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Q. What is the potential energy of a mass of 5 kg at a height of 10 m in a gravitational field (g = 9.8 m/s²)?

A. 490 J
B. 980 J
C. 245 J
D. 50 J

Solution

Potential energy PE = mgh = 5 kg × 9.8 m/s² × 10 m = 490 J.

Correct Answer: B — 980 J

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Q. What is the potential energy of a system of two charges +3 μC and +4 μC separated by 0.2 m? (2023)

A. -54 J
B. 54 J
C. 0 J
D. 27 J

Solution

Potential energy U = k * q1 * q2 / r = (9 × 10^9 N m²/C²) * (3 × 10^-6 C) * (4 × 10^-6 C) / 0.2 m = 54 J.

Correct Answer: B — 54 J

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Q. What is the potential energy of a system of two charges +3 µC and +4 µC separated by 0.3 m? (2023)

A. -0.12 J
B. 0.12 J
C. 0.36 J
D. 0.24 J

Solution

Potential energy U = k * q1 * q2 / r = (9 × 10^9 N m²/C²) * (3 × 10^-6 C) * (4 × 10^-6 C) / 0.3 m = 0.36 J.

Correct Answer: C — 0.36 J

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Q. What is the potential energy of a system of two charges +3μC and +4μC separated by 0.2m?

A. 0.54 J
B. 0.72 J
C. 0.36 J
D. 0.18 J

Solution

U = k * (q1 * q2) / r = (9 × 10^9) * (3 × 10^-6 * 4 × 10^-6) / 0.2 = 0.54 J.

Correct Answer: B — 0.72 J

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Q. What is the potential energy of a system of two charges +3μC and +5μC separated by 0.2m?

A. -6.75 J
B. 6.75 J
C. 0.75 J
D. -0.75 J

Solution

Potential energy U = k * (q1 * q2) / r = (9 × 10^9) * (3 × 10^-6) * (5 × 10^-6) / 0.2 = 6.75 J.

Correct Answer: B — 6.75 J

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Q. What is the potential energy of a system of two charges +3μC and -5μC separated by 0.3m?

A. -0.45 J
B. 0.45 J
C. -0.15 J
D. 0.15 J

Solution

Potential energy U = k * q1 * q2 / r = (9 × 10^9) * (3 × 10^-6) * (-5 × 10^-6) / 0.3 = -0.45 J.

Correct Answer: A — -0.45 J

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Q. What is the potential energy of a system of two charges +5μC and +10μC separated by 0.2m?

A. -0.225 J
B. 0.225 J
C. 0.45 J
D. 0.9 J

Solution

Potential energy U = k * (q1 * q2) / r = (9 × 10^9) * (5 × 10^-6) * (10 × 10^-6) / 0.2 = 0.225 J.

Correct Answer: B — 0.225 J

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Q. What is the potential energy of a system of two charges +q and +q separated by a distance r?

A. 0
B. k*q²/r
C. -k*q²/r
D. 2k*q²/r

Solution

Potential energy U = k * (q1 * q2) / r = k * (q * q) / r = k*q²/r.

Correct Answer: B — k*q²/r

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Q. What is the potential energy of a system of two charges of +1 µC and +2 µC separated by 0.1 m?

A. 180 J
B. 90 J
C. 45 J
D. 36 J

Solution

U = k * (q1 * q2) / r = (9 × 10^9) * (1 × 10^-6 * 2 × 10^-6) / 0.1 = 36 J.

Correct Answer: D — 36 J

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Q. What is the potential energy of a system of two charges of +1μC and -1μC separated by 0.1m?

A. -0.09 J
B. 0.09 J
C. -0.18 J
D. 0.18 J

Solution

Potential energy U = k * q1 * q2 / r = (9 × 10^9) * (1 × 10^-6) * (-1 × 10^-6) / 0.1 = -0.09 J.

Correct Answer: A — -0.09 J

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Q. What is the potential energy of a system of two point charges +q and -q separated by a distance r?

A. 0
B. kq²/r
C. -kq²/r
D. kq/r

Solution

The potential energy U of a system of two point charges is given by U = k(q1q2)/r = -kq²/r for +q and -q.

Correct Answer: C — -kq²/r

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Q. What is the potential energy of a system of two point charges q1 and q2 separated by a distance r?

A. k * q1 * q2 / r
B. k * q1 * q2 * r
C. k * (q1 + q2) / r
D. k * (q1 - q2) / r

Solution

The potential energy U of a system of two point charges is given by U = k * q1 * q2 / r.

Correct Answer: A — k * q1 * q2 / r

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Q. What is the potential energy of an object of mass 2 kg at a height of 10 m? (g = 9.8 m/s²) (2022)

A. 196 J
B. 98 J
C. 20 J
D. 10 J

Solution

Potential energy (PE) is calculated using the formula PE = mgh. Here, PE = 2 kg × 9.8 m/s² × 10 m = 196 J.

