question_data = `{ "title": " Test 8 GOC Wave propagation 2", "buttonText": "Klicka här för att rätta", "questions": [{ "number": "1", "question": "Ground-wave communications is most effective in what frequency range? ", "correct": "a", "answer": [ { "label": "a", "text": "300 kHz to 3 MHz " }, { "label": "b", "text": " 3 to 30 MHz" }, { "label": "c", "text": "30 to 300 MHz " }, { "label": "d", "text": "above 300 MHz " }] }, { "number": "2", "question": "The ionization causes the signal to be ", "correct": "a", "answer": [ { "label": "a", "text": "Diffused " }, { "label": "b", "text": " Absorbed " }, { "label": "c", "text": " refracted " }, { "label": "d", "text": " Reflected " }] }, { "number": "3", "question": "The ionosphere has the greatest effect on signals in what frequency range? ", "correct": "b", "answer": [ { "label": "a", "text": "300 kHz " }, { "label": "b", "text": " 3 to 30 MHz " }, { "label": "c", "text": "30 to 300 MHz " }, { "label": "d", "text": "Above 300 MHz " }] }, { "number": "4", "question": "The type of radio wave responsible for long-distance communications by multiple skips is the ", "correct": "d", "answer": [ { "label": "a", "text": "ground wave " }, { "label": "b", "text": " direct-wave " }, { "label": "c", "text": "surface wave " }, { "label": "d", "text": "Sky wave " }] }, { "number": "5", "question": " Line-of-sight communications is not a factor in which frequency range? ", "correct": "c", "answer": [ { "label": "a", "text": " VHF " }, { "label": "b", "text": "UHF " }, { "label": "c", "text": "HF " }, { "label": "d", "text": "Microwave " }] }, { "number": "6", "question": " An electromagnetic wave consists of ____________. ", "correct": "a", "answer": [ { "label": "a", "text": "Both electric field and magnetic field " }, { "label": "b", "text": " An electric field only " }, { "label": "c", "text": "A magnetic field only " }, { "label": "d", "text": " Non-magnetic field only " }] }, { "number": "7", "question": " What causes tropospheric ducting of radio waves? ", "correct": "d", "answer": [ { "label": "a", "text": "A very low pressure area " }, { "label": "b", "text": "An aurora to the north " }, { "label": "c", "text": " Lightning between the transmitting and receiving antenna " }, { "label": "d", "text": "A temperature inversion " }] }, { "number": "8", "question": " What causes the ionosphere to absorb radio waves? ", "correct": "b", "answer": [ { "label": "a", "text": "The weather below the ionosphere " }, { "label": "b", "text": " The ionization of the D region " }, { "label": "c", "text": "The presence of the ionized cloud in the E region " }, { "label": "d", "text": " The splitting of the E region " }] }, { "number": "9", "question": " Which ionospheric region is closest to the Earth? ", "correct": "c", "answer": [ { "label": "a", "text": " A region " }, { "label": "b", "text": " E Region " }, { "label": "c", "text": "D region " }, { "label": "d", "text": " F region " }] }, { "number": "10", "question": " What causes the VHF radio waves to be propagated several hundred miles over oceans? ", "correct": "d", "answer": [ { "label": "a", "text": " An overcast of cirriform clouds " }, { "label": "b", "text": " A high pressure zone " }, { "label": "c", "text": " A polar air mass " }, { "label": "d", "text": " A widespread temperature inversion " }] }, { "number": "11", "question": "Troposheric scatter radio ", "correct": "d", "answer": [ { "label": "a", "text": " Uses molecules in the Earth’s troposphere to scatter some radio energy back to Earth " }, { "label": "b", "text": "Has a limited capability for data transmission " }, { "label": "c", "text": "Is not widely used commercially " }, { "label": "d", "text": "All of the above " }] }, { "number": "12", "question": "Sky wave cannot be 'heard' ", "correct": "c", "answer": [ { "label": "a", "text": "Close to the transmitter " }, { "label": "b", "text": "Far from the transmitter " }, { "label": "c", "text": "In the silent zone " }, { "label": "d", "text": "In the skip zone " }] }, { "number": "13", "question": " The absorption of radio waves by the atmosphere depends on ", "correct": "a", "answer": [ { "label": "a", "text": "Their frequency " }, { "label": "b", "text": "Their distance from the transmitter " }, { "label": "c", "text": "The polarization of the wave " }, { "label": "d", "text": "The polarization of the atmosphere " }] }, { "number": "14", "question": " The largest frequency that will be returned to the Earth when transmitted vertically under ionospheric conditions is called the ", "correct": "a", "answer": [ { "label": "a", "text": " Critical frequency " }, { "label": "b", "text": "Optimum Working Frequency (OWF) " }, { "label": "c", "text": " Maximum Usable Frequency (MUF) " }, { "label": "d", "text": " Skip zone " }] }, { "number": "15", "question": " As electromagnetic waves travel in free space, only one of the following can happen to them: ", "correct": "c", "answer": [ { "label": "a", "text": "Absorption " }, { "label": "b", "text": "Reflection " }, { "label": "c", "text": " Attenuation " }, { "label": "d", "text": "Refraction " }] }, { "number": "16", "question": " What is the period of the solar cycle in which great electrical disturbance will occur? ", "correct": "c", "answer": [ { "label": "a", "text": " Every 11 years " }, { "label": "b", "text": " Every 4 years " }, { "label": "c", "text": " Every 5 years " }, { "label": "d", "text": "Every 10 years " }] }, { "number": "17", "question": "Ducting occurs in which region of the atmosphere? ", "correct": "c", "answer": [ { "label": "a", "text": " F2 " }, { "label": "b", "text": "Stratosphere " }, { "label": "c", "text": " Troposphere " }, { "label": "d", "text": " Ionosphere" }] }, { "number": "18", "question": " What is the significance of the sunspot number with regard to HF propagation? ", "correct": "c", "answer": [ { "label": "c", "text": " Lower sunspot numbers generally indicate greater probability of sporadic E propagation " }, { "label": "b", "text": " A zero sunspot number indicate radio propagation is not possible on any band " }, { "label": "c", "text": " Higher sunspot numbers generally indicate a greater probability of good propagation at higher frequencies " }, { "label": "d", "text": "All of these choices are correct. " }] }, { "number": "19", "question": "What effect does a Sudden Ionospheric Disturbance have on the daytime ionospheric propagation of HF radio waves? ", "correct": "a", "answer": [ { "label": "a", "text": " It disrupts signals on lower frequencies more than those on higher frequencies " }, { "label": "b", "text": "It enhances propagation on all HF frequencies " }, { "label": "c", "text": " It disrupts communications via satellite more than direct communications " }, { "label": "d", "text": " None, because only areas on the night side of the Earth are affected " }] }, { "number": "20", "question": " What causes HF propagation conditions to vary periodically in a 28 day cycle? ", "correct": "c", "answer": [ { "label": "a", "text": "The position of the Moon in its orbit " }, { "label": "b", "text": "The position of the Moon in its orbit " }, { "label": "c", "text": " The Sun’s rotation on its axis " }, { "label": "d", "text": "The position of the Moon in its orbit " }] }] }`;