Explore topic-wise MCQs in Engineering Physics Questions and Answers.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

EF = (Ec+ Ev)/2, this represents the Fermi energy level of which of the following?

A. Extrinsic semiconductor
B. N-type semiconductor
C. P-type semiconductor
D. Intrinsic semiconductor
Answer» E.
Discussion
2.

The conductivity of germanium at 20°C is 2/ohm m. What is its conductivity at 40°C? Eg=0.72eV

A. 1.38×10-23/Ohm m
B. 1.0002/Ohm m
C. 293/Ohm m
D. 313/Ohm m
Answer» C. 293/Ohm m
Discussion
3.

A silicon plate of thickness 1mm, breadth 10mm and length 100mm is placed in a magnetic field of 0.5 Wb/m2 acting perpendicular to its thickness. If 10-3 A current flows along its length, calculate the Hall voltage developed, if the Hall coefficient is 3.66×104 m3/Coulomb.

A. 1.83×10-3 Volts
B. 3.66×10-4 Volts
C. 0.5 Volts
D. 25.150 Volts
Answer» B. 3.66×10-4 Volts
Discussion
4.

The intrinsic carrier density at room temperature in Ge is 2.37×1019/m3. If the electron and hole mobilities are 0.38 and 0.18 m2/Vs respectively. Calculate its resistivity.

A. 0.18ohm m
B. 0.460ohm m
C. 0.4587ohm m
D. 0.709ohm m
Answer» E.
Discussion
5.

A semiconducting crystal 12mm long, 5mm wide and 1mm thick has a magnetic flux density of 0.5Wb/m2 applied from front to back perpendicular to largest faces. When a current of 20mA flows length wise through the specimen, the voltage measured across its width is found to be 37μV. What is the Hall coefficient of this semiconductor?

A. 37×10-6 m3/C
B. 3.7×10-6 m3/C
C. 3.7×106 m3/C
D. 0
Answer» C. 3.7×106 m3/C
Discussion