AIPMT 2012 Prelims | Properties of Matter Question 61 | Physics

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

Liquid oxygen at 50 K is heated to 300 K at constant pressure of 1 atm. The rate of heating is constant. Which one of the following graphs represents the variation of temperature with time ?

AIPMT 2012 Prelims Physics - Properties of Matter Question 48 English Option 1

AIPMT 2012 Prelims Physics - Properties of Matter Question 48 English Option 2

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

If the radius of a star is R and it acts as a black body, what would be the temperature of the star, in which the rate of energy production is Q?

$${Q \over {4\pi {R^2}\sigma }}$$

$${\left( {{Q \over {4\pi {R^2}\sigma }}} \right)^{ - 1/2}}$$

$${\left( {{{4\pi {R^2}Q} \over \sigma }} \right)^{1/4}}$$

$${\left( {{Q \over {4\pi {R^2}\sigma }}} \right)^{1/4}}$$

AIPMT 2010 Prelims

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 2010 Prelims

MCQ (Single Correct Answer)

-1

The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature TK is given by

$${{\sigma {r^2}{T^4}} \over {{R^2}}}$$

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

$${{\sigma {r^2}{T^4}} \over {{R^4}}}$$

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

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