Physics Study Resources for Competitive Exam Success

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Q. If a circuit has a total voltage of 24V and a total resistance of 8Ω, what is the total current? (2020)

A. 3A
B. 2A
C. 4A
D. 6A

Solution

Using Ohm's law, I = V/R = 24V/8Ω = 3A.

Correct Answer: C — 4A

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Q. If a circuit has a total voltage of 24V and a total resistance of 8Ω, what is the total current flowing through the circuit? (2023)

A. 3A
B. 2A
C. 4A
D. 6A

Solution

Using Ohm's law, I = V/R = 24V/8Ω = 3A.

Correct Answer: C — 4A

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Q. If a circuit has a total voltage of 50V and a total resistance of 10Ω, what is the total current flowing through the circuit? (2020)

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

Solution

Using Ohm's law, I = V/R = 50V/10Ω = 5A.

Correct Answer: A — 5A

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Q. If a circuit has a voltage of 12 V and a resistance of 3 ohms, what is the current flowing through the circuit? (2022)

A. 4 A
B. 3 A
C. 2 A
D. 1 A

Solution

Using Ohm's law (I = V/R), I = 12 V / 3 Ω = 4 A.

Correct Answer: A — 4 A

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Q. If a circuit has a voltage of 24V and a current of 3A, what is the resistance? (2022)

A. 4Ω
B. 6Ω
C. 8Ω
D. 12Ω

Solution

Using Ohm's Law, R = V / I = 24V / 3A = 8Ω.

Correct Answer: B — 6Ω

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Q. If a circuit has a voltage of 24V and a current of 6A, what is the resistance? (2022)

A. 2Ω
B. 4Ω
C. 6Ω
D. 8Ω

Solution

Using Ohm's Law, R = V/I = 24V / 6A = 4Ω.

Correct Answer: D — 8Ω

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Q. If a force of 10 N is applied to a mass of 2 kg, what will be the acceleration of the mass? (2019)

A. 2 m/s²
B. 5 m/s²
C. 10 m/s²
D. 20 m/s²

Solution

Using F = ma, a = F/m = 10 N / 2 kg = 5 m/s².

Correct Answer: B — 5 m/s²

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Q. If a force of 10 N moves an object 5 m in the direction of the force, what is the work done? (2020)

A. 50 J
B. 10 J
C. 5 J
D. 25 J

Solution

Work Done (W) = Force (F) * Distance (d) = 10 N * 5 m = 50 J

Correct Answer: A — 50 J

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Q. If a force of 15 N is applied to a 3 kg object, what is the object's acceleration? (2023)

A. 3 m/s²
B. 5 m/s²
C. 7 m/s²
D. 10 m/s²

Solution

Using F = ma, a = F/m = 15 N / 3 kg = 5 m/s².

Correct Answer: B — 5 m/s²

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Q. If a force of 15 N is applied to move an object 3 m, what is the work done? (2023)

A. 45 J
B. 30 J
C. 60 J
D. 15 J

Solution

Work Done (W) = Force * Distance = 15 N * 3 m = 45 J

Correct Answer: A — 45 J

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Q. If a force of 50 N is applied to a 25 kg object, what is the acceleration of the object? (2022)

A. 1 m/s²
B. 2 m/s²
C. 3 m/s²
D. 4 m/s²

Solution

Using F = ma, a = F/m = 50 N / 25 kg = 2 m/s².

Correct Answer: B — 2 m/s²

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Q. If a force of 50 N is applied to a 25 kg object, what is the resulting acceleration? (2022)

A. 1 m/s²
B. 2 m/s²
C. 3 m/s²
D. 4 m/s²

Solution

Acceleration = Force / Mass = 50 N / 25 kg = 2 m/s².

Correct Answer: B — 2 m/s²

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Q. If a force of 50 N is applied to a 25 kg object, what will be its acceleration? (2022)

A. 1 m/s²
B. 2 m/s²
C. 3 m/s²
D. 4 m/s²

Solution

Acceleration = Force / Mass = 50 N / 25 kg = 2 m/s².

Correct Answer: B — 2 m/s²

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Q. If a machine does 200 J of work in 10 seconds, what is its power? (2022)

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

Solution

Power (P) = Work / Time = 200 J / 10 s = 20 W

Correct Answer: A — 20 W

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Q. If a machine does 200 J of work in 5 seconds, what is its power? (2022)

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

Solution

Power (P) = Work Done (W) / Time (t) = 200 J / 5 s = 40 W

Correct Answer: B — 50 W

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Q. If a machine does 2000 J of work in 5 seconds, what is its power? (2022)

A. 400 W
B. 200 W
C. 100 W
D. 500 W

Solution

Power (P) = Work Done / Time = 2000 J / 5 s = 400 W

Correct Answer: A — 400 W

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Q. If a material has a high shear modulus, what does it indicate about the material? (2023)

A. It is very elastic
B. It is very ductile
C. It resists shear deformation
D. It is very brittle

Solution

A high shear modulus indicates that the material resists shear deformation.

