Transcript CRCT Preparation Four identical light bulbs are connected in a

CRCT Preparation
Four identical light bulbs are connected
in a circuit as shown below.
The current is greatest through which of
the light bulbs?
A. 1
B. 2
C. 3
D. 4
Ms. Roberts, the science teacher, showed
the class several lights connected in a
circuit. One light bulb burned out. All of
the other lights then turned off. What kind
of circuit had she been showing the class?
A. a circuit with too many batteries
B. a circuit with too many wires
C. a parallel circuit
D. a series circuit
Which of the following is shown in this
diagram?
A. Alternating current
B. Short circuit
C. Series circuit
D. Parallel circuit
What is the negatively charged
particle that flows through a
circuit?
A. electron
B. proton
C. neutron
D. ion
Which picture could show the direction
of the electrical current in the circuit?
A.
B.
C.
D.
In the diagram, what essential part of an
electric circuit is missing at position X?
A. Load
B. On/off switch
C. Wires
D. Source of
electric current
Electric Circuits & Magnets
CRCT Preparation
Mike believes that electricity can be made
using a strong magnetic field and a coil of
wire. Which question would be appropriate
for investigating this statement?
A. How should the coil be moved in the
magnetic field to make electricity?
B. What is the largest magnetic field that can be
produced?
C. What should the diameter of the wire be?
D. Could solar power be used to generate
electricity?
In the eighteenth century, Oersted
discovered that the indicator on a
magnetic compass moved when the
compass was placed near a wire carrying
electric current. This was the first
evidence showing that
A. electricity is the same as magnetism.
B. electric currents cause magnetic fields.
C. magnets attract electricity.
D. magnets need electricity to work.
The attraction of hair to a briskly
rubbed plastic comb is an example
of
A. magnetism.
B. static electricity.
C. gravity.
D. radiation.
Use the table below to answer this question.
Which conclusion is
best supported by the
results in the table?
A. All metals are
magnetic.
B. Some metals are
magnetic.
C. Some nonmetals
are magnetic.
D. All nonmetals
are magnetic.
How can the materials in the diagram be
used to make a magnet?
A. replace the iron nail
with a wood rod
B. add more loops of
wire to the iron nail
C. connect the ends of
the wire to each
other
D. touch the ends of the
wire to the ends of
the battery
Which of the following is a true statement
about the magnetic field between two
magnets?
A. The south pole of one magnet is attracted
to the south pole of the other magnet.
B. The south pole of one magnet is attracted
to the north pole of the other magnet.
C. The north pole of one magnet is attracted
to the north pole of the other magnet.
D. The south pole of one magnet is attracted
to both poles of the other magnet.
A magnetic resonance imager (MRI) is
used in hospitals to observe internal
organs. The patient being imaged cannot
have anything that will be attracted to the
imager's powerful magnet. Which might
cause a patient the most problems?
A. an aluminum belt buckle
B. dental fillings made from silver and
mercury
C. a brass zipper
D. a steel replacement joint
CRCT Preparation
Four pairs of objects have the masses
shown below. If the objects in each pair
are the same distance apart, the
gravitational force between the objects
in which pair is greatest?
A. 1 kilogram and 1 kilogram
B. 1 kilogram and 2 kilograms
C. 2 kilograms and 1 kilogram
D. 2 kilograms and 2 kilograms
In the absence of air resistance, which
of these objects will fall at the fastest
rate when dropped?
A. the ball with a mass of 75 kg
B. the ball with a mass of 25 kg
C. the ball with a mass of 10 kg
D. They all fall at the same rate.
Satellites stay in place as they orbit
because of
A. the repeated firing of rocket boosters.
B. the gravitational pull of Earth.
C. a narrow path through the vacuum of
space.
D. solar panels generating energy to hold
them in place.
On Earth, an astronaut has a mass of
140 kg. When the astronaut goes into
space, she
A. will have a mass of 140 kg, but will
have less weight.
B. will have less mass and weight.
C. will have a mass of 140 kg, and have a
weight of 140 kg.
D. will have less mass and a weight of
140 kg.
The gravitational force with which
Earth attracts a body is measured
as
A. density.
B. time.
C. velocity.
D. weight.
The space shuttle uses booster rockets for its
launch, but does not need them for the rest
of its journey. This is because the booster
rockets
A. direct the shuttle onto its correct orbital path.
B. reduce the amount of fuel needed for the
launch.
C. allow the shuttle to overcome the pull of
gravity.
D. protect the shuttle from damage during the
launch.
As an astronaut travels from Earth to a
space station orbiting Earth, what
happens to her mass and weight?
A. Her mass decreases, but her weight
remains the same.
B. Her mass increases as her weight
decreases.
C. Her mass remains the same, but her
weight decreases.
D. Her mass decreases and her weight also
decreases.
The force that holds you to Earth's
surface is
A. gravity.
B. weight.
C. mass.
D. pressure.
Which is true about friction and
gravity?
A. Both are forces.
B. Both cause energy loss.
C. Both cause things to speed up.
D. Both cause heat.
Which is a result of the effect of
gravity?
A. Rocket engines can force objects
into space.
B. Air friction causes falling objects to
slow down.
C. Released objects always fall toward
Earth's surface.
D. Airplanes are able to fly without
falling to the ground.
CRCT Prep
A force (F1) is required to pull a 20-kg box
across a carpeted floor. What is typically true
about the force (F2) required to pull the boxes
across the ice at a rink?
A.
B.
C.
D.
F1 is greater than F2.
