Internal Resistance, Potential Difference and EMF of a Cell, a Combination of Cells in Series and Parallel NEET Questions

Physics - Current Electricity

Internal Resistance, Potential Difference and EMF of a Cell, a Combination of Cells in Series and Parallel MCQ Questions


7.
When a cell is being charged, the terminal voltage:
A.
Is greater than EMF
B.
Equals EMF
C.
Is zero
D.
Is less than EMF
😑 View Answer Rough Work Error
ANSWER :
A. Is greater than EMF
8.
A battery of EMF 10 V and internal resistance 3 Ω is connected to a resistor R. If current is 0.5 A, then R is:
A.
17 Ω
B.
10 Ω
C.
5 Ω
D.
20 Ω
😑 View Answer Rough Work Error
ANSWER :
A. 17 Ω
9.
Two cells of EMF ε₁ and ε₂ and internal resistances r₁ and r₂ are connected in series. The equivalent EMF is:
A.
(ε₁ + ε₂)/2
B.
ε₁ + ε₂ (when same polarity)
C.
ε₁ × ε₂
D.
ε₁ − ε₂
😑 View Answer Rough Work Error
ANSWER :
B. ε₁ + ε₂ (when same polarity)
10.
Two cells of EMF ε₁ and ε₂ with internal resistances r₁ and r₂ are connected in series. The equivalent internal resistance is:
A.
|r₁ − r₂|
B.
r₁ × r₂/(r₁+r₂)
C.
(r₁ + r₂)/2
D.
r₁ + r₂
😑 View Answer Rough Work Error
ANSWER :
D. r₁ + r₂
11.
Two cells of EMF ε₁ and ε₂ and internal resistances r₁ and r₂ are connected in parallel (positive terminals together). The equivalent EMF is:
A.
ε₁ε₂/(r₁ + r₂)
B.
(ε₁r₂ + ε₂r₁)/(r₁ + r₂)
C.
ε₁ + ε₂
D.
(ε₁ + ε₂)/(r₁ + r₂)
😑 View Answer Rough Work Error
ANSWER :
B. (ε₁r₂ + ε₂r₁)/(r₁ + r₂)
12.
Two cells of EMF ε₁ and ε₂ with internal resistances r₁ and r₂ are connected in parallel. The equivalent internal resistance is:
A.
r₁ + r₂
B.
r₁r₂/(r₁ + r₂)
C.
(r₁ + r₂)/2
D.
|r₁ − r₂|
😑 View Answer Rough Work Error
ANSWER :
B. r₁r₂/(r₁ + r₂)