The process of heat transfer in a solid metal rod is MCQ with Answer and Explanation
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Question #1
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A car decelerates uniformly from 20 m/s to rest in 4 s. Distance covered is
Question #2
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Diffraction limits resolution because:
Correct Answer: Option D
Explanation:
Diffraction spreads light through apertures, creating Airy patterns instead of points. Fundamental limit: θ_min ≈ 1.22λ/D (Rayleigh criterion). Memory tip: 'Diffraction limit: smaller λ or larger aperture ⇒ better resolution'. Wave optics concept frequently tested in competitive exams.
Diffraction spreads light through apertures, creating Airy patterns instead of points. Fundamental limit: θ_min ≈ 1.22λ/D (Rayleigh criterion). Memory tip: 'Diffraction limit: smaller λ or larger aperture ⇒ better resolution'. Wave optics concept frequently tested in competitive exams.
Question #3
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SONAR is based on the principle of:
Correct Answer: Option A
Explanation:
SONAR (Sound Navigation and Ranging) relies on the reflection of ultrasonic waves. A transmitter sends out sound waves, which travel through water, strike an object (like a submarine or the seabed), and reflect back as an echo to a receiver. By measuring the time taken for the echo to return, the distance can be calculated.
SONAR (Sound Navigation and Ranging) relies on the reflection of ultrasonic waves. A transmitter sends out sound waves, which travel through water, strike an object (like a submarine or the seabed), and reflect back as an echo to a receiver. By measuring the time taken for the echo to return, the distance can be calculated.
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