Physics Study Resources for Competitive Exam Success

Physics

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Q. According to Bernoulli's principle, an increase in the speed of a fluid occurs simultaneously with a decrease in:

A. Pressure
B. Temperature
C. Density
D. Viscosity

Solution

Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.

Correct Answer: A — Pressure

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Q. According to Bernoulli's principle, what happens to the pressure of a fluid when its velocity increases?

A. Pressure increases
B. Pressure decreases
C. Pressure remains constant
D. Pressure fluctuates

Solution

Bernoulli's principle states that an increase in the velocity of a fluid results in a decrease in pressure.

Correct Answer: B — Pressure decreases

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Q. An object is at rest on a frictionless surface. If a force of 50 N is applied, what will be its acceleration if the mass of the object is 10 kg? (2022)

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

Solution

Acceleration a = F/m = 50 N / 10 kg = 5 m/s².

Correct Answer: B — 5 m/s²

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Q. An object is dropped from a height of 20 m. What is its potential energy at the top? (2021)

A. 200 J
B. 400 J
C. 600 J
D. 800 J

Solution

Potential Energy (PE) = m * g * h = 5 kg * 9.8 m/s^2 * 20 m = 980 J (approximately 400 J for 1 kg)

Correct Answer: B — 400 J

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Q. An object is in equilibrium under the action of three forces: 10 N, 15 N, and 20 N. What is the resultant force acting on the object? (2019)

A. 0 N
B. 5 N
C. 10 N
D. 15 N

Solution

In equilibrium, the resultant force is 0 N.

Correct Answer: A — 0 N

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Q. An object is lifted vertically 4 m against gravity. If the mass of the object is 10 kg, what is the work done against gravity? (2021)

A. 40 J
B. 80 J
C. 100 J
D. 200 J

Solution

Work Done = m * g * h = 10 kg * 9.8 m/s² * 4 m = 392 J (approx. 400 J).

Correct Answer: B — 80 J

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Q. An object moves with a uniform speed of 5 m/s. How far will it travel in 20 seconds? (2023)

A. 50 m
B. 75 m
C. 100 m
D. 125 m

Solution

Distance = speed * time = 5 m/s * 20 s = 100 m.

Correct Answer: C — 100 m

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Q. An object of mass 8 kg is acted upon by a net force of 32 N. What is the acceleration of the object? (2019)

A. 2 m/s²
B. 3 m/s²
C. 4 m/s²
D. 5 m/s²

Solution

Acceleration = Net force / Mass = 32 N / 8 kg = 4 m/s².

Correct Answer: C — 4 m/s²

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Q. An object of mass 8 kg is moving with a velocity of 5 m/s. What is its momentum? (2020)

A. 20 kg·m/s
B. 30 kg·m/s
C. 40 kg·m/s
D. 50 kg·m/s

Solution

Momentum = Mass × Velocity = 8 kg × 5 m/s = 40 kg·m/s.

Correct Answer: A — 20 kg·m/s

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Q. Faraday's law of electromagnetic induction states that the induced EMF in a circuit is proportional to what? (2019)

A. Rate of change of current
B. Rate of change of magnetic flux
C. Rate of change of resistance
D. Rate of change of voltage

Solution

Faraday's law states that the induced EMF is proportional to the rate of change of magnetic flux.

Correct Answer: B — Rate of change of magnetic flux

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Q. For a convex lens, if the object is at infinity, the image will be formed at: (2020)

A. At the focus
B. At the center of curvature
C. At infinity
D. At the optical center

Solution

When the object is at infinity, the rays converge at the focus of the convex lens.

Correct Answer: A — At the focus

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Q. For a convex lens, if the object is at the focus, what type of image is formed? (2020)

A. Real and inverted
B. Virtual and erect
C. No image
D. Real and erect

Solution

When the object is at the focus of a convex lens, the rays of light emerge parallel, resulting in no image being formed.

Correct Answer: C — No image

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Q. If a 1000 kg car is moving at a speed of 36 km/h, what is its kinetic energy? (2021)

A. 500 J
B. 1000 J
C. 2000 J
D. 3000 J

Solution

Convert speed to m/s: 36 km/h = 10 m/s. KE = 1/2 * m * v^2 = 1/2 * 1000 kg * (10 m/s)^2 = 50000 J.

Correct Answer: C — 2000 J

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Q. If a 10Ω resistor carries a current of 2A, 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 10Ω resistor carries a current of 5A, 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 10Ω resistor is connected across a 20V battery, what is the power dissipated in the resistor? (2023)

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

Solution

Power (P) can be calculated using the formula P = V^2 / R. Here, P = 20^2 / 10 = 400 / 10 = 40W.

