Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?

1. Pauli's exclusion principle

2. Heisenberg's uncertainty principle

3. Hund's rule of maximum multiplicity

4. Aufbau principle

A ball weighing 10 g is moving with a velocity of 90 ms^–1. If the uncertainty in its velocity is 5 %, then the uncertainty in its position is  X × 10^–33 m. The value of X will be :

[Given : h = 6.63 × 10^–34 Js]

1. 1.17

2. 1.37

3. 1.67

4. 1.97