The density of lead is 12 grams per cm3. A lead brick has a mass of 1.5 kilograms. Its dimensions are 10 cm by 5 cm by 4 cm. Is it: w) More than 75% hollow x) Between 50 and 75% hollow y) Between 25 and 50% hollow z) Between 0 and 25% hollow Answer : ANSWER: Y -- BETWEEN 25 AND 50% HOLLOW...
Of the energy used in the United States, about wha percent is provided by hydroelectric power? w) 4% x) 20% y) 50% z) 75% Answer : ANSWER: W -- 4%...
Mass percentage of carbon in CO2 is approximately: w) 37.5% x) 27.3% y) 75% z) 45% Answer : ANSWER: X -- 27.3%...
A machine's output is 4000 joules and its frictional losses are 1000 joules. Which of the following is its efficiency? Is it: w) 25% x) 30% y) 75% z) 80% Answer : ANSWER: Z -- 80%...
If a material has the capacity to behave either as an acid or a base it is said to be: w) amorphous x) amphoteric y) anhydrous z) aklaline Answer : ANSWER: X -- AMPHOTERIC...
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