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
Which scientist is credited with the observational discovery that the universe is expanding?
Answer:
Edwin Hubble
In 1929, Edwin Hubble analyzed the redshift of distant galaxies and observed that they are moving away from Earth at speeds proportional to their distance. This landmark observation provided the empirical evidence for the expansion of the universe, fundamentally changing modern cosmology.
2
The scientific theory regarding the expansion of the universe is primarily supported by which phenomenon?
Answer:
Doppler effect
The expansion of the universe is evidenced by the redshift of light from distant galaxies. This redshift is a manifestation of the Doppler effect, where the light waves are stretched as the source moves away from the observer, indicating that galaxies are receding from us.