Diagnostic Test - Physics
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| This test is comprised of 10 items, which must be completed within 12.5 minutes. Each test item is a question or incomplete statement followed by suggested answers or completions. Read the item, decide which choice is best, and select the answer with the mouse.You can use the identical on-screen calculator under the “Exhibit” button. A navigation bar is provided, enabling you to skip between questions easily and mark questions for review. |
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Categories
- DC Circuits 0%
- Dynamics 0%
- Electrostatics 0%
- Energy and Momentum 0%
- Fluid Statics 0%
- Linear Kinematics 0%
- Magnetism 0%
- Optics 0%
- Rotational Motion 0%
- Simple Harmonic Motion 0%
- Statics 0%
- Thermodynamics 0%
- Units and Vectors 0%
- Waves 0%
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Estimated OAT Physics Score: 200
Just know, when you truly want success, you’ll never give up on it. No matter how bad the situation may get. Keep your head up and keep on fighting! -
Estimated OAT Physics Score: Lower than 250
Just know, when you truly want success, you’ll never give up on it. No matter how bad the situation may get. Keep your head up and keep on fighting! Learn from your mistakes so you don’t repeat them on the next exam. -
Estimated OAT Physics Score: 260
You’re on the right track. Take your time to reflect on your performance and how you can improve your scores the next time around. Carefully review these solutions, learn from your mistakes and understand the intricacies of each question. You’re going in the correct direction and you’ll only go up from here! -
Estimated OAT Physics Score: 270
You’re on the right track. Take your time to reflect on your performance and how you can improve your scores the next time around. Carefully review these solutions, learn from your mistakes and understand the intricacies of each question. You’re going in the correct direction and you’ll only go up from here! -
Estimated OAT Physics Score: 280
You’re on the right track. Take your time to reflect on your performance and how you can improve your scores the next time around. Carefully review these solutions, learn from your mistakes and understand the intricacies of each question. You’re going in the correct direction and you’ll only go up from here! -
Estimated OAT Physics Score: 290
You’re doing a good job! Keep working on it and you’ll soon see your score in the 300’s. Take your time in understanding your mistakes and in carefully reviewing these solutions and learning from he intricacies of each question. -
Estimated OAT Physics Score: 300
You hit 300! But it shouldn’t stop here! Take your time in understanding your mistakes and in carefully reviewing these solutions and understanding the intricacies of each question. Your goal should be to beat your 300 on the next test! -
Estimated OAT Physics Score: 310
Good going! You are really getting to where you need to be. Keep it going! Keep on working on it and you’ll soon see your scores climb. Take your time in understanding your mistakes and in carefully reviewing these solutions and understanding the intricacies of each question. Your goal should be to beat your 17 on the next test! -
Estimated OAT Physics Score: 320
Good going! You are really getting to where you need to be. Keep it going! Keep on working on it and you’ll soon see your score take off from here. Take your time in understanding your mistakes and in carefully reviewing these solutions and understanding the intricacies of each question. Your goal should be to beat your 18 on the next test! -
Estimated OAT Physics Score: 330
Awesome job! Keep it up and you’ll soon be in the upper 300’s. Learn from your mistakes and strategize on how you’ll beat your 330! -
Estimated OAT Physics Score: 340
Awesome job! You did it! You hit the 340 mark. You really outdid yourself today. Let’s shoot for 350+ next time, what do you say?! -
Estimated OAT Physics Score: 350
Impressive! You’re coming along very nicely! What’s one thing you could have done differently in this test that would have pushed you higher? -
Estimated OAT Physics Score: 360
You rocked it! That was quite an accomplishment! Think about what you could have done differently to get you up to a perfect 400? -
Estimated OAT Physics Score: 370
You are a rockstar! We tip our hats to you! -
Estimated OAT Physics Score: 380 or higher
You are a rockstar! We tip our hats to you!
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Question 1 of 10
1. Question
You are tinkering with capacitors, and decide to add a insulator to the mix. How would that change the stored energy, considering the charge stays constant?
