Q codes and abbreviations are very useful when communicating with CW (Morse code) particularly if you are communicating with someone who is not fluent in English. The Q codes and abbreviations given here are used internationally. These codes and abbreviations also save time; it is quicker to send "QRM" than "I am getting interference from other stations". They are also used when communicating by standard telephony (talking into a microphone); the same advantages exist. Please don't worry about learning all these codes, with time you will come to know and use them all, but for the purposes of the exam I have suggested which ones you should memorise.
QRA What is the name or callsign of your
QRB How far approximately are you from my station?
QRD Where are you bound and where are you from
QRG Will you tell me my exact frequency?
QRH Does my frequency vary?
QRK What is the readability of my signals(l-5)?
QRL Are you busy?
QRM Are you being interfered with? - Man-made interference
QRN Are you troubled by static? - Atmospheric noise
QRU Have you anything for me?
QRV Are you ready?
QRW Shall I tell that you are calling him on channel ?
QRY What is my turn?
QRZ Who is calling me?
QSA What is the strength of my signals (1-5)?
QSB Is my signal fading?
QSL Can you acknowledge receipt? - Acknowledged
QSO Conversation on the air.
QSW Do you wish to transmit on this frequency?
QSX Will you listen to on channel?
QSY Shall I change to another frequency? - Changing frequency
QTE What is my bearing from you?
QTH What is your position in latitude and longitude? - location
QTI What is your course?
QTJ What is your speed?
QTL What is your heading?
QTK What is the exact time?
QTU What are the hours during which your station is on air?
QTX Will you keep your station open for further transmissons?
QUA Have you news of...?
QUD Have you received the urgent signal sent by...?
QUF Have you received the distress signal sent by?