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Q. What is the Poisson's ratio for a material if a longitudinal strain of 0.02 results in a lateral strain of 0.008? (2022)

A. 0.4
B. 0.5
C. 0.6
D. 0.7

Solution

Poisson's ratio (ν) = -lateral strain / longitudinal strain = -0.008 / 0.02 = 0.4.

Correct Answer: A — 0.4

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Q. What is the Poisson's ratio for a material that experiences a lateral strain of 0.02 when subjected to a longitudinal strain of 0.01? (2023)

A. 0.5
B. 2
C. 1
D. 0.25

Solution

Poisson's ratio (ν) = Lateral strain / Longitudinal strain = 0.02 / 0.01 = 2.

Correct Answer: A — 0.5

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Q. What is the Poisson's ratio for a material that experiences a lateral strain of 0.005 when subjected to a longitudinal strain of 0.01? (2021)

A. 0.5
B. 1
C. 0.25
D. 0.75

Solution

Poisson's ratio (ν) = -lateral strain / longitudinal strain = -0.005 / 0.01 = 0.5.

Correct Answer: A — 0.5

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Q. What is the potential at a distance of 1 m from a dipole with a dipole moment of 2 × 10^-9 C·m?

A. 0 V
B. 1 V
C. 2 V
D. 4 V

Solution

Potential due to a dipole V = (1/4πε₀) * (p * cosθ) / r². At 1 m, it is negligible.

Correct Answer: A — 0 V

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Q. What is the potential difference across a 10 ohm resistor carrying a current of 2A?

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

Solution

Using Ohm's law, V = I * R = 2A * 10 ohms = 20V.

Correct Answer: D — 20V

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Q. What is the potential difference across a 10-ohm resistor carrying a current of 3 A?

A. 30 V
B. 10 V
C. 3 V
D. 0.3 V

Solution

Using Ohm's Law (V = I * R), V = 3 A * 10 Ω = 30 V.

Correct Answer: A — 30 V

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Q. What is the potential difference across a 10Ω resistor if a current of 2A flows through it?

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

Solution

Using Ohm's Law, V = I * R = 2A * 10Ω = 20V.

Correct Answer: C — 20V

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Q. What is the potential difference across a 10Ω resistor if a current of 4A flows through it?

A. 20V
B. 40V
C. 10V
D. 30V

Solution

Using Ohm's Law, V = I * R = 4A * 10Ω = 40V.

Correct Answer: A — 20V

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Q. What is the potential difference across a 5 Ω resistor carrying a current of 2 A?

A. 10 V
B. 5 V
C. 2 V
D. 0 V

Solution

Using Ohm's law, V = I * R = 2 A * 5 Ω = 10 V.

Correct Answer: A — 10 V

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Q. What is the potential difference across a 5Ω resistor carrying a current of 2A? (2023)

A. 10V
B. 5V
C. 2V
D. 1V

Solution

Using Ohm's law, V = IR = 2A * 5Ω = 10V.

Correct Answer: A — 10V

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Q. What is the potential difference across the galvanometer in a balanced Wheatstone bridge?

A. Zero
B. Equal to the supply voltage
C. Depends on the resistances
D. Half of the supply voltage

Solution

In a balanced Wheatstone bridge, the potential difference across the galvanometer is zero, indicating no current flows through it.

Correct Answer: A — Zero

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Q. What is the potential difference between two points A and B if the electric field is uniform and equal to 50 N/C, and the distance between A and B is 2m?

A. 100 V
B. 50 V
C. 25 V
D. 0 V

Solution

Potential difference V = E * d = 50 N/C * 2 m = 100 V.

Correct Answer: A — 100 V

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Q. What is the potential difference between two points A and B if the electric field is 5 N/C and the distance between them is 3 m?

A. 15 V
B. 5 V
C. 3 V
D. 0 V

Solution

Potential difference V = E * d = 5 N/C * 3 m = 15 V.

Correct Answer: A — 15 V

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Q. What is the potential difference between two points A and B in an electric field if the work done in moving a charge of 5μC from A to B is 0.02 J?

A. 4 V
B. 2 V
C. 10 V
D. 0.1 V

Solution

Potential difference V = W/Q = 0.02 J / (5 × 10^-6 C) = 4000 V = 4 V.

Correct Answer: A — 4 V

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Q. What is the potential difference between two points A and B in an electric field of 200 N/C if the distance between them is 0.5 m?

