MCQOPTIONS

Explore topic-wise MCQs in Engineering Physics.

This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.

1.	Which of the following shows the voltage-current relation before the breakdown?
A.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10a.png"><img alt="The following shows the voltage-current relation before the breakdown - option a" class="alignnone size-full wp-image-252087" height="495" sizes="(max-width: 590px) 100vw, 590px" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10a.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10a.png 590w, https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10a-300x252.png 300w" width="590"/></a>
B.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10b.png"><img alt="The following shows the voltage-current relation before the breakdown - option b" class="alignnone size-full wp-image-252088" height="501" sizes="(max-width: 587px) 100vw, 587px" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10b.png 587w, https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10b-300x256.png 300w" width="587"/></a>
C.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10c.png"><img alt="The following shows the voltage-current relation before the breakdown - option c" class="alignnone size-full wp-image-252089" height="505" sizes="(max-width: 587px) 100vw, 587px" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10c.png 587w, https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10c-300x258.png 300w" width="587"/></a>
D.	<a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10d.png"><img alt="The following shows the voltage-current relation before the breakdown - option d" class="alignnone size-full wp-image-252090" height="505" sizes="(max-width: 589px) 100vw, 589px" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10d.png 589w, https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-dielectric-breakdown-q10d-300x257.png 300w" width="589"/></a>
Answer» E.

2.	The most common mode of breakdown in ceramic insulators is _____________
A.	Defect Breakdown
B.	Thermal Breakdown
C.	Intrinsic Breakdown
D.	Electrochemical Breakdown
Answer» C. Intrinsic Breakdown

3.	The process of breakdown is accelerated by the presence of ____________
A.	Impurities
B.	Conduction
C.	Humidity
D.	Magnetic Field
Answer» B. Conduction

4.	The presence of porosity in dielectrics is detrimental for higher dielectric strength.
A.	True
B.	False
Answer» B. False

5.	In which type of breakdown, an avalanche of electrons is formed?
A.	Defect Breakdown
B.	Thermal Breakdown
C.	Intrinsic Breakdown
D.	Electrochemical Breakdown
Answer» D. Electrochemical Breakdown

6.	Dielectric breakdown occurs in gases due to ____________
A.	Corona Discharge
B.	Dielectric heating
C.	Intrinsic breakdown
D.	Defect breakdown
Answer» B. Dielectric heating

7.	Beyond breakdown voltage, dielectrics become insulating.
A.	True
B.	False
Answer» C.

8.	Mica has a dielectric strength of _____________
A.	50 X 10<sup>6</sup> V/m
B.	100 X 10<sup>6</sup> V/m
C.	150 X 10<sup>6</sup> V/m
D.	200 X 10<sup>6</sup> V/m
Answer» C. 150 X 10<sup>6</sup> V/m

9.	Which of the following is the correct expression for the dielectric strength?
A.	d/V<sub>b</sub>
B.	V<sub>b</sub>/d
C.	V<sub>b</sub>d
D.	V<sub>b</sub>/d<sup>2</sup>
Answer» C. V<sub>b</sub>d