1
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
A wheel has angular acceleration of 3.0 rad/sec2 and an initial angular speed of 2.00 rad/sec. In a time of 2 sec it has rotated through an angle (in radian) of
A
10
B
12
C
4
D
6
2
AIPMT 2007
MCQ (Single Correct Answer)
+4
-1
Two satellites of earth, S1 and S2 are moving in the same orbit. The mass of S1 is four times the mass of S2. Which one of the following statements is true ?
A
The potential energies of earth and satellite in the two cases are equal.
B
S1 and S2 are moving with the same speed.
C
The kinetic energies of the two satellites are equal.
D
The time period of S1 is four times that of S2.
3
AIPMT 2007
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 2007
MCQ (Single Correct Answer)
+4
-1
A black body is at 727oC. It emits energy at a rate which is proportional to
A
(1000)4
B
(1000)2
C
(727)4
D
(727)2
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