The ratio of tension $T_1$ and $T_2$ is (strings are massless)

Two blocks of masses $1 \mathrm{kg}$ and $2 \mathrm{kg}$ are connected with massless spring as shown. If the acceleration of $1 \mathrm{kg}$ block is $1 \mathrm{m} {\mathrm{s}}^{-2}$ towards right then the acceleration of $2 \mathrm{kg}$ block is

The value of frictional force on block in the given diagram is (Take $g=10 \mathrm{m} {\mathrm{s}}^2)$

If block is at verge of motion, then select the correct option (where $\mathrm{\mu }$ is the coefficient of friction)

The minimum value of coefficient of friction $\left(\mathrm{\mu }\right)$ such that block of mass $\text{'}5 \mathrm{kg}\text{'}$ remains at rest is

If the coefficient of friction between the block of mass $5 \mathrm{kg}$ and wall is $0.5,$ then minimum force $F$ required to hold the block with the wall is $\left(g=10 \mathrm{m} {\mathrm{s}}^{-2}\right)$