1. What is the reciprocal of electrical resistance called?
A.
Conductance
B.
Conductivity
C.
Resistivity
D.
Cell constant
Correct Answer:
Conductance
Explanation:
Conductance is the reciprocal of resistance and is given by G = 1/R.
2. What is the SI unit of conductance?
A.
Ohm
B.
Siemens
C.
Ohm metre
D.
Siemens metre
Correct Answer:
Siemens
Explanation:
The SI unit of conductance is siemens (S), which is equivalent to ohm⁻¹.
3. If the resistance of an electrolytic solution is 5 ohms, what is its conductance?
A.
0.2 S
B.
5 S
C.
25 S
D.
10 S
Correct Answer:
0.2 S
Explanation:
Conductance is G = 1/R = 1/5 = 0.2 S.
4. Which quantity is represented by the symbol κ in electrolytic conductance?
A.
Resistance
B.
Conductance
C.
Conductivity
D.
Molarity
Correct Answer:
Conductivity
Explanation:
The symbol κ represents conductivity, which measures the conductance of a solution of unit length and unit cross-sectional area.
5. What is the SI unit of conductivity?
A.
S cm⁻¹
B.
S m⁻¹
C.
Ω m
D.
S mol⁻¹
Correct Answer:
S m⁻¹
Explanation:
Conductivity is expressed in siemens per metre (S m⁻¹) in the SI system.
6. Conductivity of an electrolytic solution is related to conductance by which expression?
A.
κ = G A/l
B.
κ = G l/A
C.
κ = R A/l
D.
κ = G/A l
Correct Answer:
κ = G l/A
Explanation:
Conductivity is given by κ = G l/A, where G is conductance, l is the distance between electrodes, and A is electrode area.
7. What is the cell constant of a conductivity cell?
A.
A/l
B.
l/A
C.
R/G
D.
G/R
Correct Answer:
l/A
Explanation:
The cell constant is the ratio of the distance between the electrodes to their area, l/A.
8. If the distance between the electrodes is doubled while their area remains unchanged, what happens to the cell constant?
A.
It becomes half
B.
It remains unchanged
C.
It becomes double
D.
It becomes four times
Correct Answer:
It becomes double
Explanation:
Since cell constant = l/A, doubling l while keeping A constant doubles the cell constant.
9. Which instrument is commonly used to measure the resistance of an electrolytic solution?
A.
Conductivity cell
B.
Thermometer
C.
Calorimeter
D.
Barometer
Correct Answer:
Conductivity cell
Explanation:
A conductivity cell containing two electrodes is used to measure the resistance or conductance of an electrolytic solution.
10. What happens to the conductance of a solution when its resistance increases?
A.
Conductance increases
B.
Conductance decreases
C.
Conductance becomes zero always
D.
Conductance remains unchanged
Correct Answer:
Conductance decreases
Explanation:
Conductance is the reciprocal of resistance, so an increase in resistance causes a decrease in conductance.
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