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Unit 1 - Periodic Motion and Wave Mechanics

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Lesson 1: Oscillatory Motion and Wave Mechanics — Lesson quiz

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  • Questions count: 5
  • Passing grade: 60%
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1.
If a vibrating body executes 120 oscillations in 2 seconds, its frequency and periodic time are:
30 Hz and 0.033 s
60 Hz and 60 s
60 Hz and 0.0167 s
120 Hz and 0.5 s
2.
Which of the following cellular changes occurs directly when a wilted plant shoot is irrigated with fresh water?
Cell sap osmotic pressure increases and cell wall shrinks inward.
Lignin is immediately deposited inside the xylem vessel walls.
Water enters the vacuole via osmosis, expanding turgor pressure against the cell wall.
Cuticle thickness over leaf epidermis doubles within minutes.
3.
During maximal skeletal muscle contraction according to Huxley's sliding filament model, which region experiences NO change in its absolute length?
The I-band (light isotropic zone)
The A-band (dark anisotropic zone)
The distance between two successive Z-lines
The H-zone (central semi-light region)
4.
What is the biochemical cause of continuous, non-relaxing muscle spasm that can cause muscular tearing?
Excessive breakdown of acetylcholine by the enzyme acetylcholinesterase.
Sudden accumulation of glucose inside glycogen granules.
Complete depletion of cellular ATP molecules, preventing cross-bridge detachment.
Abrupt accumulation of excessive calcium ions in the synaptic cleft.
5.
How many cervical vertebrae are present in the adult human vertebral column?
7 vertebrae
4 vertebrae
5 vertebrae
12 vertebrae
  • 1
  • 2
  • 3
  • 4
  • 5