CorrectSolution:
Having a insulator influences the electrons to decrease the electric field. This would in turn cause a decrease in potential difference. Since potential difference directly corresponds to stored energy, this will decrease as well.
Why the other choices are wrong:
Insulators work by stopping the flow of energy through electric polarization.
[vimeo 171677742]
IncorrectSolution:
Having a insulator influences the electrons to decrease the electric field. This would in turn cause a decrease in potential difference. Since potential difference directly corresponds to stored energy, this will decrease as well.
Why the other choices are wrong:
Insulators work by stopping the flow of energy through electric polarization.
[vimeo 171677742]
Exhibit
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Question 2 of 10
2. Question
Two crates, stacked on top of each other, are placed on the back of a truck. How many different forces (normal, frictional, and gravitational) are in play among the top crate, bottom crate, and/or the truck?
Correct
[vimeo 171686651]
Incorrect[vimeo 171686651]
Exhibit
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Question 3 of 10
3. Question
A negatively charged sphere is moved near two neutral spheres (W and X). Then, we put sphere X near an electroscope (Y). After, we touch sphere W to another electroscope (Z). What are the charge orientations of electroscopes Y and Z, respectively?
CorrectSolution:
The negatively charged sphere will make spheres W and X positive through induction. This would then make electroscopes Y and Z positive.
Why the other choices are wrong:
Remember the three ways charges can take place. Also, it doesn’t matter if the sphere is close or touching the electroscope.
IncorrectSolution:
The negatively charged sphere will make spheres W and X positive through induction. This would then make electroscopes Y and Z positive.
Why the other choices are wrong:
Remember the three ways charges can take place. Also, it doesn’t matter if the sphere is close or touching the electroscope.
Exhibit
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Question 4 of 10
4. Question
You go to buy a TV from BestBuy; you push a cart with a force of 30 N across a distance of 40 meters to your car on a hill with an angle of 60. What is the work (J) done on the cart?
CorrectSolution:
Work = F*d*cosθ
Work = (30N)(40m)cos(60)
Work = 1200(0.5) = 600 JWhy the other choices are wrong:
You used either the wrong angle or wrong trig function
[vimeo 171708339]
IncorrectSolution:
Work = F*d*cosθ
Work = (30N)(40m)cos(60)
Work = 1200(0.5) = 600 JWhy the other choices are wrong:
You used either the wrong angle or wrong trig function
[vimeo 171708339]
Exhibit
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Question 5 of 10
5. Question
A hydraulic lift has amazing mechanical advantage. Just a little force on one end can lift insanely heavy objects. Pascal’s principle explains this; how is this possible?
CorrectSolution:
Pascal’s principle states that pressure is transmitted undiminished in an enclosed static fluid. This means that any externally applied pressure is transmitted to all parts of the enclosed fluid, making possible a large multiplication of force.
Why the other choices are wrong:
A) The material does not matter
B) You body isn’t the aspect creating the large mechanical advantage
D) Gravity doesn’t play the leading role
E) It is made of few parts, and it’s the pressure causing the multiplier, not the parts[vimeo 171708456]
IncorrectSolution:
Pascal’s principle states that pressure is transmitted undiminished in an enclosed static fluid. This means that any externally applied pressure is transmitted to all parts of the enclosed fluid, making possible a large multiplication of force.
Why the other choices are wrong:
A) The material does not matter
B) You body isn’t the aspect creating the large mechanical advantage
D) Gravity doesn’t play the leading role
E) It is made of few parts, and it’s the pressure causing the multiplier, not the parts[vimeo 171708456]
Exhibit
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Question 6 of 10
6. Question
Using the table below, determine the average acceleration (m/s2)
Time (s) Velocity (m/s) 0 0 5 15 15 45 35 105 70 210 CorrectSolution:
a = Δv/t
a = (210 – 0)/(70-0)
a = 3 m/s2Why the other choices are wrong:
B, C, D.) You divided by the wrong points; you need to keep them consistent
[vimeo 171709541]
IncorrectSolution:
a = Δv/t
a = (210 – 0)/(70-0)
a = 3 m/s2Why the other choices are wrong:
B, C, D.) You divided by the wrong points; you need to keep them consistent
[vimeo 171709541]
Exhibit
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Question 7 of 10
7. Question
Which law deals with any change in the magnetic environment of a coil of wire that causes a voltage to be induced in the coil?
