Question

1. A car uses digital logic to activate a seatbelt alarm. If the ignition is on for 20 seconds and seatbelt is unbuckled, which of the following is the correct truth table? Ignition Seatbelt Unbuckled X Timer Timer = 30s on Answer Ignition Timer X Seatbelt unbuckled 1 1 1 1 B С D 0 0 1 1 0 0 1 1 0 1 1

q1

q2

q3
pls, help me asap with this mcq, wrong solution give bad rate, tks in ads!

Answer 1

q1. Here,

The main purpose of Amitude modulation(AM) and Frequency Modulation (FM) is to transfer data by using carrier signal which should be modified and here different frequency waves are used means frequency can be changed means lower or higher. There is not necessary that frequency should be ultra high or high. So in that case

Option A is correct

q2. Here,

Transmission and chanelling are process in which one signal is send

Conductance is term opposite to resistance

Multiplexing is a process in which more than one analog and digital signal are combined to form one signal and then send

So option C is correct

q3. Here,

GPS is transmitting at 1575.42 MHz and 1227.60 MHz

Low frequency-30 to 300 KHz

Very high frequency-30 to 300 MHz

Ultra high frequency-300 MHz to 3 gHz

Extremly high frequency-30 to 300 GHz

So GPS is transmitted at ultra high radio wave frequency

So option C is correct