Answer:
1 = False - Using your back with to heavy objects can cause spinal damage or severe cramps. Knees are easier and to not take damage cause there use to carrying stuff such as you!
2 = False - This is very dangerous and can cause damage to parts of your body that could potentially be fatal or permanent.
3 = True - Worker compensation is what it is called you can see ads about this to!
4 = False - If anything the amount of errors has increased or stayed the same. You could miss-type something on the keyboard causing an error.
5 = True - This will protect you from permanent injuries or fatalities.
~LadyBrain