Test Preparation on Electromagnetic Wave and Communication-I-Physics Test Series For NEET 2020
1.
In short wave communication, waves of which of the following frequencies will be reflected back by the ionospheric layer, having electron density 1011 per m3
2.
A signal of 5 kHz frequency is amplitude modulated on a carrier
wave of frequency 2 MHz. The frequencies of the resultant
signal is/are
3.
A laser beam of pulse power 1012 watt is focussed on an object of area 10-4 cm2. The energy flux in watt/ cm2 at the point of focus is
4.
The carrier frequency generated by a tank circuit containing 1 nF capacitor and 10 μH inductor is