UP Board Solution Class 11 Physics. We covered all the UP Board Solution Class 11 Physics in this post for free so that you can practice well for the exam.
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Class 11 Physics MCQs for Students
Radiation emitted by a surface is directly proportional to
(A) the Third power of its absolute temperature
(B) Equal to its absolute temperature
(C) Twice the power of its absolute temperature
(D) the Fourth power of its absolute temperature
Option d – the Fourth power of its absolute temperature
If the temperature of a perfectly black body increased two times, then the rate of radiation of a perfectly black body increases by :
(A) Two times
(B) Four times
(C) Eight times
(D) Sixteen times
Option d – Sixteen times
The rate of emission of radiant energy per unit area of a body per unit of time is proportional to the fourth power of its absolute temperature. This law is known as
(A) Lein’s law
(B) Wein’s displacement law
(C) Stefan’s law
(D) Newton’s law of cooling
Option c – Stefan’s law
Which of the following statement is WRONG?:
(A) Stefan’s constant is the same for all black bodies.
(B) Thermal radiations travel with the speed of 3 × 108 m/s
(C) Thermal radiations exhibit diffraction
(D) Stefan’s law is applicable to all heated bodies
Option d – Stefan’s law is applicable to all heated bodies
A metal cube of each side 0.05 m long emits 0.6 kcal in 80 seconds. Then the emissive power of its surface in kcal/s m² 2 is :
(A) 0.5
(B) 0.05
(C) 5
(D) 5 x 10²
Option a – 0.5
The emissive power of a sphere of area of 0.02 m² is 0.5 kcal/sm². What is the amount of heat radiated by the spherical surface in 20 seconds?:
(A) 0.2 kcal
(B) 2 kcal
(C) 0.02 kcal
(D) 0.002 kcal
Option a – 0.2 kcal
We covered all the up board solution class 11 physics above in this post for free so that you can practice well for the exam.
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