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MCQs

Total Questions : 330 | Page 18 of 33 pages
Question 171. What happens to absolute permittivity when relative permittivity increases?
  1.    Increases
  2.    Decreases
  3.    Remains the same
  4.    Becomes zero
 Discuss Question
Answer: Option C. -> Remains the same
Answer: (c).Remains the same
Question 172. What is the unit for relative permittivity?
  1.    F/m
  2.    Fm
  3.    F/m²
  4.    No unit
 Discuss Question
Answer: Option D. -> No unit
Answer: (d).No unit
Question 173. Which, among the following, will be unity in free space?
  1.    Absolute permittivity
  2.    Relative permittivity
  3.    Actual permittivity
  4.    Both absolute and relative permittivity
 Discuss Question
Answer: Option B. -> Relative permittivity
Answer: (b).Relative permittivity
Question 174. What happens to the capacitance of a multi plate capacitor when the area of cross section of the plate decreases?
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    Becomes zero
 Discuss Question
Answer: Option B. -> Decreases
Answer: (b).Decreases
Question 175. Which is the correct expression for capacitance of a multi plate capacitor?
  1.    C=absolute permittivity*A/d
  2.    C=Actual permittivity*(n-1)*A/d
  3.    C=Actual permittivity*(n)*A/d
  4.    Actual permittivity*(n+1)*A/d
 Discuss Question
Answer: Option B. -> C=Actual permittivity*(n-1)*A/d
Answer: (b).C=Actual permittivity*(n-1)*A/d
Question 176. Which, among the following, do not have any unit?
  1.    Absolute permittivity
  2.    Relative permittivity
  3.    Actual permittivity
  4.    Both absolute and relative permittivity
 Discuss Question
Answer: Option B. -> Relative permittivity
Answer: (b).Relative permittivity
Question 177. What happens to the capacitance of a multi plate capacitor when the distance of separation between the plate increases?
  1.    Increases
  2.    Decreases
  3.    Remains constant
  4.    Becomes zero
 Discuss Question
Answer: Option B. -> Decreases
Answer: (b).Decreases
Question 178. Calculate the area of cross section of the multi plate capacitor having C=20F, actual permittivity=5F/m n=3 and d=2m.
  1.    1m²
  2.    2m²
  3.    3m²
  4.    4m²
 Discuss Question
Answer: Option D. -> 4m²
Answer: (d).4m²
Question 179. The electric field strength is 10N/C and the thickness of the dielectric is 3m. Calculate the potential drop in the dielectric.
  1.    10V
  2.    20V
  3.    30V
  4.    40V
 Discuss Question
Answer: Option C. -> 30V
Answer: (c).30V
Question 180. Calculate the number of plates in the multi plate capacitor having C=1.77*10¯¹⁰F relative permittivity=5, A=4m² and d=2m.
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option C. -> 3
Answer: (c).3

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