CorrectSolution:
Voltage generated = -NΔ(BA)/Δt
Why the other choices are wrong:
A) Induced current flows in the direction that opposes the change that created it
B) For any closed loop, sum of elements times magnetic field equals permeability times electric current
C) Relates the distribution of electric charge to the resulting electric field
D.) Square inverse relationship between charge and distanceIncorrectSolution:
Voltage generated = -NΔ(BA)/Δt
Why the other choices are wrong:
A) Induced current flows in the direction that opposes the change that created it
B) For any closed loop, sum of elements times magnetic field equals permeability times electric current
C) Relates the distribution of electric charge to the resulting electric field
D.) Square inverse relationship between charge and distanceExhibit
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Question 8 of 10
8. Question
What is the speed (km/s) of a ray of light in a medium which has a refractive index of 10?
CorrectSolution:
Speed of light is 3 x 108 m/s or 300,000 km/s
Refractive index = speed of light/ speed in specific medium10 = 300,000 /v
v = 30,000Why the other choices are wrong:
The higher the RI, the slower the speed, so E) doesn’t make sense. The rest are the wrong multiplier.
IncorrectSolution:
Speed of light is 3 x 108 m/s or 300,000 km/s
Refractive index = speed of light/ speed in specific medium10 = 300,000 /v
v = 30,000Why the other choices are wrong:
The higher the RI, the slower the speed, so E) doesn’t make sense. The rest are the wrong multiplier.
Exhibit
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Question 9 of 10
9. Question
You decide to take a break from all this physics and head to the amusement park and get on your favorite roller coaster. As the roller coaster climbs to the top and is just about to drop down, you get a sense of dread and realize that physics has not left you. If the cart weighs 100 kg and goes at 14 m/s over the top of a loop with a radius of 49 m, use Newton’s second law to find the net force acting on you. Assume the acceleration of gravity is 10 m/s
CorrectSolution:
Fgravity = m * g
Fgravity = 100 kg * 10 m/s
Fgravity = 1000 NFapp:
a = v2/R
= (15 m/s)2/(49 m)
= 4 N
Fapp = ma
Fapp = 100kg * 4 N
Fapp = 400 NFnet = Fgravity + Fapp
Fnet = 1000N + 400N = 1400NWhy the other choices are wrong:
There are two components to finding the net force in this example. If you picked A, you only considered gravity. For the other wrong choices, you didn’t use the formula a = v2/R correctly.
[vimeo 172350875]
IncorrectSolution:
Fgravity = m * g
Fgravity = 100 kg * 10 m/s
Fgravity = 1000 NFapp:
a = v2/R
= (15 m/s)2/(49 m)
= 4 N
Fapp = ma
Fapp = 100kg * 4 N
Fapp = 400 NFnet = Fgravity + Fapp
Fnet = 1000N + 400N = 1400NWhy the other choices are wrong:
There are two components to finding the net force in this example. If you picked A, you only considered gravity. For the other wrong choices, you didn’t use the formula a = v2/R correctly.
[vimeo 172350875]
Exhibit
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Question 10 of 10
10. Question
The k constant for a particular spring is 54 N/m with a 6 kg weight attached to its end. If the weight is released 2 m from its equilibrium position, what is the maximum acceleration (m2/s) of the mass?
CorrectSolution:
Acceleration in this case can be given by:
a = A(k/m)
a = 2(54/6)
a = 18Why the other choices are wrong:
Another way to look at this is to realize that:
a = Aw2
since w = √(k/m),
a =A(k/m)
[vimeo 172351081]
IncorrectSolution:
Acceleration in this case can be given by:
a = A(k/m)
a = 2(54/6)
a = 18Why the other choices are wrong:
Another way to look at this is to realize that:
a = Aw2
since w = √(k/m),
a =A(k/m)
[vimeo 172351081]
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