Q: Will an oath be valid if it is made in the heart without uttering it?

Q: I needed to make fardh ghusal during a flight and I could not do ghusal. I could not find anything to do tayummum with. I made wudhu and prayed. Was that right or what should I have done?

Q: If a person omits salaah intentionaaly and does not pray it at the prescribed time, can he pray it as qazaa at the time of the next salaah or when the time of that prayer is finished?

Q: Suppose a person has several missed fasts and one broken fast. He knows that he has to pay kaffarah for broken fast but there is no kaffarah for missed fasts. Now can he make up the missed fasts at first and then the broken fast and kaffarah?

Q: Can women apply black colour dye? If not then what is the alternative method for getting black colour hair.

Q: Sometimes bad thoughts comes in my mind about my future mother in law. I haven't touched her just bad thoughts so could nikah be possible? 

Q:

1. Can a Muslim lady who is a widow and has a child from her first husband, enter into nikaah with a Muslim man without seeking permission from her father?

2. Can a Muslim married man, if he has the means, enter into nikaah with a Muslim woman without seeking permission from his existing wife?

Q: Is there an authentic hadeeth that states that one should not read witr in the same pattern that the fardh of maghrib is performed in? If so, please state the hadeeth with reference.

Q: My younger brother is jobless and has a wife and baby. I gave him money from my Zakaat so he can go to the Middle East to find work. It's been few months and he is still looking for a job and meeting his needs there by using zakaat money which I gave him. His wife is in her home country and needs some kind of financial support to meet her and the baby's needs. His wife has jewellery which is worth more than US$5,000. My question is that since my brother has no income to support her and his wife is a house wife, can I give Zakaat money to his wife so she can fulfill her needs along with baby's?

Q:

1. Is it necessary to follow anyone amongst 4 imams? Is there any ahadith? What was their ijthihad towards giving opinions on ahadith? Did four imams mention that "in case what they were doing is later found to be not correct then we should ignore them".

2. Why some Muslims believe that only two shahih hadiths are only hadith and rest hadith like Abu Dawood, ibn Maja, an nasai and tirmidhi are not correct hadith

3. Should every Muslim believe in all ahadith?