Yes, we always put the nouns after these words(сколько, много, мало, несколько, большинство и меньшинство) in the genitive plural. When the nouns are countable, they stand in the Genitive Plural (сколько вопросов), when uncountable, in Genitive Singular (сколько воды) — like in English, I guess (how many questions/how much water).