Related Questions

__________ content of the phosphate rock is the pollutant of primary interest in a phos-phatic fertiliser plant.
A Calcium
B Fluorine
C Phosphorous
D Sulphur
একটি স্টেপ আপ ট্রান্সফরমারে, গৌণ কুণ্ডলীর পাকসংখ্যা মুখ্য কুন্ডলীর পাকসংখ্যার দ্বিগুণ। যদি মূখ্য কুন্ডলীকে কোন পরিবর্তী বিদ্যুৎ লাইনের সাথে সংযুক্ত করা হয়, তাহলে মুখ্য কুণ্ডলীর তুলনায় গৌণ কুণ্ডলীতে- (In a step up transformer, the number of turns in the secondary coil is twice to that of primary coil. If you apply an alternating current in the primary coil, then in the secondary coil compared to the primary coil-)
A তড়িৎ প্রবাহের মান দ্বিগুণ হবে (current will be doubled)
B তড়িৎ প্রবাহের মান অর্ধেক হবে (current will be halved)
C তড়িৎ বিভবের মান অর্ধেক হবে (voltage will be halved)
D তড়িৎ প্রবাহের মান সমান থাকবে (Current will remain the same)
Which one of the following gases is most significant as air pollutant?
A Carbondioxide
B Oxygen
C Nitrogen
D Sulphur-dioxide
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
A Mercury
B Arsenic
C Aluminium
D Lead
Which of the following is NOT a secondary air pollutant?
A Aldehydes
B Nitric oxide
C Ketones
D Nitrogen dioxide
Which of the following is not a gaseous air pollutant?
A Ozone
B Fumes
C Hydrogen sulphide
D Carbon
Which of the following is not an air pollutant?
A Ozone
B Carcinogens
C Pesticides
D Metallic powders
Which of the following metals is not a pollutant ?
A Mercury
B Arsenic
C Lead
D Aluminium
Which of the following is usually not an air-pollutant?
A Hydrocarbons
B Sulphur dioxide
C Carbon dioxide
D Nitrous oxide
Which of the following is not a weightless pollutant?
A SPM
B Thermal pollution
C Radioactive rays
D Noise pollution

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