Conceptual Physics Chapter 15 Test Questions with Complete Solutions

Conceptual Physics Chapter 15 Test Questions with Complete Solutions When you touch a cold piece of ice with your finger, energy flows A) from your finger to the ice B) from the ice to your finger C) actually, both ways - Answer-A) from your finger to the ice Heat energy travels from an object with a high A) internal energy to an object with a lower internal energy B) temperature to an object with a lower temperature C) Both of these, for they say essentially the say the same thing D) None of the above choices are true - Answer-B) temperature to an object with a lower temperature Which of the following normally warms up fastest when heat is applied? A) water B) iron C) glass D) wood E) all of the above choices are equally true - Answer-B) iron A substance that heats up relatively quickly has a A) high specific heat B) low specific heat C) high conductivity D) low conductivity - Answer-B) low specific heat The fact that thermometer "takes its own temperature" illustrates A) thermal equilibrium B) energy conservation C) the difference between heat and internal energy D) the fact that molecules are constantly moving - Answer-A) thermal equilibrium Heat energy is measured in units of A) joules. B) calories. C) Choices A and B are both true. D) Choices A and B are both false. - Answer-C) Choices A and B are both true The moderate temperatures of islands throughout the world has much to do with water's A) poor conductivity. B) vast supply of internal energy. C) high specific heat. D) high evaporation rate. E) absorption of solar energy. - Answer-C) high specific heat. Ice has a lower density than water because ice A) sinks. B) molecules are more compact in the solid state. C) molecules vibrate at lower rates than water molecules. D) is made of open-structured, hexagonal crystals. E) density decreases with decreasing temperature. - Answer-D) is made of openstructured, hexagonal crystals. Compared to a giant iceberg, a hot cup of coffee has A) more internal energy and higher temperature. B) higher temperature, but less internal energy. C) a greater specific heat and more internal energy. D) none of these - Answer-B) higher temperature, but less internal energy. Microscopic slush in water tends to make the water density A) greater. B) less. C) no change - Answer-B) less. Before ice can form on a lake, all the water in the lake must be cooled to A) zero degrees C B) 4 degrees C C) minus 32 degrees C D) none of the above are true. Ice can form at the surface regardless of the water temperature below. - Answer-B) 4 degrees C Ice tends to form first at the A) surface of bodies of water B) bottom of bodies of water C) surface or bottom depending on the water depth A) surface of bodies of water - AnswerWhen an iron ring is heated, the hole becomes A) smaller B) larger C) neither smaller or larger D) either smaller or larger, depending on the ring thickness - Answer-B) larger As a piece of metal with a hole in it cools, the diameter of the hole A) increases B) decreases C) remains the same - Answer-B) decreases When we enlarge a photograph of an iron ring, the image of the hole becomes A) smaller B) larger C) neither smaller or larger - Answer-B) larger When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is A) iron gets hotter before copper. B) copper gets hotter before iron. C) copper expands more than iron. D) iron expands more than copper - Answer-C) copper expands more than iron. If glass expanded more than mercury, then the column of mercury in a mercury thermometer would rise when the temperature A) increases. B) decreases. C) neither of these - Answer-B) decreases. Which of the following expands most when the temperature is increased? Equal volumes of A) iron. B) wood. C) ice water. D) helium. E) All expand the same. - Answer-D) helium. Which of the following expands when the temperature is lowered? Equal volumes of A) iron. B) wood. C) helium. D) water at 4 degrees C. E) None expands when the temperature is lowered. - Answer-D) water at 4 degrees C.