Question 21 MarkIndiscriminate cutting of the trees results in improvement of soil quality.AnswerFalse. (Indiscriminate cutting of the trees results in soil erosion.)View full question & answer→
Question 31 MarkA fire caused due to electrical components is extinguished by fire extinguishers like carbon dioxide are used.AnswerTrue.View full question & answer→
Question 41 MarkPotassium, sodium and calcium are the metals that react with water at high room temperature.AnswerFalse. (Potassium, sodium and calcium are the metals that react with water at normal room temperature.)View full question & answer→
Question 51 MarkEvery year nearly 2,400 to 4,000 earthquakes occur on the earth.AnswerFalse. (Every year nearly 12,400 to 14,000 earthquakes occur on the earth.)View full question & answer→