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Practice Exam Answers

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1
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How long does it take the wave to travel 6 point 0 m in the x -direction?

A
2 point 0 seconds
B
0 point 6 7 seconds
C
0 point 1 3 seconds
D
8 point 0 seconds
2
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According to the graph, what is the maximum age at which a 4000 Hz sound wave with an intensity of 20 dB would be heard?

A
70
B
60
C
55
D
65
3

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

Which change can make a generator stronger?

A
increasing the number of coils in the armature
B
decreasing the size of the slip rings
C
decreasing the number of coils in the armature
D
increasing the size of the slip rings
5

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 reference frame of the person is inside the train.
B
The person is moving at the same speed as the train.
C
The train is moving more slowly than the speed of light.
D
The motion of the train and of the person are not relative to each other.
6

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
2 degrees
B
17 degrees
C
45 degrees
D
19 degrees
7

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
Electrons that are moving through the gas will be conducted through the glass and shock the fly.
B
The fly will not feel a shock because the glass conducts any free electrons back into the gas.
C
Electrons will flow directly from the metal wires along the glass and shock the fly.
D
The fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal.
8

Which semiconductors are used in each of the three parts of a PNP transistor?

A
The collector and the emitter are p-type, and the base is n-type.
B
The base and the collector are p-type, and the emitter is n-type.
C
The base and the emitter are p-type, and the collector is n-type.
D
The emitter and the collector are n-type, and the base is p-type.
9

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
None should be put inside the box.
C
They should exit the box at N and enter at S.
D
They should exit the box at S and enter at N.
E
They should be put inside the box so the two ends join.
F
They should form loops outside of the box, but over only the sides of the box.
10

A power source supplies an electric potential difference of 9 point 0 cap v to the plates of a capacitor. The energy stored in the capacitor is 9 point 8 times 10 to the negative 4 power cap j The dielectric constant of the dielectric in the capacitor is 5 point 1

Answer:

2.2e-4

11

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
380 kWh
B
100 kWh
C
0 point 3 8 kWh
D
0 point 1 0 kWh
12

Which is an everyday example of a diffraction grating?

A
Image with description A picture of the bottom of a CD or DVD showing rainbow lies going out from the center.
B
Image with description A picture of bubbles.
C
Image with description A picture of wave peaks in water.
D
Image with description A picture of an upright mirror.
13

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

A
A transverse wave is made of particles that move perpendicular to the motion of the wave.
B
A longitudinal wave does not need a medium to travel through.
C
A transverse wave always carries more energy so that it can travel through empty space.
D
A longitudinal wave always travels faster than a transverse wave.
14

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

A
gravitational lensing
B
principle of equivalence
C
gravitational redshift
D
gravitational time dilation
15

Incident ray X passes parallel to the principal axis of a concave lens. Incident ray Y passes parallel to the principal axis of a convex lens. How do the rays behave differently after passing through each lens?

A
Both rays refract and move as though they passed through the focal point.
B
Both rays continue moving in the same direction.
C
Ray X continues moving in the same direction, and ray Y refracts and passes through the focal point located behind the lens.
D
Ray X appears as though it passed through the focal point in front of the lens, and ray Y passes through the focal point on the other side of the lens.
16

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 16 power cap j
B
8 point 3 times 10 to the negative 15 power cap j
C
1 point 1 times 10 to the negative 17 power cap j
D
1 point 1 times 10 to the negative 16 power cap j
17

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

A
by how long the lines are
B
by the direction the lines are pointing
C
by showing the charge that creates the lines
D
by how close the lines are
18

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
2 point 0 seconds
C
4 point 0 seconds
D
0 point 5 0 seconds
19

Which best compares concave and plane mirrors?

A
Concave mirrors produce only virtual images, and convex mirrors produce real and virtual images.
B
Concave mirrors produce only real images, and convex mirrors produce real and virtual images.
C
Plane mirrors produce only real images, and concave mirrors produce real and virtual images.
D
Plane mirrors produce only virtual images, and concave mirrors produce real and virtual images.
20

Question text not available

Answer:

vibrate

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