Physics
Current electricity
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#1 The SI unit of electric current is
A) Coulomb
B) Ampere
C) Volt
D) Ohm
Answer: B
#2 The current density J is related to current I by
A) $I=J\cdot A$
B) $I=J/A$
C) $I=JA$
D) $I=J+A$
Answer: C
#3 The SI unit of current density is
A) A/m
B) A/m$^{2}$
C) A$^{2}$/m
D) A/m$^{3}$
Answer: B
#4 Ohm's law states that
A) V ? I
B) V = IR
C) Both A and B
D) Neither A nor B
Answer: C
#5 The SI unit of resistance is
A) Ohm
B) Volt/Ampere
C) Both A and B
D) Neither A nor B
Answer: C
#6 The SI unit of resistivity is
A) Ohm meter
B) Ohm/meter
C) Ohm/meter$^{2}$
D) Ohm meter$^{2}$
Answer: A
#7 The resistivity of a material depends on
A) Length
B) Area
C) Nature of material
D) All of these
Answer: C
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