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MCQs

Total Questions : 166 | Page 14 of 17 pages
Question 131. The atomic radius in case of face centered cubic lattice is
  1.     a / 4.
  2.     a / 2.
  3.     a.
  4.     a / 3.
 Discuss Question
Answer: Option B. ->  a / 2.
Question 132. The electron configuration of copper is
  1.     1s2 , 2s2 2p6, 3s2 3p6 3d8, 4s1 4p
  2.     1s2 , 2s2 2p6, 3s2 3p6 3d10, 4s1.
  3.     none of above.
  4.     1s2 , 2s2 2p6, 3s2 3p6 3d9, 4s2.
 Discuss Question
Answer: Option B. ->  1s2 , 2s2 2p6, 3s2 3p6 3d10, 4s1.
Question 133. The materials which exhibit the same elastic properties in all directions are called
  1.     isentropic.
  2.     inelastic.
  3.     isotropic.
  4.     visco elastic.
 Discuss Question
Answer: Option C. ->  isotropic.
Question 134. In Bohr’s model of atomic structure, the nucleus consists of
  1.     electrons and protons.
  2.     protons.
  3.     electrons.
  4.     protons and neutrons.
 Discuss Question
Answer: Option D. ->  protons and neutrons.
Question 135. Permittivity of free space is equal to
  1.     8.854 × 10 - 12 F / m.
  2.     8.854 × 10 - 11 F / m.
  3.     8.854 × 10 - 13 F / m.
  4.     8.854 × 10 - 10 F / m.
 Discuss Question
Answer: Option A. ->  8.854 × 10 - 12 F / m.
Question 136. Which of the following is the ferroelectric material ?
  1.    All of these
  2.     Barium titanate.
  3.     Potassium dihydrogen phosphate.
  4.     Rochelle salt.
 Discuss Question
Answer: Option A. -> All of these
Question 137. Materials which lack permanent magnetic dipoles are called
  1.    None of these
  2.     ferro-magnectic.
  3.     semi-magnetic.
  4.     dia-magnetic.
 Discuss Question
Answer: Option D. ->  dia-magnetic.
Question 138. Absolute permittivity of a dielectric medium is represented by
  1.     εr / εo.
  2.     εoεr.
  3.     εo / εr.
  4.    None of these
 Discuss Question
Answer: Option B. ->  εoεr.
Question 139. The dielectric strength of ferroelectric materials depends to a large extent on
  1.     intensity of electric field.
  2.     presence of magnetic materials in the vicinity.
  3.     area of hysteresis loop for the material.
  4.     frequency of applied voltage.
 Discuss Question
Answer: Option A. ->  intensity of electric field.
Question 140. Materials having a high dielectric constant, which is non-linear, are known as
  1.     elastomers.
  2.     hard die-electrics.
  3.     ferroelectric materials.
  4.     super die-electrics.
 Discuss Question
Answer: Option C. ->  ferroelectric materials.

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