Basic Question Words:
* कौन? (kaun?) - Who?
* क्या? (kya?) - What?
* कहाँ? (kahaan?) - Where?
* कब? (kab?) - When?
* कैसे? (kaise?) - How?
* क्यों? (kyon?) - Why?
More Specific Question Words:
* कितना? (kitna?) - How much? (for quantity)
* कितने? (kitne?) - How many? (for count)
* किस? (kis?) - Which? (for choice)
* किसका? (kiskaa?) - Whose? (for possession)
* किस तरह? (kis tarah?) - What kind? (for type)
* किस लिए? (kis liye?) - For what reason? (for purpose)
* किससे? (kisase?) - From whom? (for source)
* किसको? (kisko?) - To whom? (for recipient)
Examples:
* कौन आया है? (kaun aaya hai?) - Who has come?
* क्या तुम खाना खा रहे हो? (kya tum khaana kha rahe ho?) - Are you eating?
* कहाँ जा रहे हो? (kahaan ja rahe ho?) - Where are you going?
* कब आएगा? (kab aaega?) - When will he come?
* कैसे पहुंचे? (kaise pahunche?) - How did you reach there?
* क्यों रो रहे हो? (kyon ro rahe ho?) - Why are you crying?
* कितना पैसा है? (kitna paisa hai?) - How much money do you have?
* किसने कहा? (kisne kaha?) - Who said it?
Note:
* The question words are often followed by the word "है?" (hai?) at the end of a sentence, which means "is?" or "are?".
* The word order in Hindi questions can vary slightly depending on the sentence structure.
Let me know if you have any other questions!