Medical Tests Medical Tests Certifications MCAT-TEST Questions & Answers

• Question 81:

  Red lead commonly known as 'Sandur' is represented by formula:

  A. PbO

  B. Pb3O4

  C. PbCrO4

  D. PbCO3

  Correct Answer: B

• Question 82:

  What happens if a reaction is at equilibrium state and some more reactants are added in container?

  A. The equilibrium will not be affected.

  B. The reverse reaction rate will increase.

  C. The forward reaction rate will increase.

  D. The forward reaction rate will decrease.

  Correct Answer: C

• Question 83:

  How much heat energy is required when 8 grams of hydrogen are burnt? The thermal reaction is:

  2H2 + O2 2H2O + 136.64 kcal

  A. 273.56 kcal

  B. 68.32 kcal

  C. 136.64 kcal

  D. 102.48 kcal

  Correct Answer: A

• Question 84:

  Which of the following is NOT a commonly occurring sulfur compound?

  A. H2SO4

  B. H2S

  C. SO3

  D. SO2

  Correct Answer: C

• Question 85:

  The most active non-metal has:

  A. medium electronegativity.

  B. high electronegativity.

  C. low electronegativity.

  D. large atom radii.

  Correct Answer: B

• Question 86:

  A compound, whose molecular mass is 90 grams, contains 40% carbon, 6.67% hydrogen and 53.33% oxygen. What is the true formula of the compound?

  A. CH2O4

  B. C3H6O

  C. C3HO3

  D. C2H2O4

  Correct Answer: C

• Question 87:

  Which of these is NOT true about ultrasound waves?

  A. The medium (type of tissue) affects the propagation speed.

  B. If frequency increases, wavelength increases as well.

  C. The resolution of images depends on the wavelength.

  D. Propagation speed is higher through solids than through liquids.

  Correct Answer: B

  Actually, if an ultrasound frequency increases, its wavelength decreases. All of the other answer choices are true.

• Question 88:

  One distinguishing factor in a redox titration, as opposed to other titrations, is that it involves:

  A. the determining of an unknown concentration in one reactant.

  B. the quantitative analysis of a substance.

  C. the use of a known concentration.

  D. the use of oxidation and reduction.

  Correct Answer: D

  This is the only answer choice that is unique to a redox titration. The other choices are common to various types of titrations.

• Question 89:

  If an object of mass 4 kg is suspended at a height of 5 m on Earth and acceleration due to gravity is 9.8 m/s2, what is its potential energy?

  A. 150 J

  B. 142 J

  C. 196 J

  D. 216 J

  Correct Answer: C

  Potential Energy = Mass x Height x Acceleration due to gravity.

• Question 90:

  According to Boyle's Law, if a gas expands in volume from 5 L to 10 L and has an initial pressure of 1 atm, what is the final pressure?

  A. 5 atm

  B. 2 atm

  C. 0.5 atm

  D. 1 atm

  Correct Answer: C

  Boyle's Law states that P1V1 = P2V2.