Major Competitive Exams
Q. What is the total current flowing through a circuit if the total voltage is 24V and the total resistance is 6Ω?
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Solution
Using Ohm's Law, I = V/R = 24V / 6Ω = 4A.
Correct Answer: B — 4A
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Q. What is the total current flowing through a circuit with a 10V battery and two 5Ω resistors in parallel?
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Solution
Equivalent resistance R_eq = 1/(1/5 + 1/5) = 2.5Ω. Total current I = V/R_eq = 10V/2.5Ω = 4A.
Correct Answer: B — 2A
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Q. What is the total current flowing through a circuit with a 10V battery and two 5Ω resistors in series?
A.
0.5A
B.
1A
C.
2A
D.
5A
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Solution
Total resistance R = R1 + R2 = 5Ω + 5Ω = 10Ω. Using Ohm's law, I = V/R = 10V/10Ω = 1A.
Correct Answer: B — 1A
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Q. What is the total current flowing through a circuit with a 9V battery and a total resistance of 3Ω? (2022)
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Solution
Using Ohm's law, I = V/R = 9V / 3Ω = 3A.
Correct Answer: B — 2A
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Q. What is the total current flowing through a junction where 5A enters and 3A and 2A leave?
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Solution
According to Kirchhoff's Current Law, the total current entering a junction equals the total current leaving. Here, 5A = 3A + 2A.
Correct Answer: A — 0A
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Q. What is the total current in a circuit with a 10V battery and two 5 ohm resistors in parallel?
A.
1 A
B.
2 A
C.
3 A
D.
4 A
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Solution
Equivalent resistance R_eq = 1/(1/5 + 1/5) = 2.5 ohms. Total current I = V/R_eq = 10V / 2.5Ω = 4 A.
Correct Answer: B — 2 A
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Q. What is the total current in a circuit with a 12V battery and a total resistance of 3 ohms?
A.
4 A
B.
2 A
C.
3 A
D.
1 A
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Solution
Using Ohm's law, I = V/R, we have I = 12V / 3 ohms = 4 A.
Correct Answer: A — 4 A
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Q. What is the total current in a circuit with a 12V battery and three 4 ohm resistors connected in series?
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Solution
Total resistance R_total = 4 + 4 + 4 = 12 ohms. Current I = V/R_total = 12V / 12 ohms = 1A.
Correct Answer: B — 2A
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Q. What is the total current in a circuit with a 12V battery and three resistors (R1 = 4Ω, R2 = 4Ω, R3 = 4Ω) connected in parallel?
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Solution
Total resistance R_eq = 1 / (1/R1 + 1/R2 + 1/R3) = 1 / (1/4 + 1/4 + 1/4) = 1.33Ω. Current I = V / R_eq = 12V / 1.33Ω ≈ 9A.
Correct Answer: B — 4A
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Q. What is the total current in a circuit with a 12V battery and two 4 ohm resistors in series?
A.
1 A
B.
2 A
C.
3 A
D.
4 A
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Solution
Total resistance R = R1 + R2 = 4 + 4 = 8 ohms. Current I = V/R = 12V / 8 ohms = 1.5 A.
Correct Answer: B — 2 A
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Q. What is the total current in a circuit with a 12V battery and two 6Ω resistors in series? (2021)
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Solution
Total resistance R = 6 + 6 = 12Ω. Current I = V/R = 12V/12Ω = 1A.
Correct Answer: B — 2A
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Q. What is the total current in a circuit with a 15V battery and two 5Ω resistors in series? (2023)
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Solution
Total resistance R = 5Ω + 5Ω = 10Ω; I = V/R = 15V / 10Ω = 1.5A.
Correct Answer: B — 2A
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Q. What is the total current in a circuit with a 24V battery and three resistors (2Ω, 4Ω, and 6Ω) connected in series?
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Solution
Total resistance R = R1 + R2 + R3 = 2Ω + 4Ω + 6Ω = 12Ω. Using Ohm's law, I = V/R = 24V / 12Ω = 2A.
Correct Answer: B — 3A
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Q. What is the total current in a circuit with a 9V battery and a 3Ω resistor?
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Solution
Using Ohm's law, I = V/R = 9V/3Ω = 3A.
Correct Answer: B — 2A
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Q. What is the total current in a circuit with a 9V battery and two 3Ω resistors in parallel?
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Solution
Total resistance R = 1/(1/3 + 1/3) = 1.5Ω; I = V/R = 9V/1.5Ω = 6A.
