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is the CPI of RISC processor always 1?

RISC follows single cycle instruction execution technique. So yes CPI of RISC processors is always $1$.
ideally risc cpi is 1.

But as we know 100% efficiency is not possible always so depending upon type of instruction it may inc.

Because RISC contains only Load and Store instructions which involve memory and these instructions take only one Clock cycle and when it comes to arithmetic instructions, these involve only Registers. When instructions involve only Registers then those instructions are really fast and take at most one clock cycle. So Clock cylces Per Instruction is 1 for RISC processor

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