Which kind of isomerism is exhibited by octahedral $[Co(NH_3)_4Br_2]Cl$?

If $\int \frac{\sqrt{1-x^2}}{x^4} ~d x=A(x)\left(\sqrt{1-x^2}\right)^m+C$ for a suitable chosen integer $m$ and a function $A(x)$,where $C$ is a constant of integration,then $(A(x))^m$ equals

The circumference of a circle is measured as $56 \text{ cm}$ with an error of $0.02 \text{ cm}$. The percentage error in its area is

Which of the following will release hydrogen gas upon reaction with hydrochloric acid?

An inductor coil carries a steady-state current of $2.0 \, A$ when connected across an ideal battery of $emf \ 4.0 \, V$. If its inductance is $1.0 \, H$,find the time constant of the circuit in $sec$.

If $\cos \theta - 4 \sin \theta = 1$,then $\sin \theta + 4 \cos \theta$ is equal to