AnswersPhysicsN/A

Practice Exam Answers

25 verified answers1 views
1
Free Preview

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 greater than the mass of the products.
B
For small nuclei, the binding energy of the lighter nuclei is greater than the binding energy of the heavier nucleus.
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.
2
Free Preview

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

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

A
High-energy gamma rays are directed at a tumor from outside of the body.
B
Gamma rays have low energy and a source must be placed in the body.
C
Gamma rays kill cancer cells in a tumor.
D
Gamma rays are applied to a large area of the body.
E
Gamma rays are absorbed by only the cancer cells.
4

How is the electromagnetic force different than both the gravitational force and the strong nuclear force?

A
It holds protons together.
B
It has an infinite range.
C
It is repulsive.
D
It acts at the subatomic level.
5

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 be put inside the box so the two ends join.
B
None should be put inside the box.
C
They should form loops outside of the box over the top, bottom, and sides of the box.
D
They should form loops outside of the box, but over only the sides of the box.
E
They should exit the box at N and enter at S.
F
They should exit the box at S and enter at N.
6

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

A
ultraviolet
B
gamma ray
C
microwave
D
infrared
7

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:

4.74×10^-6 F

8

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
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.
C
Both rays continue moving in the same direction.
D
Ray X continues moving in the same direction, and ray Y refracts and passes through the focal point located behind the lens.
9

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
17 degrees
B
2 degrees
C
19 degrees
D
45 degrees
10

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

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 2 times 10 squared cap t
B
6 point 4 times 10 to the 10th power cap t
C
8 point 5 times 10 squared cap t
D
3 point 2 times 10 cubed cap t
13

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 by the field of the solenoid and decreases the magnetic field strength.
D
It is magnetized and induces a current in the solenoid to decrease the magnetic field strength.
14

Which is an everyday example of a diffraction grating?

A
Image with description A picture of bubbles.
B
Image with description A picture of the bottom of a CD or DVD showing rainbow lies going out from the center.
C
Image with description A picture of wave peaks in water.
D
Image with description A picture of an upright mirror.
15

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

A
gravitational time dilation
B
gravitational lensing
C
principle of equivalence
D
gravitational redshift
16

A charge of 40 µC is pushed by a force of 15 µN a distance of 1 point 3 millimeters in an electric field. What is the electric potential difference?

A
3 point 8 times 10 inverse cap v
B
4 point 9 times 10 to the negative 4 power cap v
C
2 point 0 times 10 to the negative 8 power cap v
D
4 point 6 times 10 to the negative 7 power cap v
17

Which best compares concave and plane mirrors?

A
Plane mirrors produce only real images, and concave 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 virtual images, and concave mirrors produce real and virtual images.
D
Concave mirrors produce only virtual images, and convex mirrors produce real and virtual images.
19

Which type of circuit is a continuous loop that allows the flow of current along its intended path?

A
inverted
B
open
C
closed
D
short
20

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
summation principle
C
angle principle
D
vector principle
21

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

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

Did you find these answers helpful?

More from this Course

Quiz
48 verified answers

Exam

practice test
16 verified answers

Practice Test

Quiz
23 verified answers

Test