1) Which ionization layer exists during day time & usually vanishes at night due to highest recombination rate?
a. D-region
b. Normal E-region
c. Sporadic E-region
d. Appleton region
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Answer
Explanation
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ANSWER: D-region
Explanation:
No explanation is available for this question!
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2) How is the effect of selective fading reduced?
A. By high carrier reception
B. By low carrier reception
C. By single side band system
D. By double side band system
a. A & C
b. B & D
c. A & D
d. B & C
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Answer
Explanation
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ANSWER: A & C
Explanation:
No explanation is available for this question!
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3) According to Secant law, which frequency is greater than critical frequency by a factor of secθi?
a. MUF
b. LUF
c. OWF
d. UHF
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Answer
Explanation
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ANSWER: MUF
Explanation:
No explanation is available for this question!
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4) If the maximum electron density for F-layer in ionosphere is 4 x 106 electrons/cm3, then what will be the critical frequency of EM wave for F-layer?
a. 4 MHz
b. 9 MHz
c. 18 MHz
d. 25 MHz
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Answer
Explanation
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ANSWER: 18 MHz
Explanation:
No explanation is available for this question!
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5) Which among the following plays a primary role in generation of conduction current in an ionosphere due to presence of electric field?
a. Ions
b. Motion of electrons
c. Neutral molecules
d. None of the above
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Answer
Explanation
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ANSWER: Motion of electrons
Explanation:
No explanation is available for this question!
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6) Which mechanism/s is/are likely to occur in mid-frequency operation corresponding to ionospheric region?
a. Only Reflection
b. Only Refraction
c. Partial reflection & refraction
d. None of the above
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Answer
Explanation
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ANSWER: Partial reflection & refraction
Explanation:
No explanation is available for this question!
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7) According to Snell's law in optics, if a ray travels from dense media to rarer media, what would be its direction w.r.t the normal?
a. Towards
b. Away
c. Across
d. Beside
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Answer
Explanation
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ANSWER: Away
Explanation:
No explanation is available for this question!
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8) F2 layer of appleton region acts as a significant reflecting medium for _____ frequency radio waves
a. Low
b. Moderate
c. High
d. All of the above
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Answer
Explanation
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ANSWER: High
Explanation:
No explanation is available for this question!
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9) What is the possible range of height for the occurrence of sporadic E-region with respect to normal E-region?
a. 20 km – 50 km
b. 45 km – 85 km
c. 90 km – 130 km
d. 140 km – 200 km
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Answer
Explanation
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ANSWER: 90 km – 130 km
Explanation:
No explanation is available for this question!
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