Physics ch.15

The temperature at the bottom of Lake Tahoe, high in the Sierra Nevada Mountains in California, at this moment is A) below 4°C. B) 4°C. C) above 4°C. D) uncertain.

4°C.

When water at 4°C is heated it expands. If it is instead cooled it will A) contracts. B) also expand. C) neither contracts nor expands.

also expand

Open spaces in ice crystals contribute to A) decreased density. B) increased density. C) neither of these

decreased density

If the temperature of a sample of water at 0°C is slightly increased, its volume A) increases. B) decreases. C) remains the same.

decreases

Ice has a lower density than water because ice A) molecules are more compact in the solid state. B) molecules vibrate at lower rates than water molecules. C) is composed of open-structured crystals. D) density decreases with decreasing temperature.

is composed of open-structured crystals

When we enlarge a photograph of an iron ring, the image of the hole becomes A) smaller. B) larger. C) neither smaller nor larger.

larger

The white-hot sparks from a 4th-of-July-type sparkler that strike your skin transfer A) little energy to you in spite of their high temperature. B) little energy to you due to their low temperature. C) much energy, but at a low temperature. D) none of the above

little energy to you in spite of their high temperature

The fact that desert sand is very hot in the day and very cold at night is evidence that the specific heat capacity of sand is relatively A) low. B) high. C) practically absent.

low

A substance that cools down faster than others has a A) low specific heat capacity. B) high specific heat capacity. C) either of these D) neither of these

low specific heat capacity

The fact that a 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.

thermal equillibrium

In terms of thermal expansion it is important that A) a key and its lock are made of similar or the same material. B) the fillings in your teeth expand at the same rate as teeth. C) iron rods and concrete in which they're embedded expand equally. D) all of the above E) none of the above

the fillings in your teeth expand at the same rate as your teeth

When ice floats in water, a small part of it extends above the surface. Interestingly, the volume of ice that extends above the surface is equal to the volume of the A) water the ice displaces. B) vast number of open spaces in all the hexagonal ice crystals. C) both of these D) neither of these

vast number of open spaces in all the hexagonal ice crystals

Before ice can form on a lake, all the water in the lake must be cooled to A) zero°C. B) 4°C. C) -32°C. D) none of the above

4°C.

Which temperature scales have equal sized degrees? A) Fahrenheit and Celsius B) Fahrenheit and Kelvin C) Celsius and Kelvin D) none of the above

Celsius and Kelvin

Which of these is correct? A) a piece of solid iron floats in molten iron. B) a piece of solid aluminum floats in molten aluminum. C) a piece of ice floats in water. D) all the above E) none of the above

a piece of ice floats in water

The air in your room is composed of molecules that have: A) nearly identical speeds. B) a wide variety of speeds. C) no speeds worth mentioning.

a wide variety of speeds

White-hot sparks from a 4th-of-July-type sparkler that strike your skin have relatively A) high temperatures. B) few molecules per spark. C) low transfer of energy. D) all of the above E) none of the above

all of the above

Ice crystals in nearly frozen liquid water make up a A) microscopic slush. B) region of lower density. C) both of these D) neither of these

both of these

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. E) none of the above

copper expands more than iron

Which of the following contracts most when the temperature is decreased? Equal volumes of A) iron. B) wood. C) water. D) helium. E) all contract the same.

helium

Materials composed of molecules that absorb large amounts of energy in the form of internal vibrations and rotations have A) low specific heats. B) high specific heats. C) none of the above

high specific heats

The specific heat capacity is highest for substances that absorb or release large quantities of heat for correspondingly A) small temperature changes. B) large temperature changes. C) small or large changes in temperature. D) none of the above

small temperature changes.

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 the above D) none of the above

temperature to an object with a lower temperature