12th Physics One Mark Online Test. We covered all the 12th physics book back 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
We covered all the 12th physics one mark online test above in this post for free so that you can practice well for the exam.
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Also, check out:
- Class 12 Physics Important Question UP Board
- Class 12 Physics Objective Question Answer in Hindi
- Pradeep Physics Class 12 Volume 2
