In the first mishap, six persons were killed and 14 others injured when two jeeps collided near Mehrana village in Bikaner.
Vehicular movement was affected for a short while on Bikaner-Sri Ganganagar road following the incident.
The deceased included a woman, police said, adding that the injured were rushed to hospitals in Lunkaransar town and Bikaner city.
In Jaipur, three men were killed and as many injured when a tempo rammed into a stationary truck near Daulatpura area.
Kanaram Khateek (35) was changing the tyre of the stationary truck when it was hit this morning, police said.
While Khateek was crushed to death, Ratan Kumar (43) and Sanjay (20), who were sitting in the truck at the time, were also killed.
Three persons, who sustained injuries, have been admitted to a hospital, officials said.