Physics MCQs
Topic Notes: Physics
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
How many electron shells (orbits) are occupied in the atoms of germanium, arsenic, selenium, and bromine?
Answer:
4
Germanium (atomic number 32), Arsenic (33), Selenium (34), and Bromine (35) all belong to the fourth period of the periodic table. Elements in the fourth period have their valence electrons in the fourth principal energy level, meaning they possess four occupied electron shells.
2
In which region of the electromagnetic spectrum do transition metal ions typically absorb light?
Answer:
Visible region
Transition metal ions possess partially filled d-orbitals. When these ions are in a ligand field, the d-orbitals split into different energy levels. The energy difference between these levels often corresponds to the energy of photons in the visible light spectrum. Consequently, electronic transitions between these levels result in the absorption of specific wavelengths of visible light, giving the compounds their characteristic colors.