401: What was the call of the Pentagon in the late 40's and early 50's before "K" calls were issued to amateurs?  

402: What well known movie star also invented "spread spectrum" communications?    

403: Years ago, instead of using a dummy load, some amateur stations used one of the following to check the tuning of their transmitter.  

404: The now-defunct FCC "Conditional Class" license granted what privileges? 

405: Crystals could be ground to change their frequency.

406: What was the length, of the term, for the original FCC Novice license?  

407: The original FCC Novice license allowed the use of either crystals or VFO.

408: At one time, the FCC issued a license based on testing administered by volunteers, and granted the same privileges as the General Class, for those who were located a certain distance or more from an FCC field office. What was this license called?  

409: When the FCC introduced the "Advanced Class" license, a new Morse code test was required for upgrading General Class holders, even though the required code was the same as the General Class, 13 WPM.

410: What is the minimum age allowed to apply for an FCC amateur radio operator license?  

411: What is the longest length that an amateur radio "mobile antenna" can be?

412: The FCC places no restrictions on the height of fixed amateur radio antennas.

413: When was QST first published?

414: If you are sending CW at a speed faster than the other ham in a QSO, the considerate thing to do is:  

415: Before the FCC went to "incentive licensing" in 1967, the "Extra Class" license granted "extra privileges" than the General Class license.  

416: Before the FCC instituted "incentive licensing" in 1967, what additional privileges were granted to a holder of Extra Class over a holder of General Class?          

417: At short ranges, the best reception occurs when the transmitting antenna and receiving antenna are of the same orientation.  

418: The FCC limits the number of "fixed station" antennas an amateur radio operator may have.

419: The FCC may impose "quiet hours" on an amateur radio operator whose transmitting interferes with the AM radio reception of a neighbor.

420: In what year were US amateurs first licensed by the Federal Government?

421: When an OO (official observer) station notices an infraction, it should be reported directly to the FCC and the offending operator.

422: What items can an OO (official observer) be compensated for?

423: To whom does an OO (Official Observer) send his monthly report?    

424: A non-licensed person can talk over an amateur radio station, if a licensed operator is controlling the station.

425: In what year, did Marconi start working on his wireless idea?