1
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
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 ?
A
AIPMT 2012 Prelims Physics - Properties of Matter Question 48 English Option 1
B
AIPMT 2012 Prelims Physics - Properties of Matter Question 48 English Option 2
C
AIPMT 2012 Prelims Physics - Properties of Matter Question 48 English Option 3
D
AIPMT 2012 Prelims Physics - Properties of Matter Question 48 English Option 4
2
AIPMT 2012 Prelims
MCQ (Single Correct Answer)
+4
-1
Change Language
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?
A
$${Q \over {4\pi {R^2}\sigma }}$$
B
$${\left( {{Q \over {4\pi {R^2}\sigma }}} \right)^{ - 1/2}}$$
C
$${\left( {{{4\pi {R^2}Q} \over \sigma }} \right)^{1/4}}$$
D
$${\left( {{Q \over {4\pi {R^2}\sigma }}} \right)^{1/4}}$$
3
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-1
Assuming the sun to have a spherical outer surface of radius r, radiating like a black body at temperature toC, 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.
A
$${{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {4\pi {R^2}}}$$
B
$${{16{\pi ^2}{r^2}\sigma {t^4}} \over {{R^2}}}$$
C
$${{{r^2}\sigma {{\left( {t + 273} \right)}^4}} \over {{R^2}}}$$
D
$${{4\pi {r^2}\sigma {t^4}} \over {{R^2}}}$$
4
AIPMT 2010 Prelims
MCQ (Single Correct Answer)
+4
-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
A
$${{\sigma {r^2}{T^4}} \over {{R^2}}}$$
B
$${{\sigma {r^2}{T^4}} \over {4\pi {R^2}}}$$
C
$${{\sigma {r^2}{T^4}} \over {{R^4}}}$$
D
$${{4\pi \sigma {r^2}{T^4}} \over {{R^2}}}$$
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