Echo sounding is the technique applied to— (1) measure the depth of the sea (2) measure the amplitude of sound waves (3) record earthquake waves (4) record the density of air in the atmosphere

Echo sounding is the technique applied to— (1) measure the depth of the sea (2) measure the amplitude of sound waves (3) record earthquake waves (4) record the density of air in the atmosphere
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(1) measure the depth of the sea Explanation: Echo sounding is the technique of using sound pulses to find the depth of water. The interval from the emission of a pulse to reception of its echo is recorded, and the depth calculated from the known speed of propagation of sound through water. This information is then typically used for navigation purposes or in order to obtain depths for charting purposes.
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Echo sounding is the tech-nique applied to— (1) measure the depth of the sea (2) measure the amplitude of sound waves (3) record earthquake waves (4) record the density of air in the atmosphere

Description : Echo sounding is the tech-nique applied to— (1) measure the depth of the sea (2) measure the amplitude of sound waves (3) record earthquake waves (4) record the density of air in the atmosphere

Last Answer :  measure the depth of the sea

Pick up the correct statement from the following: (A) For nautical purposes, low water level is generally referred to by the navigators (B) The depth of the bed of the sea from the surface of water is called sounding (C) The contour lines on the bed of a water body are called fathoms (D) All the abov

Description : Pick up the correct statement from the following: (A) For nautical purposes, low water level is generally referred to by the navigators (B) The depth of the bed of the sea from the surface of water is ... (C) The contour lines on the bed of a water body are called fathoms (D) All the above

Last Answer : (D) All the above

The instrument which uses sound waves to measure the depth of oceans is – (1) Radar (2) Sonar (3) Altimeter (4) Venturimeter

Description : The instrument which uses sound waves to measure the depth of oceans is – (1) Radar (2) Sonar (3) Altimeter (4) Venturimeter

Last Answer : (2) Sonar Explanation: The instrument which uses sound waves to measure the depth of oceans is sonar. Sound waves can travel much faster from one point to another. Sound waves are far more ... Sonar may also be used in air for robot navigation, and SODAR is used for atmospheric investigations.

The instrument which uses sound waves to measure the depth of oceans is (1) Radar (2) Sonar (3) Altimeter (4) Venturimeter

Description : The instrument which uses sound waves to measure the depth of oceans is (1) Radar (2) Sonar (3) Altimeter (4) Venturimeter

Last Answer : Sonar

What is the epicentre of an Earthquake? (1) The point at which earth-quake originates (2) The point which is prone to volcanoes (3) The point from which the intensity of seismic waves declines (4) The point on the earth's surface vertically above the seismic focus

Description : What is the epicentre of an Earthquake? (1) The point at which earth-quake originates (2) The point which is prone to volcanoes (3) The point from which the intensity of seismic waves declines (4) The point on the earth's surface vertically above the seismic focus

Last Answer : (4) The point on the earth's surface vertically above the seismic focus Explanation: The epicenter is the point on the Earth's surface that is directly above the hypocenter or focus, the point where ... point where the fault begins to rupture, and in most cases, it is the area of greatest damage.

"Tsunami" is the name given to which of the following? (1) Earthquake (2) Cyclone (3) Tidal Waves (4) Undersea Waves

Description : "Tsunami" is the name given to which of the following? (1) Earthquake (2) Cyclone (3) Tidal Waves (4) Undersea Waves

Last Answer : (1) Earthquake Explanation: A tsunami or tidal wave is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large ... volcanic eruptions and other underwater explosions above or below water all have the potential to generate a tsunami.

