answer:The word “more” is used when you want to tell the reader that there’s a greater degree of something in comparison. For example, in your sentence “People who have completed engineering have more chances of getting selected,” you are saying that people who have completed engineering have more chances of getting selected than “people who have not” completed engineering. Your use of “much” in both sentences is grammatically incorrect. It’s not correct to say “I think compared to java, PHP has much demand.” When you’re comparing the two, you should use the word “more” and say “I think compared to java, there is more demand for PHP.” Use “more” when you’re comparing two things. If you use the word “much”, write two separate sentences, like this—- “There is much demand for PHP. I think compared to java, there is more demand for PHP.” Or, you can write “I think compared to java, there is much demand for PHP.” Instead of writing “PHP has much demand,” you need to re-arrange the sentence and add “there is” and “for”. Grammatically, that’s okay, but you are not saying that there is a “greater” demand for PHP. You are only telling the reader that there is a lot of demand for PHP. In the first sentence, you are telling the reader that there is a lot of demand for PHP, you are not “comparing” it to something else. You are quantifying it. In the second sentence, you are comparing two things, so the use of “more” is appropriate. In your sentence about engineering, it is not grammatically correct to say “People who have completed engineering have much chances of getting selected.” Instead, you should say “People who have completed engineering have MANY chances of getting selected,” or “People who have completed engineering have a lot of chances of getting selected.” Your other sentence, “People who have completed engineering have more chances of getting selected” is grammatically correct. You can write it like that and leave it, or if you want to compare it to something else, write “People who have completed engineering have more chances of getting selected than people who have not.” Again, always use “more” when comparing, and “much” when telling the reader the amount of something.