Correct Answer: C — It resists shear deformation

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Q. If a material has a shear modulus of 80 GPa and a shear stress of 40 MPa is applied, what is the shear strain? (2023)

A. 0.0005
B. 0.005
C. 0.5
D. 0.05

Solution

Shear strain (γ) = Shear stress (τ) / Shear modulus (G) = 40 MPa / 80 GPa = 0.0005.

Correct Answer: A — 0.0005

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Q. If a measurement has a relative error of 5%, what does this indicate? (2022)

A. The measurement is very accurate
B. The measurement is very precise
C. The measurement is off by 5% of the true value
D. The measurement is exact

Solution

A relative error of 5% indicates that the measurement is off by 5% of the true value.

Correct Answer: C — The measurement is off by 5% of the true value

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Q. If a measurement is accurate but not precise, what does it imply? (2019)

A. All measurements are close to each other
B. Measurements are close to the true value
C. Measurements vary widely
D. None of the above

Solution

Accuracy refers to how close a measurement is to the true value.

Correct Answer: B — Measurements are close to the true value

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Q. If a measurement is accurate, it means: (2019)

A. It is close to the true value
B. It is consistent
C. It has a small error
D. It is precise

Solution

Accuracy refers to how close a measured value is to the true value.

Correct Answer: A — It is close to the true value

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Q. If a measurement is said to have a precision of 0.01 cm, what does this imply? (2019)

A. The measurement is accurate to 0.01 cm
B. The measurement can vary by 0.01 cm
C. The measurement is exact
D. The measurement is rounded to 0.01 cm

Solution

A precision of 0.01 cm implies that the measurement can vary by this amount, indicating the level of uncertainty.

Correct Answer: B — The measurement can vary by 0.01 cm

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Q. If a resistor has a current of 2A flowing through it and a voltage of 10V across it, what is the resistance? (2023)

A. 2Ω
B. 5Ω
C. 10Ω
D. 20Ω

Solution

Using Ohm's Law, R = V / I = 10V / 2A = 5Ω.

Correct Answer: B — 5Ω

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Q. If a resistor has a resistance of 10Ω and a current of 2A flows through it, what is the voltage across the resistor? (2023)

A. 5V
B. 10V
C. 20V
D. 30V

Solution

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

Correct Answer: C — 20V

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Q. If a resistor has a resistance of 10Ω and a current of 5A flows through it, what is the voltage across the resistor? (2023)

A. 10V
B. 20V
C. 30V
D. 50V

Solution

Using Ohm's Law, V = I * R = 5A * 10Ω = 50V.

Correct Answer: B — 20V

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Q. If a resistor has a resistance of 8Ω and the current flowing through it is 4A, what is the power dissipated by the resistor? (2022)

A. 16W
B. 32W
C. 64W
D. 8W

Solution

Power (P) can be calculated using P = I^2 * R = (4A)^2 * 8Ω = 16 * 8 = 128W.

Correct Answer: B — 32W

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Q. If a resistor has a resistance of 8Ω and the current flowing through it is 4A, what is the voltage across the resistor? (2022)

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

Solution

Using Ohm's Law, V = I * R = 4A * 8Ω = 32V.

Correct Answer: B — 16V

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Q. If a ruler has a least count of 0.1 cm, what is the maximum error in measurement? (2023)

A. 0.05 cm
B. 0.1 cm
C. 0.2 cm
D. 0.01 cm

Solution

The maximum error is typically taken as the least count of the measuring instrument, which is 0.1 cm.

Correct Answer: B — 0.1 cm

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Q. If a ruler has a least count of 0.1 cm, what is the smallest measurement it can accurately provide? (2023)

A. 0.1 cm
B. 0.05 cm
C. 0.01 cm
D. 1 cm

Solution

The least count of a measuring instrument is the smallest value that can be measured accurately, which in this case is 0.1 cm.

Correct Answer: A — 0.1 cm

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Q. If a thin film of oil on water produces a green color due to interference, what can be inferred about the thickness of the film? (2023)

A. It is very thick
B. It is very thin
C. It is of variable thickness
D. It is equal to the wavelength of green light

Solution

Thin films produce colors due to interference; a green color indicates a thin film where the thickness is comparable to the wavelength of visible light.

Correct Answer: B — It is very thin

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Physics

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