A cell of emf 2 V and internal resistance 0.5 Ω is connected across an external resistance of 3.5 Ω. The terminal potential difference of the cell is:

A
2 V
B
0.25 V
C
1.75 V
D
2.25 V

Q63. AI-generated practice Single-correct MCQ Medium

A cell has emf 1.5 V and internal resistance 0.3 Ω. The current when its terminals are short-circuited by a thick wire of negligible resistance is:

A
0.45 A
B
1.5 A
C
5 A
D
0.2 A

Q64. AI-generated practice Single-correct MCQ Medium

A 12 V battery of internal resistance 0.5 Ω is being charged by a current of 2 A. The potential difference across its terminals during charging is:

A
12 V
B
13 V
C
11 V
D
14 V

Q65. AI-generated practice Single-correct MCQ Medium

n identical cells, each of emf E and internal resistance r, are connected in series across an external resistance R. The current is:

A
nE/(R + r)
B
E/(R + r/n)
C
E/(R + nr)
D
nE/(R + nr)

Q66. AI-generated practice Single-correct MCQ Medium

m identical cells, each of emf E and internal resistance r, are connected in parallel (like terminals together) across an external resistance R. The current through R is:

A
mE/(R + mr)
B
mE/(R + r/m)
C
E/(R + mr)
D
E/(R + r/m)

Q67. AI-generated practice Single-correct MCQ Hard

The terminal voltage of a cell is 2.2 V on open circuit and falls to 1.8 V when a 5 Ω resistor is connected across it. The internal resistance of the cell is about:

A
2.2 Ω
B
1.1 Ω
C
0.9 Ω
D
0.4 Ω

Q68. AI-generated practice Single-correct MCQ Hard

A cell of emf 6 V and internal resistance 2 Ω is connected to a variable external resistor. The maximum power that can be delivered to the external resistor is:

A
18 W
B
3 W
C
4.5 W
D
9 W

Q69. AI-generated practice Single-correct MCQ Easy

The emf of a cell is equal to:

A
the potential difference between its terminals when no current is drawn
B
the current it gives on short circuit
C
the potential difference between its terminals when it delivers maximum current
D
the work done per unit charge by an external agent outside the cell

Q70. AI-generated practice Single-correct MCQ Medium

A cell of emf 2 V (internal resistance 1 Ω) and a cell of emf 1.5 V (internal resistance 0.5 Ω) are connected in series with their positive terminals joined together (opposing), and this combination is connected across a 1 Ω resistor. The current is:

A
0.14 A
B
1.4 A
C
0.2 A
D
0.5 A

Q71. AI-generated practice Single-correct MCQ Hard

Two cells of emfs 2 V and 1 V, each with internal resistance 1 Ω, are connected in parallel with like terminals together. The emf and internal resistance of the equivalent single cell are:

A
1 V and 0.5 Ω
B
1.5 V and 0.5 Ω
C
1.5 V and 2 Ω
D
3 V and 2 Ω

Q72. AI-generated practice Single-correct MCQ Medium

For a cell, the graph of terminal voltage V (y-axis) against the current I drawn (x-axis) is a straight line. Its intercept on the V-axis and its slope are respectively:

A
the emf E, and −r (minus the internal resistance)
B
the internal resistance r, and E
C
zero, and −r
D
the emf E, and +r

Q73. AI-generated practice Single-correct MCQ Easy

A cell of internal resistance 0.25 Ω delivers a current of 2 A. The 'lost voltage' inside the cell is:

A
2.25 V
B
8 V
C
0.125 V
D
0.5 V

Q74. AI-generated practice Single-correct MCQ Medium

A cell of emf E and internal resistance r is connected to an external resistance R = 3r. The terminal voltage of the cell is:

A
E/4
B
E/3
C
E
D
3E/4

Q75. AI-generated practice Numerical value Easy

A cell of emf 6 V and internal resistance 1 Ω is connected across a 2 Ω resistor. Find the current in ampere.

Q76. AI-generated practice Numerical value Medium

A battery of emf 12 V and internal resistance 0.4 Ω supplies a current of 2.5 A. Find its terminal voltage in volt.

Q77. AI-generated practice Numerical value Medium

Four cells, each of emf 1.5 V and internal resistance 0.5 Ω, are connected in series across a 4 Ω resistor. Find the terminal voltage (in volt) of the battery.

Q78. AI-generated practice Numerical value Hard

A cell drives a current of 2 A through a 1 Ω resistor and a current of 1 A through a 2.5 Ω resistor. Find the emf of the cell in volt.

Q79. AI-generated practice Assertion–Reason Medium

Assertion (A): The terminal potential difference of a cell can be greater than its emf.
Reason (R): While a cell is being charged, current enters it at its positive terminal.

A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false
D
A is false but R is true

Q80. AI-generated practice Assertion–Reason Hard

Assertion (A): Maximum power is delivered by a cell to an external resistor when the external resistance equals the internal resistance.
Reason (R): The efficiency of the cell is maximum when the external resistance equals the internal resistance.

A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false
D
A is false but R is true