Jim Cramer tackled the issue of low oil prices when answering viewers' questions from the floor of the New York Stock Exchange Thursday. Cramer, who's portfolio manager for Action Alerts PLUS and host of CNBC's  "Mad Money," said at current price levels, there won't be big bankruptcies among U.S. oil companies. But he did point to a column in Real Money onChesapeake Energy (CHK) - Get Report that investors should read. 

Cramer was asked if low oil prices will help airlines like Delta (DAL) - Get Report and United (UAL) - Get Report , and he said that he's a believer in Delta, but noted that Southwest (LUV) - Get Report just reported earnings that reflected price competition. 

Switching gears, Cramer said he believes Dow Chemical (DOW) - Get Report and DuPont (DD) - Get Report will announce a definitive merger deal this week. Action Alerts PLUS owns Dow Chemical, and Cramer said he still needs to decide what to do with that stock

In response to a viewer's question about how the deal might impact Cytec (CYT) , Cramer said that's not a stock he cares about. 

Cramer also commented on the news that Yahoo! (YHOO) is abandoning plans to shed its stake ofAlibaba (BABA) - Get Report , saying he  had wanted Yahoo! to make some big acquisitions. Instead, Cramer said, "They sat on their cash, and that's the problem."

Several viewers asked about retailers. Regarding Lululemon (LULU) - Get Report , Cramer said a Real Money Pro story by Carleton English looks at inventory problems at the company, along with potential inventory problems at Under Armour (UA) - Get Report and Columbia Sportswear (COLM) - Get Report . He said to be "very careful" about the stocks, and said the same about J.C. Penney (JCP) - Get Report .

A viewer asked whether to take profits inGeneral Electric (GE) - Get Report or hold for the long term. Cramer called GE the premier industrial company in the world and said not to sell the shares.

Another viewer asked about Johnson Controls (JCI) - Get Report , which Cramer said was a tougher stock to talk about, because he likes the company but thinks that auto sales may be peaking.

Cramer was asked for his latest thoughts on Twitter (TWTR) - Get Report , which is owned by Action Alerts PLUS. He thinks things are improving longer term at Twitter, but doesn't look for instant results.

Cramer also discussed bank stocks, saying he's adding shares of Bank of America (BAC) - Get Report .

On cybersecurity, he said FireEye (FEYE) - Get Report is still in the penalty box, and he likes a piece written at JPMorgan about why CyberArk (CYBR) - Get Report should be bought.  Finally, Cramer was asked about Kroger (KR) - Get Report and said that's a stock to hold onto.

Send your questions to Cramer via social media.  You'll find him on Facebook (FB) - Get Report , and on Twitter, he's @jimcramer. For Twitter questions, use hashtag #CramerQ.

At the time of publication, Jim Cramer's charitable trust Action Alerts PLUS was long BAC, DOW, FB and TWTR.