RELEASED. North Carolina Test of Physical Science Form A RELEASED Fall 2009 Answer Key
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1 North arolina Test of Physical Science Form RELESE Fall 2009 nswer Key Item Number orrect nswer Goal 1 2 Forces and Motion 2 2 Forces and Motion 3 2 Forces and Motion 4 3 Energy/ Energy onservation 5 3 Energy/ Energy onservation 6 3 Energy/ Energy onservation 7 3 Energy/ Energy onservation 8 4 Electricity and Magnetism 9 4 Electricity and Magnetism 10 4 Electricity and Magnetism 11 5 Structure and Properties of Matter 12 5 Structure and Properties of Matter 13 5 Structure and Properties of Matter 14 5 Structure and Properties of Matter 15 6 Regularities in hemistry 16 6 Regularities in hemistry 17 6 Regularities in hemistry 18 6 Regularities in hemistry 19 6 Regularities in hemistry 20 6 Regularities in hemistry 21 2 Forces and Motion 22 2 Forces and Motion 23 2 Forces and Motion 24 3 Energy/ Energy onservation 25 3 Energy/ Energy onservation 26 3 Energy/ Energy onservation 27 3 Energy/ Energy onservation 28 4 Electricity and Magnetism 29 4 Electricity and Magnetism 30 4 Electricity and Magnetism 31 5 Structure and Properties of Matter 32 5 Structure and Properties of Matter 33 5 Structure and Properties of Matter 34 5 Structure and Properties of Matter 35 6 Regularities in hemistry 36 6 Regularities in hemistry 37 6 Regularities in hemistry 38 6 Regularities in hemistry 39 6 Regularities in hemistry 40 6 Regularities in hemistry 41 2 Forces and Motion 42 2 Forces and Motion RELESE 10 ugust 2009 Page 1
2 North arolina Test of Physical Science Form RELESE Fall 2009 nswer Key 43 2 Forces and Motion 44 3 Energy/ Energy onservation 45 3 Energy/ Energy onservation 46 3 Energy/ Energy onservation 47 4 Electricity and Magnetism 48 4 Electricity and Magnetism 49 4 Electricity and Magnetism 50 4 Electricity and Magnetism 51 5 Structure and Properties of Matter 52 5 Structure and Properties of Matter 53 5 Structure and Properties of Matter 54 6 Regularities in hemistry 55 6 Regularities in hemistry 56 6 Regularities in hemistry 57 6 Regularities in hemistry 58 6 Regularities in hemistry 59 6 Regularities in hemistry 60 6 Regularities in hemistry RELESE 10 ugust 2009 Page 2
3 Name RELESE FORM Physical Science Form North arolina Test of Physical Science Public Schools of North arolina State oard of Education epartment of Public Instruction ivision of ccountability Services/North arolina Testing Program Raleigh, North arolina RELESE 2009 ll rights reserved. This document may not be reproduced by any means, in whole or in part, without prior written permission from the North arolina epartment of Public Instruction, Raleigh, North arolina.
