In the holy Quran, paying zakat has been mentioned at 32 places whereas khums is mentioned once only however maulanas stress more on khums.
What do you say?

First of all I wish to tell you that the term zakat used in Quran is a vast term and can be taken in two meanings; general and specific. In general term, zakat belongs to any kind of charity and help to poor and needy people and it may be obligatory or recommended but zakat in a specific term is used only for obligatory charity which has it's own terms and conditions; those are mentioned in "Tauzeehul Masail". Zakat is obligatory on nine things, in which Gold and silver are completely excluded in this era due to it's term and conditions in our fiqh and the others things are dependent to have an immovable property like agricultural land or orchard and a few other things are dependent upon having animal husbandry etc. Therefore obligatory zakat doesn't relate to or become obligatory for general public rather khums belongs to the general public domain comparatively to the obligatory zakat because it becomes obligatory on money saving at the end of every year. Therefore it's generally more emphasized to pay by people even though it's mentioned only once in the Holy Quran. Apart from it, Khums has basically six parts, Three of them are for Allah, Holy Prophet (pbuh) and his progeny (pbut) and the other three parts are peculiar for a very poor class of the comuunity, traveler and orphans. So the first three parts of khums now belong to the master of our time (a.j.) and in his absence to his general representatives (Maraje) and our maraje spend it in socio-religious activities to make firm and save the foundations of religion. Yes of course, it should be emphasized to pay the recommended zakat (like mustahab sadqa) and generally people are already doing this by their own interest Alhmdulillah. so Ulama don't feel a need to emphasize on recommended deed as much as obligatory deed like khums.

1) Is it a must to recite Quran loudly or we can recite in our heart?
2) In winters can we wipe/dry our hands after wazoo

1) It's necessary to recite Quran at least in a way that the holy words of Quran must be pronounced and the volume of voice should be so much high that the reciter can hear himself his words otherwise it will not be considered recitation "qera'at" as this is very obvious by the word recitation itself. So if a person wants to take the reward of recitation he must recite it by vocal expressions not only in heart but if a person just recites the verses in heart he will get the reward of looking toward Quran or memoirizing it.
2) We can wipe/dry our face and hands after wuzoo in any season including winter but it's famous among Jurists that this is makruh. Therefore almost all foqaha consider it makruh except a few maraje like Ayatollah khamenai says that if a person keeps a special towel for drying the water of wuzoo then it is permissible.

At times we are at a place eg someone's funeral or qurankhawani, can Quran be read silently without making sounds

In this type of situation, you should recite with such volume so that you can hear yourself not so loudly that others may be disturbed.

Can I offer my prayers in front of the heater on. someone said it is fire parastish

Offering prayer in front of fire (it should be a natural fire itself not a heating equipment like heater) is disliked (makruh) not haram so there is no issue in offering salah in front of a heater switched on and it will not be considered as a fire worship.

If parents are sick, is it the duty of son or daughter to take care of her when her husband says its boys who have to take care of parents. What to do?

If your parents need your help in any situation you must help them as much as you can. This duty is not only for boys or girls but it's for both.

Whatever doa I do in namaz, I do in my heart or at times while going somewhere, I recite doa in my heart. Is that ok? Will it reach to God as 'Wo dilon kay bhaid jaanta hai'

Yes of course, Allah knows also whatever passes in our hearts but try to put forward your supplications with your own words towards Allah (SWT). May Allah bless you with more taufeeqat.

Kya woh gaana sunna jayez hai jisme music ya koi bhi instruments use na kiya gaya ho sirf insaan ki awaz ho?

Aagar gane ke bol aur jumle aise hon jo gaane bajane ki mahfilon se makhsoos hon ya unse Insan ki shahwat (Sexual desires) bhadkati hon to sunna jaez nahi hai

Kabhi kabhi paer (foot) ka masah krte waqt meri ungli meri chappal me touch ho jaati hai toh kya isse mera wuzu sahi hai ya nahi

Sahi hai albatta agar sawal aur clear karke poocha jaye to jawab dene me asani hogi

Mere saath ek masla ho raha hai ki mere paet (stomach) me zor padhne se ya chhikne se mera ek qatra peshab nikal jata hai toh mujhe kisi ne bataya ki agar uss peshab me control nahi tha toh paak hai. Iss baat ko confirm krne ke liye mai apse yeh puch raha hu.

Agar ye ek beemari hai to aap uska ilaj karen aur us waqt tak use har baar paak karen jab tak treatment chalta rahe. Albatta agar ilaj karne ke baad bhi koi fayda na ho aur ek la ilaaj aur out for control marz ban jaye to usme apko baar baar paak karne ki zaroorat nahi hogi kyonki usme aap mashaqqat aur sakhti me mubtala ho jayenge. Us condition me kya karna hoga, kab aur kitni baat tahrat karna hogi iske liye apne marja-e-taqleed se sawal kijiye lekin aisi koi ruling Islam me nahi hai ki ek ya do baar ya kabhi kabhi out of control ho jane ki wajah se jo peshab choot jaye wo paak maana jata hai.

1. Istibra kya hota hai?
2. Kya yeh wajib/farz hai?
3. ise karne ka tariqa kya hai?

Ruling 69. Istibrāʾ is a recommended (mustaḥabb) act performed by men after urinating in order to be confident that no urine is left in the urethra. It is performed in a number of ways; one way is as follows: after urinating, the anus is first purified if it has become impure; then, the middle finger of the left hand is slid three times from the anus up to the scrotum; then, the thumb is placed on the penis and the forefinger is placed under the penis, and the thumb and forefinger are pulled three times along the penis up to the point of circumcision; finally, the end of the penis is pressed three times.

جواب: استبراء ایک مستحب عمل ہے جو مرد پیشاب کے بعد انجام دیتا ہے تا کہ اسے یہ اطمینان حاصل ہو جائے کہ پیشاب کی نلی میں کوئی قطرہ باقی نہیں ہے۔ یہ مختلف طرح سے ہو سکتا ہے جس میں سے ایک طریقہ یہ ہے کہ پیشاب کرنے کے بعد اگر پاخانہ کا مقام نجس ہو تو پہلے اسے پاک کرے، پھر تین بار بائیں ہاتھ کی درمیانی انگلی سے پاخانہ کے مقام سے آلت کے آخر تک کھینچے، پھر انگوٹھے کو آلت کے اوپر سے اور دوسری انگلیوں میں سے کسی ایک کو نیچے رکھ کر آخر تک کھینچے اور ختنہ گاہ کو تین بار فشار دے۔