Jadu Ka Shankh (1974)

Shyam and Soni live with their mother in a village. They are very poor. The children give away the only bread piece to a hungry saint, who in turn gives them a magical conch. The children somehow discover that the conch reveals something foul concerning the listener. While patrolling, the disguised king reaches the kids and the children give the conch to him, requesting to pass it to the king, saying that this is magical. The king, using the conch, finds that his cousin wants to poison him. The king reaches his palace and confirms the plot against him and punishes the culprits. The king sends jewelery, garments, sweets, fruits etc for the kids and punishes the moneylender, and comes to take them along. The message "Good deeds do not go unrewarded".