RADIO WAVES – Air – DGCA Question Bank For Politics

#1. A radio wave is:

an energy wave comprising an electrical field in the same plane as a magnetic field

an electrical field alternating with a magnetic field

an energy wave where there is an electrical field perpendicular to a magnetic field

an energy field with an electrical component

#2. The speed of radio waves is:

300 km per second

300 million metres per second

162 nm per second

162 million nm per second

#3. The plane of polarisation of an electromagnetic wave is:

the plane of the magnetic field

the plane of the electrical field

the plane of the electrical or magnetic field dependent on the plane of the aerial

none of the above

#4. If the wavelength of a radio wave is 3.75 metres, the frequency is:

80 KHz

8 MHz

80 MHz

800 KHz

#5. The wavelength corresponding to a frequency of 125 MHz is:

2.4 m

24 m

2.4 Cm

24 mM

#6. The frequency which corresponds to a wavelength of 6.98 cm is:

4298 GHz

4.298 GHz

429.8 GHz

42.98 GHz

#7. The frequency band containing the frequency corresponding to 29.1 cm is:

HF

VHF

SHF

UHF

#8. To carry out a phase comparison between two electromagnetic waves:

both waves must have the same amplitude

both waves must have the same frequency

both waves must have the same amplitude and frequency

both waves must have the same phase

#9. The phase of the reference wave is 110° as the phase of the variable wave is 315°. What is the phase difference?

205°

025°

155°

335°

#10. Determine the phase difference between the reference wave and the variable wave: (The reference wave is the solid line and the variable wave is the dashed line)

045°

135°

225°

315°

#11. The wavelength corresponding to a frequency of 15 625 MHz is:

1.92 m

19.2 m

1.92 Cm