Practice Exam

Question 1

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

Revolt · Accepted Answer

D: 8 point 0  seconds

Question 2

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?

Revolt · Accepted Answer

D: 65

Question 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?

Revolt · Accepted Answer

C: 8 point 5 times 10 squared cap t

Question 4

Which change can make a generator stronger?

Revolt · Accepted Answer

A: increasing the number of coils in the armature

Question 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?

Revolt · Accepted Answer

A: The reference frame of the person is inside the train.

Question 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?

Revolt · Accepted Answer

B: 17 degrees

Question 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?

Revolt · Accepted Answer

D: The fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal.

Question 8

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

Revolt · Accepted Answer

A: The collector and the emitter are p-type, and the base is n-type.

Question 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.

Revolt · Accepted Answer

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.

Question 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

Revolt · Accepted Answer

2.2e-4

Practice Exam Answers

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