1
IIT-JEE 2011 Paper 1 Offline
+3
-0.75
A police car with a siren of frequency 8 kHz is moving with uniform velocity 36 km/hr towards a tall building which reflects the sound waves. The speed of sound in air is 320 m/s. The frequency of the siren heard by the car driver is
A
8.50 kHz
B
8.25 kHz
C
7.75 kHz
D
7.50 kHz
2
IIT-JEE 2011 Paper 1 Offline
+2
-0.5
Consider an electric field $$\overrightarrow E = {E_0}\widehat x$$ where $${E_0}$$ is a constant. The flux through the shaded area (as shown in the figure) due to this field is
A
$$2{E_0}{a_2}$$
B
$$\sqrt 2 {E_0}{a^2}$$
C
$${E_0}\,{a^2}$$
D
$${{{E_0}{a^2}} \over {\sqrt 2 }}$$
3
IIT-JEE 2011 Paper 1 Offline
+2
-0.5
A $$2$$ $$\mu F$$ capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch $$S$$ is turned to position $$2$$ is
A
$$0\%$$
B
$$20\%$$
C
$$75\%$$
D
$$80\%$$
4
IIT-JEE 2011 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-1
A spherical metal shell A of radius $${R_A}$$ and a solid metal sphere $$B$$ of radius $${R_B}\left( { < {R_A}} \right)$$ are kept far apart and each is given charge $$' + Q'.$$ Now they are connected by a thin metal wire. Then
A
$$E_A^{inside} = 0$$
B
$${Q_A} > {Q_B}$$
C
$${{{\sigma _A}} \over {{\sigma _B}}} = {{{R_B}} \over {{R_A}}}$$
D
$$E_A^{on\,\,surface} < \,E_B^{on\,\,surface}$$
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