Al-Qariah is one of the names of the Day of Judgement, like Al-Haqqah, At-Tammah, As-Sakhkhah others

Then Allah intensifies concern and fright for it by saying,

وَمَآ أَدْرَاكَ مَا الْقَارِعَةُ

Human Deeds, Good or Bad, will be Weighed

This Surah mentions the weighing of human deeds. He whose scales are heavy will be led to Paradise, and he whose scales are light will be led to Hell. Please see Ma’ ariful Qur'an, Vol. 3/ pp 539-547, for a full and complete analysis of the Weighing of human deeds. The analysis also allays the doubts raised against the concept of weighing of deeds.