The number of $\mathrm{\sigma }$bonds present in methane molecule is

The structure of Methane $\left({\mathrm{CH}}_4\right) molecules is$

This is formed by end on end overlapping of atomic orbitals of C and H atoms. End on end overlapping leads to form $\mathrm{\sigma } \mathrm{bonds}.$ Hence, number of $\mathrm{\sigma }$ bonds in Methane molecule is 4.