Match List I (Layers of Atmosphere) and List II (Characteristics) and select the correct answer using the code given below. L ist I L i st I I (L ayer of (Char acter ist ics) At mospher e) A. Ionosphere I. Contains Ozone B. Stratosphere II. Reflects radio Waves C. Exosphere III. Fall in Temperature D. Troposphere IV. Extremely low air density (1) A-II, B-III, C-IV, D-I (2) A-II, B-I, C-IV, D-III (3) A-II, B-III, C-I, D-IV (4) A-III, B-I, C-IV, D-II

Description : Match List I (Layers of Atmosphere) and List II (Characteristics) and select the correct answer using the code given below. L ist I L i st I I (L ayer of (Char acter ist ics) At mospher e) A. Ionosphere I. Contains Ozone B. ... D-III (3) A-II, B-III, C-I, D-IV (4) A-III, B-I, C-IV, D-II

Last Answer : 2) A-II, B-I, C-IV, D-III

The main cause of Tsunami is : (1) Volcanoes (2) Cyclones (3) Earthquake on sea floor (4) Moon's attraction

Description : The main cause of Tsunami is : (1) Volcanoes (2) Cyclones (3) Earthquake on sea floor (4) Moon's attraction

Last Answer : (3) Earthquake on sea floor Explanation: A tsunami is a series of water waves caused by the displacement of a large volume of a body of water, typically an ocean or a large lake. ... , meteorite impacts and other disturbances above or below water all have the potential to generate a tsunami.

What does it mean when sound waves have a large amplitude?

Description : What does it mean when sound waves have a large amplitude?

Last Answer : Feel Free to Answer

If viewed on an oscilloscope, the loudness of a sound wave would be associated with the wave's: w) frequency x) wavelength y) velocity z) amplitude

Description : If viewed on an oscilloscope, the loudness of a sound wave would be associated with the wave's: w) frequency x) wavelength y) velocity z) amplitude

Last Answer : ANSWER: Z -- AMPLITUDE

The circuit shown in the illustration represents a ________. EL-0090 A. battery charging circuit B. synchronous exciter C. depth sounding unit D. cathodic protection system

Description : The circuit shown in the illustration represents a ________. EL-0090 A. battery charging circuit B. synchronous exciter C. depth sounding unit D. cathodic protection system

Last Answer : Answer: D

Pycnometer is an instrument used to measure the – (1) Density (2) Intensity of solar radiation (3) Intensity of earthquake (4) High temperatures

Description : Pycnometer is an instrument used to measure the – (1) Density (2) Intensity of solar radiation (3) Intensity of earthquake (4) High temperatures

Last Answer : (1) Density Explanation: A gas pycnometer is a laboratory device used for measuring the density - or more accurately the volume - of solids, be they regularly shaped, porous or non-porous, ... , employing some method of has displacement and the volume-pressure relationship known as Boyle's Law.

Pycnometer is an instrument used to measure the (1) density (2) intensity of solar radiation (3) intensity of earthquake (4) high temperatures

Description : Pycnometer is an instrument used to measure the (1) density (2) intensity of solar radiation (3) intensity of earthquake (4) high temperatures

Last Answer : density

The layer of the atmosphere in which Radio Waves are reflected back is called- (1) Ionosphere (2) Troposphere (3) Stratosphere (4) Exosphere

Description : The layer of the atmosphere in which Radio Waves are reflected back is called- (1) Ionosphere (2) Troposphere (3) Stratosphere (4) Exosphere

Last Answer : (1) Ionosphere Explanation: The Radio waves are reflected back to Earth in the Ionosphere which is an electrically charged layer of the upper atmosphere. This process is used to communicate beyond the horizon, atintercontinental distances, mostly in the shortwave frequency bands.

The strength of wave action depends on all these EXCEPT: A. Currents in the sea (Answer) B. Wind strength C. Depth of coastal water D. Height of waves

Description : The strength of wave action depends on all these EXCEPT: A. Currents in the sea (Answer) B. Wind strength C. Depth of coastal water D. Height of waves

Last Answer : A. Currents in the sea (Answer)

Surf zone is: (A) The fathom line of 10 m depth (B) The fathom line of 5 m depth (C) The swell of the sea breaking on the shore or reefs (D) The coast line attacked by the waves

Description : Surf zone is: (A) The fathom line of 10 m depth (B) The fathom line of 5 m depth (C) The swell of the sea breaking on the shore or reefs (D) The coast line attacked by the waves

Last Answer : (C) The swell of the sea breaking on the shore or reefs

Suppose if we measure the time lapse between the two Sunsets by sitting in the beach, from this we can estimate – (1) The distance between the sun and the earth (2) The depth of the ocean (3) The radius of the earth (4) The radius of the sun

Description : Suppose if we measure the time lapse between the two Sunsets by sitting in the beach, from this we can estimate – (1) The distance between the sun and the earth (2) The depth of the ocean (3) The radius of the earth (4) The radius of the sun

Last Answer : (3) The radius of the earth Explanation: A method is described whereby, using primitive equipment anyone can measure the size of the earth to an accuracy of order of magnitude 10% by observing two sunsets in the space of a few seconds.

