Are these true or false?

Question

1. If s is negative, then the square root of s^2 is -s.
2. If r is positive, then the square root of r^2 is -r.
3. If q is negative, then the square root of q^2 is q.
4. If p is positive, then the square root of P^2 = p.
If possible, kindly give me examples so that I can fully understand the concept.

Answer 1

√4 = 2
√n is always positive

So, what do you think?
1 T
2 F
...