Practice State Assessment for Science 7th Grade by liuhongmei

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									Practice State Assessment
       for Science
        7th Grade

S.7.2.4.4
The student understands that heat
energy can be transferred from hot to
cold by radiation, convection, and
conduction.
 S.7.2.4.4.a
 As air is warmed near the earth's surface it tends to
 rise. As the air cools it will sink. This causes Air
 currents in the earth's atmosphere. Which method
 of heat energy transfer is the best explanation for
 the behavior of the air?


A) convection
B) conduction
C) radiation
D) reduction
 S.7.2.4.4.a
 You are standing in front of a fire place watching
 the fire burn. You notice your face getting hot while
 your back stays cool. Which method of heat
 transfer best explains why your face is getting hot?



A) convection
B) conduction
C) radiation
D) reduction
 S.7.2.4.4.a
 The illustration below shows two cups which are filled
 with hot water of two different temperatures.
 A bent metal bar is placed with one of each of its ends in
 each cup. By which method will heat energy most likely
 transfer from one cup to the other?




A) convection
B) conduction
C) radiation
D) none of the above, no heat would transfer
 S.4.4.2.2.c
 While cooking soup on the stove you open the
 utensil drawer to select a spoon to stir the soup. In
 the drawer you find 2 large spoons, a metal one and
 a plastic one. Which would be the best spoon to use
 and why?


A) The metal spoon since it is a poor conductor of heat
   energy.
B) The copper cooking pot instead of the stainless steel
   cooking pot since it will transfer heat to the soup faster.
C) The plastic spoon since it will heat up slowly as
   compared to the metal spoon.
D) The metal spoon will conduct heat at a faster rate than
   the plastic spoon.
S.7.2.4.4.c
Four identical wax balls of equal mass are placed at the ends
of four metal rods attached to a metal disk. The rods are
identical in all ways except for what type of metal they are
made of. The metal disk is held over a lit Bunsen burner and
allowed to get hot. The students notice that after awhile the
balls of wax heat up and drop off. The decided to time how
long it takes for each ball to drop off. The data is presented
below. What conclusions can you draw from the data
presented?
      Metal Bar     Time for Wax Ball to
                      Melt and Fall off
      A (Copper)           18 sec
     B (Aluminum)          32 sec
                           60 sec
        C (brass)          93 sec
        D (Iron)



A)   Rod B is a poor conductor of heat.
B)   Iron is a better conductor of heat than brass.
C)   The wax balls must have been made of different types of wax
D)   Copper was the best conductor of heat
 S.7.4.2.2.d
 The illustration below shows two cups which are
 filled with hot water of two different temperatures.
 A bent metal bar is placed with one of each of its
 ends in each cup. In which direction will heat
 energy flow?




A) from cup A to cup B
B) from cup B to cup A
C) heat energy could flow both ways
D) neither, heat energy will not flow between the cups
 S.7.4.2.2.d
 As you hold an ice cube in your hand it begins to
 melt. Which of the following would be the most
 accurate explanation of why the ice cube melts?



A)   Heat energy will be transferred from your hand to the
     ice cube primarily by convection currents.
B)   Your hand will get cold as coldness conducts to your
     hand.
C)   Heat energy will conduct from your hand to the ice
     cube.
D)   Radiation of heat from the hot pan holding the ice
     cube will cause the ice cubes molecules to vibrate
     faster.
 S.7.4.2.2.e
 A houses furnace turns on. Hot air blows out of the
 air ducts mixing with the cooler air in the rooms of
 the house. What would be true about the resulting
 final air temperature?



A) It will be hotter than the air leaving the furnace
B) It will be in between the original room temperature in the
   house and the air from the furnace.
C) It will be colder than the original air temperature in the
   house.
D) The air in the room will not change temperature.
 S.7.4.2.2.e
 A student has sitting in front of them one liter of
 water at 10ºC and one liter of water at 70ºC. If they
 mix these together what would you predict the
 temperature of the two liters combined?




A) 20ºC
B) 40ºC
C) 60ºC
D) 80ºC
 S.7.4.2.2.e
 100 ml of 60ºC water is mixed with 200ml of 30ºC
 water. Which is the best estimate of the final
 temperature of the combined water?




A)   90ºC
B)   52ºC
C)   45ºC
D)   38ºC
 S.7.4.2.2.e
 If you mix a beaker of cold and a beaker of hot water
 where will the final temperature lie?




A) At a temperature above that of the hot water
B) Some where between the temperatures of the two
   waters
C) At a temperature below that of the cold water?
D) The final temperature would always be exactly half way
   between the original temperatures of the two waters.
The End

								
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