A typical Cathode Ray Oscilloscope (CRO) is fundamentally designed to visually display and analyze which physical quantity with respect to time? MCQ with Answer and Explanation
A typical Cathode Ray Oscilloscope (CRO) is fundamentally designed to visually display and analyze which physical quantity with respect to time?
A. Voltage
B. Magnetic Field
C. Temperature
D. Pressure
Answer: Option A
Solution (By JKExamLibrary)
A CRO uses an electron beam sweeping across a phosphorescent screen to create a visible graph. It is fundamentally a voltage-measuring instrument. The vertical deflection is directly proportional to the applied voltage, and the horizontal deflection is controlled by a time-base generator, allowing it to display voltage waveforms over time.
Explanation:
Newton's law: F = Gm₁m₂/r² ⇒ F ∝ 1/r². Inverse square law fundamental to gravitation, electrostatics, and radiation intensity. Memory aid: 'Gravity weakens with square of distance; double distance ⇒ force becomes 1/4'. Core concept frequently tested to verify understanding of fundamental force laws in competitive exams.
Explanation:
Parallel-faced slab: refraction at entry and exit cancel angular deviation, but ray shifts laterally. No net direction change. Memory tip: 'Slab: parallel emergent ray; Prism: deviated emergent ray'. Ray optics concept frequently tested in competitive exams.
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