The complex $[Pt(py)(NH_3)(Br)(Cl)]$ will have how many geometrical isomers?

If force $F$ is increasing with time and at $t=0, F=0$,where will slipping first start?

Venus appears brighter than other stars because

On stretching a wire,the elastic energy stored per unit volume is

$A$ prism of refractive index $\mu$ and angle $A$ is placed in the minimum deviation position. If the angle of minimum deviation is $A$, then the value of $A$ in terms of $\mu$ is :

The figure shows a rough sketch of a meter bridge. The galvanometer $(G)$ shows zero deflection at a length $\ell \, cm$. Now,$R_1$ and $R_2$ are interchanged,then the balancing length increases by $25 \, cm$. Find the ratio $R_1/R_2$.