1
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
The pressure that has to be applied to the ends of a steel wire of length $$10$$ $$cm$$ to keep its length constant when its temperature is raised by $${100^ \circ }C$$ is: (For steel Young's modulus is $$2 \times {10^{11}}\,\,N{m^{ - 2}}$$ and coefficient of thermal expansion is $$1.1 \times {10^{ - 5}}\,{K^{ - 1}}$$ )
A
$$2.2 \times {10^8}\,\,Pa$$
B
$$2.2 \times {10^9}\,\,Pa$$
C
$$2.2 \times {10^7}\,\,Pa$$
D
$$2.2 \times {10^6}\,\,Pa$$
2
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
Three rods of Copper, Brass and Steel are welded together to form a $$Y$$ shaped structure. Area of cross - section of each rod $$ = 4c{m^2}.$$ End of copper rod is maintained at $${100^ \circ }C$$ where as ends of brass and steel are kept at $${0^ \circ }C$$. Lengths of the copper, brass and steel rods are $$46,$$ $$13$$ and $$12$$ $$cms$$ respectively. The rods are thermally insulated from surroundings excepts at ends. Thermal conductivities of copper, brass and steel are $$0.92, 0.26$$ and $$0.12$$ $$CGS$$ units respectively. Rate of heat flow through copper rod is:
A
$$1.2$$ $$cal/s$$
B
$$2.4$$ $$cal/s$$
C
$$4.8$$ $$cal/s$$
D
$$6.0$$ $$cal/s$$
3
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
One mole of a diatomic ideal gas undergoes a cyclic process $$ABC$$ as shown in figure. The process $$BC$$ is adiabatic. The temperatures at $$A, B$$ and $$C$$ are $$400$$ $$K$$, $$800$$ $$K$$ and $$600$$ $$K$$ respectively. Choose the correct statement : JEE Main 2014 (Offline) Physics - Heat and Thermodynamics Question 294 English
A
The change in internal energy in whole cyclic process is $$250$$ $$R.$$
B
The change in internal energy in the process $$CA$$ is $$700$$ $$R$$.
C
The change in internal energy in the process $$AB$$ is - $$350$$ $$R.$$
D
The change in internal energy in the process $$BC$$ is - $$500$$ $$R.$$
4
JEE Main 2014 (Offline)
MCQ (Single Correct Answer)
+4
-1
There is a circular tube in a vertical plane. Two liquids which do not mix and of densities $${d_1}$$ and $${d_2}$$ are filled in the tube. Each liquid subtends $${90^ \circ }$$ angle at center. Radius joining their interface makes an angle $$\alpha $$ with vertical. Radio $${{{d_1}} \over {{d_2}}}$$ is : JEE Main 2014 (Offline) Physics - Heat and Thermodynamics Question 292 English
A
$${{1 + \sin \,\alpha } \over {1 - \sin \,\alpha }}$$
B
$${{1 + \cos \,\alpha } \over {1 - \cos \,\alpha }}$$
C
$${{1 + \tan \,\alpha } \over {1 - \tan \,\alpha }}$$
D
$${{1 + \sin \,\alpha } \over {1 - \cos \,\alpha }}$$
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