Q. Which amendment act of Parliament increased the strength of Lok Sabha from 525 to 545?
Answer: 31st
Notes: The strength of Lok Sabha was increased from 525 to 545 by the 31st Constitutional Amendment Act of 1973. The number of members to represent the states was increased from 500 to 525 and number of members to represent the UTs was decreased from 25 to 20.

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