12th Physics One Mark Online Test. We covered all the 12th Physics One Mark Online Test in this post for free so that you can practice well for the exam.
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12th Physics Practice MCQs for Students
What will be the ratio of temperatures of the sun and moon if the wavelengths of their maximum emission radiations are 140 A and 4200 Aº respectively?
(A) 1:30
(B) 30 : 1
(C) 42:14
(D) 14:42
Option b – 30 : 1
A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using :
(A) Wien’s displacement Law
(B) Kirchoff’s Law
(C) Newton’s Law of Cooling
(D) Stefan’s Law
Option a – Wien’s displacement Law
The maximum wavelength of radiation emitted at 2000 K is 4 um. What will be the maximum wavelength of radiation emitted at 2400 K?
(A) 3.33 µm
(B) 0.66 μm
(C) 1 μm
(D) 1 m
Option a – 3.33 µm
The temperatures of the two bodies A and B are respectively 727°C and 327°C. The ratio HA : HB of the rates of heat radiated by them is :
(A) 727 : 327
(B) 5 : 3
(C) 25 : 9
(D) 625 : 81
Option d – 625 : 81
If the temperature of the black body is raised by 5% then the heat energy radiated would increase by :
(A) 5%
(B) 21.55%
(C) 41.65%
(D) 625%
Option b – 21.55%
The SI unit of Wien’s constant is :
(A) m/K
(B) cm/K
(C) mK
(D) m²K
Option c – mK
The maximum radiations from the two bodies correspond to 560 nm and 420 nm respectively. The ratio of their temperature is :
(A) 4 : 3
(B) 3 : 4
(C) 2 : 1
(D) 3 : 2
Option b – 3 : 4
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