A dog swallows a ring, then is brought into a tent where a corpse is located. Is the ring impure?
Halacha 2: When a ring (or any item) is swallowed by a living creature and the creature enters a corpse-tent, the ring remains pure — swallowing provides full protection from the ohel's impurity.
Question 2
A dog swallows corpse flesh and then dies. After 2 days, is the flesh inside it still impure?
Halacha 4: After a dog dies, corpse flesh inside it remains impure for 3 full days (72 hours). For other animals, birds, and fish, only one day. After this time, if the flesh has been digested, it is pure.
Question 3
A ring is embedded in the mortar of a building floor. There is impurity in the house. Is the ring impure?
Halacha 6: Items embedded in the floor of an ohel (house) are impure — the floor is considered to extend the house's impurity all the way to the depths. Only a separate cubic handbreadth of airspace below them would create an independent structure.
Question 4
Two sealed jars each contain half an olive of corpse flesh and are placed in a house. Are the jars impure?
Halacha 8: Half an olive of corpse flesh does not reach the minimum measure to impart impurity. The jars are pure because their contents are below the threshold. The house itself is impure because combined (through the house's ohel) both half-olives equal a full olive.
Question 5
A covered drain has a handbreadth cubic opening inside the house but its external opening is less than a handbreadth. Impurity is in the drain. Is the house impure?
Halacha 7: For a drain to be considered independent (separate from the house), it needs a handbreadth cubic opening BOTH inside and outside. Without the outside opening meeting the threshold, the drain is not a separate structure, and its impurity extends to the house.