Question

plz help plz

Answer 1

While watching a recent science fiction movie, one Klingon spaceship blows up a Droid spaceship with a laser gun. The Klingon crew watches out the port window and covers their ears to muffle the noise from the explosion. Scientifically, this scene is inaccurate because
A) light can not reflect off objects in the vacuum of space.
B) they would not be able to see anything outside the window.
C) lasers can not be transmitted through the vacuum of space.
D) the sound of the explosion would not be transmitted back to their ship.
2)
Which situation is an example of transferring heat by means of convection?
A) the sun warming the earth
B) the weather patterns outside
C) you toasty-warm in some footy pajamas
D) you accidentally grabbing the hot pan from the oven
3)
Why does light refract when it encounters the glass in a lens?
A) because it speeds up, which causes it to bend
B) because it slows down, which causes it to bend
C) because it hits a dense medium, which causes it to bounce off
D) because it gets absorbed, which causes it to lessen in intensity
4)
Dolphins communicate using compression waves. Some of these sounds are outside the range of human hearing. Upon spotting a hungry shark, dolphin A sends a message to dolphin B. To send this message as quickly as possible, dolphin A would
A) send the message under water.
B) send the message above the water.
C) sound the message as loud as possible.
D) sound the message as soft as possible.
5)
A book falls from a desk. Which graph BEST represents the book’s change in potential energy?
A) A
B) B
C) C
D) D

* Hover over answer image to enlarge
6)


Compare the sounds produce by wave A and wave B. The human ear would hear
A) wave A as a louder sound than wave B.
B) wave A as a higher pitched sound than wave B.
C) wave A and B with the same pitch, but wave A as louder.
D) wave B as a louder and higher pitched sound than wave A.
7)
Assume the light wave directed at the paper is white light and the paper contains pigments that absorb the wavelengths of red-orange-yellow-green-blue-indigo-violet. What color will the paper appear to human eyes?
A) black
B) brown
C) green
D) white
8)
James and Juan were at the highest point in the football stadium, dropping water balloons on people below. Many of the balloons did not break, so the boys added more water to the balloons.

What impact did adding water have on the balloons' potential energy?
A) It had no impact; it just made the balloons bigger.
B) The gravitational potential energy increased because the mass increased.
C) The gravitational potential energy decreased because the diameter increased.
D) The gravitational potential energy remained constant because they did not increase the height.
9)
During physical science, Ms. Greene challenged her students to produce an energy transformation. James and Jill wrapped a 4-inch nail with a coil of fifty turns of wire. They connected one end of the coil to one terminal of a knife switch. They connected the other terminal of the knife switch to the battery. Finally, they connected the end of the coil to the other terminal of the battery.

James held the tip of a 1-inch nail near the flat end of the 4-inch nail. Jill closed the knife switch quickly and then opened it. The 1-inch nail was pulled toward the 4-inch nail.
James and Jill used a battery as a source of electricity to construct
a(n) ______ that created ______ energy that caused the nail to move.
A) motor; electrical
B) generator; magnetic
C) generator; electrical
D) electromagnet; magnetic
10)


Muscles convert chemical energy into
A) light energy.
B) nuclear energy.
C) mechanical energy.
D) electromagnetic energy.
11)
Maria’s father started a fire in the fireplace. He crumpled some paper, lit a match, and soon the logs in the fireplace were burning. In this case, the stored chemical energy in the logs was changed into
A) electrical energy.
B) mechanical motion.
C) heat and light energy.
D) electrical and heat energy.
12)
Will was riding his bike when a dog ran out in front of him. He slammed on his brakes. During this quick stop, some of the mechanical energy (his motion) was changed into
A) heat energy.
B) light energy.
C) kinetic energy.
D) potential energy.
13)
Which statement BEST describes why warm ocean currents are usually surface currents?
A) Warm water is less dense than cold water.
B) Ocean tides bring warm water to the surface.
C) Warm water contains more salt than cold water.
D) Ocean water loses heat to the air at the surface.
14)