In sea, plants are restricted up to the depth of – (1) 20 m (2) 200 m (3) 1000 m (4) 2000 m

Description : In sea, plants are restricted up to the depth of – (1) 20 m (2) 200 m (3) 1000 m (4) 2000 m

Last Answer : (2) 200 m Explanation: In sea, vegetations are found upto the depth of 200 m.

‘Dead Sea’ is called so because - (1) the water is brackish (2) it does not support any acquatic life (3) it is not favourable for navigation (4) it has no waves

Description : ‘Dead Sea’ is called so because - (1) the water is brackish (2) it does not support any acquatic life (3) it is not favourable for navigation (4) it has no waves

Last Answer : (2) it does not support any acquatic life Explanation: The Dead Sea is a salt lake bordering Jordan to the east and Israel and the West Bank to the west. With 33.7% salinity, it is ... than the ocean. This salinity makes for a harsh environment in which animals cannot flourish, hence its name.

Seismic sea waves which approach the coasts at greater force arc known as – (1) Tides (2) Tsunami (3) Current (4) Cyclone

Description : Seismic sea waves which approach the coasts at greater force arc known as – (1) Tides (2) Tsunami (3) Current (4) Cyclone

Last Answer : (2) Tsunami Explanation: A tsunami is a series of water waves caused by the displacement of a large volume of a body of water, typically an ocean or a large lake. Earthquakes, volcanic ... initially resemble a rapidly rising tide, and for this reason they are often referred to as tidal waves.

What is the technique of detecting the position of objects by producing very high frequency sound waves and listening to the echos?

Description : What is the technique of detecting the position of objects by producing very high frequency sound waves and listening to the echos?

Last Answer : ANSWER: SONAR  

1. Which type of coal is difficult to light in the open air? 2. Leukaemia or blood cancer is characterised by abnormal increase of which cells? 3. Howmany subjects are in the Union list? 4. Which instrument instrument used for recording earthquake waves? 5. Which Mughalemperor gave land for the construction of the Golden Temple at Amritsar?

Description : 1. Which type of coal is difficult to light in the open air? 2. Leukaemia or blood cancer is characterised by abnormal increase of which cells? 3. Howmany subjects are in the Union list? ... ship was sailing? 20. Which gave an impetus to the growth of militant nationalism on a widespread scale?

Last Answer : Answer : 1. Peat 2. White blood cells 3. 97 subjects 4. Seismograph 5. Akbar 6. Loss of electrons 7. Bangladesh 8. Under valuation of the assets. 9. Volcanoes 10. Guru Gobind Singh 11. ... 15. Wandiwash 16. Western Australia 17. Kathak 18. Pitcher plant 19. Mediterranean Sea 20. Partition of Bengal

Speed of sound in water is 1500 m s-1, depth of water when reflected sound waves are detected after 0.40 s is A. 700 m B. 600 km C. 600 m D. 750 km

Description : Speed of sound in water is 1500 m s-1, depth of water when reflected sound waves are detected after 0.40 s is A. 700 m B. 600 km C. 600 m D. 750 km

Last Answer : 600 m

How much of an increase in wave amplitude is seen for an earthquake?

Description : How much of an increase in wave amplitude is seen for an earthquake?

Last Answer : Need answer

The term "infrasonic" applied to sound refers to sound waves below - (1) 200 Hz (2) 20000 Hz (3) 20 Hz (4) 0 Hz

Description : The term "infrasonic" applied to sound refers to sound waves below - (1) 200 Hz (2) 20000 Hz (3) 20 Hz (4) 0 Hz

Last Answer : (3) 20 Hz Explanation: The term "infrasonic" applied to sound refers to sound waves below the frequencies of audible sound, and nominally includes anything under 20Hz.

How to measure the depth of the sea ?

