Test # 154
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1540 questions in 154 tests. Each test contains 10 questions.
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GK Indian Geography
Foods to fuel your workout
Cool High Tech Sunglasses
Enjoy Christmas Day
Ways to Reduce Your Impact
Maintain your air conditioning and heating systems by changing air filters and keeping your air conditioner coils clean.
Energy is lost when air conditioners and hot air furnaces have to work harder to draw air through dirty filters. Cleaning a dirty air conditioner filter can save 5 percent of the energy used. That could save 175 pounds of carbon dioxide per year.