In this diagram, medium A represents water and medium B represents air. The phenomenon in this diagram, moving from A to B, is called
A) diffraction.
B) dispersion.
C) refraction.
D) resolution.
15)


Light is reflected when it falls on a clean, smooth surface. The diagram shows a ray of light falling on a surface. Which diagram shows the reflected ray?
A)
B)
C)
D)
16)
When we see colors, it is because light is reflected off objects back to our eyes. Different colors are due to the different _____________ of the light.
A) amplitudes
B) wave speeds
C) wavelengths
D) polarization
17)
Which material is a pure substance?
A) alloy
B) compound
C) mixture
D) solution
18)
Which substance is an example of an element?
A) bronze
B) copper
C) methane
D) rust
19)


Which state of matter has the greatest distance between the individual particles?
A) A
B) B
C) C
D) all are the same
20)
Which is an example of an atom?
A) The smallest unit of Ne.
B) The smallest unit of P4.
C) The smallest unit of NH3.
D) The smallest unit of H2O.
21)
Which statement is the BEST definition of an atom?
A) Anything that has mass and occupies space.
B) The smallest particle that has the properties of an element.
C) A substance that cannot be broken down chemically into simpler substances.
D) The smallest unit of a substance that exhibits all of the properties characteristic of that substance.
22)
Why do electromagnetic waves not require a medium for travel?
A) because electromagnetic waves travel too fast for stationary particles to move with them
B) because electromagnetic waves transmit energy without compressing the particles of the medium
C) because electromagnetic waves generate their own particles for compression and use these for movement
D) because electromagnetic waves move in two-dimensional space, the particles of mediums exist in 3-D space
23)
During chemistry lab, Mrs. Black’s students placed an antacid tablet in a zip lock bag. They recorded the mass of the tablet in the bag. Then they carefully added 50 grams of water and quickly sealed the bag. The tablet began to fizz and soon disappeared. The bag was filled with gas and it felt cold to the touch.
What type of change occurred in the bag and how can you support your answer?
A) It is a physical change because the tablet dissolved.
B) It is a physical change as evidenced by change in temperature.
C) It is a chemical change due to the change in temperature and gas production.
D) It is a chemical change because the tablet dissolved and the temperature of the liquid dropped.
24)


Maria and Miquel were enjoying the fireworks when they got into a chemistry argument. Maria insisted that the fireworks were the result of a chemical reaction. Miguel disagreed. What would you tell them to solve this argument.
A) It is a change of state, solid to gas, due to the addition of energy.
B) The color changes and the release of energy indicate a chemical reaction.
C) Because the fuse were lit and energy is added, it is a physical reaction.
D) It is an endothermic reaction because energy was added; therefore it is a chemical reaction,
25)
Elements are composed of
A) many type of atoms.
B) the same type of atom.
C) many different compounds.
D) the same type of compound.
26)
CO2
NaCl
HCl
These may all be classified as
A) elements and compounds.
B) elements and molecules.
C) elements and pure substances.
D) compounds and pure substances.
27)


As matter changes state from gas to liquid, which of these statements is true?
A) The particles speed up.
B) The particles slow down.
C) The particles get farther apart.
D) The attractive force between the particles decreases.
28)


Comparing Wave A (black) to Wave B (green), Wave A has a
A) higher crest.
B) higher frequency.
C) longer wavelength.
D) greater amplitude.
29)


As we move through the visible spectrum, red to violet (right to left in the image), the wavelength __________ and the frequency ____________.
A) increases; decreases
B) increases; increases
C) decreases; increases
D) decreases; decreases
30)
Common Metals
Name Melting Point Density (g/cm3)
Zinc 419.53 oC 7.134
Nickel 1455oC 8.912
Copper 1084.62oC 8.96
Silver 961.78oC 10.501
Gold 1064.18oC 19.282

During Mr. Nye's science class, students were expected to identify various substances using physical properties they could easily measure. Mr. Nye gave each of the five groups a green, metal cube and asked them to identify what the cube was made of.

