Which of the following Gods is referred to as 'Ritasya Gopa' in the Rigveda?

Which one of the following is not related to the Rigvedic period?

Which of the following is a characteristic of Mandala IX of the Rigveda?

Which one of the following is oldest Veda :

Which of the following Rig-Vedic Gods is not mentioned in 'Boghazkoi' inscription?

Which one of the following Brahmana texts belongs to the Rigveda?