4 NPI North arolina Test of Physical Science. Form RELESE Fall This diagram shows three horizontal forces acting on an object. F Neglecting friction, what is the magnitude of force, F, if the object remains at rest? 6 N 8 N 14 N 22 N 2. This graph represents the velocity of an object over time Velocity vs. Time Time (s) What is the average acceleration of the object during the first 4 seconds? RELESE 1 m/s/s 2 m/s/s 4 m/s/s 8 m/s/s Page 1
5 NPI North arolina Test of Physical Science. Form RELESE Fall This graph represents the motion of a cart What is the average speed of the cart? 0.83 m/s 1.17 m/s 5 m/s 65 m/s istance vs. Time Time (s) 4. person places a metal spoon that is at room temperature into a bowl of hot soup. How will the thermal energies of the spoon and the soup be affected? The spoon will increase in thermal energy, and the soup will decrease in thermal energy. oth the spoon and the soup will increase in thermal energy. RELESE The spoon will decrease in thermal energy, and the soup will increase in thermal energy. oth the spoon and the soup will decrease in thermal energy. Page 2
6 NPI North arolina Test of Physical Science. Form RELESE Fall Which is the lowest point of a transverse wave? amplitude crest period trough 6. n object has a mass of 12.8 kg and a velocity of 8.4 m s. What is the kinetic energy of the object? 53.8 J J J J 7. How much potential energy does a 55-kg person gain when she walks to the top of a hill 20 m tall? RELESE 75 J 539 J 1,100 J 10,780 J Page 3
7 NPI North arolina Test of Physical Science. Form RELESE Fall student builds an electromagnet using a variable power source and 40 turns of wire. The electromagnet is used to pick up metal paper clips. The student changes the voltage and counts the number of paper clips that are picked up. Which table could be the data the student collected? Voltage (V) Voltage (V) Number of Paper lips Number of Paper lips Voltage (V) Number of Paper lips RELESE Voltage (V) Number of Paper lips 9. Which statement best explains why there could be a force of attraction between two electrically charged objects? because they have like charges because they have unlike charges because they have the same number of protons because they have the same number of electrons Page 4
8 NPI North arolina Test of Physical Science. Form RELESE Fall This diagram represents a closed circuit. R = 6 V = 12 V How much current flows through this circuit? n atom has 29 protons, 29 electrons, and 35 neutrons. What is the mass number of the atom? Which one of these scientists described a model of the atom that included energy levels? RELESE alton ohr Newton Thomson Page 5
9 NPI North arolina Test of Physical Science. Form RELESE Fall This chart represents the melting points and boiling points of some substances. Substance Ethanol Hexane Methane Methanol Which substance is a gas at 45? Ethanol Hexane Methane Methanol Melting and oiling Points for Substances Melting Point ( ) oiling Point ( ) How many protons and neutrons are there in an atom of 11 5? 5 protons and 6 neutrons 5 protons and 11 neutrons 11 protons and 5 neutrons 11 protons and 6 neutrons RELESE Page 6
10 NPI North arolina Test of Physical Science. Form RELESE Fall This graph shows the solubility curves for various ionic compounds Solubility of Various ompounds sno 3 NH 4 r uso Temperature ( ) Which compound is most affected by a change in temperature from 30 to 50? sno3 4 NH r uso4 Kl RELESE Kl Page 7
11 NPI North arolina Test of Physical Science. Form RELESE Fall Which pair of elements has the most physical and chemical properties in common? Ge and Se K and Kr l and Ga a and i 17. Which chemical equation represents a double replacement reaction? 2 2Na l 2Nal 2KlO3 2Kl 3O2 Zn 2Hl Znl2 H2 2 NaOH Hl Nal H O 18. Which best explains why water dissolves most salts? Water is polar, and salts form ions in solution. Water is nonpolar, and salts form ions in solution. Water has the same density as salts. RELESE Water has a different density than salts. 19. How is this reaction classified? ao H O a OH 2 heat 2 endothermic exothermic decomposition double replacement 20. Which chemical formula represents magnesium phosphate? MgPO4 Mg2PO4 Mg PO Mg PO Page 8
