The efficiency of a machine is 80%. If it lifts a load of 500 N through 2 m, effort applied through 10 m. Effort is MCQ with Answer and Explanation
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Question #1
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Sound resonance used in:
Correct Answer: Option A
Explanation:
Resonance amplifies sound at natural frequency: instruments (guitar body), tuning forks (frequency standard). Memory tip: 'Resonance: musical instruments (amplify), tuning forks (calibration), avoid in bridges'. Wave application frequently tested in competitive exams.
Resonance amplifies sound at natural frequency: instruments (guitar body), tuning forks (frequency standard). Memory tip: 'Resonance: musical instruments (amplify), tuning forks (calibration), avoid in bridges'. Wave application frequently tested in competitive exams.
Question #2
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The purpose of choke in a fluorescent lamp is to
Question #3
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The slope of a displacement-time graph for uniform motion is
Correct Answer: Option D
Explanation:
Displacement-time graph slope = Δx/Δt = average velocity. For uniform motion, velocity constant, graph is a straight line, slope equals velocity. Acceleration would be slope of velocity-time graph. Thus, slope represents velocity. Exam trick: slope of x-t graph gives instantaneous velocity.
Displacement-time graph slope = Δx/Δt = average velocity. For uniform motion, velocity constant, graph is a straight line, slope equals velocity. Acceleration would be slope of velocity-time graph. Thus, slope represents velocity. Exam trick: slope of x-t graph gives instantaneous velocity.
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