## Kirchoff's Law - MCQ - Basic Level

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of Basic Level Questions on Kirchoff's Law. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. There is a black spot on a body. If the body is heated and carried in dark room then it glows more. This can be explained on the basis of

•  Newton's law of cooling
•  Wien's law
•  Kirchoff's law
•  Stefan's

Q2. If between wavelength Î» + dÎ», eÎ» and aÎ» be the emissive and absorptive powers of a body and EÎ» be the emissive power of a perfectly black body, then according to Kirchoff's law, which is true

•  eÎ» = aÎ» = EÎ»
•  eÎ»EÎ» = aÎ»
•  eÎ» = aÎ»EÎ»
•  eÎ»aÎ»EÎ» = constant

Q3. During total solar eclipse Fraunhoffer's lines appear bright because

•  Moon totally covers both parts of sun photo sphere and chromosphere
•  Sun light is scattered by moon
•  Moon blocks the radiations emitted by chromosphere
•  Moon blocks the radiations emitted by photosphere and radiations emitted by chromosphere reach the earth

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