Answer : The correct option is, It would float.
Explanation :
As we know that the density of water is, 1 kg/L.
The given density of block is, 0.500 kg/L.
- When the density of a substance will be greater than the density of water then the substance will sink in the water.
- When the density of a substance will be lesser than the density of water then the substance will float in the water.
As per question we conclude that, the density of substance (block) is less than the density of water. So, the block will float in the tank of water.
Hence, the correct option is, It would float.