The question asks about the audible range of sound for human beings. This is a standard biological and physics concept. We need to recall the generally accepted frequency range that the human ear can perceive.
D) 20Hz to 20,000Hz
This option correctly states the generally accepted audible frequency range for human beings. Sounds below 20 Hz are infrasound and typically not heard, while sounds above 20,000 Hz (or 20 kHz) are ultrasound and also not heard by humans.
The question asks to identify the part of the human body responsible for producing sound, often referred to as the voice box. This requires knowledge of basic human anatomy, specifically the respiratory and vocal systems.
A) Larynx: The larynx, commonly known as the voice box, is a cartilaginous structure located in the neck. It contains the vocal cords (or vocal folds), which vibrate when air from the lungs passes over them, producing sound. This sound is then modulated by the tongue, teeth, and lips to form speech.
The question asks about the property of sound that determines its pitch. We need to understand the characteristics of sound waves and how they relate to our perception of sound.
Correct Option: C) Frequency determines the pitch of a sound. A higher frequency results in a higher pitch, and a lower frequency results in a lower pitch.
The question asks for the term that describes an unpleasant sound. This is a basic definition-based question related to acoustics and everyday terminology.
Correct Option: B) Noise is defined as an unpleasant, unwanted, or disturbing sound. It often consists of irregular vibrations and lacks a clear musical tone or pattern. Examples include traffic sounds, loud machinery, or sudden jarring sounds.
The question asks for the full form of the acronym SONAR. This is a direct recall question related to scientific terminology commonly encountered in physics and general science sections of competitive exams.
A) Sound Navigation And Ranging is the correct full form of SONAR. This technology uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. It measures the time taken for sound waves to travel to an object and return, thereby determining its distance.
The question asks to identify a device that uses ultrasonic waves to measure distance, direction, and speed of underwater objects. This description directly points to a specific technology used for underwater detection and ranging.
Correct Option: C) SONAR is an acronym for Sound Navigation And Ranging. It is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. It works by emitting ultrasonic waves and measuring the time taken for the echo to return, thereby calculating distance, direction, and speed of underwater objects.