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Physics questions and answers

Browse questions about Physics, with answers and explanations.

128 questions

Electric Current and Its Effects39 questions Fluid Mechanics5 questions Force and Pressure31 questions Gravitation10 questions Heat and Thermodynamics13 questions Light and Optics14 questions Mechanical Properties of Solids1 questions Sound15 questions

Questions

QUESTION

Which term describes the human ear’s perception of the strength of a sound?

QUESTION

Which of the following equations correctly represents the formula used to determine the weight of a body under gravity?

QUESTION

In the usual near-Earth setting, which force causes an object released from rest to accelerate toward Earth when other forces are negligible?

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According to the universal law of gravitation, the gravitational force acting between two bodies depends directly on which of the following?

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Considering the actual orbits rather than circular constant-speed approximations, which are examples of exactly uniform circular motion? I. The Moon around Earth II. Earth…

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If an object weighs 3 N on the surface of the Moon, what would be its approximate weight if brought back to the surface…

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Near Earth’s surface, consider these statements: I. Weight has magnitude but no direction. II. Weight is a gravitational force directed locally downward. Which statements…

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An object weighs 441 N where g = 9.8 m/s². What is its mass?

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A test body moves only under the time-independent gravitational field of a stationary spherical central mass. Which quantities are conserved, with angular momentum measured…

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According to the Law of Periods, the square of a planet's time period is proportional to:

QUESTION

Which interaction chiefly binds planetary systems and governs their large-scale orbital motion?

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At fixed frequency in a fixed medium, the intensity of a small-amplitude sinusoidal sound wave is proportional to which mathematical function of its displacement…

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Statement I: Sound can travel through a vacuum. Statement II: In human beings, the vibration of vocal cords produces sound.

QUESTION

In a hearing aid, which component is responsible for receiving sound from the surroundings?

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In the usual school-textbook estimate, approximately what minimum delay separates a distinct echo from the original sound?

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In acoustics, what does the term “reverberation” refer to?

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A sound wave has a frequency of 5 kHz and wavelength of 0.5 m. How much time will it take to travel 5 km?

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Which term describes the perception of the frequency of a sound by the human brain?

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For a longitudinal sound wave in air, consider these statements: I. Compression is a region of pressure above the undisturbed value. II. Rarefaction is…

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Why may appropriately designed curved acoustic reflectors be used in auditoriums and cinema halls?

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What is the commonly quoted approximate audible frequency range for a young person with normal hearing?

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A sound source and an observer move along the same straight line at identical constant subsonic velocities in uniform still air. How does the…

QUESTION

A person standing on a railway platform observes a change in the pitch of a train’s whistle as it approaches and moves away. This…

QUESTION

Assertion (A): Longitudinal sound travels faster in steel than in ordinary air at the same temperature. Reason (R): Steel’s much greater elastic stiffness relative…