| List I (electronic device) | List-II(Use/application) | ||
|---|---|---|---|
| A | Photodiode | I | Remote controls |
| B | Zener diode | II. | Amplifier |
| C | Light emitting diode | III | Voltage regulator |
| D | Transistor | IV | Photodetector |
The magnitude of heat exchanged by a system for the given cyclic process ABC (as shown in the figure) is (in SI units):

As shown below, bob A of a pendulum having massless string of length \( R \) is released from \( 60^\circ \) to the vertical. It hits another bob B of half the mass that is at rest on a frictionless table in the center. Assuming elastic collision, the magnitude of the velocity of bob A after the collision will be (take \( g \) as acceleration due to gravity):

