For Kazakhstan, who lost 0-8 to Malaysia yesterday, Vera Domashneva (2nd minute, 28th), Natalya Sazontova (38th) and Olga Khonina (43rd) scored the goals.
Singapore us yet to taste a victory in the tournament so far having lost 0-7 to Russia in their opening match at the Major Dhyan Chand National Stadium yesterday.
Kazakhstan coach Serik Kalimbayev has expressed relief after registering the win.
"Today we played with good technique and tactics. We tried not to leave any loopholes but we did a few mistakes and need to work on our penalty corners. We will try to keep the momentum going and keep scoring in the coming matches," he said.