Description : How to measure the depth of the sea ?

Last Answer : The depth of the ocean can be measured with the help of sound waves.

Density of the earth's atmosphere is highest in the – (1) Troposphere (2) Stratosphere (3) Mesosphere (4) Ionosphere

Description : Density of the earth's atmosphere is highest in the – (1) Troposphere (2) Stratosphere (3) Mesosphere (4) Ionosphere

Last Answer : (1) Troposphere Explanation: Over 99% of the mass of the earth's atmosphere is contained in two layers: the troposphere and the stratosphere. Most of the earth's atmosphere (80 to 90%) is found in the ... . This layer, where the earth's weather occurs, is within about 12 km of the earth's surface.

One of the ports on my "5.1" Surround Sound console makes whatever speaker is plugged into it weak sounding. Anything i can do to fix it myself?

Description : One of the ports on my "5.1" Surround Sound console makes whatever speaker is plugged into it weak sounding. Anything i can do to fix it myself?

Last Answer : If you don’t have any warranty left on it, you could hack it open and take a look, and if the problem is obvious, you could maybe try to fix it.

Which of the following statements is true? (a) Both salinity and density of sea increase with depth (b) Both salinity and density of sea decrease with depth (c) Salinity increase but density of sea deceases with depth (d) Salinity decreases but density of sea increases with depth

Description : Which of the following statements is true? (a) Both salinity and density of sea increase with depth (b) Both salinity and density of sea decrease with depth (c) Salinity increase but density of sea deceases with depth (d) Salinity decreases but density of sea increases with depth

Last Answer : Ans:(d)

The density of sea water is highest as (a) Depth increases and salinity increases (b) Depth decreases and salinity increases (c) Depth increases and salinity decreases (d) Depth decreases and salinity decreases

Description : The density of sea water is highest as (a) Depth increases and salinity increases (b) Depth decreases and salinity increases (c) Depth increases and salinity decreases (d) Depth decreases and salinity decreases

Last Answer : Ans:(a)

The density of sea water increase as (a) depth and salinity decrease (b) depth decreases and salinity increases (c) depth increases and salinity decreases (d) depth and salinity increase

Description : The density of sea water increase as (a) depth and salinity decrease (b) depth decreases and salinity increases (c) depth increases and salinity decreases (d) depth and salinity increase

Last Answer : Ans:(d)

Which phenomenon do bats or dolphins use to find prey, predators or obstacles? (1) Refraction of sound (2) Formation of beats (3) Scattering of sound (4) Echo location

Description : Which phenomenon do bats or dolphins use to find prey, predators or obstacles? (1) Refraction of sound (2) Formation of beats (3) Scattering of sound (4) Echo location

Last Answer : (4) Echo location Explanation: Echolocation, also called biosonar, is the biological sonar used by several kinds of animals. Echolocating animals emit calls out to the environment and ... swiftlets in the genus Aerodramus (formerly Collocalia) and the unrelated Of bird Steatornis caripensis.

Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarization

Description : Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarization

Last Answer : (1) Reflection Explanation: Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the ... reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.

In acoustics, _____ is the apparent change in frequency or pitch when a sound source moves either toward or away from a listener. A. flanking B. reverberation C. Doppler effect D. echo

Description : In acoustics, _____ is the apparent change in frequency or pitch when a sound source moves either toward or away from a listener. A. flanking B. reverberation C. Doppler effect D. echo

Last Answer : C. Doppler effect

Which of the following is NOT an acoustical defect to be avoided in acoustical designs? A. Reverberation B. Flutter echo C. Distortion D. Sound concentration

Description : Which of the following is NOT an acoustical defect to be avoided in acoustical designs? A. Reverberation B. Flutter echo C. Distortion D. Sound concentration

Last Answer : A. Reverberation

What do you call the perceptible sound repetition? A. Reverberation B. Echo C. Reflection D. Masking

Description : What do you call the perceptible sound repetition? A. Reverberation B. Echo C. Reflection D. Masking

Last Answer : B. Echo

The time interval between the original sound and the reflected sound for an echo to be

Description : The time interval between the original sound and the reflected sound for an echo to be

Last Answer : heard is >=0.1s.

