1
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
Two mercury drops, each with same radius $r$ merged to form a bigger drop. $T$ is the surface tension of single drop, then the surface energy of bigger drop is given by
A
$2 \pi r^2 T$
B
$2^{\frac{5}{3}} \pi r^2 T$
C
$2 \pi r^2 T^2$
D
$2^{\frac{8}{3}} \pi r^2 T$
2
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
The absorption coefficient value of a perfect black body is
A
zero
B
$<1$
C
$>1$
D
1
3
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
A certain volume of a gas at 300 K expands adiabatically until its volume is doubled. The resultant fall in temperature of the gas is nearly (The ratio of the specific heats of the gas $=1.5$ )
A
88 K
B
77 K
C
67 K
D
54 K
4
AP EAPCET 2024 - 20th May Evening Shift
MCQ (Single Correct Answer)
+1
-0
The efficiency of a Carnot's engine is $25 \%$. When the temperature of sink is 300 K . The increase in the temperature of source required for the efficiency to become $50 \%$ is
A
225 K
B
400 K
C
200 K
D
100 K
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