11. A car moving at a speed of 28 m/s blows a horn of the frequency 500 Hz and overtakes a car moving in the same direction with a speed of 13 m/s. The apparent frequency heard by the observer of other car will be (after overtaking): (sound speed-342 m/sec) 1. 480 Hz 2. 500 Hz 3. 520 Hz 4. 580 Hz 12. The angle of prism is 6 and refractive index for green light is 1.5. If a green ray passes from it the deviation will be (1) 30 (2) 15 (3) 9 (4) 3 13. Two small balls having equal positive charge Q on each are suspended by two insulating strings of equal length L meter, from a hook fixed to a stand. The whole set up is taken in a satellite into space where there is no gravity. Then the angle 0 between two strings and tension in each string is In the circuit shown in the figure, the potential difference across the 4.0 uF capacitor is 2F 4.0uF 12V 1. volts 2.4 volts 3. 6 volts 4. 8 volts