Question

Regarding symmetry of simple cubical lattice which of the following is/are correct? (Single option correct)

a: It has total 23 symmetry elements

b: It contain 13 proper rotation axes of symmetry

с: It contain 9 plane of symmetry

d: All of the given are correct​

Answer 1

A lever is a rigid, straight or bent bar which is capable of turning about a fixed axis.

Principle: A lever works on the principle of moments. For an ideal lever, it is assumed that the lever is weightless and frictionless. In the equilibrium position of the lever, by the principle of moments,

Moment of load about the fulcrum = Moment of the effort about the fulcrum.

Answer 2

Answer:

d. all of the given are correct