F1 is less than F2.
F1 equals F2 but both are less than 20 kg.
F1 equals F2 and both are equal to 20 kg.
Pauline needs to measure the sliding friction of
a brick. How should she go about doing this?
A. attach the brick to a string and then to a
spring scale and read the force needed to
quickly lift the brick off the ground
B. drag the brick by a string attached to a
spring scale so that it gradually speeds up
C. drag the brick by a string attached to a
spring scale along the surface of a table at a
constant speed and read the force
D. hang the brick from a string attached to a
spring scale and read the force
Which of the following arrangements will
remain stationary unless an external force
acts on it? Assume there is no friction.
A.
C.
B.
D.
Two children are playing on a seesaw in the
park. Child A, who weighs less than child
B, is suspended in the air. In order to raise
Child B into the air, Child A must
A. move farther away from the fulcrum of the
seesaw.
B. jump up and down in place.
C. move closer to the fulcrum of the seesaw.
D. do nothing.
Sam was learning how to roller-skate.
He did not want to go fast. On which
kind of floor surface would Sam travel
the slowest?
A.
B.
C.
D.
carpet
concrete
tile
wood
A car is traveling down a hill. Which
of the following will affect the amount
of energy the car has?
A.
B.
C.
D.
how long the car is
the time of day
how much the car weighs
the color of the car
All objects in the universe are
attracted to each other by the force of
A.
B.
C.
D.
effort.
friction.
gravity.
inertia.
Suzan places a marble and a ball of modeling
clay on the surface of water in a jar. Both
objects sink. Suzan removes them from the
water. Then she molds the clay ball into a
bowl shape and again places the two objects
on the surface of the water. What happens
next?
A. The marble and the clay bowl both sink.
B. The marble and the clay bowl both float.
C. The marble floats and the clay bowl sinks.
D. The marble sinks and the clay bowl floats.
Why do some competitive swimmers
shave their heads and bodies?
A.
B.
C.
D.
to decrease weight
to decrease friction
to increase buoyancy
to increase blood flow
Oliver the dog doesn’t want to walk in the
rain. He can make his owner pull harder
on the leash to get him out the door by
A.
B.
C.
D.
sitting on the vinyl floor
sitting on the tile floor.
sitting on the carpeted floor.
sitting on the wood floor.
Katie sent a soccer ball toward Andy on a flat
field. The ball started moving because of
which force?
A. her kick
B. gravity
C. friction
D. air inside the ball
Which of the following is true about the
relationship between an object’s mass and its
weight?
A. The object’s mass is caused by the weight of
the object pushing downward.
B. Weight is gravity’s force on the object, which is
determined by it’s mass.
C. An object’s weight and its mass are the same,
but they are measured differently.
D. An object’s weight and its mass are
independent of each other.
Jeff was riding in a car. Which change
demonstrates the greatest effect of inertia?
A.
B.
C.
D.
The car makes a sudden stop.
The car slows down gradually.
The care changes into another lane.
The care runs out of gas and rolls to
a stop.
Simon rolled his ball down a hill. The
ball stopped before it reached the bottom
of the hill. Which of these most likely
stopped the ball from rolling?
A.
B.
C.
D.
mass
gravity
friction
inertia
Susan plays a game of marbles
with John. She tries to knock
John's marble out of the circle.
She rolls her marble and it hits
John's marble. How would John's
marble move after being hit?
A.
B.
C.
D.
CRCT Prep
The picture below shows a light bulb.
The bottom of this light bulb is an example
of what type of simple machine?
A. a lever
B. a pulley
C. a screw
D. a wedge
The picture below shows a staircase.
A staircase is most like what type of simple
machine?
A. lever
B. wedge
C. inclined plane
D. wheel and axle
Look at the bicycles below.
Why would the smaller bicycle take more work
to ride?
A. Smaller pedals are harder to push.
B. Smaller seats have less room to sit on.
C. Smaller handlebars are harder to steer.
D. Smaller wheels have to turn more often.
The picture below shows an antique piano
stool.
This piano stool uses what type of simple
machine to adjust the height?
A. wedge
B. screw
C. pulley
D. lever
The picture below shows tongs.
The tongs work as which of the following
simple machines?
A. inclined plane
B. lever
C. pulley
D. wedge
When you bend your arm at the elbow,
the bones and muscles in your arm are
acting like a system. What simple
machine does this system represent?
A. Inclined plane
B. Pulley
D. Wedge
E. lever
Which of the following shows an inclined
plane being used?
A.
B.
C.
D.
Velocity & Acceleration
CRCT Prep
Which of the following graphs
represents a train moving at constant
speed?
A.
B.
C.
D.
Which of the following is certain to
change as a ball accelerates?
A. mass of the ball
B. inertia of the ball
C. velocity of the ball
D. force acting on the ball
The graph below relates the speed and
time of four cars (1, 2, 3, and 4) traveling
along a straight highway.
Which two cars
move with zero
acceleration?
A. 1 and 4
B. 2 and 3
C. 1 and 2
D. 3 and 4
This graph shows the velocity of a car.
Which statement best explains how the
car is moving?
A. Velocity is increasing, so
the car is accelerating.
B. Velocity is decreasing, so
the car is accelerating.
C. Velocity is increasing, so
the car is not accelerating.
D. Velocity is decreasing, so
the car is not accelerating.
A school bus was stopped. After a
short time it was going 55 miles per
hour. This is evidence that the school
bus
A. had inertia.
B. had gravity.
C. lost energy.
D. had accelerated.