Matt's cube, after 5 trials, had an average density of 7.40 g/cm3 . His group's cube was made of
A) aluminum.
B) gold.
C) nickel.
D) zinc.
31)
If a satellite or spaceship explodes in outer space, you can see the explosion from a distance but you cannot hear it. Why?
A) Light waves travel very fast and sound waves travel much slower.
B) Sound waves transmit energy while light does not transmit energy.
C) Sound is a mechanical wave and needs a medium to travel through while light is an electromagnetic wave.
D) Light is a mechanical wave and needs a medium to travel through while sound is an electromagnetic wave.
32)
A balanced chemical reaction obeys the law of
A) ideal gases.
B) definite proportions.
C) conservation of matter.
D) conservation of energy.
33)
Pretend you are an electron in a copper wire which is being used to connect a battery to a flashlight bulb. Because this circuit uses a(n) ___________________ current, you as the electron in the wire will
A) alternating, move first one way then the other.
B) direct, move first one way then the other.
C) alternating, move only in one direction.
D) direct, move only in one direction.
34)
Renaldo and Nasreen build an electromagnet by wrapping a wire around a nail and connecting the wire to both terminals of a battery. When they test the electromagnet, it can pick up 6 paper clips. Their teacher wants all groups to pick up at least 10 paper clips. What could Renaldo and Nasreen do to increase the number of paper clips their electromagnet picks up?
A) make the wire longer
B) remove the nail from the center of the wire
C) increase the number of loops of wire around the nail
D) spread the loops of wire apart on the nail so they do not touch
35)
A car traveled at a constant velocity of 70 mph from noon to 2:00 pm. At 3:00 pm the velocity of the car was 80 mph; and finally at 4:30 pm the velocity of the car was 40 mph.
Which statement accurately describes the acceleration of the car?
A) The car had a positive acceleration the entire time.
B) The car had a negative acceleration from noon to 2:00 pm.
C) The acceleration of the car from 3:00 pm to 4:30 pm was zero
D) The car had a positive acceleration between 2:00 pm and 3:00 pm.
36)
Gravity is a force between any two objects with mass. Why doesn't a person feel a gravitational force between him/herself and another person?
A) A person doesn't exert a gravitational force.
B) The two gravitational forces cancel each other out.
C) The gravitational forces of people is so small it is overshadowed by that of Earth.
D) There are so many people we are actually balanced by all the different gravitational forces.
37)


What is the primary mechanical advantage of using the simple machine seen in the image?
A) You can apply a large force and have it penetrate over a very long distance.
B) You can apply a long distance and have it convert into a very short distance.
C) You can apply a short distance and have it multiplied to penetrate a large distance.
D) You can apply a small force to penetrate something that normally requires a large force.
38)
reactant → product
If there are 2 grams of product produced by the chemical reaction, how many grams of reactant were consumed?
A) 0 grams
B) 1 gram
C) 2 grams
D) 4 grams
39)
During science lab, some students added small pieces of magnesium ribbon to 10 mL of hydrochloric acid. They noticed that bubbles formed, the test tube got hot, and the magnesium disappeared.
Which is a sign that a chemical reaction has taken place in this experiment?
A) change in odor
B) change in color
C) release of heat energy
D) disappearance of magnesium
40)


