Bhardwaj, who was a software engineer before he joined politics, claimed the EVM machines can be tampered with easily, and demonstrated on a mock machine.

Giving a step-by-step demonstration of the how the tampering is allegedly done, he said there are different codes to make anyone on the panel win, based on their position in the panel. After the BJP swept the polls in UP, opposition parties -- the BSP, Congress, AAP, SP and CPM -- claimed that the machines were tampered with.

Bhardwaj demonstrated that the vote tally is absolutely different from actual votes cast. He resets the machine with the code and demonstrates that the same EVM, which passed the mock test, could be manipulated during polls.

He said he spent 10 years working in this field and challenged any scientist to explain it to him.

Soon after assembly proceedings began, the BJP's Vijender Gupta was thrown out of the house for creating a ruckus; the Speaker called in marshals to evict Gupta, one of four BJP legislators in the house.

AAP, which dominates the 70-member assembly, fielded its Alka Lamba to bring up EVMs. The party has alleged that voting machines have been manipulated to help the BJP post massive wins in the Uttar Pradesh assembly polls and Delhi civic elections recently, which saw AAP decimated just two years after it swept assembly elections.

The party invited leaders of other parties like the Left, Trinamool Congress and Janata Dal United to watch its demonstration and they are seated in the visitors' gallery.

Chief Minister Arvind Kejriwal was in the House sitting alongside his deputy Manish Sisodia. Sacked Delhi minister Kapil Mishra, who has accused Kejriwal of corruption was also present.

Mishra has alleged that he saw Kejriwal take Rs 2 crore from another minister, Satyendar Jain, at his home last Friday and that "Jain has benefited close relatives of Kejriwal in illegal land deals.