Description : The waves used in sonography are (1) Micro waves (2) Infra-red waves (3) Sound waves (4) Ultrasonic waves
Last Answer : Ultrasonic waves
Description : Bats can sense obstacles because they produce – (1) supersonic sound waves (2) ultrasonic sound waves (3) infrasonic sound waves (4) micro sound waves
Last Answer : (2) ultrasonic sound waves Explanation: The reason that bats use ultrasound is because it has such a high frequency and it has a low diffraction or it bends less. They use this sound to do a ... come faster in a particular area than the rest of the sounds then they know that something is near.
Description : Bats can sense obstacles because they produce (1) supersonic sound waves (2) ultrasonic sound waves (3) infrasonic sound waves (4) micro sound waves
Last Answer : ultrasonic sound waves
Description : X-rays region lies between – (1) Ultraviolet and visible region (2) Visible and infra-red region (3) Gamma-rays and ultraviolet region (4) Short radio waves and long radio waves
Last Answer : (3) Gamma-rays and ultraviolet region Explanation: X-rays region lies between Gamma rays and ultra-violet region.
Description : Radio waves, microwaves, infra-red spectrum, ultraviolet rays, X-rays and gamma rays are classified as ______. (1) light waves (2) electromagnetic waves (3) electric waves (4) magnetic waves
Last Answer : (2) electromagnetic waves Explanation: Electromagnetic radiation is the radiant energy released by certain electromagnetic processes. It consists of electromagnetic waves which are synchronized oscillations of electric and magnetic fields that propagate at the speed of light through a vacuum.
Description : X-rays region lies between (1) Ultraviolet and visible region (2) Visible and infra-red region (3) Gamma-rays and ultraviolet region (4) Short radio waves and long radio waves
Last Answer : Gamma-rays and ultraviolet region
Description : The bats can fly in the dark because – (1) They can see the objects in darkness (2) They have weak legs and are likely to be attacked by predators (3) They generate flashes of light (4) They generate ultrasonic sound waves
Last Answer : (3) They generate flashes of light
Description : The bats can fly in the dark because (1) they can see the objects in darkness (2) they have weak legs and are likely to be attacked by predators (3) they generate flashes of light (4) they generate ultrasonic sound waves
Last Answer : they generate ultrasonic sound waves
Description : Ultrasonic waves are those sound waves having frequency
Last Answer : More than 20 kilohertz
Description : Which of the following waves are diffracted by an obstacle of size 1 cm? (a) Light waves (b) Sound waves (c) Ultrasonic waves (d) X-rays
Last Answer : Ans:(c)
Description : For ultrasonic testing, which of the following statements is true? a) It is easy to identify all defects b) The equipment shall be calibrated before use c) The equipment cannot be automated d) Sound waves will not travel through copper
Last Answer : b) The equipment shall be calibrated before use
Description : Fifth Generation Computers are (1) Data Processors (2) Knowledge Processors (3) Sound waves (4) Ultrasonic waves
Last Answer : Knowledge Processors
Description : The principle used in radar is the same as that of Sonar. In radar we use radio waves ; whereas in sonar we use ? A. red waves B. Infrared waves C. Ultrasonic (Answer) D. super sonic E. None of these
Last Answer : C. Ultrasonic (Answer)
Description : Ultrasonic waves are produced by making use of - (1) ferro magnetic material (2) ferri magnetic material (3) piezo electric material (4) pyro electrical material
Last Answer : (3) piezo electric material Explanation: In most applications, ultrasonic waves are generated by a transducer that includes a piezoelectric material (crystal) that converts electrical energy (electric current) to mechanical energy (sound waves).
Description : Which of the following waves cannot be polarized? (1) Radio (2) Ultra violet (3) Infrared (4) Ultrasonic
Last Answer : (4) Ultrasonic Explanation: Only transverse waves (such as radio, ultraviolet and infrared waves) can be polarized since their vibrations can potentially occur in all directions perpendicular to the direction of travel. It is therefore possible to confine the vibrations to a single plane.
Description : Which of the following waves cannot be polarised? (1) Radio (2) Ultra violet (3) Infrared (4) Ultrasonic
Last Answer : Ultrasonic
Description : Ozone layer above the surface of Earth provides a shield against – (1) X-rays (2) Ultra-violet rays (3) Gamma rays (4) Infra-red rays
Last Answer : (2) Ultra-violet rays Explanation: The Ozone layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth.
Description : In a filament type light bulb most of the electric power consumed appears as – (1) visible light (2) infra-red rays (3) ultra-violet rays (4) fluorescent light
Last Answer : (2) infra-red rays Explanation: When electricity is passed through the filament, the filament gets hot. Depending on the temperature of the filament, radiation is emitted from the filament. The ... energy converts into visible light and rest of it is emitted as heat or infrared radiation.
Description : Forged documents are detected by – (1) ultraviolet rays (2) infra-red rays (3) beta rays (4) gamma rays
Last Answer : (1) ultraviolet rays Explanation: Old postcards, books, signs, photos and other paper products made before the late 1930s rarely glow under a black light. Chemical bleaches and dyes used ... light. Knowing this helps to detect forged documents and distinguish reproductions in all types of ephemera.
Description : Energy of Ultraviolet rays is great than (1) Infra-red rays (2) Gamma rays (3) X-rays (4) Cosmic rays
Last Answer : (1) Infra-red rays Explanation: The electromagnetic spectrum is the name we use when we talk about different types of radiation as a group. The parts of the electromagnetic spectmm, arranged from highest energy ... mass that move in a wave pattern, all at the same speed - the speed of light.
