The image formed on the retina of human eye is MCQ with Answer and Explanation
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Question #1
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The defect of vision in which a person cannot see nearby objects clearly is
Question #2
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Beats used for:
Correct Answer: Option C
Explanation:
Beats: tune instruments (zero beat = matched frequency); measure sound speed via known frequency difference. Memory tip: 'Beats: tuning and measurement applications'. Wave phenomenon application frequently tested in competitive exams.
Beats: tune instruments (zero beat = matched frequency); measure sound speed via known frequency difference. Memory tip: 'Beats: tuning and measurement applications'. Wave phenomenon application frequently tested in competitive exams.
Question #3
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A body weighs 72 N on the surface of the Earth. What is the gravitational force on it at a height equal to half the radius of the Earth?
Correct Answer: Option D
Explanation:
Weight on surface W = mg = 72 N. Acceleration due to gravity at height h is g' = g [R / (R+h)]². Here h = R/2. So, g' = g [R / (R + R/2)]² = g [1 / (3/2)]² = g (2/3)² = 4g/9. The new weight W' = mg' = m(4g/9) = (4/9)mg = (4/9) × 72 = 32 N.
Weight on surface W = mg = 72 N. Acceleration due to gravity at height h is g' = g [R / (R+h)]². Here h = R/2. So, g' = g [R / (R + R/2)]² = g [1 / (3/2)]² = g (2/3)² = 4g/9. The new weight W' = mg' = m(4g/9) = (4/9)mg = (4/9) × 72 = 32 N.
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