Environment and health

What is the aim of environmental health studies?

• Promote global warming awareness

• Improve transportation systems

• Eliminate factors hazardous to health through environmental control

• Increase agricultural production

Which of the following is considered a biological component of the environment?

• Air

• Water

• Bacteria

• Noise

Which of the following is NOT a source of groundwater?

• Deep wells

• Shallow wells

• Ponds

• Springs

What is the best method for household water purification?

• Filtration only

• Boiling

• Chlorination only

• Reverse osmosis

Which chemical is used in household water disinfection?

• Vinegar

• Bleaching powder

• Carbon dioxide

• Ammonia

Which is a characteristic of hard water?

• High sugar content

• Pleasant taste

• Bright color

• Hair fall and soap wastage

Which compound causes temporary hardness in water?

• Calcium bicarbonate

• Calcium sulfate

• Magnesium sulfate

• Ferric chloride

Which method is used to remove permanent hardness in water?

• Base exchange process

• Sedimentation

• Filtration

• Boiling

What is the recommended limit of fluoride in drinking water?

• 0.1 mg/L

• 0.5 mg/L

• 1.5 mg/L

• 3.0 mg/L

What is a non-auditory effect of noise pollution?

• Hearing loss

• Buzzing in the ears

• Deafness

• Interference with speech