Echo is a ------ of sound? A. Reflection (Answer) B. Refraction C. Interference D. None

Description : Echo is a ------ of sound? A. Reflection (Answer) B. Refraction C. Interference D. None

Last Answer : A. Reflection (Answer)

The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ----? A. 1120 ft B. 120 ft C. 56 ft (Answer) D. 100 ft E. None of these

Description : The echo (reflected sounD. will be distinctly heard only at ordinary temperatures if the distance of the reflecting surfaces from the source of sound is at least ----? A. 1120 ft B. 120 ft C. 56 ft (Answer) D. 100 ft E. None of these

Last Answer : C. 56 ft (Answer)

The sensor that sends out sound pulses called pings, then receives the returning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Description : The sensor that sends out sound pulses called pings, then receives the returning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Last Answer : A : Active Sonar

The sensor that sends out sound pulses called pings, then receives thereturning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Description : The sensor that sends out sound pulses called pings, then receives thereturning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Last Answer : A : Active Sonar

The sensor that sends out sound pulses called pings, then receives the returning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Description : The sensor that sends out sound pulses called pings, then receives the returning sound echo is called A : Active Sonar B : Passive Sonar C : Radar D : Laser Rangefinder

Last Answer : A : Active Sonar

The sound which continues even after its source is cut off, is called (A) Reverberation (B) Echo (C) Intensity of sound (D) Interferenc

Description : The sound which continues even after its source is cut off, is called (A) Reverberation (B) Echo (C) Intensity of sound (D) Interferenc

Last Answer : Answer: Option A

To hear distinct echo each time interval between original sound and reflected sound must be a)0.2sec b)1sec c)2sec d)0.1sec

Description : To hear distinct echo each time interval between original sound and reflected sound must be a)0.2sec b)1sec c)2sec d)0.1sec

Last Answer : d)0.1sec

Which phenomenon do bats or dolphins use to find prey, predators or obstacles ? (1) Refraction of sound (2) Formation of beats (3) Scattering of sound (4) Echo location

Description : Which phenomenon do bats or dolphins use to find prey, predators or obstacles ? (1) Refraction of sound (2) Formation of beats (3) Scattering of sound (4) Echo location

Last Answer : Echo location

Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarisation

Description : Which phenomenon is responsible for the echo of sound wave? (1) Reflection (2) Refraction (3) Interference (4) Polarisation

Last Answer : Reflection

Richter Scale is used for measuring : (1) Velocity of wind (2) Density of liquid (3) Intensity of earthquake (4) Humidity of air

Description : Richter Scale is used for measuring : (1) Velocity of wind (2) Density of liquid (3) Intensity of earthquake (4) Humidity of air

Last Answer : Intensity of earthquake

Velocity of sound waves through any material depends on A. the material's density ‘d’ only B. the material's density ‘d’ as well as its modulus of elasticity ‘E’ C. the material's modulus of elasticity ‘E’ only D. neither the material's density ‘d’ nor its modulus of elasticity ‘E’

Description : Velocity of sound waves through any material depends on A. the material's density ‘d’ only B. the material's density ‘d’ as well as its modulus of elasticity ‘E’ C. the material's modulus of elasticity ‘E’ only D. neither the material's density ‘d’ nor its modulus of elasticity ‘E’

Last Answer : the material's density ‘d’ as well as its modulus of elasticity ‘E’

Which of the following property of sound is affected by change in air temperature – (1) Frequency (2) Intensity (3) Amplitude (4) Wavelength

Description : Which of the following property of sound is affected by change in air temperature – (1) Frequency (2) Intensity (3) Amplitude (4) Wavelength

Last Answer : (4) Wavelength Explanation: The wavelength of sound changes with temperature. This is because the speed of sound changes with the temperature. Since the speed of sound is different at different temperature, this ... while the same tone in fresh water at 68°F would have a wavelength of 48.05 feet.

Which of the following property of sound is affected by change in air temperature (1) Frequency (2) Intensity (3) Amplitude (4) Wavelength

Description : Which of the following property of sound is affected by change in air temperature (1) Frequency (2) Intensity (3) Amplitude (4) Wavelength

Last Answer : Wavelength