On what factors does the force $F$ required to maintain the flow of layers in a liquid depend?

Under the same conditions of pressure and temperature,the same volume of two gases $A$ and $B$ diffuse through a porous partition in $20 \ s$ and $10 \ s$ respectively. The molecular mass of $A$ is $49 \ u$. The molecular mass of $B$ will be ............. $u$.

Which one of the following statements is wrong for gases?

How will the viscosity of a liquid be affected by an increase in temperature?

The total pressure of a mixture of two gases is equal to .......

$X \ mL$ of $H_2$ gas effuse through a hole in a container in $5 \ seconds$. The time taken for the effusion of the same volume of the gas specified below under identical conditions is