A quart is a volumetric measuring unit, whereas a pound is a weight measurement unit. Without knowing the density of the questioned object, the two cannot be compared.
A quart is equal to 32 fluid ounces, while a pound is equal to 16 ounces. It may appear that one pound is equivalent to half a quart, but this is not the case. A quart measures volume, or how much space a substance occupies, whereas a pound measures weight, or how hefty an object is. Water is one of the few substances whose liquid volume is equivalent to its weight, as one quart of water weighs 32 ounces.