Correct Answer: A — 196 J

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Q. What is the potential energy of an object of mass 2 kg at a height of 5 m? (g = 10 m/s²) (2018)

A. 100 J
B. 50 J
C. 20 J
D. 10 J

Solution

Potential Energy (PE) = mgh = 2 kg × 10 m/s² × 5 m = 100 J.

Correct Answer: A — 100 J

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Q. What is the potential energy of an object of mass 2 kg at a height of 5 m? (g = 9.8 m/s²) (2019)

A. 98 J
B. 100 J
C. 90 J
D. 80 J

Solution

Potential Energy (PE) = mgh = 2 kg × 9.8 m/s² × 5 m = 98 J.

Correct Answer: A — 98 J

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Q. What is the potential energy of two charges +3 μC and +4 μC separated by 0.2 m? (2023)

A. -54 J
B. 54 J
C. 0.54 J
D. 5.4 J

Solution

Potential energy U = k * q1 * q2 / r = (9 × 10^9 N m²/C²) * (3 × 10^-6 C) * (4 × 10^-6 C) / 0.2 m = 54 J.

Correct Answer: B — 54 J

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Q. What is the potential energy stored in a capacitor of capacitance C charged to a voltage V? (2021)

A. CV
B. 1/2 CV^2
C. 1/2 QV
D. QV

Solution

The potential energy (U) stored in a capacitor is given by U = 1/2 CV^2.

Correct Answer: B — 1/2 CV^2

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Q. What is the potential energy stored in a capacitor? (2022)

A. 1/2 CV²
B. CV
C. 1/2 QV
D. QV

Solution

The potential energy (U) stored in a capacitor is given by the formula U = 1/2 CV², where C is the capacitance and V is the voltage across the capacitor.

Correct Answer: A — 1/2 CV²

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Q. What is the potential energy stored in a spring when it is compressed by a distance x?

A. 1/2 kx
B. 1/2 kx²
C. kx
D. kx²

Solution

The potential energy (PE) stored in a spring is given by PE = 1/2 kx², where k is the spring constant and x is the displacement.

Correct Answer: B — 1/2 kx²

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Q. What is the power consumed by a 10 ohm resistor when a current of 2 A flows through it?

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

Solution

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

Correct Answer: B — 40 W

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Q. What is the power consumed by a 10 ohm resistor when a current of 3 A flows through it?

A. 30 W
B. 90 W
C. 60 W
D. 15 W

Solution

Power P = I^2 * R = (3 A)^2 * 10 ohms = 9 * 10 = 90 W.

Correct Answer: B — 90 W

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Q. What is the power consumed by a 100Ω resistor when a current of 0.5A flows through it? (2020)

A. 25W
B. 50W
C. 100W
D. 12.5W

Solution

Power (P) is given by P = I^2R = (0.5A)^2 * 100Ω = 0.25 * 100 = 25W.

Correct Answer: A — 25W

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Q. What is the power consumed by a 10Ω resistor when a current of 2A flows through it?

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

Solution

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

Correct Answer: A — 20W

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Q. What is the power consumed by a 10Ω resistor when a current of 3A flows through it? (2021)

A. 90W
B. 30W
C. 60W
D. 45W

Solution

Power P = I^2 * R = (3A)^2 * 10Ω = 9 * 10 = 90W.

Correct Answer: A — 90W

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Q. What is the power consumed by a 12 V battery supplying a current of 2 A?

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

Solution

Power is given by P = V * I = 12 V * 2 A = 24 W.

Correct Answer: A — 24 W

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Q. What is the power consumed by a 5 ohm resistor carrying a current of 3 A?

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

Solution

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

Correct Answer: A — 15 W

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Q. What is the power consumed by a 5 ohm resistor when a current of 2A flows through it?

A. 10W
B. 20W
C. 5W
D. 15W

Solution

Power P = I^2 * R = (2A)^2 * 5 ohms = 4 * 5 = 20W.

Correct Answer: B — 20W

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Q. What is the power consumed by a 5 ohm resistor when a current of 3 A flows through it?

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

Solution

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

Correct Answer: A — 15 W

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Q. What is the power consumed by a 6Ω resistor when a current of 2A flows through it? (2023)

A. 12W
B. 24W
C. 6W
D. 8W

Solution

Power (P) is given by P = I²R = (2A)² * 6Ω = 4 * 6 = 24W.

Correct Answer: A — 12W

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Q. What is the power consumed by a 6Ω resistor when a current of 3A flows through it? (2021)

A. 18W
B. 9W
C. 36W
D. 12W

Solution

Power (P) is given by P = I^2 * R = (3A)^2 * 6Ω = 9 * 6 = 54W.

Correct Answer: A — 18W

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Major Competitive Exams

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