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WorksheetsQuiz on Resistivity and Conductivity
Total questions: 25
Worksheet time: 13mins
What is the SI unit of electrical resistance?
Ampere (A)
Volt (V)
Siemens (S)
Ohm (Ω)
What does electrical resistivity measure?
The flow of electric current
The temperature of a conductor
The resistance to electric current
The speed of electrons
Which of the following is the formula for electrical resistance?
R=ρA/L
R=σL/A
R=σA/L
R=ρL/A
What happens to resistivity as temperature increases for most materials?
It increases
It remains constant
It decreases
It fluctuates
What is the relationship between conductivity and resistivity?
Conductivity is the square of resistivity
Conductivity is equal to resistivity
Conductivity is half of resistivity
Conductivity is the inverse of resistivity
What is the SI unit of electrical conductivity?
Siemens per meter (S/m)
Ohm-meter (Ω m)
Ampere (A)
Ohm (Ω)
What is the temperature coefficient of resistivity generally of the order of?
10−4
10−3
10−2
10−1
What phenomenon occurs in superconductors at very low temperatures?
Increased resistance
Zero resistivity
Decreased conductivity
Increased resistivity
What is the critical temperature for mercury to become a superconductor?
0 K
273 K
4.2 K
100 K
What is the formula for calculating resistivity at a given temperature?
ρ = ρ0(1 + α(T - T0))
ρ = ρ0(1 - α(T - T0))
ρ = ρ0 + α(T - T0)
ρ = ρ0 - α(T - T0)
What is the effect of a paddle wheel on the flow of water analogous to?
Electrical resistance
Electrical conductivity
Resistivity
Temperature coefficient
What is the primary use of superconductors in medical settings?
Ultrasound machines
Magnetic resonance imaging (MRI)
CT scanners
X-ray machines
What happens to the resistivity of nickel when heated from 293 K to 343 K?
It becomes zero
It decreases significantly
It increases moderately
It remains unchanged
What is the relationship between the length of a conductor and its electrical resistance?
Longer conductors have lower resistance
Length has no effect on resistance
Longer conductors have higher resistance
Resistance is independent of length
What is the primary reason for the increase in resistivity with temperature?
Decreased atomic vibrations
Decreased resistance
Increased electron flow
Increased atomic vibrations
What is the formula for electrical conductivity?
σ = ρL/A
σ = 1/ρ
σ = ρ^2
σ = R/A
What is the effect of temperature on the resistivity of semiconductors?
It fluctuates with temperature
It remains constant
It decreases with temperature
It increases with temperature
What is the primary characteristic of superconductors?
They have high conductivity
They have variable resistivity
They have zero resistivity
They have high resistivity
What is the impact of a higher temperature coefficient of resistivity?
Constant resistivity
Less change with temperature
More change with temperature
No change with temperature
What is the effect of impurities on the resistivity of a material?
It has no effect
It makes resistivity variable
It increases resistivity
It decreases resistivity
How does the resistivity of a superconductor change as it approaches its critical temperature?
It fluctuates
It decreases
It increases
It remains constant
What is the primary reason for using superconductors in power transmission?
To increase resistivity
To improve electrical resistance
To reduce energy loss
To enhance thermal conductivity
What is the effect of temperature on the conductivity of metals?
It fluctuates with temperature
It remains constant
It decreases with temperature
It increases with temperature
What is the primary reason for using materials with low resistivity in electrical wiring?
To improve mechanical strength
To enhance insulation
To increase heat generation
To reduce energy loss
What happens to the resistivity of a superconductor when it is above its critical temperature?
It remains unchanged
It decreases
It becomes zero
It increases significantly
