OAT Online Practice Questions and Answers

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 best summarizes the main idea of this passage?

A. The benefits of plastics outweigh their risks.

B. Plastics decompose very slowly.

C. Plastics pose a significant threat to humans and other living creatures.

D. Phthalates should not be used in baby bottles.

Maria leaves her house and drives to store 'A' for food, then to gas station 'B' and finally back to home. What was her total displacement?

A. 0 miles

B. 5 miles

C. 12 miles

D. 24 miles

E. 27 miles

A man lifts a 200 lb rock from the floor to a height 6 feet of the ground. How much work must the man perform in order to keep the object in the air?

A. 1200 ft lb

B. 33.3 ft lb

C. 0 ft lb

D. 2000 ft lb

E. Not enough information is provided

A bowling ball with a mass of 4 kilograms moving at a speed of 10 meters per second hits a stationary 1 kg bowling ball in a head-on elastic collision. What is the speed of the stationary ball after the collision?

A. 0 m/s

B. 10 m/s

C. Less than 10 m/s, but not 0 m/s

D. More than 10 m/s

Which statement correctly describes the elastic limit of a metal rod?

A. The elastic limit occurs when a deformed object will no longer return to its original shape.

B. The elastic limit occurs when the rod breaks.

C. The elastic limit occurs when the stress stops producing a strain.

D. The elastic limit assumes that the forces between molecules in a metal act like springs.

A square has a perimeter of x and an area of 2x. What is x?

A. 8

B. 16

C. 20

D. 24

E. 32

8 dogs must line up behind each other in single file to get a treat. How many different ways can the dogs line up?

A. 8

B. 16

C. 64

D. 320

E. 40320

Which of the following answer choices incorrectly pairs the germ layer and the structure it gives rise to?

A. Ectoderm – central nervous system

B. Mesoderm – connective tissue

C. Endoderm – liver

D. Mesoderm – muscles

E. Endoderm – lens of the eye

Jellyfish possess what type of circulatory system?

A. Closed circulatory system

B. Open circulatory system

C. Dorsal vessel

D. Double circulatory system

E. It has no circulatory system

Which of the following structure and function are linked incorrectly below?

A. Epididymis – stores sperm

B. Oviduct – site of fertilization

C. Vas deferens – transports the sperm to the urethra

D. Seminal vesicles – gives sperm alkaline based protection to neutralize acidity of vagina

E. None of the above

Which of the following is a component of bacterial cell wall?

A. Chitin

B. Cellulose

C. Peptidoglycan

D. All of the above

E. None of the above

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

Organisms that utilize solar energy to exist are called:

A. Apotrophic

B. Autotrophic

C. Heterotrophic

D. Chemotrophic

E. Mixotrophic

A mythical atom has isotopes: 10X, 11X and 12X with masses 10, 11, and 12 respectively. 10X has an abundance of 80%, 11X of 15% and 12X of 5%. What is the atomic mass of this X atom?

A. 10

B. 10.25

C. 10.75

D. 11

E. 11.25

What is the molecular geometry of BF3?

A. Linear

B. Tetrahedral

C. Trigonal Planar

D. T-shaped

E. Square planar