Description : Which of the following parts of the sunlight makes the solar cooker hot? (1) Ultra violet (2) Red light (3) Infra red (4) Cosmic rays
Last Answer : (3) Infra red Explanation: Glass transmits visible light but blocks infrared thermal radiation from escaping. This amplifies the heat trapping effect. A solar cooker, or solar oven, is a device which ... The vast majority of the solar cookers presently in use are relatively cheap, low-tech devices.
Description : Green house effect is the heating up of the Earth's atmosphere which is due to – (1) the ultraviolet rays (2) y-rays (3) the infra-red rays (4) X-rays
Last Answer : (3) the infra-red rays Explanation: The greenhouse effect refers to circumstances where the short wavelengths of visible light from the sun pass through a transparent medium and are absorbed, ... The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature.
Description : Night photography and photopraphy in mist and fog are possible using – (1) ultra-violet radiation (2) infra-red radiation (3) microwave radiation (4) gamma radiation
Last Answer : (2) infra-red radiation Explanation: Infrared is used in night vision equipment when there is insufficient visible light to see. Night vision devices operate through a process involving the ... then amplified by a chemical and electrical process and then converted back into visible light.
Description : Weather satellites transmit cloud cover and temperature-humidity profiles back to Earth using images of which combination of the electromagnetic radiation types? w) infra-red and visible light x) ultraviolet and nuclear magnetic y) ultraviolet and infra-red z) ultraviolet and visible light
Last Answer : ANSWER: W -- INFRA-RED AND VISIBLE LIGHT
Description : A solar cell does NOT respond to red light, but DOES respond to green light. The solar cell will be able to respond to: w) microwaves x) infra-red light y) ultraviolet light z) all of the above
Last Answer : ANSWER: Y -- ULTRAVIOLET LIGHT
Description : Of the following, the most energetic form of NON-IONIZING radiation is: w) ultra-violet light x) infra-red light y) radar z) microwaves
Last Answer : ANSWER: W -- ULTRA-VIOLET LIGHT
Description : Green house effect is the heating up of the Earth’s atmosphere which is due to (1) the ultraviolet rays (2) g-rays (3) the infra-red rays (4) X-rays
Last Answer : the infra-red rays
Description : In a filament type light bulb most of the electric power consumed appears as (1) visible light (2) infra-red rays (3) ultra-violet rays (4) fluorescent light
Last Answer : infra-red rays
Description : Ozone layer above the surface of Earth provides a shield against (1) X-rays (2) Ultra-violet rays (3) Gamma rays (4) Infra-red rays
Last Answer : Ultra-violet rays
Description : Forged documents are detected by (1) ultraviolet rays (2) infra-red rays (3) beta rays (4) gamma rays
Last Answer : ultraviolet rays
Description : Night photography and photopraphy in mist and fog are possible using (1) ultra-violet radiation (2) infra-red radiation (3) microwave radiation (4) gamma radiation
Last Answer : infra-red radiation
Description : Energy of Ultraviolet rays is great than (1) Infra–red rays (2) Gamma rays (3) X–rays (4) Cosmic rays
Last Answer : Infra–red rays
Description : Which of the following parts of the sunlight makes the solar cooker hot ? (1) Ultra violet (2) Red light (3) Infra red (4) Cosmic rays
Last Answer : Infra red
Description : Sound of frequency below 20 Hz is called ______. (1) audio sounds (2) infrasonic (3) ultrasonic (4) supersonics
Last Answer : (2) infrasonic Explanation: The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound and nominally includes anything under 20 Hz.
Description : Which one of the following animals can hear ultrasonic sound? (1) Rat (2) Squirrel (3) Cat (4) Bat
Last Answer : (4) Bat Explanation: Ultrasound is a cyclic sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from "normal" (audible) sound based on differences in physical properties, only the fact that humans cannot hear it.
Description : The sound produced by a bat is – (1) audible (2) subsonic (3) infrasonic (4) ultrasonic
Last Answer : (4) ultrasonic Explanation: Although bats use echolocation to detect their prey, and find their way around in the dark, the sounds which they emit are 'ultrasonic', which is another way of ... (audible) sound based on differences in physical properties, only the fact that humans cannot hear it.
Description : The sound produced by a bat is– (1) audible (2) subsonic (3) infrasonic (4) ultrasonic
Last Answer : ultrasonic
Description : Which one of the following animals can hear ultrasonic sound ? (1) Rat (2) Squirrel (3) Cat (4) Bat
Last Answer : Bat
Description : The waves used for sending signals to the satellite from ground station are _____. A. Ultraviolet rays B. X-rays C. Sound waves D. Micro waves
Last Answer : ANSWER: D
Description : A mobile phone sends and receives messages through _____. A. Radio waves B. Ultraviolet waves C. Micro waves D. Sound waves
Last Answer : ANSWER: A
Description : Explain how bats use ultrasonic waves to catch prey. -Science
Last Answer : Bats catch insects with the help of an advanced navigation system known as echolocation. They are known to emit high-frequency ultrasonic waves pitched at 20-100KHz. This is too high for the natural ... . These sounds get reflected when it hits different objects and reverts to the bats as echoes.
Description : What is the frequency of ultrasonic waves? -General Knowledge
Last Answer : Ultrasonic wave is defined as “inaudible sound with high frequency for human” the frequency of which generally exceeds 20 kHz. These days, sound wave which is not intended to be heard is also called ultrasonic wave.
Last Answer : Ultrasonic is the sound above human hearing range. Human can hear maximum up to a frequency of 20 KHz. Ultrasonic frequencies are above 20 KHz. Ultrasonic waves are used to measure level of liquids and solid objects in industries.