The logic gate equivalent to the given logic circuit is :-

The physical sizes of the transmitter and receiver antenna in a communication system are :-

The area of a square is 5.29 cm². The area of 7 such squares taking into account the significant figures is :-

50 W/m² energy density of sunlight is normally incident on the surface of a solar panel. Some part of incident energy (25%) is reflected from the surface and the rest is absorbed. The force exerted on 1m² surface area will be close to (c = 3 × 108 m/s) :-