Channels Comparison Multiple Choice Questions (MCQs) PDF Download - 124

First communication satellites used frequencies of

1. 6 GHz for uplink
2. 3 GHz for uplink
3. 6 GHz for downlink
4. 5 GHz for downlink

When an electron is moving horizontally between oppositely charged plates, it will move in the

1. straight line
2. fall directly downwards
3. move towards positive plates
4. curved path

At threshold voltage, resistance of diode

1. decreases
2. increases
3. remains constant
4. varies depending on the direction of voltage

Bernoulli's principle shows that, at points in a moving fluid where the potential energy change is very small

1. the pressure is low where the velocity is low and similarly, the pressure is high where the velocity is high
2. the pressure is low where the velocity is high and conversely, the pressure is high where the velocity is low
3. pressure becomes independent of the velocity of the moving fluid
4. pressure remain independent of the speed of the stationary fluid

Temperature can't be lower than

1. 0 °C
2. 0 °F
3. 0 K
4. 0 °R