1
IIT-JEE 2012 Paper 2 Offline
+3
-0.75
Two moles of ideal helium gas are in a rubber balloon at 30oC. The balloon is fully expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is slowly changed to 35oC. The amount of heat required in raising the temperature is nearly (take R = 8.31 J/mol.K)
A
62 J
B
104 J
C
124 J
D
208 J
2
IIT-JEE 2012 Paper 2 Offline
+3
-0.75
A student is performing the experiment of resonance Column. The diameter of the column tube is 4 cm. The frequency of the tuning fork is 512 Hz. The air temperature is 38oC in which the speed of sound is 336 m/s. The zero of the meter scale coincides with the top end of the Resonance Column tube. When the first resonance occurs, the reading of the water level in the column is
A
14.0 cm
B
15.2 cm
C
16.4 cm
D
17.6 cm
3
IIT-JEE 2012 Paper 2 Offline
+4
-1
In the given circuit, a charge of $$+80$$ $$\mu C$$ is given to the upper plate of the $$4$$ $$\mu F$$ capacitor. Then in the steady state, the charge on the upper plate of the $$3$$ $$\mu F$$ capacitor is A
$$+ \,32\,\mu C$$
B
$$+ \,40\,\mu C$$
C
$$+ \,48\,\mu C$$
D
$$+ \,80\,\mu C$$
4
IIT-JEE 2012 Paper 2 Offline
MCQ (More than One Correct Answer)
+4
-1
Six point charges are kept at the vertices of a regular hexagon of side $$L$$ and center $$O,$$ as shown in the figure. Given that $$K = {1 \over {4\pi {\varepsilon _0}}}{q \over {{L^2}}},$$ which of the following statement(s) is (are) correct ? A
The electric field at $$O$$ is $$6K$$ along $$OD$$
B
The potential at $$O$$ is zero
C
The potential at all points on the line $$PR$$ is same
D
The potential at all points on the line $$ST$$ is same
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