Correct Answer: B — 2A
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Q. What is the total current in a circuit with a 9V battery and two 3Ω resistors in series? (2021)
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Solution
Total resistance R = 3Ω + 3Ω = 6Ω. Current I = V/R = 9V/6Ω = 1.5A.
Correct Answer: A — 1A
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Q. What is the total current in a circuit with a voltage of 240V, resistance of 20 ohms, and inductive reactance of 30 ohms? (2022)
A.
8 A
B.
6 A
C.
4 A
D.
10 A
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Solution
Z = √(R² + Xl²) = √(20² + 30²) = √(400 + 900) = √1300 = 36.06 ohms. I = V/Z = 240/36.06 = 6.66 A.
Correct Answer: B — 6 A
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Q. What is the total current in a circuit with two branches, one carrying 2 A and the other 3 A?
A.
5 A
B.
6 A
C.
1 A
D.
0 A
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Solution
In a parallel circuit, the total current is the sum of the currents in each branch: I_total = I1 + I2 = 2 A + 3 A = 5 A.
Correct Answer: A — 5 A
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Q. What is the total current in a circuit with two branches, one carrying 3A and the other 5A? (2021)
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Solution
In parallel circuits, the total current is the sum of the currents in each branch: 3A + 5A = 8A.
Correct Answer: D — 8A
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Q. What is the total current in a parallel circuit with two branches carrying 3A and 5A? (2020)
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Solution
In a parallel circuit, the total current (I_total) is the sum of the currents in each branch: I_total = 3A + 5A = 8A.
Correct Answer: A — 8A
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Q. What is the total current in a parallel circuit with two branches, one with 5A and the other with 3A? (2022)
A.
8A
B.
15A
C.
2.5A
D.
5A
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Solution
Total current in parallel = I1 + I2 = 5A + 3A = 8A.
Correct Answer: A — 8A
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Q. What is the total current in a series circuit with a 10Ω resistor and a 20Ω inductor connected to a 100V AC source at 50Hz? (2023)
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Solution
Total impedance Z = √(R² + (ωL)²) = √(10² + (2π(50)(20))²). Calculate to find current.
Correct Answer: B — 4A
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Q. What is the total electric flux through a closed surface surrounding a charge of -3Q?
A.
-3Q/ε₀
B.
3Q/ε₀
C.
0
D.
-Q/ε₀
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Solution
The total electric flux through a closed surface is given by Φ = Q_enc/ε₀, where Q_enc is the enclosed charge.
Correct Answer: A — -3Q/ε₀
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Q. What is the total energy stored in an inductor with inductance L carrying a current I?
A.
LI^2
B.
0.5LI^2
C.
I^2/L
D.
0.5I^2/L
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Solution
The energy stored in an inductor is given by U = 0.5LI^2.
Correct Answer: B — 0.5LI^2
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Q. What is the total mechanical energy of a simple harmonic oscillator at maximum displacement? (2022)
A.
Zero
B.
Maximum
C.
Minimum
D.
Constant
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Solution
At maximum displacement, the total mechanical energy of a simple harmonic oscillator is at its maximum, as all energy is potential.
Correct Answer: B — Maximum
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Q. What is the total mechanical energy of a system at the highest point of a projectile's trajectory?
A.
Maximum potential energy
B.
Maximum kinetic energy
C.
Zero energy
D.
Constant energy
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Solution
At the highest point of a projectile's trajectory, the kinetic energy is minimum (zero at the peak) and potential energy is maximum, thus total mechanical energy is maximum potential energy.
Correct Answer: A — Maximum potential energy
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Q. What is the total number of atoms in 1 mole of CO2?
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Solution
1 mole of CO2 contains 1 carbon atom and 2 oxygen atoms, totaling 3 atoms.
Correct Answer: C — 3
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Q. What is the total number of atoms in one molecule of C2H5OH?
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Solution
C2H5OH has 2 carbon, 6 hydrogen, and 1 oxygen atom, totaling 7 atoms.
Correct Answer: A — 7
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Q. What is the total number of atoms in one molecule of C4H10?
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Solution
C4H10 has 4 carbon atoms and 10 hydrogen atoms, totaling 14 atoms.
Correct Answer: C — 14
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Q. What is the total number of degrees in a triangle formed by the intersection of the medians of a triangle? (2021)
A.
90 degrees
B.
180 degrees
C.
270 degrees
D.
360 degrees
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Solution
The sum of the angles in any triangle is always 180 degrees.
Correct Answer: B — 180 degrees
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