Hi friends, these are some of the multiple choice questions on electrical and magnetic properties. These are some of the basic questions which are asked in previous competitive papers check out and comment...
l) 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
Ans:C
2) 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
Ans:C
3) 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
Ans:C
4) The resistivity of a conductor with an increase in temperature.
A) increases
B) decreases
C) remains the same
D) becomes zero
Ans:A
5) What is the SI unit of conductance?
A) Siemens
B) Mhos
C) Ohms
D) 1/Ohms
Ans:A
6) If the resistance ofa material 2 m long and 2 m"2 in area of cross-section is 1.6 ><1O“—8 Q, then its resistivity is
A) 3.2 ×10^-8 Ω-m
B) 1.6×10^-8 Ω-m
C) 0.64 ×10^-8 Ω-m
D) 0.16 × 10^-8 Ω-m
Ans:B
7) What is the SI unit of conductivity?
A) Ohms/m
B) Ohms-m
C) Siemens-m
D) Siemens/m
Ans:D
8) The temperature coefficient of resistance of conductors is
A) positive
B) zero
C) negative
D) infinite
Ans:A
9) The temperature coefficient of resistance of semiconductors is
A) positive
B) zero
C) negative
D) infinite
Ans:C
10) 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
Ans:D
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l) 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
Ans:C
2) 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
Ans:C
3) 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
Ans:C
4) The resistivity of a conductor with an increase in temperature.
A) increases
B) decreases
C) remains the same
D) becomes zero
Ans:A
5) What is the SI unit of conductance?
A) Siemens
B) Mhos
C) Ohms
D) 1/Ohms
Ans:A
6) If the resistance ofa material 2 m long and 2 m"2 in area of cross-section is 1.6 ><1O“—8 Q, then its resistivity is
A) 3.2 ×10^-8 Ω-m
B) 1.6×10^-8 Ω-m
C) 0.64 ×10^-8 Ω-m
D) 0.16 × 10^-8 Ω-m
Ans:B
7) What is the SI unit of conductivity?
A) Ohms/m
B) Ohms-m
C) Siemens-m
D) Siemens/m
Ans:D
8) The temperature coefficient of resistance of conductors is
A) positive
B) zero
C) negative
D) infinite
Ans:A
9) The temperature coefficient of resistance of semiconductors is
A) positive
B) zero
C) negative
D) infinite
Ans:C
10) 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
Ans:D
If you like my post please share it with your friends and subscribe to latest updates.. If you have doubts you can start new topic on forum and start discussion with our readers..
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