Such tests can play the same role as the famous FizzBuzz test - to quickly filter out obviously unfit candidates without spending much resources. But this is usually fit for very big companies that hire a lot of people, sometimes without proven experience, and have somehow to reduce costs of that.
The between the lowest and highest score I ever received on an IQ test is 45 points. That really doesn't sound like an objective measure of anything much (The lowest was when I was stressed, running on no sleep, the test was sprung on me with no warning and had US cultural aspects when I'm from the UK - things like talking about quarters and dimes. The highest was when I had practiced math & logic problems to win a bet that I couldn't add ten points to my IQ :-)
I find the idea of anybody using an IQ test as a factor in employment laughable. As far as I'm concerned any company using an IQ test is hanging a big red sign on the front of their organisation that says "we don't understand what kind of employees we want".