Quiz: Electrical Engineering
Exam: UPSSSC JE
Topic: Miscellaneous
Each question carries 1 mark.
Negative marking: 1/4 mark
Time: 10 Minute
Q1. EMF of a thermo couple depends upon the
(a) nature of material of metal
(b) difference of temperature of two junctions
(c) both (a) and (b)
(d) none of the above
Q2. If the diameter of a copper wire is increased by two times keeping the terminal voltage same then the drift velocity will
(a) become twice
(b) become half
(c) become four time
(d) remain unchanged
Q3. According to classical free electron theory, electrons in a metal are subjected to
(a) constant potential
(b) sinusoidal potential
(c) square-wave potential
(d) non-periodic potential
Q4. In ionic crystal, electrical conductivity is
(a) very high
(b) depends on material
(c) depends upon temperature
(d) practically zero
Q5. What type of defect causes F-centers in a crystal?
(a) Stoichiometric defect
(b) Metal excess defect due to anion vacancies
(c) Metal excess defect due to extra cation
(d) Frenkel defect
Q6. In crystal lattice, what are the vacancies created by the absence of certain atoms known as
(a) Hertz defects
(b) Schottky defects
(c) Pauli defects
(d) Crystal defects
Q7. Superconducting metal in superconducting state has relative permeability of
(a) more than one
(b) one
(c) zero
(d) negative
Q8. The dc resistivity and permeability exhibited by a type 1 superconductor are respectively
(a) zero and zero
(b) zero and unity
(c) unity and zero
(d) unity and unity
Q9. What is the magnetic susceptibility χ of an ideal superconductor?
(a) 1
(b) -1
(c) 0
(d) infinite
Q10. Which effect is the converse of Peltier effect?
(a) Seebeck effect
(b) Thomson effect
(c) Hall effect
(d) joule effect
Solutions
S1. Ans. (c)
Sol. EMF of a thermo couple depends upon both factors
- nature of material of metal
- difference of temperature of two junctions
S2. Ans. (d)
Sol. It will remain unchanged
S3. Ans. (a)
Sol. constant potential
S4. Ans. (d)
Sol. In ionic crystal, electrical conductivity is practically zero.
S5. Ans. (b)
Sol. Metal excess defect due to anion vacancies
S6. Ans. (b)
Sol. Schottky defects
S7. Ans. (c)
Sol. Zero
S8. Ans. (a)
Sol. Zero and zero
S9. Ans. (b)
Sol. -1
S10. Ans. (a)
Sol. Seebeck effect
