I would definitely suggest the Throne Vers, Sura 2, Vers 255 called -Ayat-ul-Kursi- as this Vers is described to be the most glorious Verse in the Qur'an.
When recited from the heart (means you know what you are saying) it protects the reciter and keeps him safe.
So if you recite it loudly, it will convince the one who questiones you that you know the Qur'an and at the same time you will be protected, inshaAllah.
Here is one of many stories how Ayat-ul-Kursi protected the reciter.
Benefits of the Ayat-ul-Kursi
It was reported in a local paper in Rochdale, of a young woman who was
raped in a small dark alley one evening.
On a separate evening around the same time, a young Muslim woman was
walking home from college. Aware that it was getting dark fast, she
wanted to get home as soon as possible, so her mother would not worry
about her being outside alone at night.
The young Muslim girl faced a dilemma. To take the short cut down the
same alleyway to avoid getting home after dark, or to take the longer
route and have her mother worrying herself sick about her safety.
Conscious of the time, she took the alleyway. While the girl was
walking down the alley, she saw a rather sinister,
threateningly dark figure of a man walking towards her from the other
As her pace quickened, she began to read Ayat-ul-kursi for her safety.
On passing, the man made eye contact, but carried on walking.
When the young Muslim girl reached home she told her family about this
sinister looking man. They advised her to contact the police, having
read the newspaper article some time before.
When she contacted the police, they asked her to give a physical
description of the man. It matched the description the rape victim had
Some days later the young Muslim girl received a phone call from the
police, asking her if she would go to the police station to identify
the man in a ‘line up’. Both the rape victim and the Muslim girl
picked out the same man. The police were confused though; they asked
the rapist why he had attacked one girl and not the other.
With reference to the Muslim girl, he replied: 'Why would I attack her
when she had two huge men walking on either side of her?'
On http://quranexplorer.com/Quran/ you can listen to the Verse and read the translation as well.
Transliteration is here:
Bismillahir Rahmanir Raheem
ALLAAHUH LAA ILAAHA ILLAA HUWA HAYYUL QAYYOOMO, LAA TAAKHUZUHU
SINATUN WALAA NAUM, LAHU MAA FIS SAMAAWAATE WA MAA FIL ARZ, MAN ZAL
LAZE YASH-FA-U' I'NDAHU ILLAA BE-IZNIH, YA'LAMU MAA BAYNA AYDEEHIM WA
MAA KHALFAHUM, WA LAA YOHEETOONA BE SHAYIM MIN I'LMEHI ILLAA BEMAA
SHAAA-A, WASE-A' KURSIYYUHU SAMAAWAATE WAL ARZ, WA LAA YA-OODOHU
HIFZUHUMAA, WA HUWAL A'LIYYUL A'ZEEM.
May Allah keep you always safe.