## Radiation - 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 Radiation. 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. Heat travels through vacuum by

•  Conduction
•  Convention
•  Both (a) and (b)

Q2. For a perfectly black body, its absorptive power is

•  1
•  0.5
•  0
•  Infinity

Q3. Which of the following is the example of ideal black body

•  Kajal
•  Black board
•  A pin hole in a box
•  None of these

Q4. Which of the following is the best example of an ideal black body

•  Lamp black
•  Platinum black
•  Highly heated charcoal lamp
•  Cavity maintained at constant temperature

Q5. The spectrum from a black body radiation is a

•  Line spectrum
•  Band spectrum
•  Continuous spectrum
•  Line and band spectrum both

Q6. In summer one feels cold on entering an air conditioned room. This can be explained by

•  Newton's law of cooling
•  Stefan's law
•  Kirchoff's law
•  Prevost's theory of heat exchange

Q7. Out of the radiations falling on surface of a body, 30% radiations are absorbed and 30% are transmitted then its reflection coefficient will be

•  0.3
•  0.6
•  0.4
•  Zero

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