Pupils faced with a strict teacher were more likely to rebel.
Children find teachers with stern voices to be less approachable.
A study from the University of Essex and University of Reading, showed "controlling sounding voices" didn't gain cooperation from 10-16-year-olds.
The research, involving of hundreds of children, found pupils faced with a strict teacher were more likely to rebel, and were less likely to reveal they were facing problems such as bullying.