12 NPI North arolina Test of Physical Science. Form RELESE Fall car is traveling at a constant speed of 12 m/s. When the driver accelerates, the car reaches a speed of 26 m/s in 6 s. What is the average acceleration of the car? 2 m/s/s 2.3 m/s/s 4.3 m/s/s 84 m/s/s 22. large rock has a mass of 750 kg. What is its weight? 76.5 N N N 7,350 N kg student kicks a 1.5-kg ball with a force of 450 N. What force does the ball apply on the student? 4.5 N 300 N 450 N 675 N 24. metal spoon is used to stir a pot of boiling water. The person holding the metal spoon feels the spoon get hot. Which best describes the transfer of heat in the spoon? RELESE radiation electrical conduction convection 25. student moves a box across the floor by exerting 23.3 N of force and doing 47.2 J of work on the box. How far does the student move the box? 0.49 m 2.03 m 23.9 m 1,099.8 m Page 9
13 NPI North arolina Test of Physical Science. Form RELESE Fall sound wave has a frequency of 247 Hz and a wavelength of 1.4 m. What is the speed of the sound wave in air? m/s m/s m/s m/s 27. What happens to the kinetic energy and gravitational potential energy of a ball during free fall? Gravitational potential energy and kinetic energy both increase. Gravitational potential energy and kinetic energy both decrease. Gravitational potential energy decreases, and kinetic energy increases. Gravitational potential energy increases, and kinetic energy decreases. 28. If the north poles of two bar magnets are brought together, which is true? RELESE The two north poles will repel each other. The two north poles will attract each other. No force will be experienced between the two magnets. One north pole will become a south pole due to the interaction. 29. series circuit has a current of 3. The circuit contains a 12- resistor. What is the voltage of the circuit? 0.25 V 4 V 15 V 36 V Page 10
14 NPI North arolina Test of Physical Science. Form RELESE Fall This diagram represents a closed circuit with three light bulbs and a 10-volt battery. 10 V ulb 1 ulb 3 ulb 2 If ulb 3 burns out in the circuit, what will most likely happen? ulb 1 and ulb 2 will continue to glow. ulb 1 and ulb 2 will not glow as brightly. ulb 1 will glow, but ulb 2 will not glow. ulb 1 and ulb 2 will not glow. 31. This chart lists the densities of various gemstones. ensities of Gemstones Gemstone Opal iamond Garnet Topaz ensity (g/cm 3 ) gemstone has a mass of 6.24 g and a volume of 1.98 gemstone? 3 cm. What is the identity of the RELESE Opal iamond Garnet Topaz Page 11
15 NPI North arolina Test of Physical Science. Form RELESE Fall Which accounts for most of the mass of an atom? electrons protons neutrons and protons electrons and neutrons 33. Which describes an atom with an atomic number of 9? 10 protons, 9 neutrons 9 protons, 10 neutrons 4 protons, 5 neutrons 3 protons, 3 neutrons 34. Which conclusion can be drawn from Rutherford s gold foil experiment? The atom has a small positive center. The atom has a small negative center. The atom has a large positive center. The atom has a large negative center. 35. Which is the correctly balanced equation? l2 2NaI 2Nal I2 l2 2NaI Nal 2I2 l2 NaI Nal I2 2l2 NaI 2Nal I2 36. Which situation provides the best evidence that a chemical reaction is taking place? RELESE metal strip bends when heated. solution freezes in the freezer. Two solutions mixed in a beaker produce a solid. chemical completely dissolves in water and the temperature of the solution remains constant. Page 12
16 NPI North arolina Test of Physical Science. Form RELESE Fall What is one problem with using nuclear fission as an energy source? finding radioactive elements that have longer half-lives finding ways of storing radioactive wastes finding compounds to cool heated water finding nonradioactive elements for nuclear reactors 38. Which element is an alkaline earth metal? Li O Ne a 39. n aqueous solution is tested with an electrical conductivity probe. The conductivity probe does not detect an electric current. Which solution was most likely tested? 2 SO solution 3 NaNO solution 2 Mnl solution a OH 2 solution 40. Which type of bond is responsible for atoms of pure gold to remain bonded? RELESE covalent hydrogen ionic metallic Page 13
17 NPI North arolina Test of Physical Science. Form RELESE Fall This graph shows the motion of a car What distance has the car traveled in 10 s? 0 m 8 m 50 m 100 m 0 istance vs. Time Time (s) 42. This diagram represents a balloon that is moving in one direction while escaping air is moving in the opposite direction. What causes the balloon to move? ir alloon RELESE action-reaction forces electrical forces friction gravitational potential energy Page 14
