[PPSC Principal, HM and BPEO, 2020]
31. The most powerful eye irritant present in smog is
Ozone
Nitric oxide
Peroxyacetyl nitrate
Sulphur dioxide
32. In olden days when refrigerators did not exist, it was customary to boil milk twice or thrice in a day to prevent it from becoming sour, the reason being
Denaturation of the milk protein, casein
Killing lactobacilli that convert milk into curd
Pasteurization of milk
All of the above
33. Xerophthalmia is caused by the dietary deficiency of
Protein
Vitamin A
Riboflavin
Unsaturated fatty acids, linoleic and linoleic acids
34. DDT, an organochlorine compound, used first to control malaria, carried in mosquitoes and later to a variety of insects/pests, is now banned because
It brings about a change in sex chromosomes
It persists in the environment and bio accumulates
It increases its affinity hundred fold for haemoglobin preventing its coupling with oxygen
35. Silicosis is a
Kidney disease
Liver disease
Lung disease
Neurological disorder