Interrogative Pronouns
प्रश्नवाचक सर्वनाम
The interrogative pronouns appear generally similar to the relative pronouns (discussed earlier), but their role is the sentence is completely different.
Interrogative pronouns (प्रश्नवाचक सर्वनाम) दिखने में सम्बन्धवाचक सर्वनाम जैसे ही लगते हैं, पर वाक्य में इनकी भूमिका एकदम अलग है.

These are used to ask questions.
इन्हें प्रश्न पूछने के लिये प्रयुक्त किया जाता है.
Who are you?
What is the matter?
Whose is this pen?

of Pronoun