The number of subsets of $\{1, 2, 3, \ldots, 9\}$ containing at least one odd number is

The thermo emf of a thermocouple is given by $E = aT + bT^2$,where $\frac{a}{b} = -200^{\circ}C$. If the cold junction is kept at $30^{\circ}C$,then the inversion temperature is ($\varepsilon$ in volt,$T$ in centigrade). (in $K$)

If the peak value of the magnetic field of an electromagnetic wave is $30 \times 10^{-9} \ T$,then the peak value of the electric field is (in $Vm^{-1}$)

If $\frac{x-4}{x^2-5x+6}$ can be expanded in the ascending powers of $x$,then the coefficient of $x^3$ is

If $g(x) = \int_0^x \cos^4 t \, dt$,then $g(x + \pi)$ equals

$A$ satellite is revolving very close to a planet of density $\rho$. The period of revolution of the satellite is