ATI TEAS 7
Chemistry
1. The pH scale is used to indicate the concentration of:
- A. Oxygen
- B. Hydrogen ions
- C. Salts
- D. Sugar molecules
Correct answer: A
Rationale: The pH scale measures the concentration of hydrogen ions in a solution, indicating acidity or basicity.
2. Identify the interjection in the following sentence: Ouch! I stubbed my toe on the table leg.
- A. table
- B. leg
- C. ouch
- D. stubbed
Correct answer: C
Rationale: Interjections express emotions or sudden feelings. "Ouch" conveys a feeling of pain.
3. What property of a wave determines its speed in a given medium?
- A. Amplitude
- B. Wavelength
- C. Frequency
- D. Medium's properties
Correct answer: d
Rationale: The speed of a wave is determined by the properties of the medium it travels through.
4. An Egyptian model pyramid has a square base side length of 10cm and a height of 8cm. What is its volume?
- A. 20 cu cm
- B. 40 cu cm
- C. 80 cu cm
- D. 160 cu cm
Correct answer: D
Rationale: Use the formula for volume of a pyramid: (1/3) * base area * height. Calculate the base area (10cm * 10cm = 100 sq cm) and substitute: (1/3) * 100 sq cm * 8cm = 80 cu cm.
5. According to the wave theory of light, the bright fringes observed in a double-slit experiment correspond to:
- A. Constructive interference
- B. Destructive interference
- C. Increased diffraction
- D. Total internal reflection
Correct answer: A
Rationale: The correct answer is A: Constructive interference. According to the wave theory of light, when two light waves meet in phase (crest to crest or trough to trough), they combine to produce a brighter fringe. This is known as constructive interference, leading to the formation of bright fringes in a double-slit experiment. Destructive interference, on the other hand, occurs when two waves are out of phase (crest to trough), resulting in a dimmer or dark fringe. Increased diffraction refers to the bending of light waves around obstacles, not the formation of bright fringes. Total internal reflection is a phenomenon that occurs at the boundary between two different mediums when light is reflected back into the original medium. Therefore, the bright fringes observed in a double-slit experiment correspond to constructive interference.
6. What is the difference between alpha decay and beta decay?
- A. Both release the same type of particle.
- B. Alpha decay releases a helium nucleus, while beta decay releases an electron or positron.
- C. Alpha decay is more common than beta decay.
- D. They both convert one element into another, but in different ways.
Correct answer: B
Rationale: Alpha decay releases a helium nucleus (2 protons, 2 neutrons), while beta decay releases an electron or positron. - Both processes alter the atomic structure and change the element's identity.
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