Test Prep OAT Online Practice Questions and Exam Preparation

Test Prep OAT Online Questions & Answers

• Question 121:

  A lead sphere 10 centimeters in diameter is attached to a 10-meter wire and suspended from a beam in a large warehouse. A lead sphere 1 meter in diameter is hung next to the smaller sphere, almost touching. Ignoring friction, which statement is true?

  A. The small sphere will move slightly towards the big sphere, but the big sphere will not move.
  B. The big sphere will move slightly toward the small sphere, but the small sphere will not move.
  C. Neither sphere will move.
  D. Both spheres will move slightly towards each other.
  D. Both spheres will move slightly towards each other.

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  There will be a gravitational force of attraction between the two spheres determined by the universal constant of gravity, the distance between the spheres, and the mass of the spheres. Since both objects are affected by this force (remember, Newton's 3rd law says the force needs to be equal and opposite), both objects will experience a slight acceleration and start moving towards each other a tiny amount (when we ignore friction). Using F = ma, you know that the less massive sphere will experience a larger acceleration than the more massive one.

• Question 122:

  Which of the following compounds is the weakest acid?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  E. Option E
  B. Option B

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  Understanding how to solve these type of problems where a benzene has various substituents that alter its pH depends on understanding electron-withdrawing substituents (fluorine and chlorine) and electron-donating substituents (hydroxyl and methyl, with the former being more powerful). The electron-donating substituents destabilize the nitrogen's lone pair of electrons, thus increasing its reactivity and making it more basic (less acidic).

• Question 123:

  A spring is sitting in an equilibrium position. What would happen to the force of the spring if you pulled the spring to a length double of that of its equilibrium?

  A. Force would half
  B. Force would stay the same
  C. Force would double
  D. Force would quadruple
  E. Not enough information is provided
  C. Force would double

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  F = -kx; where x = displacement from the equilibrium position Doubling the displacement (x) would double the force (F).

• Question 124:

  On a bad day, have you ever been irritable? Have you ever used a harsh tone or even been verbally disrespectful to your parents or teachers? Everyone has a short temper from time to time, but current statistics indicate that between 16% and 20% of a school population suffer from a psychological condition known as Oppositional Defiance Disorder, or ODD.

  ODD symptoms include difficulty complying with adult requests, excessive arguments with adults, temper tantrums, difficulty accepting responsibility for actions, low frustration tolerance, and behaviors intended to annoy or upset adults. Parents of children with ODD can often feel as though their whole relationship is based on conflict after conflict.

  Unfortunately, ODD can be caused by a number of factors. Some students affected by ODD suffer abuse, neglect, and severe or unpredictable discipline at home. Others have parents with mood disorders or have experienced family violence. Various types of therapy are helpful in treating ODD, and some drugs can treat particular symptoms. However, no single cure exists.

  The best advice from professionals is directed toward parents. Therapists encourage parents to avoid situations that usually end in power struggles, to try not to feed into oppositional behavior by reacting emotionally, to praise positive behaviors, and to discourage negative behaviors with timeouts instead of harsh discipline.

  The author's purpose in writing this passage is to:

  A. Prove that parents are the cause of ODD.
  B. Express frustration about ODD.
  C. Inform the reader about this complex condition.
  D. Persuade the reader to keep students with ODD out of public school.
  C. Inform the reader about this complex condition.

• Question 125:

  The breakdown of a disaccharide releases energy which is stored as ATP. This is an example of a(n):

  A. Thermodynamic reaction
  B. Exothermic reaction
  C. Combination reaction
  D. Replacement reaction
  E. Endothermic reaction
  B. Exothermic reaction

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  An exothermic reaction releases energy, whereas an endothermic reaction requires energy. The breakdown of a chemical compound is an example of a decomposition reaction (AB ?gt; A + B). A combination reaction (A + B ?gt; AB) is the reverse of a decomposition reaction, and a replacement (displacement) reaction is one where compound breaks apart and forms a new compound plus a free reactant (AB + C ?gt;AC + B or AB + CD ?gt; AD + CB).

• Question 126:

  If Keq < 1, then which of the following is correct in regards to the equilibrium mixture?

  A. Contains less reactants than products.
  B. Contains less products than reactants.
  C. There is equal amounts of products and reactants.
  D. Contain more products than reactants.
  E. None of the above.
  B. Contains less products than reactants.

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  If Keq > 1, then the equilibrium reaction will contain less reactants than products.

• Question 127:

  What is the oxidation state of nitrogen in the following compound: NaN3?

  A. +1/3
  B. +3
  C. +5
  D. -1/3
  E. -5
  D. -1/3

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  The entire compound has a charge of 0. Thus, giving Na's +1 oxidation state: 1 + 3x = 0 The 3x represents the nitrogen (3 of them, x being the unknown oxidation number), the 1 represents the +1 oxidation number of Na and finally the 0 being the neutral charge of the entire compound. Solving for x: 3x = -1

  x = -1/3

• Question 128:

  A square has an area of 36. If you doubled the length of the sides of the square, what will its new perimeter be?

  A. 24
  B. 36
  C. 48
  D. 52
  E. 72
  C. 48

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  If a square has an area of 36, it's sides must be 6, as s2 = area of a square.

  Doubling the side of the square gives 12. Add all 4 sides (12 + 12 + 12 + 12) and you have a perimeter of 48.

• Question 129:

  PLASTICS

  Plastics have long been considered one of the great conveniences of the modern era, but evidence is mounting to indicate that these conveniences have come at an incredible cost. The chief benefit of plastics is their durability, but this benefit turns out to be the same reason plastic has become a significant problem: It takes 200 to 400 years to decompose. All of this plastic has accumulated into a catastrophic mess and has also caused disease in humans.

  Between Hawaii and Japan, a giant mass of plastic twice the size of Texas slowly swirls with the currents of the Pacific Ocean. This area has come to be known as the Great Pacific Garbage Patch, and its effects on the ecology of the ocean are unimaginable. According to United Nations researchers, a hundred thousand sea mammals and a million seabirds die each year. They are found with cigarette lighters, syringes, and other plastics that they mistake for food in their stomachs.

  Evidence also indicates that the plastic receptacles that people store their food in poses health risks. For instance, phthalates have been shown to have detrimental effects on the reproductive system, yet they are found in many plastic products including baby bottles and water bottles. They have also been linked to various forms of cancer. Additionally, a chemical called bisphenol A that is found in many plastics can mimic the effects of the hormone estrogen, which can also affect the reproductive system.

  Which of the following statements can be inferred from paragraph two?

  A. No one has determined why sea mammals and seabirds are dying at an alarming rate.
  B. The Great Pacific Garbage Patch is not a significant threat to humans.
  C. The Great Pacific Garbage Patch is too large to be cleaned up by one country.
  D. Ocean currents carry the plastic to the middle of the ocean.
  D. Ocean currents carry the plastic to the middle of the ocean.

• Question 130:

  A small t-shirt store sells two different kinds of shirts: short sleeve cost $15.00 and long sleeve cost $18.00. If the store sold 21 shirts last night and made $351, how many of each kind of shirt did the store sell?

  A. 9 short sleeve and 12 long sleeve
  B. 6 short sleeve and 9 long sleeve
  C. 8 short sleeve and 11 long sleeve
  D. 7 short sleeve and 10 long sleeve
  A. 9 short sleeve and 12 long sleeve

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  If x denotes short sleeve shirt and y denotes long sleeve shirt, x + y = 21 and 15x + 18y = 351 15 (21 - y) + 18y = 351 315 - 15y + 18y = 351 3y = 36 y = 12 and x = 9