1.	What is the force that binds materials together?
	
	a. gravitational
    *	b. electric
	c. strong nuclear
	d. weak nuclear

  2.	Diamond is an example of _______ bonding.
	
	a. ionic
    *	b. covalent
	c. metallic
	d. van der Waals

  3.	If a block of material has a mass of 8 grams and a volume of 4 cubic 
        centimeters, what is its density?
	
	a. 0.5 cubic centimeters per gram
    *	b. 2 grams per cubic centimeter
	c. 4 grams-cubic centimeters

  4.	Copper has a density of 8930 kg/m^3. What is the density of copper 
        in g/cm^3?
	
	a. 8930
	b. 893
	c. 89.3
    *	d. 8.93

  5.	Pressure is the
	
	a. mass per unit volume.
	b. mass per unit area.
	c. force per unit volume.
    *	d. force per unit area.

  6.	In which direction in a fluid at rest can you move without the 
        pressure changing?
	
	a. up
	b. down
    *	c. horizontal
	d. The pressure doesn't change as you move in any of these directions.

  7.	Two barometers are made with water and oil.  The density of oil is 
        900 kg/m3 and that of water is 1000 kg/m3.  If the oil column is
	10 m tall, how tall is the water column?
	
	a. 11.1 m
	b. 10 m
    *	c. 9 m
	d. 8.1 m

  8.	On a day when a water barometer reads 10 m, what is the pressure at 
        the bottom of a 20-m deep tank of water?
	
	a. 1 atm
	b. 2 atm
    *	c. 3 atm
	d. 4 atm

  9.	An object floats whenever its
	
	a. mass is less than the mass of an equal volume of the fluid
	b. weight is less than the weight of an equal volume of the fluid.
	c. density is less than the density of the fluid.
    *	d. All of the above.                         
  
 10.    Three spheres with the same volume all float in water. Spheres 
        A, B and C have masses of 25g, 30g and 35g, respectively. Which
        sphere floats the highest?
	
    *	a. A
	b. B
	c. C
	d. They all float at the same height.

 11.	A plastic bobber just barely floats in water.  
        If it weighs 2 N in air, what is its volume?
	
	a. 300 cm3
    *	b. 200 cm3
	c. 100 cm3
	d. 2 cm3
	 
 12.	Count Rumford's experiments with boring cannons
	
    *	a. showed that heat was not a fluid.
	b. showed that 4.2 joules of work are equivalent to 1 calorie of heat.
	c. were used to define the calorie.
	d. confirmed the law of conservation of energy.

 13.	How many calories are required to heat 400 g of water from 23øC to 33øC?
	
	a. 40
	b. 400
    *	c. 4000
	d. 9200

 14.	What effect would there be on Joule's experiment if the mass fell 
        rapidly, hit the floor with substantial speed, and this was ignored?
	
	a. Nothing.  The loss in gravitational potential energy would still 
           be the same.
	b. Nothing.  The kinetic energy is converted to heat when the mass 
           hits the floor.
    *	c. The number of joules equivalent to 1 calorie would be larger.
	d. The number of joules equivalent to 1 calorie would be smaller.

 15.	Two objects are in thermal equilibrium if
	
	a. they have the same temperature.
	b. they are each in thermal equilibrium with a third object.
	c. they are in thermal contact and there is no net flow of thermal 
           energy.
    *	d. any of the above is true.

 16.	Which law of thermodynamics is the basis for the definition of 
        temperature?
	
    *	a. zeroth
	b. first
	c. second
	d. third

 17.	The first law of thermodynamics is a re-statement of the law of 
        conservation of
	
	a. angular momentum
	b. linear momentum.
	c. mechanical energy.
    *	d. energy.

	 
 18.	The first law of thermodynamics is valid only
	
	a. if no work is done on the system.
	b. when there is no friction.
	c. if there is no heat loss or gain.
    *	d. if the system is isolated.

 19.	Which of the following statements about a cup of water and a gallon 
        of water at the same temperature is correct?
	
	a. They can transfer the same heat energy.
	b. They have the same internal energies.
    *	c. Their internal energies are proportional to their masses.
	d. The average molecular speed in the cup of water is less.
	 
 20.	During a process, 10 joules of work are performed on a system, while 
        the system gives off 5 joules of heat.  The internal energy of the 
        system
	
    *	a. increases by 5 joules.
	b. decreases by 5 joules.
	c. increases by 15 joules.
	d. remains the same.

 21.	The third law of thermodynamics
	
	a. is a restatement of the law of conservation of energy.
	b. says that heat cannot be completely converted to mechanical energy.
    *	c. says that we can never reach the absolute zero of temperature.
	d. says that all motion ceases at absolute zero.

 22.	Why does the coldest part of winter occur during late January and 
        February when the shortest day of the year is near December 21?
	
	a. The specific heat of the ground is a lot higher than that of water.
	b. The sun is farthest from the earth in February.
	c. Because that's when the Southern Hemisphere has summer.
    *	d. It takes the release of a lot of thermal energy for the ground to 
           cool off.

 23.    Global warming by the Greenhouse Effect occurs because

        a. Greenhouse Gases, including Carbon Dioxide, are heated
           by the sun and make the earth's atmosphere hotter.
    *   b. the earth is heated by the sun by electromagnetic radiation. 
           Heat in the form of infrared radiation given off by the
           earth is trapped by the Greenhouse Gases.
        c. the earth's surface is mostly water which acts like
           a Greenhouse. It allows radiation from the sun to be absorbed,
           then it does not allow the energy to be released into the
           atmosphere.
        d. Greenhouse Gases, like Carbon Dioxide, are excited by electrons
           emitted by the sun. When the atoms in the gas become
           deexcited, they emit radiation that heats the earth.