The order of the differential equation whose solution is $y = a \cos x + b \sin x + c e^{-x}$ is:

Which component of a lichen is heterotrophic?

$6 \Omega$ and $12 \Omega$ resistors are connected in parallel. This combination is connected in series with a $10 \text{ V}$ battery and a $6 \Omega$ resistor. What is the potential difference between the terminals of the $12 \Omega$ resistor (in $\text{ V}$)?

The lines $x-y-2=0$,$x+y-4=0$ and $x+3y=6$ meet at a common point:

What is the volume (in litres) of oxygen required at $STP$ to completely convert $1.5 \ mol$ of sulphur into sulphur dioxide?