1
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A compound slab is made of two parallel plates of copper and brass of the same thickness and having thermal conductivities in the ratio 4 : 1. The free face of copper is at 0$$^\circ$$C. The temperature of the interface is 20$$^\circ$$C. What is the temperature of the free face of brass?

A
0$$^\circ$$C
B
20$$^\circ$$C
C
40$$^\circ$$C
D
100$$^\circ$$C
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

In mm$$^3$$ of a gas is compressed at 1 atmospheric pressure and temperature 27$$^\circ$$C to 627$$^\circ$$C. What is the final pressure under adiabatic condition?

($$\gamma$$ for the gas = 1.5)

A
$$27\times10^5$$ N/m$$^2$$
B
$$80\times10^5$$ N/m$$^2$$
C
$$36\times10^5$$ N/m$$^2$$
D
$$56\times10^5$$ N/m$$^2$$
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

If sink is at a temperature of $$-39\Upsilon$$C and source at 0$$^\circ$$C, then efficiency will be

A
39.4%
B
14.2%
C
35.2%
D
45.5%
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

Which of the following laws of Physics is valid across all domains of nature?

A
Newton's law of motion
B
Conservation of momentum
C
Conservation of energy
D
All of the above
EXAM MAP