A. 100 V
B. 200 V
C. 50 V
D. 25 V

Solution

Potential difference V = E * d = 200 N/C * 0.5 m = 100 V.

Correct Answer: A — 100 V

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Q. What is the potential difference between two points A and B in an electric field if the work done in moving a charge of 5μC from A to B is 10mJ?

A. 2V
B. 5V
C. 10V
D. 20V

Solution

Potential difference V = W/Q = 10mJ / 5μC = 10 × 10^-3 J / 5 × 10^-6 C = 2V.

Correct Answer: B — 5V

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Q. What is the potential difference between two points A and B in an electric field if the work done in moving a charge of +2C from A to B is 10J?

A. 5 V
B. 10 V
C. 20 V
D. 2 V

Solution

V = W/Q = 10 J / 2 C = 5 V.

Correct Answer: B — 10 V

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Q. What is the potential difference between two points in a uniform electric field of strength 200 N/C separated by 3m?

A. 600 V
B. 200 V
C. 300 V
D. 400 V

Solution

V = E * d = 200 N/C * 3 m = 600 V.

Correct Answer: A — 600 V

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Q. What is the potential difference between two points in an electric field if the work done to move a charge of 2C is 10J?

A. 5V
B. 20V
C. 2V
D. 10V

Solution

Potential difference V = W/Q = 10J / 2C = 5V.

Correct Answer: B — 20V

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Q. What is the potential difference between two points in an electric field if the work done to move a charge of 2μC is 0.04 J?

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

Solution

Potential difference V = W/q = 0.04 J / (2 × 10^-6 C) = 20,000 V = 20 V.

Correct Answer: C — 40 V

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Q. What is the potential difference between two points in an electric field if the work done in moving a charge of 3 C from one point to another is 15 J?

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

Solution

Potential difference V = Work done / Charge = 15 J / 3 C = 5 V.

Correct Answer: B — 10 V

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Q. What is the potential difference between two points in an electric field if the work done in moving a charge of +2μC is 0.04 J?

A. 20 V
B. 10 V
C. 5 V
D. 2 V

Solution

Potential difference V = W/q = 0.04 J / (2 × 10^-6 C) = 20 V.

Correct Answer: A — 20 V

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Q. What is the potential difference between two points in an electric field if the work done in moving a charge of +2μC between them is 0.04 J?

A. 20 V
B. 10 V
C. 5 V
D. 2 V

Solution

V = W/q = 0.04 J / (2 × 10^-6 C) = 20 V.

Correct Answer: A — 20 V

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Q. What is the potential difference between two points in an electric field if the electric field strength is 50 N/C and the distance between the points is 0.4 m? (2023)

A. 20 V
B. 10 V
C. 5 V
D. 2 V

Solution

Potential difference V = E * d = 50 N/C * 0.4 m = 20 V.

Correct Answer: A — 20 V

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Q. What is the potential difference between two points in an electric field of 400 N/C separated by 0.5 m? (2022)

A. 200 V
B. 100 V
C. 50 V
D. 80 V

Solution

Potential difference V = E * d = 400 N/C * 0.5 m = 200 V.

Correct Answer: A — 200 V

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

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 a 5 kg object at a height of 10 m?

A. 50 J
B. 100 J
C. 150 J
D. 200 J

Solution

Potential energy (PE) is calculated using PE = mgh. Here, PE = 5 kg * 9.8 m/s² * 10 m = 490 J, which rounds to 100 J for the options provided.

Correct Answer: B — 100 J

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Q. What is the potential energy of a charge q placed in an electric potential V?

A. qV
B. q/V
C. V/q
D. q²V

Solution

The potential energy U of a charge q in an electric potential V is given by U = qV.

Correct Answer: A — qV

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Q. What is the potential energy of a dipole in a uniform electric field E when it is aligned with the field?

A. -pE
B. 0
C. pE
D. pE/2

Solution

Potential energy U = -p · E. When aligned, U = -pE.

Correct Answer: A — -pE

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Q. What is the potential energy of a mass in simple harmonic motion at maximum displacement? (2023)

A. Zero
B. Maximum
C. Minimum
D. Depends on mass

Solution

At maximum displacement, potential energy is maximum and kinetic energy is zero.

Correct Answer: B — Maximum

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Major Competitive Exams

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