AIPMT 2007 | Properties of Matter Question 71 | Physics

AIPMT 2007

MCQ (Single Correct Answer)

-1

Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature t^oC, the power received by a unit surface, (normal to the incident rays) at a distance R from the centre of the sun is
where $$\sigma $$ is the Stefan's constant.

$${{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {4\pi {R^2}}}$$

$${{16{\pi ^2}{r^2}\sigma {t^4}} \over {{R^2}}}$$

$${{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {{R^2}}}$$

$${{4\pi {r^2}\sigma {t^4}} \over {{R^2}}}$$

AIPMT 2007

MCQ (Single Correct Answer)

-1

A black body is at 727^oC. It emits energy at a rate which is proportional to

(1000)⁴

(1000)²

(727)⁴

(727)²

AIPMT 2006

MCQ (Single Correct Answer)

-1

A black body at 1227^oC emits radiations with maximum intensity at a wavelength of 5000 $$\mathop A\limits^ \circ $$. If the temperature of the body is increased by 1000^oC, the maximum intensity will be observed at

3000 $$\mathop A\limits^ \circ $$

4000$$\mathop A\limits^ \circ $$

5000$$\mathop A\limits^ \circ $$

6000$$\mathop A\limits^ \circ $$

AIPMT 2005

MCQ (Single Correct Answer)

-1

Which of the following rods, (given radius r and length $$l$$) each made of the same material and whose ends are maintained at the same temperature will conduct most heat ?

r = r₀, $$l$$ = $$l$$₀

r = 2r₀, $$l$$ = $$l$$₀

r = r₀, $$l$$ = 2$$l$$₀

r = 2r₀, $$l$$ = 2$$l$$₀

PREVIOUS NEXT

NEET Subjects

Browse all chapters by subject

Biology

Botany

Zoology

Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution