Physics Study Resources for Competitive Exam Success

Physics

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Q. What is the nature of the image formed by a concave mirror when the object is placed between the focal point and the mirror? (2021)

A. Real and inverted
B. Virtual and erect
C. Real and erect
D. Virtual and inverted

Solution

When the object is placed between the focal point and the mirror, the image formed is virtual and erect.

Correct Answer: B — Virtual and erect

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Q. What is the nature of the image formed by a convex lens when the object is placed beyond the 2F point? (2019)

A. Real and inverted
B. Virtual and erect
C. Real and erect
D. Virtual and inverted

Solution

When the object is placed beyond 2F, the image formed by a convex lens is real, inverted, and diminished.

Correct Answer: A — Real and inverted

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Q. What is the path difference for the first minimum in a single-slit diffraction pattern? (2021)

A. λ/2
B. λ
C. 3λ/2
D. λ/4

Solution

The path difference for the first minimum in single-slit diffraction is λ/2.

Correct Answer: A — λ/2

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Q. What is the peak voltage of an AC source if its RMS voltage is 220 V? (2021)

A. 311 V
B. 220 V
C. 155 V
D. 440 V

Solution

The peak voltage (V_peak) is related to the RMS voltage (V_rms) by the formula V_peak = V_rms × √2. Therefore, V_peak = 220 V × √2 ≈ 311 V.

Correct Answer: A — 311 V

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Q. What is the peak voltage of an AC supply if its RMS voltage is 220 V? (2021)

A. 311 V
B. 220 V
C. 155 V
D. 440 V

Solution

The peak voltage (V_peak) is related to the RMS voltage (V_rms) by the formula V_peak = V_rms × √2. Therefore, V_peak = 220 V × √2 ≈ 311 V.

Correct Answer: A — 311 V

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Q. What is the percentage error if the measured value is 10.0 and the true value is 9.5? (2021)

A. 5.26%
B. 4.76%
C. 2.5%
D. 10%

Solution

Percentage error = (|Measured - True| / True) × 100 = (|10.0 - 9.5| / 9.5) × 100 = 5.26%.

Correct Answer: B — 4.76%

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Q. What is the percentage error if the measured value is 20 and the true value is 25? (2021)

A. 20%
B. 25%
C. 5%
D. 10%

Solution

Percentage error is calculated as (|True Value - Measured Value| / True Value) * 100 = (|25 - 20| / 25) * 100 = 20%.

Correct Answer: D — 10%

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Q. What is the percentage error if the measured value is 20.0 and the true value is 19.5? (2021)

A. 2.56%
B. 1.25%
C. 3.33%
D. 5.00%

Solution

Percentage error = (|Measured - True| / True) × 100 = (|20.0 - 19.5| / 19.5) × 100 ≈ 2.56%.

Correct Answer: A — 2.56%

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Q. What is the percentage error if the true value is 50 and the measured value is 48? (2022)

A. 4%
B. 2%
C. 5%
D. 3%

Solution

Percentage error = |(True value - Measured value) / True value| * 100 = |(50 - 48) / 50| * 100 = 4%.

Correct Answer: A — 4%

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Q. What is the phase difference between two particles executing simple harmonic motion in the same direction with the same amplitude and frequency? (2023)

A. 0
B. π/2
C. π
D. 3π/2

Solution

If two particles are executing simple harmonic motion in the same direction with the same amplitude and frequency, their phase difference is 0.

Correct Answer: A — 0

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Q. What is the phase difference between two particles executing simple harmonic motion in the same direction with the same frequency? (2021)

A. 0
B. π/2
C. π
D. 3π/2

Solution

If they have the same frequency and direction, the phase difference is 0.

Correct Answer: A — 0

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Q. What is the phase difference between two particles executing simple harmonic motion in phase? (2021)

A. 0 radians
B. π/2 radians
C. π radians
D. 3π/2 radians

Solution

In phase means the phase difference is 0 radians.

Correct Answer: A — 0 radians

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Q. What is the Poisson's ratio for a material if a longitudinal strain of 0.005 results in a lateral strain of 0.002? (2019)

A. 0.4
B. 0.5
C. 0.2
D. 0.1

Solution

Poisson's ratio (ν) = Lateral strain / Longitudinal strain = 0.002 / 0.005 = 0.4.

Correct Answer: A — 0.4

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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 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 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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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 +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 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 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 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 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 prefix for 10^6? (2022)

A. Kilo
B. Mega
C. Giga
D. Tera

Solution

The prefix for 10^6 is Mega (M).

Correct Answer: B — Mega

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Q. What is the primary application of nuclear fusion? (2023)

A. Nuclear power plants
B. Hydrogen bombs
C. Medical imaging
D. Smoke detectors

Solution

Nuclear fusion is primarily applied in hydrogen bombs, where fusion reactions release immense energy.

Correct Answer: B — Hydrogen bombs

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Q. What is the primary factor that determines the inductance of a coil? (2020)

A. Length of the wire
B. Number of turns
C. Material of the core
D. All of the above

Solution

The inductance of a coil is determined by the length of the wire, the number of turns, and the material of the core.

Correct Answer: D — All of the above

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Physics

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