The graph represents the acceleration of two cars, Accel 1 and Accel 2, during a road trip. Which statement BEST describes the differences between the two cars' acceleration during the trip?
A) Accel 1 accelerates throughout the entire trip; Accel 2 does not accelerate during the trip.
B) Accel 1 rapidly accelerates and then stops; Accel 2 maintains a constant velocity during the trip.
C) Accel 1 has a constant rate of acceleration; Accel 2 accelerates at different rates during the trip.
D) Accel 1 accelerates for the first two-thirds of the trip; Accel 2 has a constant rate of acceleration.
41)
It's Peggy Sue's birthday and she's about to blow out the candles on her cake. Brother Roger stops the party when he shouts: "Look at that! Chemical and physical changes taking places on your birthday cake!"
How would you respond to Roger?
A) Roger is incorrect. The melting wax is a physical change but there is no chemical change taking place.
B) Roger is correct. Lighting the match is a chemical change and burning the candles is a physical change.
C) Roger is correct. The melting wax is a physical change and the burning candle wick is a chemical change.
D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.
42)
A series circuit contains four light bulbs. The switch is opened and one of the bulbs is removed, but not replaced. Then the switch is closed again. What would you expect to see?
A) All three remaining light bulbs will be on.
B) None of the remaining light bulbs will be on.
C) Only the bulb closest to the switch will be on.
D) All three remaining light bulbs will be brighter than before.
43)


The resultant force on the box is
A) 2 Newtons to the left.
B) 10 Newtons to the right.
C) 10 Newtons to the left.
D) 20 Newtons to the right.
44)


How can you decrease the effort force needed to push a weight to the top of the ramp?
A) cover the surface with carpet
B) increase the length of the ramp
C) increase the height of the ramp
D) decrease the length of the ramp
45)


At the county fair, Carrie and Sam climbed up on the carousel horses. Around and around they went; the horses also bobbed up and down. When they got off of the carousel, Carrie told Sam they had been accelerating during their ride. Sam disagreed; they had been moving at a constant speed. Who is correct and why?
A) Carrie is, because the carousel changed speed when it started and stopped.
B) Sam is, because the horses never moved from their position on the carousel.
C) Carrie is, because velocity includes speed plus direction, and both changed.
D) Sam is, they did not accelerate since their speed remained constant for the ride.
46)


Consider the circuit if switches are added at points A, B, C, and D. All the switches are closed EXCEPT the switch at position D, which is left open. What is the result of this?
A) Only light 4 will go out.
B) Only lights 3 and 4 will go out.
C) All of the lights will go out.
D) None of the lights will go out.
47)


In an experiment, identical objects are placed on a glass slab, and a piece of sandpaper, as shown in the image. One end of both surfaces is raised 100 mm and the objects placed on them are observed. The ends are raised in increments of 100 mm until one of the objects begins to move. What does this experiment demonstrate?
A) Friction depends on the surface.
B) Friction is independent of the surface.
C) Friction is applicable to tilted surfaces only.
D) Friction depends on the object more than the surface.
48)


The graph represents the gravitational attraction between two equal masses vs. their distance apart, which statement BEST describes the information presented by the graph?
A) Distance is only a factor in space, not on earth.
B) Gravitational attraction is directly proportional to distance.
C) Gravitational attraction is inversely proportional to distance.
D) Gravitational attraction is not related to the distance between objects.
49)
A strand of 10 lights is plugged into an outlet. How can you determine if the lights are connected in series or parallel?
A) Unscrew one light. If the other lights stay on, it's a series circuit.
B) Unplug the strand. If the first light stays on, it's a series circuit.
C) Unscrew one light. If the other lights turn off, it's a series circuit.
D) Cut the strand in half. If the plugged in half stays on, it's a series circuit.
50)
When a substance such as ice melts, its temperature increases. Describe what happens to the arrangement of the water molecules as the temperature increases.
A) Water molecules separate into hydrogen and oxygen atoms.
B) Water molecules become less orderly and they spread apart.
C) The kinetic energy of the water molecules decreases proportionally to the temperature change.
D) Water molecules lose all contact with one another and intermolecular forces are non-existent.
51)


Ben and Sam were conducting experiments on physical and chemical changes in science class. First they added some salt to water and stirred it up until the salt dissolved. "That's a physical change" Ben said. "And that's a solution which is a mixture", added Sam. Next they added an anti-acid tablet to some water. The water began to fizz and bubble. The beaker got cooler. "That's a physical change too," Ben noted. "No, it's not," responded Sam. Who is correct and where should the contents of the beaker be placed in the Venn diagram?
A) Sam is correct. It is not a physical change and it should be placed in A.
B) Sam is correct. It is a chemical change and the contents should be in D. for compound.
C) Ben is correct. It is a physical change and it is a solution, placing it in B. as a mixture.
D) They are both correct. It is a mixture and a compound and the contents should be placed in C.
52)


