Recently, significant problems regarding energy use have emerged. Enormous amounts of pollutants are being emitted from power plants, factories, and automobiles, which are worsening the condition of the earth. This environmental degradation is a clear result of acid rain, increased levels of carbon dioxide in the atmosphere, and other forms of air pollution. Acid rain and air pollution, for instance, are devastating forests, crops, and lakes over wide areas all over the world. Since the 1950s, carbon dioxide levels in the atmosphere have increased by 13%, setting the stage for global warming. As atmospheric temperature rise, grain output may significantly decrease, making it more difficult for farmers [গণিত] keep face with the growth of population. In urban areas, air pollution is taking a toll on the buildings and human health. The reduce the amount of environmental damage in cities, developed countries have devised technology [গণিত] control the harmful emissions. However, as these countries already have an abundance of vehicles that continue [গণিত] grow in number, the efficacy of these measures is diminished. Since cars and other vehicles create more air pollution than any other human activity, the most effective veins [গণিত] reduce pollution is [গণিত] decrease the number of vehicles. A major shift away from automobile usage in urban areas may be possible with the aid of urban planning. An antonym of 'efficacy [গণিত] is :

ক. Uselessness

খ. representation

গ. reproduction

ঘ. efficiency

উত্তর: Uselessness

ব্যাখ্যা: Main word Meaning Synonyms Antonyms Efficacy কার্যকারিতা efficiency, productiveness, ability,capability, effectiveness ineffectiveness incompetence, inadequacy, inability. Efficacy শব্দের অর্থ কার্যকারিতা বা দক্ষতা। এর antonym হবে uselessness, যার অর্থ অকার্যকরতা বা অপ্রয়োজনীয়তা। Representation প্রতিনিধিত্ব Reproduction প্রজনন/অনুলিপি তৈরি করা Efficiency দক্ষতা

Admission DU A প্রশ্নব্যাংক ২০১৪-২০১৫ MCQ — Prosthuti প্রশ্নব্যাংক