Answer
1) Same
2) Doubles
3) Doubles
Work Step by Step
The period is only dependent on the length of the pendulum and the gravitational constant. Thus, changing the mass does nothing. The period is directly related to the square root of the length, so quadrupling the length doubles the period. The period is inversely related to the square root of the gravitational constant, so 1/4 the gravitational constant doubles the period.
