1
MHT CET (PCB) 2024 22th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

For which of the following combinations of working temperatures, the efficiency of Carnot's engine is maximum?

A
40 K and 20 K
B
50 K and 30 K
C
70 K and 50 K
D
90 K and 60 K
2
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two stars 'A' and 'B' radiate maximum energy at $5200 \mathop {\rm{A}}\limits^ \circ$ and $6500 \mathop {\rm{A}}\limits^ \circ$ respectively. Then the ratio of absolute temperatures of stars ' A ' and ' $B$ ' is $$\mathop {\rm{A}}\limits^ \circ $$
A
$25: 16$
B
$5: 4$
C
$4: 5$
D
$16: 25$
3
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

A spherical body of radius ' $r$ ' radiates power ' $P$ ' at $T$ kelvin. If the radius $s$ halved and the temperature doubled the power radiated in the same time ' t ' will be

A
$\frac{\mathrm{P}}{2}$
B
2 P
C
4 P
D
8 P
4
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

In thermodynamic process, which of the following statements is not true?

A
In an adiabatic process, the system is insulated from the surroundings.
B
In an isochoric process, the pressure remains constant.
C
In an isothermal process, the temperature remains constant.
D
In an adiabatic process, $\mathrm{pv}^\gamma=$ constant.
MHT CET (Biology) Subjects
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