Can the dip at a place be (a) zero (b) `90^@`?

The angle of dip at a place on the earth gives

The true dip at a place is 30^(@) . What is the apparent dip when the dip circle is turned 60^(@) out of the magnetic meridian ?

At a certain place, the horizontal component of the earth's magnetic field is B_(0) and the angle of dip is 45^(circ) . If the total intensity of the field at that place is sqrt(alpha) B_(0) , then find alpha^(circ)

If the angle of dip at two places are 30^(@) and 45^(@) respectively, then the ratio of horizontal components of earth's magnetic field at the two places will be

A dip circle shows an apparent dip of 60^@ at a place where the true dip is 45^@ . If the dip circle is rotated through 90^@ , what apparent dip will it show?

The true dip at a place is 30^@ but a dip circle at that place shows an apparent dip of 45^@ . If the dip circle is now rotated through 90^@ , what will be the new apparent dip?