Basics of Polar Plot

Q. The polar plot of the transfer function $G\left(s\right)=\frac{10(s+1)}{s+10}for0\le \omega \le \infty$ will be in the

1. first quadrant
2. second quadrant
3. third quadrant
4. fourth quadrant

Q. The polar plot of
$G\left(s\right)=\frac{10}{s(s+1{)}^2}$
intercepts real axis at $\omega ={\omega }_0$. Then, the real part and ${\omega }_0$ are respectively given by:

1. $-2.5,1$
2. $-5,0.5$
3. $-5,1$
4. $-5,2$

Q. Which one of the following polar diagrams corresponds to a lag network?

1. 
2. 
3. 
4.