18 NPI North arolina Test of Physical Science. Form RELESE Fall student applies a force to a box with a mass of 30 kg. If the student applies the same force to a box with a mass of 15 kg, which best describes the effect on the acceleration of the 15-kg box? It is half the acceleration of the 30-kg box. It is double the acceleration of the 30-kg box. It is the same as the acceleration of the 30-kg box. It is triple the acceleration of the 30-kg box. 44. Which is true of infrared waves? They have shorter wavelengths than X-rays. They give off more energy than gamma rays. They have longer wavelengths than ultraviolet waves. They have higher frequencies than visible light waves. 45. If 15 N of force are applied to a cart to move it a distance of 5 m, how much work is done on the cart? RELESE 0.33 J 3 J 15 J 75 J 46. ball with a mass of 5 kg is dropped from a resting position 10 m above the ground. What is the potential energy of the ball just before it is dropped? 0 J 49 J 98 J 490 J Page 15
19 NPI North arolina Test of Physical Science. Form RELESE Fall How could 3 magnets be arranged end-to-end so that there will be no attraction between them? N S S N N S S N N S N S N S N S S N S N S N S N 48. flashlight bulb connected to a 6-V battery draws a 0.5- current. What is the power used by the flashlight bulb? 1.25 W 3 W 6.5 W 12 W RELESE Page 16
20 NPI North arolina Test of Physical Science. Form RELESE Fall This diagram shows two copper spheres. Sphere 1 is negatively charged, and Sphere 2 is neutral. Sphere 1 What will be the result when the two spheres touch? Sphere 1 will become positively charged. Sphere 2 will become positively charged. Sphere 2 oth spheres will become negatively charged equal to the initial charge of Sphere 1. oth spheres will become negatively charged less than the initial charge of Sphere 1. RELESE Page 17
21 NPI North arolina Test of Physical Science. Form RELESE Fall Which circuit has the most current flowing through it? 15 W V = 12 V 16 W V = 9 V 9 W V = 15 V 18 W V = 12 V 51. Which best represents how electrons are arranged in the energy levels of a carbon atom? first energy level = 1 electron second energy level = 5 electrons first energy level = 2 electrons second energy level = 4 electrons first energy level = 3 electrons second energy level = 3 electrons RELESE first energy level = 4 electrons second energy level = 2 electrons Page 18
22 NPI North arolina Test of Physical Science. Form RELESE Fall This graph shows temperature vs. energy data for a substance. Temperature vs. Energy What is the melting point of this substance? How many neutrons are in an atom of Pu-246? ,000 1,200 1,400 1,600 1,800 Energy (J) 54. Which element has the same number of valence electrons as krypton (Kr)? RELESE neon (Ne) fluorine (F) chlorine (l) selenium (Se) Page 19
23 NPI North arolina Test of Physical Science. Form RELESE Fall teacher wants to demonstrate a chemical reaction to her students. Which activity would best demonstrate a chemical reaction? placing a metal in an acid to create a gas measuring the densities of liquid water and ice melting a solid piece of aluminum filling a balloon with helium gas 56. This chart shows the effects of several solutions on litmus paper. Solution 1 None Which solutions are most likely acids? Solutions 1 and 3 Solutions 2 and 5 Solutions 3 and 6 Solutions and Their Effects on Litmus Paper Effect on lue Litmus None None Turns Red None None Turns Red Effect on Red Litmus Turns lue Turns lue None None Turns lue None None RELESE Solutions 4 and 7 Page 20
24 NPI North arolina Test of Physical Science. Form RELESE Fall This is an unbalanced equation representing a chemical reaction. HgO Hg O 2 Which equation is the correctly balanced chemical equation for this reaction? HgO Hg 2O2 2HgO Hg O2 2HgO 2Hg O2 2HgO Hg 2O2 58. Which statement best describes the atoms of elements that form compounds by covalent bonding? RELESE They share electrons between them. They have a large difference in atomic mass. They are in the same period in the periodic table. They have a large difference in valence electron number. Page 21
25 NPI North arolina Test of Physical Science. Form RELESE Fall What type of chemical reaction is represented by this equation? decomposition double replacement single replacement synthesis 60. Which best describes alpha particles? 2Li ( s) 2H O ( l) 2LiOH ( aq) H ( g ) They are attracted to negative electric fields. They are composed of beta particles. They are able to penetrate concrete blocks. They are products of chemical reactions. STOP End of Physical Science Test 2 2 RELESE Page 22
26 North arolina Test of Physical Science Form RELESE Fall 2009 Raw to Scale Score onversion Raw Score Scale Score RELESE 10 ugust 2009 Page 1
27 North arolina Test of Physical Science Form RELESE Fall 2009 Raw to Scale Score onversion RELESE 10 ugust 2009 Page 2
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