Chapters 18 for Section Test 2

The amount of energy ultimately converted to heat by a light bulb is about 60%. 15%. 30%. 45%. 100%.

100%.

Consider a piece of metal that is at 5 degrees C. If it is heated until it has twice the internal energy, its temperature will be 556 degrees C. 273 degrees C. 278 degrees C. 283 degrees C. 10 degrees C.

283 degrees C.

Two identical blocks of iron, one at 10 degrees C and the other at 20 degrees C, are put in contact. Suppose the cooler block cools to 5 degrees C and the warmer block warms to 25 degrees C. This would violate the 1st law of thermodynamics. 2nd law of thermodynamics. both of these neither of these

2nd law of thermodynamics.

A container of air is at atmospheric pressure and 27 degrees C. To double the pressure in the container, it should be heated to 300 degrees C. 54 degrees C. 600 degrees C. 327 degrees C. none of these

327 degrees C.

The ideal efficiency for a heat engine operating between the temperatures of 227 degrees C and 27 degrees C is 20%. 25%. 88%. 40%. none of these

40%.

The greater the difference in temperature between the input reservoir and the output reservoir for a heat engine, the greater the efficiency. less the efficiency. Neither - efficiency of a heat engine doesn't depend on temperature difference.

greater the efficiency.

A heat engine would have 100 percent efficiency if its input reservoir were at any finite temperature regardless of the heat sink temperature. 100 times cooler than the exhaust sink. 100 times hotter than the exhaust sink. 1000 times hotter than the exhaust sink. any finite temperature if the exhaust sink were at absolute zero.

any finite temperature if the exhaust sink were at absolute zero.

The first law of thermodynamics is a restatement of the Carnot cycle. law of heat addition. principle of entropy. conservation of energy. none of these

conservation of energy.

If a blob of air is swept upward, with no heat input or output, its temperature increases. decreases. remains the same.

decreases.

Suppose you put a closed, sealed can of air on a hot stove burner. The contained air will undergo an increase in internal energy. pressure. internal energy, temperature and pressure. temperature. temperature and pressure.

internal energy, temperature and pressure.