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Q. What is the power consumed by a device that operates at 12 volts and draws a current of 2 amperes? (2020)

A. 24 W
B. 12 W
C. 6 W
D. 48 W

Solution

Power (P) is given by P = V * I. Thus, P = 12 V * 2 A = 24 W.

Correct Answer: A — 24 W

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Q. What is the power consumed by a device that operates at 120 V and draws a current of 2 A?

A. 240 W
B. 60 W
C. 120 W
D. 30 W

Solution

Power (P) is calculated using the formula P = V * I. Therefore, P = 120 V * 2 A = 240 W.

Correct Answer: A — 240 W

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Q. What is the power consumed by a device that operates at 120 volts and draws a current of 3 amperes?

A. 360 W
B. 40 W
C. 120 W
D. 240 W

Solution

Power P is calculated using P = V * I. Therefore, P = 120 V * 3 A = 360 W.

Correct Answer: A — 360 W

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Q. What is the power consumed by a device that operates at 120V and draws a current of 3A? (2021)

A. 360 W
B. 240 W
C. 120 W
D. 30 W

Solution

Power (P) = Voltage (V) × Current (I) = 120V × 3A = 360W.

Correct Answer: A — 360 W

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Q. What is the power consumed by a device that operates at a voltage of 120 volts and draws a current of 3 amperes?

A. 360 watts
B. 40 watts
C. 120 watts
D. 240 watts

Solution

Power (P) is calculated as P = V * I. Thus, P = 120 V * 3 A = 360 W.

Correct Answer: A — 360 watts

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Q. What is the power consumed by a resistor of 10 ohms carrying a current of 2 A? (2023)

A. 20 W
B. 40 W
C. 10 W
D. 5 W

Solution

Power P = I^2 * R = (2 A)^2 * 10 Ω = 4 * 10 = 40 W.

Correct Answer: A — 20 W

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Q. What is the power consumed in an AC circuit with a voltage of 230V and a current of 5A with a power factor of 0.8? (2023)

A. 920W
B. 1150W
C. 115W
D. 460W

Solution

Power = V × I × Power Factor = 230V × 5A × 0.8 = 920W.

Correct Answer: A — 920W

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Q. What is the power dissipated in a 10Ω resistor carrying a current of 2A?

A. 20W
B. 30W
C. 40W
D. 50W

Solution

Power P = I^2 * R = (2A)^2 * 10Ω = 4 * 10 = 40W.

Correct Answer: A — 20W

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Q. What is the power dissipated in a 4 ohm resistor carrying a current of 3 A?

A. 12 W
B. 9 W
C. 6 W
D. 3 W

Solution

Using the power formula P = I^2 * R, we have P = (3 A)^2 * 4 ohms = 9 * 4 = 36 W.

Correct Answer: A — 12 W

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Q. What is the power dissipated in a resistor of 10 ohms carrying a current of 2 A?

A. 20 W
B. 10 W
C. 5 W
D. 40 W

Solution

Using the power formula P = I^2 * R, we have P = (2 A)^2 * 10 ohms = 4 * 10 = 40 W.

Correct Answer: A — 20 W

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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 2A?

A. 5W
B. 10W
C. 20W
D. 40W

Solution

Power is given by P = I^2 * R = (2A)^2 * 5Ω = 4A^2 * 5Ω = 20W.

Correct Answer: B — 10W

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Q. What is the power dissipated in a resistor of 5Ω carrying a current of 3A?

A. 15W
B. 9W
C. 5W
D. 3W

Solution

Power P = I^2 * R = (3A)^2 * 5Ω = 9A^2 * 5Ω = 45W.

Correct Answer: A — 15W

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Q. What is the power dissipated in a resistor of 8Ω when a current of 2A flows through it?

A. 4W
B. 8W
C. 16W
D. 32W

Solution

Power P = I^2 * R = (2A)^2 * 8Ω = 4A^2 * 8Ω = 32W.

Correct Answer: C — 16W

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Q. What is the power factor in a circuit with a phase angle of 60 degrees?

A. 0.5
B. 0.866
C. 1
D. 0

Solution

The power factor is cos(60°) = 0.5.

Correct Answer: B — 0.866

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Q. What is the power factor in a circuit with a resistance of 5 ohms and a reactance of 5 ohms? (2022)

A. 0
B. 0.5
C. 1
D. √2/2

Solution

Power factor = R/Z = 5/√(5² + 5²) = 5/√50 = √2/2.

