  1.    Adding impurities
  2.    Reducing temperatures
  3.    Application of magnetic field
  4.    Any of the above
 Discuss Question
Answer: Option C. -> Application of magnetic field
Question 37. The conductivity of a conductor can be increased by
  1.    Decreasing its temperature
  2.    Increasing its temperature
  3.    Decreasing its vibration
  4.    Increasing its vibration
 Discuss Question
Answer: Option A. -> Decreasing its temperature
Question 38. ________ has the best damping properties.
  1.    Diamond
  2.    High speed steel
  3.    Mild steel
  4.    Cast iron
 Discuss Question
Answer: Option D. -> Cast iron
Question 39. Mercury as an electric contact material is
  1.    A liquid
  2.    A metal
  3.    A metal liquid
  4.    A gas
 Discuss Question
Answer: Option C. -> A metal liquid
Question 40. The conductors have transport phenomena of electrons due to
  1.    Electric field
  2.    Magnetic field
  3.    Electromagnetic field
  4.    None of the above
 Discuss Question
Answer: Option A. -> Electric field

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