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Practice Exam Answers

23 verified answers
1
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What is the energy of a photon with a frequency of 1 point 7 times 10 to the 17th power Hz ? Planck’s constant is 6 point 6 3 times 10 to the negative 34 power times cap j times s

A
8 point 3 times 10 to the negative 15 power cap j
B
1 point 1 times 10 to the negative 16 power cap j
C
8 point 3 times 10 to the negative 16 power cap j
D
1 point 1 times 10 to the negative 17 power cap j
2
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Which statements describe the use of gamma rays to treat cancer? Choose two correct answers.

A
Gamma rays kill cancer cells in a tumor.
B
Gamma rays have low energy and a source must be placed in the body.
C
Gamma rays are applied to a large area of the body.
D
High-energy gamma rays are directed at a tumor from outside of the body.
E
Gamma rays are absorbed by only the cancer cells.
3

An incident ray of light strikes a diamond at an angle of 45 degrees The index of refraction of air is 1 point 0 0 0 3 and the index of refraction of a diamond is 2 point 4 2 What is the angle of refraction rounded to the nearest whole number?

A
45 degrees
B
17 degrees
C
2 degrees
D
19 degrees
4

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 2 5 seconds
B
0 point 5 0 seconds
C
2 point 0 seconds
D
4 point 0 seconds
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
superposition principle
B
vector principle
C
angle principle
D
summation principle
7

How do electric field lines indicate the strength of the field?

A
by the direction the lines are pointing
B
by how close the lines are
C
by showing the charge that creates the lines
D
by how long the lines are
8

Which best describes the present-day universe?

A
opaque, expanding at an accelerated rate, stars produce only hydrogen and helium
B
opaque, expanding very slowly, stars produce heavy elements
C
transparent, expanding very slowly, stars produce only hydrogen and helium
D
transparent, expanding at an accelerated rate, stars produce heavy elements
9

A patient is receiving treatments for brain cancer. Which electromagnetic waves are most likely being used as part of the treatment?

A
gamma ray
B
microwave
C
infrared
D
ultraviolet
11

Trent builds a model electric motor. When he connects a battery to the motor, the motor spins through a half rotation and stops. Which is the most likely solution to the problem?

A
replacing the battery, because it is not providing current
B
checking the commutator, because the current is not reversing
C
adding more wire coils in the armature, because the electromagnet is too weak
D
installing new brushes, because they are not making a good connection
12

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
0 point 1 0 kWh
B
100 kWh
C
0 point 3 8 kWh
D
380 kWh
13

Which concept was supported by taking measurements of the same stars at night and then again during solar eclipses?

A
principle of equivalence
B
gravitational redshift
C
gravitational lensing
D
gravitational time dilation
14

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

A
For large nuclei, the mass of the original nucleus is less than the mass of the products.
B
For large nuclei, the mass of the original nucleus is greater than the mass of the products.
C
For small nuclei, the binding energy of the lighter nuclei is less than the binding energy of the heavier nucleus.
D
For small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.
15

What are some applications of the field of spectroscopy? Choose five correct answers.

A
for identifying elements in a sample
B
for killing bacteria in foods
C
for determining the distance and velocity of galaxies
D
for producing neon lights
E
for use in medical imaging devices
F
for determining types of chemical bonds
16

According to Einstein’s first postulate about the special theory of relativity, which best explains why a person feels like he or she is sitting still on a train that is moving at a constant speed of 60 miles per hour?

A
The train is moving more slowly than the speed of light.
B
The reference frame of the person is inside the train.
C
The person is moving at the same speed as the train.
D
The motion of the train and of the person are not relative to each other.
17

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 will flow directly from the metal wires along 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 that are moving through the gas will be conducted through the glass and shock the fly.
18

What is the current in a circuit with a 9 point 0 cap v battery and a resistance of 36 point 0 cap omega ?

A
324 cap A
B
45 cap A
C
0 point 2 5 cap A
D
4 point 0 cap A
19

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

A
A longitudinal wave does not need a medium to travel through.
B
A transverse wave is made of particles that move perpendicular to the motion of the wave.
C
A longitudinal wave always travels faster than a transverse wave.
D
A transverse wave always carries more energy so that it can travel through empty space.
20

Which best compares concave and plane mirrors?

A
Plane mirrors produce only real images, and concave mirrors produce real and virtual images.
B
Plane mirrors produce only virtual images, and concave mirrors produce real and virtual images.
C
Concave mirrors produce only real images, and convex mirrors produce real and virtual images.
D
Concave mirrors produce only virtual images, and convex mirrors produce real and virtual images.
21

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

A
traveling faster than the speed of light
B
having long wavelengths
C
having high frequencies
D
transferring high amounts of energy
22

Which is an everyday example of a diffraction grating?

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

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