Correct Answer: D — √2/2

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Q. What is the power factor in an AC circuit with a phase angle of 30 degrees? (2022)

A. 0.5
B. 0.866
C. 1
D. 0.707

Solution

The power factor is cos(30°) = √3/2 ≈ 0.866.

Correct Answer: B — 0.866

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Q. What is the power factor of a circuit with a phase angle of 60 degrees?

A. 0.5
B. 0.866
C. 1
D. 0.707

Solution

The power factor (PF) is given by cos(θ). For a phase angle of 60 degrees, PF = cos(60°) = 0.5.

Correct Answer: B — 0.866

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Q. What is the power factor of a circuit with a resistance of 30Ω and a reactance of 40Ω? (2023)

A. 0.6
B. 0.75
C. 0.8
D. 1.0

Solution

Power factor = R/Z where Z = √(R² + X²). Calculate.

Correct Answer: A — 0.6

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Q. What is the power factor of a circuit with a resistance of 4Ω and a reactance of 3Ω? (2021)

A. 0.6
B. 0.8
C. 1.0
D. 0.75

Solution

Power factor = R/Z = R/√(R² + X²) = 4/√(4² + 3²) = 4/5 = 0.8.

Correct Answer: A — 0.6

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Q. What is the power factor of a circuit with a resistance of 5 ohms and a reactance of 5 ohms? (2022)

A. 0
B. 0.5
C. 1
D. √2/2

Solution

Power factor = R/Z = 5/√(5² + 5²) = 5/√50 = √2/2.

Correct Answer: D — √2/2

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Q. What is the power factor of a circuit with a resistance of 5Ω and an inductive reactance of 5Ω? (2022)

A. 0.5
B. 0.707
C. 1
D. 0

Solution

Power factor = R/Z = 5 / √(5² + 5²) = 5 / √50 = 0.707.

Correct Answer: B — 0.707

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Q. What is the power factor of a circuit with a resistance of 6Ω and a reactance of 8Ω? (2022)

A. 0.75
B. 0.8
C. 0.6
D. 1.0

Solution

Power factor = R/Z = R/√(R² + X²) = 6/√(6² + 8²) = 6/10 = 0.6.

Correct Answer: B — 0.8

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Q. What is the power factor of a circuit with a resistance of 8Ω and a reactance of 6Ω? (2023)

A. 0.5
B. 0.6
C. 0.8
D. 1.0

Solution

Power factor = R/Z, where Z = √(R² + X²) = √(8² + 6²) = 10. Thus, PF = 8/10 = 0.8.

Correct Answer: C — 0.8

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Q. What is the power factor of an AC circuit with a phase angle of 60 degrees?

A. 0.5
B. 0.866
C. 1
D. 0.707

Solution

The power factor (PF) is given by cos(θ). For a phase angle of 60 degrees, PF = cos(60°) = 0.5.

Correct Answer: B — 0.866

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Q. What is the power factor of an AC circuit with a phase angle of 60°? (2022)

A. 0.5
B. 0.866
C. 1
D. 0.707

Solution

The power factor is cos(60°) = 0.5.

Correct Answer: B — 0.866

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Q. What is the power of a lens with a focal length of 50 cm?

A. +2 D
B. +1 D
C. -2 D
D. -1 D

Solution

Power (P) is given by P = 1/f (in meters). Thus, f = 50 cm = 0.5 m, so P = 1/0.5 = +2 D.

Correct Answer: A — +2 D

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Q. What is the power output of a motor that does 1200 J of work in 30 seconds?

A. 20 W
B. 40 W
C. 60 W
D. 80 W

Solution

Power = Work / Time = 1200 J / 30 s = 40 W.

Correct Answer: C — 60 W

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Q. What is the power output of a motor that does 3000 J of work in 15 seconds?

A. 200 W
B. 300 W
C. 400 W
D. 500 W

Solution

Power = Work / Time = 3000 J / 15 s = 200 W.

Correct Answer: B — 300 W

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Q. What is the power set of A = {a, b}?

A. {∅, {a}, {b}, {a, b}}
B. {a, b}
C. {∅, {a, b}}
D. {a, b, {a, b}}

Solution

The power set of a set is the set of all its subsets. For A = {a, b}, the power set is {∅, {a}, {b}, {a, b}}.

Correct Answer: A — {∅, {a}, {b}, {a, b}}

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Q. What is the power set of the empty set ∅?

A. {∅}
B. {∅, {∅}}
C. ∅
D. {∅, ∅}

Solution

The power set of the empty set contains only the empty set itself: {∅}.

Correct Answer: A — {∅}

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Major Competitive Exams

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