An echo is heard after 2 seconds from a cliff. If speed of sound is 340 m/s, distance of cliff is MCQ with Answer and Explanation
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Question #1
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An object is placed between pole and focus of a concave mirror. The image is
Question #2
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The fundamental principle utilized in an optical endoscope, which allows doctors to examine the inside of the human body, is:
Correct Answer: Option C
Explanation:
Endoscopes consist of bundles of flexible optical fibers. Light introduced at one end is trapped inside the fiber core because it repeatedly strikes the boundary at an angle greater than the critical angle. This Total Internal Reflection allows light and visual images to be transmitted through complex, curving paths inside the body.
Endoscopes consist of bundles of flexible optical fibers. Light introduced at one end is trapped inside the fiber core because it repeatedly strikes the boundary at an angle greater than the critical angle. This Total Internal Reflection allows light and visual images to be transmitted through complex, curving paths inside the body.
Question #3
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The boiling point of water at high altitude is lower because
Correct Answer: Option C
Explanation:
Boiling occurs when vapour pressure equals atmospheric pressure. At high altitude, atmospheric pressure is lower, so water boils at lower temperature. Pressure cooker increases pressure to raise boiling point for faster cooking.
Boiling occurs when vapour pressure equals atmospheric pressure. At high altitude, atmospheric pressure is lower, so water boils at lower temperature. Pressure cooker increases pressure to raise boiling point for faster cooking.
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