Related Questions

Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
A CO
B SO2
C NOx
D CFC (chloro fluoro carbons)
When we cut an onion, the vegetable emits an odour and our eyes tear up. Which of the following compounds is responsible for the tears and odour resulting from freshly cut onions?
A Ascorbic acid
B Sulphuric acid
C Citric acid
D Acetic acid
A 25 ml sample was diluted to 250ml with odourless distilled water so that the odour of the sample no longer perceivable. What was the Threshold odour number?
A 11
B 10
C 25
D 05
Conditions detectable by positive isotope bone scanning are
A Bone metastasis
B Paget's disease
C Hypertrophic osteoarthropathy
D Osteoporosis
E Multiple myeloma
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of :
A Evaporation
B Vaporisation
C Diffusion
D Sublimation
Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about __________ ppm.
A 1
B 50
C 5000
D 10000
Often visible as smog , ozone is formed in the atmosphere form" hydrocarbons and nitrogen oxides , two major pollutants emitted by automobiles react with sunlight .
A ozone is formed in the atmosphere from
B ozone is formed in the atmosphere when
C ozone is formed in the atmosphere when
D ozone is formed in the atmosphere ,and when
Choose the correct option to replace the quotation part of each sentence. Often visible as smog, 'ozone is formed in the atmosphere from' hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.
A ozone is formed in the atmosphere from
B ozone is formed in the atmosphere when
C ozone is formed in the atmosphere, and when
D ozone, formed in the atmosphere when
Can you smell an odour? The underlined word is
A verbs of perception
B cognate verb
C inchoative verb
D quasi-passive verb
If water smells bad, then that odour can be removed by adding
A alum
B bleach
C activated carbon
D deactivated nitrogen

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