Electronics Engineering MCQs [Quiz 23]

Q1. If the length and area of cross-section of a wire are doubled, then its resistance
A. becomes four times
B. becomes sixteen times
C. remains the same
D. becomes two times

Q2. A length of wire has a resistance of 10 ohms. What is the resistance of a wire of the same material three times as long and twice the cross-sectional area?
A. 30 ohms
B. 20 ohms
C. 15 ohms
D. 7 ohms

Q3. What is the SI unit of specific resistance or resistivity?
A. Ohm-circular mil per inch
B. Ohm-circular mil per foot
C. Ohm-m
D. Ohm-cm

Q4. The resistivity of a conductor with an increase in temperature.
A. increases
B. decreases
C. remains the same
D. becomes zero

Q5. What is the SI unit of conductance?
A. Siemens
B. Mhos
C. Ohms
D. 1/Ohms

Q6. If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ×10^-8 fi, then its resistivity is
A. 3.2 × 10^-8 fi-m
B. 1.6 × 10^-8 fi-m
C. 0.64 × 10^-8 fi-m
D. 0.16 × 10^-8 fi-m

Q7. What is the SI unit of conductivity?
A. Ohms/m
B. Ohms-m
C. Siemens-m
D. Siemens/m

Q8. The temperature coefficient of resistance of conductors is
A. positive
B. zero
C. negative
D. infinite

Q9. The temperature coefficient of resistance of semiconductors is
A. positive
B. zero
C. negative
D. infinite

Q10. What determines the value of the temperature coefficient of resistance of a material?
A. length
B.cross-sectional area
C.volume
D.nature and temperature

Updated: 22nd July 2019 — 9:20 PM

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