How is an electromagnet different from a bar magnet?
A) Only a bar magnet has a magnetic field.
B) Only an electromagnet attracts materials made of iron.
C) An electromagnet is temporary and is magnetic when a current flows through a wire wrapped around the core.
D) A bar magnet is a temporary and is only magnetic when a current flows through a wire wrapped around the core.
53)
A car jack allows you to lift up a heavy car. The car jack works because
A) you apply a greater force over a longer distance.
B) you apply a smaller force over a longer distance.
C) you apply a greater force over a shorter distance.
D) you apply a smaller force over a shorter distance.
54)


The lever allows Jeff to lift a much greater weight because
A) the larger force is applied over a longer distance
B) the larger force is applied over a shorter distance
C) the smaller force is applied over a longer distance
D) the smaller force is applied over a shorter distance
55)


The image above shows two opposite forces acting on a rolling cart, what can we say is true about the affect of the forces on the cart?
A) It cannot be determined without knowing which man is stronger.
B) It cannot be determined because one man is taller than the other.
C) The forces are unbalanced, and net force on the cart moves it to the left.
D) The forces are unbalanced, and net force on the cart moves it to the right.
56)


The Groups 1 and 2 on the periodic table contain what atom type?
A) metals
B) metalloids
C) non-metals
D) noble gases
57)


Luster
Malleable
Ductile
Conductor
Solid at room temperature

Which element could be described by the list of properties above?
A) magnesium
B) mercury
C) neon
D) phosphorus
58)
You can find electric power lines under the ground by looking for magnetic fields at ground level. This is best explained by which of these statements?
A) All wires have magnetic materials in them.
B) An electric current in a wire produces a magnetic field.
C) The power company puts magnets to help find the power lines.
D) The iron in the ground is disturbed by the power lines creating magnetic fields.
59)


Consider the elements in the periodic table. As we move to the far right, the purple column is made up of _________ that are __________.
A) gases; nonreactive
B) metals; nonreactive
C) metalloids; reactive
D) gases; highly reactive

Answer 2

gese 60 questions can y at least ask them seperately????

Answer 3

i will try

Answer 4

AWESOME thanks i need to work on another thing while you do this is that cool :( plz

Answer 5

@Atsie @AloneS @Science_ALLY @Agl202 HELP plz

Answer 6

@Jaynator495 @samanthagreer @millsemily HELP plz

Answer 7

@Testing123guest
Hello there!
I'm afraid that we can't help with tests on OpenStudy, and especially if your being timed. A test is meant to test your overall knowledge based upon the chapter or book you read in relation to the subject itself.
We can help with studying and homework and so forth, but not tests I am afraid. :(
My advice though is to try to focus and eliminate options that make the least sense or that sound the most wrong to you.
I wish you the best of luck! :)

Answer 8

atsie we seriously need to help him

Answer 9

Well, we can't though if its a test. OpenStudy say's that you cannot do that.
If you don't believe me, I can grab a moderator who maybe could explain it better. :)

Answer 10

@hartnn
Could you maybe help us all understand this a bit better? It'd be appreciated! ^.^

Answer 11

ok @Atsie u win I wont help him

Answer 12

:( fine i will just study and try my best on this thank you for trying to help me better understand what i am learning i respect that bye and thx @supersmart1001 , @Atsie , and @hartnn .

Answer 13

Your very welcome @Testing123guest !!
And if you ever want help studying or anything, feel free to message me. I'll be more than obliged to help! ^.^

Answer 14

Asking a graded test question is against the code of conduct policy of both, your school and OpenStudy.
If you ask a question for learning and not to score marks, we will be glad to help ^_^

Answer 15

thx but i will just read over my notes more. :)

Answer 16

@valadin1

Answer 17

yeah bro