The torque of the weight of any body about any vertical axis is zero. Is it always correct?

Where does the weight of a body become zero?

A simple pendulum of length l is pulled aside to make an angle theta with the vertical. Find the magnitude of the torque of the weight w of the bob about the point of suspension. When is the torque zero?

When body is weighted on an ordinary balance we demand that the arm should be horizontal if the weights on the two pans are equal. Suppose equal weights are put on the two pahns, the arm is kept at an angle with the horizontal and released. Is the torque of the two weights about the middle point (point of support) zero? Is the total torque zero? If so, why does the arm rotate and finally become horizontal?

If the resultant torque of all the forces acting on a body is zero about a point is it necessary that it will be zero about any other point?

A body is in translational equilibrium under the sctin of coplanar forces. If the torque of these force is zero about a point is it necessary that it will also be zero abut any other point?

A particle of mass m is projected with speed u at an angle theta with the horizontal. Find the torque of the weight of the particle about the point of projection when the particle is at the highest point.

The movement of a body about its own axis like a rotating top is linear motion.

Does ozone depletion bring about any serious issues. If yes, list them.