Physics MCQ
Which of the following sounds is produced by earthquakes before the main shock waves?
Explanation: Earthquakes emit low-frequency infrasound before the main shock waves, potentially alerting animals.
Observations suggest that animals may sense these infrasounds, causing them to exhibit unusual behavior or become disturbed before an earthquake occurs, indicating their ability to detect seismic activity early.
The unit of Planck’s constant is
Explanation: Planck's constant, representing physical action, shares dimensions with angular momentum, which is energy times time or momentum times distance.
In the International System of Units (SI), Planck's constant is measured in joule-seconds (J·s) or equivalently in newton-meter-seconds (N·m·s), highlighting its fundamental role in quantum mechanics.
Farad is the unit of which of the following?
Explanation:
The Farad (F) is the SI derived unit of capacitance, measuring a capacitor's ability to store electric charge.
Named after the English physicist Michael Faraday, it reflects his contributions to electromagnetism and electrochemistry.
One farad equals one coulomb of charge per volt of potential difference.
Loudness of sound depends upon which of the following?
Explanation: Sound has three key characteristics: pitch, loudness, and quality (or tone).
Loudness is determined by the amplitude of the sound wave—the greater the amplitude, the louder the sound.
Pitch depends on the frequency of the sound source, while quality (or tone) depends on the waveform shape.
During the free fall of the object, the decrease in potential energy, at any point in its path, appears as an equal amount of increase in ______.
Explanation:
The total mechanical energy of an object is the sum of its kinetic and potential energy. During free fall, the object's potential energy decreases while its kinetic energy increases by the same amount.
This results in a continual transformation of gravitational potential energy into kinetic energy throughout its descent.
Which of the following has the similar properties to the Photons?
Explanation: Photons, the fundamental particles of light, exhibit both particle and wave properties, enabling phenomena like refraction and diffusion.
Unlike other elementary particles, photons are massless and always travel at the speed of light in a vacuum, making them unique in their behavior and interaction with matter.
For which of the following waves the Doppler effect holds true?