1
NEET 2013
MCQ (Single Correct Answer)
+4
-1
A body of mass 'm' is taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be
A
3mgR
B
$${1 \over 3}$$mgR
C
mg2R
D
$${2 \over 3}$$ mgR
2
NEET 2013
MCQ (Single Correct Answer)
+4
-1
Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1 m, 2 m, 4 m, 8 m, . . . , respectively, from the origin. The resulting gravitational potential due to this system at the origin will be
A
$$ - {4 \over 3}$$ G
B
$$-$$ 4G
C
$$-$$ G
D
$$ - {8 \over 3}$$ G
3
NEET 2013
MCQ (Single Correct Answer)
+4
-1
A piece of iron is heated in a flame. It first becomes dull red then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using
A
Kirchhoff's Law
B
Newton's Law of cooling
C
Stefan's Law
D
Wien's displacement Law
4
NEET 2013
MCQ (Single Correct Answer)
+4
-1
The molar specific heats of an ideal gas at constant pressure and volume are denoted by Cp and Cv, respectively. If  $$\gamma $$ = $${{{C_p}} \over {{C_v}}}$$ and R is the universal gas constant, then Cv is equal to
A
$${{\left( {\gamma - 1} \right)} \over R}$$
B
$$\gamma R$$
C
$${{1 + \gamma } \over {1 - \gamma }}$$
D
$${R \over {\left( {\gamma - 1} \right)}}$$
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