Question

Unvented heaters in bathrooms and sleeping rooms:
1. are good aesthetically and for the human health
2. cause asphyxiation, carbon monoxide poisoning and death
3. do not affect human health
4. improve the efficiency of the heater

Answer 1

Correct Answer - Option 2 : cause asphyxiation, carbon monoxide poisoning and death

Explanation: 

Heaters produce carbon monoxide into the atmosphere, if heaters are unvented then carbon monoxide is accumulated in bathrooms and sleeping rooms which causes asphyxiation (deficient supply of oxygen to the body) and carbon monoxide poisoning and death.