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.
Three cells of emf 2V each and internal resistance 1Ω are connected in series. The total emf of the battery is:

NEET - 2017

A.
2V
B.
4V
C.
6V
D.
8V
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ANSWER :
C. 6V
8.
If a battery has EMF E and internal resistance r, what is the terminal voltage when drawing current I?
A.
V = E + Ir
B.
V = E - Ir
C.
V = I/R
D.
V = I(R+r)
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ANSWER :
B. V = E - Ir
9.
Two identical cells connected in series have an equivalent EMF of:
A.
2E
B.
E
C.
3E
D.
E/2
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ANSWER :
A. 2E
10.
A battery is connected to a resistor. The current is 5A and the terminal voltage is 10V. If the internal resistance of the battery is 0.5Ω, its emf is:

NEET - 2020

A.
12V
B.
10V
C.
11V
D.
10.5V
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ANSWER :
C. 11V
11.
When two identical cells are connected in parallel, the total EMF is:
A.
Same as one cell
B.
Twice one cell
C.
Half of one cell
D.
Four times one cell
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ANSWER :
A. Same as one cell
12.
The internal resistance of a cell increases if:

NEET - 2021

A.
The temperature is increased
B.
The electrolyte concentration is increased
C.
The electrode area is increased
D.
The electrolyte level decreases
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ANSWER :
D. The electrolyte level decreases