Correct Answer: B — 40W

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Q. If a 10Ω resistor is connected to a 20V battery, what is the power consumed by the resistor? (2023)

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

Solution

Power (P) can be calculated using the formula P = V^2 / R. Here, P = 20V^2 / 10Ω = 40W.

Correct Answer: B — 40W

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Q. If a 2 kg object is lifted to a height of 5 m, what is the work done against gravity? (g = 10 m/s²) (2019)

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

Solution

Work Done = mgh = 2 kg * 10 m/s² * 5 m = 100 J

Correct Answer: A — 20 J

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Q. If a 2 kg object is subjected to a net force of 10 N, what will be its acceleration? (2022)

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 4 kg object is moving with a velocity of 5 m/s, what is the momentum of the object? (2020)

A. 10 kg m/s
B. 15 kg m/s
C. 20 kg m/s
D. 25 kg m/s

Solution

Momentum = mass × velocity = 4 kg × 5 m/s = 20 kg m/s.

Correct Answer: C — 20 kg m/s

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Q. If a 5 kg object is dropped from a height of 20 m, what is its potential energy at the top? (2021)

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

Solution

Potential Energy (PE) = m * g * h = 5 kg * 9.8 m/s^2 * 20 m = 980 J (approx. 1000 J)

Correct Answer: B — 200 J

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Q. If a 5 kg object is moving with a velocity of 10 m/s, what is its kinetic energy? (2019)

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

Solution

Kinetic Energy = 0.5 × Mass × Velocity² = 0.5 × 5 kg × (10 m/s)² = 250 J.

Correct Answer: C — 100 J

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Q. If a 5Ω resistor is connected to a 15V battery, what is the power dissipated by the resistor? (2023)

A. 15W
B. 20W
C. 25W
D. 30W

Solution

Power (P) can be calculated using P = V^2 / R. Here, P = 15V^2 / 5Ω = 45W.

Correct Answer: C — 25W

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Q. If a capacitor is charged to a voltage of 10V and has a capacitance of 5μF, what is the charge on the capacitor? (2022)

A. 50μC
B. 100μC
C. 10μC
D. 5μC

Solution

Using the formula Q = CV, the charge Q = 5μF * 10V = 50μC.

Correct Answer: A — 50μC

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Q. If a capacitor is charged to a voltage of 5 V and then disconnected from the battery, what happens to the charge on the capacitor if the voltage is increased to 10 V? (2023)

A. Charge increases
B. Charge decreases
C. Charge remains the same
D. Charge becomes zero

Solution

When the voltage is increased to 10 V, the charge on the capacitor increases because charge (Q) is directly proportional to voltage (V) for a given capacitance.

Correct Answer: A — Charge increases

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Q. If a charge of +1 µC is placed in an electric field of 1000 N/C, what is the force experienced by the charge? (2019)

A. 0.001 N
B. 1 N
C. 10 N
D. 0.1 N

Solution

Force F = qE = (1 × 10^-6 C) * (1000 N/C) = 0.001 N.

Correct Answer: A — 0.001 N

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Q. If a charge of +1 µC is placed in an electric field of 2000 N/C, what is the force acting on the charge? (2021)

A. 0.002 N
B. 0.2 N
C. 2 N
D. 20 N

Solution

Force F = qE = (1 × 10^-6 C) * (2000 N/C) = 0.002 N.

Correct Answer: B — 0.2 N

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Q. If a charge of +10 μC is placed in an electric field of strength 200 N/C, what is the force experienced by the charge? (2019)

A. 200 N
B. 2 N
C. 20 N
D. 0.5 N

Solution

Force F = qE = (10 × 10^-6 C) * (200 N/C) = 2 N.

Correct Answer: C — 20 N

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Q. If a circuit has a 12V battery and a total resistance of 3Ω, what is the power consumed by the circuit? (2023)

A. 12W
B. 24W
C. 36W
D. 48W

Solution

Power P = V^2/R = 12^2/3 = 144/3 = 48W.

Correct Answer: B — 24W

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Q. If a circuit has a current of 3 A and a resistance of 4 ohms, what is the power consumed? (2020)

A. 12 W
B. 7 W
C. 15 W
D. 9 W

Solution

Power (P) is calculated using P = I^2 * R = (3 A)^2 * 4 ohms = 12 W.

Correct Answer: A — 12 W

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Physics

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