26. There is a diode connected to an external resistance and an e.m.f. source as shown in figure. Assuming that potential barrier developed in diode is 0.5 V, the value of current in the circuit is 100 K+ 2,5 V (1) 0.02 A (2) 0.025 A (3) 0.03 A (4) 0.05 A 27. For the logic circuit shown, which of the following input ABC will give an output 1: A B (1) 101 (2) 100 (3) 110 (4) 001 Y 28. Frequencies in the UHF range normally propagate by means of (1) Ground waves (2) Sky waves (3) Surface waves (4) Space waves 29. The velocity of a moving particle in a rotating reference frame is v' and angular velocity of rotating frame is o). If the value of Coriolis force on the particle is maximum, then angle between co and v' is (1) 0 (2) 45 (3) 90 (4) 180 30. If a circle is moving along X-axis with velocity v 0.5 c, then its shape observed in a stationary frame will be (1) circle (2) ellipse in which X-axis is minor axis. (3) ellipse in which X-axis is major axis. (4) parabola