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
What term describes an optical instrument's capacity to differentiate between two closely positioned objects or point sources?
Answer:
resolving power
Resolving power is defined as the ability of an optical instrument, such as a telescope or microscope, to produce distinct images of two objects that are very close together. It is limited by diffraction effects, which cause light from point sources to spread out into Airy disks, eventually overlapping if the sources are too close.
2
What term describes the capability of an optical instrument to distinguish between two closely positioned objects?
Answer:
Resolving power
Resolving power is defined as the ability of an optical system, such as a telescope or microscope, to produce distinct images of two objects that are very close together. It is fundamentally limited by the diffraction of light waves, which causes images to blur into Airy disks. As the distance between objects decreases, their diffraction patterns overlap, eventually making them indistinguishable.
3
Which of the following statements is scientifically inaccurate?
Answer:
The wavelength of gamma rays is longer than that of X-rays
Gamma rays have the highest energy and the shortest wavelengths in the electromagnetic spectrum, significantly shorter than those of X-rays. Therefore, the claim that gamma rays have a longer wavelength than X-rays is incorrect.