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MCQs

Total Questions : 166 | Page 15 of 17 pages
Question 141. The intensity of magnetization, M, of a ferro magnetic solid
  1.     depends on method of heating.
  2.     decreases with increasing temperature.
  3.     is independent of temperature.
  4.     increases with increasing temperature.
 Discuss Question
Answer: Option B. ->  decreases with increasing temperature.
Question 142. When the atomic magnetic moments are randomly oriented in a solid its magnetic behavior is termed as
  1.     poly crystalline.
  2.     semi-magnetic.
  3.     paramagnetic.
  4.     anti-ferromagnetic.
 Discuss Question
Answer: Option C. ->  paramagnetic.
Question 143. When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as
  1.     magnetic expansion.
  2.     magneto-calorisation.
  3.     magnetic hysteresis.
  4.     magnetostriction.
 Discuss Question
Answer: Option D. ->  magnetostriction.
Question 144. In ferromagnetic materials
  1.     the constituent is only iron.
  2.     one of the constituent is iron.
  3.     the atomic magnetic moments are parallel.
  4.     the atomic magnetic moments are antiparallel and unequal.
 Discuss Question
Answer: Option C. ->  the atomic magnetic moments are parallel.
Question 145. Magnetic recording tape is most commonly made from
  1.     small particles of iron.
  2.     iron-dust.
  3.     silicon-iron.
  4.     ferric-oxide.
 Discuss Question
Answer: Option C. ->  silicon-iron.
Question 146. The temperature beyond which substances lose their ferroelectric properties, is known as
  1.     conversion temperature.
  2.     curie temperature.
  3.     inversion temperature.
  4.     critical temperature.
 Discuss Question
Answer: Option B. ->  curie temperature.
Question 147. The permeability of iron can be increased by
  1.     purifying it.
  2.     alloying with cobalt.
  3.     reducing carbon percentage.
  4.     increasing carbon percentage.
 Discuss Question
Answer: Option B. ->  alloying with cobalt.
Question 148. A material with unequal anti-parallel atomic magnetic moments is
  1.     a ferrite.
  2.     ferrimagnet.
  3.     non-magnetic.
  4.     an anti-ferromagnet.
 Discuss Question
Answer: Option B. ->  ferrimagnet.
Question 149. Positive magnetostriction exists when
  1.     dipoles are attract each other.
  2.     none of above.
  3.     dipoles are repel other.
  4.     both are correct.
 Discuss Question
Answer: Option C. ->  dipoles are repel other.
Question 150. The permanent magnets are made from which of following materials ?
  1.     Ferromagnetic.
  2.     Soft iron.
  3.     Paramagnetic.
  4.     Diamagnetic.
 Discuss Question
Answer: Option A. ->  Ferromagnetic.

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