Read the annual report, monthly factsheet and/or prospectus, you can get this online or through PB agents. If you are not willing to find out or do not understand, don't simply buy. 

Do some homework, it will benefit you greatly with some financial knowledge. 

1 Public Capital Protected Select Portfolio Fund - closed on 11 September 2008
2 Public Islamic Opportunities Fund - closed on 09 November 2010
3 Public SmallCap Fund - closed on 05 May 2011
4 Public Islamic Bond Fund 15 June 2010
5 Public Islamic Sector Select Fund - closed on 29 November 2010
6 Public Bond Fund - closed 10 January 2011

2 funds from your 8 funds listed closed for new initial investment. FYI only. I am not about PB series. 

1. If the prices of fund drop, do I lose the money and do I need to keep pumping money whenever the prices of a unit trust drop?
+ if the NAV drops, the value of yr units drop
Thus, of course U lose $ (on paper which is as good as reality if redeemed at that point)

+No, U do not NEED to keep pumping in $ whenever the prices of a unit trus drop.
Who told U so? It's totally up to U.
Some ppl do that to do value averaging down. However, note that while they value average down, that unit trust MAY not go back up  .
Think of it like this:
a. if that unit trust invested in Enron & WorldComm only.
b. The prices of Enron & WorldComm dropped tremendously, thus the Unit trust invested in them falls as well.
c. U average down the Unit trust and keep buying as it falls
d. The prices of Enron & WorldComm becomes $0
e. The Unit trust NAV becomes $0
f. Congratulations  - no cost Unit trust 
Note: Having stated thus, i myself do periodic programmed value averaging (not just averaging down) in specific mutual funds for at least 3 years "program" per fund, based on Asset Allocation and filtered mutual funds for total returns (i want the volatility, thus focused on total returns) for 3, 5 and 10 yrs stats.
2. Why is it money will not lose even the prices of unit trust drop?
+Who said so? This universe or the next ar? Or U talking about those artificial unit trust by the Government, specially for certain segments of the rakyat?
If there is such an animal, please share the details and statistics. 0% of losing $ + unlimited % of upside = perfect, if there is such an animal 

Bro Nightzstar, U can lose 40% to 70% in unit trusts / mutual funds - just like stocks leh, assuming equity funds. 2008 - equity funds fell 40%+/-. So, it's NOT a few cents if U invested $1K at 2007 end, more like $400 to $600 

Bro, IMHO, if you're getting MORE confused as U learn at this stage, may be it's the things U THINK U are learning OR the sources... 

Anyways, U dont need to know in-depth about investing and investment vehicles, asset allocation, methodologies, etc. to go take the exam and license to be a UTC. U can just be a Sales Agent mar as many are 

Yup, main tembak pun dapat 20% to 25% (i cant recall A to E, or A to D  ) probability correct. Add cow sense = 50 / 50 + read a bit more = 75 / 25 lar