The maximum polling of 37.46 percent was reported from Sri Ganganagar constituency while Jhunjhunu reported the lowest of only 21.91 percent till noon.
In 2009 Lok Sabha elections, the state recorded over 48.46 percent voter turnout.
Reports of problems in EVMs came in from some districts, where the machines were repaired or changed.
Earlier in the morning, polling started amid tight vigil by security forces.
"The voting began at 7 a.m. at over 38,220 polling stations spread in these 20 constituencies. We have made elaborate security arrangements for peaceful polls," an election official here told IANS.
