A radioactive nucleus emits a beta particle. Its atomic number MCQ with Answer and Explanation
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Question #1
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Which appliance works on the principle of electromagnetic induction?
Question #2
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Mirage is an optical illusion observed in hot deserts. It is entirely caused by:
Correct Answer: Option B
Explanation:
In hot deserts, the sand heats the air immediately above it, making it less dense (optically rarer) than cooler air higher up. Light from a tall object (like the sky or a tree) traveling downwards passes from denser to rarer air layers, bending away from the normal. Eventually, the angle of incidence exceeds the critical angle, causing total internal reflection. The observer perceives this reflected light as a pool of water on the ground.
In hot deserts, the sand heats the air immediately above it, making it less dense (optically rarer) than cooler air higher up. Light from a tall object (like the sky or a tree) traveling downwards passes from denser to rarer air layers, bending away from the normal. Eventually, the angle of incidence exceeds the critical angle, causing total internal reflection. The observer perceives this reflected light as a pool of water on the ground.
Question #3
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The device used to measure electric potential difference is
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