Related Questions

Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.
A 50
B 1000
C 5000
D 10000
From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
A 1
B 5
C 50
D 500
During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?
A Idle running
B Acceleration
C Cruising
D Deaccelaration
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be
A More
B Less
C Same
D Data insufficient; can't be predicted
শাকিলের প্রস্তুতকৃত দ্রবণের i. ppm একক হবে 40000 ppm ii. মধ্যে আরো 10 mL পানিযোগে সেমিমোেলারে পরিণত হবে iii. মধ্যে 6.02 × 1022 টি NaOH অণু রয়েছে নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
What is the primary standard level for carbon monoxide for assuring air quality?
A 10ppm
B 90ppm
C 1ppm
D 9ppm
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
A Thermosphere
B Stratosphere
C Troposphere
D Mesosphere
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)
The popular notion that a tree's age can be determined by counting number of internal rings in its trunk is generally true. Howeevr, to help regulate the internal temperature of the tree, the outermost layers of wood of the Brazilian ash often →peel away when the temperature exceeds 95 degrees Fahrenheit, leaving the tree with fewer rings than it would otherwise have. So only if the temperature in the Brazilian ash's environment never exceeds 95 degrees Fahrenheit →elav eing the tree with fewer rings than it would otherwise have. So only if the reliable measure of the tree's age. Which of the following is an assumption on whish the argument above depends?
A The growth of new rings in a trees is not a function of levels of precipitation.
B Only the Brazilaian ash loses rings because of excessive heat.
C One day of temperatures above 95 degrees Fahrenheit will cause the Brazilian ash to lose one ring.
D The internal rings of all tress are of uniform thickness
A compressor that takes suction at a pressure below atmospheric and discharge against atmospheric pressure is called a __________ pump.
A Sump
B Volute
C Vacuum
D Submerged

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