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MCQs

Total Questions : 38 | Page 2 of 4 pages
Question 11. What is the unit of polarization?
  1.    Cm
  2.    Vm⁻¹
  3.    Cm⁻²
  4.    Fm²
 Discuss Question
Answer: Option C. -> Cm⁻²
Answer: (c).Cm⁻²
Question 12. What is the charge of an electron?
  1.    1.602 * 10⁻¹⁶
  2.    1.602 * 10⁻¹⁷
  3.    1.602 * 10⁻¹⁸
  4.    1.602 * 10⁻¹⁹
 Discuss Question
Answer: Option D. -> 1.602 * 10⁻¹⁹
Answer: (d).1.602 * 10⁻¹⁹
Question 13. Which of the following factors are relevant for change in dielectric strength?
  1.    Decreases with a decrease in thickness
  2.    Decreases with a decrease in temperature
  3.    Decreases with an increase in humidity
  4.    Decreases with a decrease in frequency
 Discuss Question
Answer: Option C. -> Decreases with an increase in humidity
Answer: (c).Decreases with an increase in humidity
Question 14. How is the dielectric strength denoted as?
  1.    s⁻¹
  2.    Vm⁻¹
  3.    Fm²
  4.    CV⁻¹
 Discuss Question
Answer: Option B. -> Vm⁻¹
Answer: (b).Vm⁻¹
Question 15. What is the electric polarizability of helium?
  1.    0.18 * 10⁻⁴⁰ Fm²
  2.    0.35 * 10⁻⁴⁰ Fm²
  3.    1.43 * 10⁻⁴⁰ Fm²
  4.    3.54 * 10⁻⁴⁰ Fm²
 Discuss Question
Answer: Option A. -> 0.18 * 10⁻⁴⁰ Fm²
Answer: (a).0.18 * 10⁻⁴⁰ Fm²
Question 16. Which of the following properties is not associated with refractory metals?
  1.    High fusion temperature
  2.    High heat resistance
  3.    Good Corrosion resistance
  4.    High thermal coefficient of expansion
 Discuss Question
Answer: Option D. -> High thermal coefficient of expansion
Answer: (d).High thermal coefficient of expansion
Question 17. Firebrick is an important raw material of refractory metals, which is made from ______
  1.    Brick
  2.    Concrete
  3.    Fireclay
  4.    Wood
 Discuss Question
Answer: Option C. -> Fireclay
Answer: (c).Fireclay
Question 18. What kind of refractory can bauxite be grouped as?
  1.    Acid refractory
  2.    Basic refractory
  3.    Neutral refractory
  4.    Silica refractory
 Discuss Question
Answer: Option B. -> Basic refractory
Answer: (b).Basic refractory
Question 19. What is the fusion temperature of aluminum silica?
  1.    1780°C
  2.    1900°C
  3.    2050°C
  4.    2800°C
 Discuss Question
Answer: Option A. -> 1780°C
Answer: (a).1780°C
Question 20. Silica refractories are also known as ______ refractories.
  1.    Acid
  2.    Basic
  3.    Neutral
  4.    Magnesia
 Discuss Question
Answer: Option A. -> Acid
Answer: (a).Acid

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