11th Physics Sample Paper. We covered all the 11th Physics Sample Paper in this post for free so that you can practice well for the exam.
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11th Physics Mock Test for Students
The temperature of the black body becomes half of its original temperature. The amount of radiation emitted by the body will reduce to
(A) 1/2
(B) 1/16
(C) 1/4
(D) 1/8
Option b – 1/16
A body at 227 °C radiates heat at the rate of 5 cal/s cm². The rate of heat radiated in cal/s cm² at 727 °C is :
(A) 40
(B) 80
(C) 160
(D) 240
Option b – 80
The ratio of the rate of radiation of heat of the body at 227 °C to that of the same body at 27 °C is :
(A) 25 : 9
(B) 125 : 27
(C) 5 : 3
(D) 625 : 81
Option d – 625 : 81
The ratio of the rate of emission of heat by a perfectly black body at 427 °C and at 127 °C is :
(A) 7 : 4
(B) 343 : 64
(C) 49:16
(D) 2401 : 256
Option d – 2401 : 256
Two spherical bodies of the same material having radii in the ratio 2 : 1, therefore the rate of radiation of heat by them at a given temperature is in the ratio of :
(A) 1 : 2
(B) 2 : 1
(C) 4 : 1
(D) 1 : 4
Option c – 4 : 1
The rate of radiation from a black body at 0 °C is E J/s. Then the rate of radiation from this black body at 273 °C will be :
(A) 16 E
(B) 8 E
(C) 4 E
(D) E
Option a – 16 E
An electric heater, assumed to be a black body, has a temperature of 727 °C. If its temperature is raised to 1727 °C, the amount of energy radiated per unit of time now as compared with that in the first case will be :
(A) 2 times
(B) 4 times
(C) 16 times
(D) 100 times
Option c – 16 times
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