AnswersPhysics in the UniverseN/A

Practice Exam Answers

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1
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Which change can make a generator stronger?

A
decreasing the size of the slip rings
B
increasing the size of the slip rings
C
decreasing the number of coils in the armature
D
increasing the number of coils in the armature
2
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How do electric field lines indicate the strength of the field?

A
by how long the lines are
B
by how close the lines are
C
by the direction the lines are pointing
D
by showing the charge that creates the lines
3

A 40 cap w bulb is left on from 9:00 p.m. to 6:30 a.m. How much energy was used by the bulb?

A
100 kWh
B
0 point 1 0 kWh
C
380 kWh
D
0 point 3 8 kWh
4

What is the main difference between a longitudinal wave and a transverse wave?

A
A longitudinal wave always travels faster than a transverse wave.
B
A transverse wave is made of particles that move perpendicular to the motion of the wave.
C
A longitudinal wave does not need a medium to travel through.
D
A transverse wave always carries more energy so that it can travel through empty space.
5

Which principle states that the net electrical force on a specific charge is equal to the sum of the vector components of the charges applying forces on it?

A
angle principle
B
superposition principle
C
summation principle
D
vector principle
6

Which statements describe the use of gamma rays to treat cancer? Choose two correct answers.

A
Gamma rays have low energy and a source must be placed in the body.
B
Gamma rays kill cancer cells in a tumor.
C
Gamma rays are absorbed by only the cancer cells.
D
Gamma rays are applied to a large area of the body.
E
High-energy gamma rays are directed at a tumor from outside of the body.
7

What would happen if gravity did not pull dust and gas together after the Big Bang?

A
Stars and galaxies would never form.
B
Heavier elements like carbon and oxygen would form earlier.
C
The cosmic microwave background would disappear.
D
The universe would collapse back into a singularity.
8

Which is an everyday example of a diffraction grating?

A
Image with description A picture of an upright mirror.
B
Image with description A picture of bubbles.
C
Image with description A picture of the bottom of a CD or DVD showing rainbow lies going out from the center.
D
Image with description A picture of wave peaks in water.
9

Which statement best describes the role of Type Ia supernovae in measuring cosmic distances?

A
They are the best method for measuring distances to planets within our solar system.
B
They are used to measure the universe's expansion by observing Cepheid variables.
C
They provide a more accurate measurement of star distances than parallax.
D
They serve as "standard candles" because they have a known luminosity, allowing distance calculations.
13

Which property makes radio waves ideal for carrying and transmitting data?

A
having long wavelengths
B
transferring high amounts of energy
C
traveling faster than the speed of light
D
having high frequencies
14

Which best describes the present-day universe?

A
opaque, expanding very slowly, stars produce heavy elements
B
opaque, expanding at an accelerated rate, stars produce only hydrogen and helium
C
transparent, expanding at an accelerated rate, stars produce heavy elements
D
transparent, expanding very slowly, stars produce only hydrogen and helium
16

A force of 1 point 5 times 10 squared cap n is exerted on a charge of 1 point 4 times 10 to the negative 7 power cap c that is traveling at an angle of 75 degrees to a magnetic field. If the charge is moving at 1 point 3 times 10 to the 6th power m/s , what is the magnetic field strength?

A
8 point 5 times 10 squared cap t
B
6 point 4 times 10 to the 10th power cap t
C
8 point 2 times 10 squared cap t
D
3 point 2 times 10 cubed cap t
17

Which statement describes why energy is released in a nuclear fission reaction based on mass-energy equivalence?

A
For small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.
B
For large nuclei, the mass of the original nucleus is greater than the mass of the products.
C
For large nuclei, the mass of the original nucleus is less than the mass of the products.
D
For small nuclei, the binding energy of the lighter nuclei is less than the binding energy of the heavier nucleus.
19

What is the purpose of the metal core in an electromagnet?

A
It is magnetized and induces a current in the solenoid to increase the magnetic field strength.
B
It is magnetized by the field of the solenoid and increases the magnetic field strength.
C
It is magnetized and induces a current in the solenoid to decrease the magnetic field strength.
D
It is magnetized by the field of the solenoid and decreases the magnetic field strength.
20

A neon light consists of a glass tube with metal wires at each end. When connected to a high-voltage source, the gas glows. If a fly lands on the glass tube, what will most likely happen?

A
The fly will not feel a shock because the glass conducts any free electrons back into the gas.
B
Electrons that are moving through the gas will be conducted through the glass and shock the fly.
C
The fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal.
D
Electrons will flow directly from the metal wires along the glass and shock the fly.
21

Hiro wants to model the magnetic field of a bar magnet using a shoe box and pipe cleaners. He labels the ends of the shoe box N and S. How should he position the pipe cleaners? Choose three correct answers.

A
They should form loops outside of the box over the top, bottom, and sides of the box.
B
They should exit the box at N and enter at S.
C
They should be put inside the box so the two ends join.
D
They should form loops outside of the box, but over only the sides of the box.
E
They should exit the box at S and enter at N.
F
None should be put inside the box.
22

Which applications, either for diagnostic purposes or for therapeutic purposes, involve radioactive materials placed in the body? Choose three correct answers.

A
MRI
B
lithotripsy
C
radioisotope imaging
D
radiopharmaceuticals
E
laser eye surgery
F
brachytherapy
G
external beam radiation therapy
23

A boy yells in a narrow valley. The sound reflects off of a boulder that is 80 m away. How long will it take to hear the echo if the speed of a sound wave is 320 m/s ? open paren speed is equal to distance over time close paren

A
0 point 5 0 seconds
B
4 point 0 seconds
C
0 point 2 5 seconds
D
2 point 0 seconds
26

What is the primary process responsible for the formation of mid-ocean ridges?

A
seafloor spreading at divergent boundaries
B
sediment accumulating from continental erosion
C
one tectonic plate subducting beneath another
D
magma rising from hotspots within tectonic plates
27

Which statement accurately describes the applications and limitations of absolute-age dating methods?

A
Dendrochronology is useful for dating rocks.
B
Radiocarbon dating can't be used to date materials older than 50,000 years.
C
Varves are best for dating dinosaur fossils.
D
Uranium-lead dating is the most precise method for dating organic material.

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