RRB JE 2015 Question Paper (30-Aug-2015) Shift 3

Question 1

A closed system receives $60 	ext{ KJ}$ heat but its internal energy decreases by $30 	ext{ KJ}$. Then the work done by the system is

Accepted Answer

$90 	ext{ KJ}$

Answer

$30 	ext{ KJ}$

Answer

$-30 	ext{ KJ}$

Answer

$-90 	ext{ KJ}$

Question 2

At critical point, the enthalpy of vaporization is

Accepted Answer

Zero

Answer

Dependent on temperature only

Answer

Maximum

Answer

Minimum

Question 3

Which thermodynamics law predicts correctly, the degree of completion of chemical reaction?

Accepted Answer

Second law

Answer

Zeroth law

Answer

First law

Answer

Third law

Question 4

Intensity of radiation at a surface in perpendicular direction is equal to

Accepted Answer

Product of emissivity of surface and $1/I$

Answer

Product of emissivity of surface and $I$

Answer

Product of emissive power of surface and $1/\Lambda$

Answer

Product of emissive power of surface and $I\Lambda$

Question 5

If the temperature of a soild surface changes from $27^\circ C$ to $627^\circ C$, then its emissive power changes in which ratio?

Accepted Answer

81:1

Answer

6:1

Answer

9:1

Answer

27:1