ATI TEAS 7
Chemistry
1. Which element is used in fertilizers due to its role in plant cell division and growth?
- A. Potassium
- B. Phosphorus
- C. Calcium
- D. Magnesium
Correct answer: B
Rationale: Phosphorus is crucial for cell division and metabolism, making it essential for plant growth and development.
2. What term describes the point where parallel rays of light converge or appear to diverge from after passing through a lens or reflecting off a mirror?
- A. Aperture
- B. Focal length
- C. Refractive index
- D. Lens thickness
Correct answer: B
Rationale: The focal length is the term that describes the point where parallel rays of light converge or appear to diverge from after passing through a lens or reflecting off a mirror. It is a crucial parameter in optics and is used to determine the magnification and image formation in optical systems. The other options (A) Aperture, (C) Refractive index, and (D) Lens thickness are not directly related to the point where parallel rays of light converge or appear to diverge.
3. Which macromolecule serves as the repository of genetic information in all living organisms?
- A. Ribonucleic acid (RNA)
- B. Deoxyribonucleic acid (DNA)
- C. Protein
- D. Carbohydrate
Correct answer: B
Rationale: Rationale: - DNA is the macromolecule that serves as the repository of genetic information in all living organisms. It carries the genetic instructions necessary for the growth, development, functioning, and reproduction of organisms. - RNA (option A) is involved in various cellular processes, including protein synthesis, but DNA is the primary molecule responsible for storing genetic information. - Proteins (option C) are essential for various cellular functions but do not serve as the primary repository of genetic information. - Carbohydrates (option D) are important for energy storage and structural support but do not store genetic information.
4. A pressure vessel has a cylindrical body (diameter 10cm, height 20cm) with hemispherical ends (same diameter as the cylinder). What is its total surface area?
- A. 785 sq cm
- B. 1130 sq cm
- C. 1570 sq cm
- D. 2055 sq cm
Correct answer: D
Rationale: Calculate the surface area of the cylinder (base + lateral surface) and two hemispheres. Add them all up for the total surface area.
5. What is the involuntary process of emptying the bladder called?
- A. Filtration
- B. Micturition
- C. Reabsorption
- D. Excretion
Correct answer: B
Rationale: The correct answer is B: 'Micturition.' Micturition, also known as urination, is the involuntary process of emptying the bladder. During micturition, the bladder contracts while the sphincter muscles relax, allowing urine to be expelled from the body. Filtration (A) is the process of separating substances based on their size as they pass through a filter. Reabsorption (C) refers to the process of reclaiming substances from the filtrate in the renal tubules back into the bloodstream. Excretion (D) is the process of eliminating waste products from the body through urine, feces, sweat, or other means. Therefore, micturition is the specific term that describes the act of emptying the bladder involuntarily.
6. Balance the following redox reaction in acidic solution: Iâ» (aq) + Crâ‚‚O₇²â» (aq) -> Iâ‚‚ (aq) + Cr³âº (aq). Identify the oxidizing agent and reducing agent.
- A. Iâ» is oxidized, Crâ‚‚O₇²â» is reduced
- B. Iâ» is reduced, Crâ‚‚O₇²â» is oxidized.
- C. Both Iâ» and Crâ‚‚O₇²â» are oxidized.
- D. Both Iâ» and Crâ‚‚O₇²â» are reduced.
Correct answer: A
Rationale: . Iâ» loses an electron (oxidation), Crâ‚‚O₇²â» gains electrons (reduction).
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