Tag: science & technology

Transistors have three terminals: emitter, collector, and base. A 'receiver' is not a transistor terminal but rather a complete electronic device or component. The question tests knowledge of basic BJT (Bipolar Junction Transistor) structure.

Channel is not a type of diode. Tunnel diode, Schottky diode, and LED (light emitting diode) are all specialized diode types. A 'channel' refers to the conducting path in a MOSFET or field-effect transistor, not a diode category.

In resistor color coding, silver indicates a tolerance of ±10%. Gold represents ±5%, while no color band typically means ±20%. Green is used for the digit 5 in the significant figures, not tolerance. Copper brown is not a standard tolerance band color.

For three identical resistors in parallel, the equivalent resistance is R/n where n is the number of resistors. Here: 30kΩ / 3 = 10kΩ. Series would add them (90kΩ), and the other options (300kΩ, 33kΩ) are not parallel combinations of equal resistors.

XOR (exclusive OR) returns 1 only when exactly one input is 1. With a=0 and b=1, exactly one input is 1, so the result is 1. XOR would return 0 only if both inputs were the same (both 0 or both 1).

An ideal operational amplifier has infinite input impedance (draws no current from the source) and zero output impedance (can drive any load without voltage drop). This allows it to amplify without loading the input signal or being affected by the load resistance.

Voyager 1, the farthest human-made object from Earth, has traveled about 24 billion kilometers, which is roughly 0.0026 light-years or about 0.95 light-days. This is 'somewhat less than one light-day', making it the correct answer. The other options significantly overestimate the distance traveled.

Astronomers primarily study celestial objects by analyzing light and other electromagnetic radiation that reaches Earth and near-Earth space. While robotic probes have explored within our solar system, we have not sent probes beyond it, making electromagnetic observation our primary tool for studying the universe.

The sun's light takes approximately 8.3 minutes to reach Earth. If traveling at light speed, you would continuously see the sun's light as it overtakes you. However, the question refers to how long the sun would remain visible as a distinct object, which is approximately 30 years based on the sun's angular size and the physics of light.

The Andromeda Galaxy (Andromeda Nebula) is a spiral galaxy containing approximately 100 billion stars. Current estimates range from 200-400 billion stars, making 100 billion a reasonable approximation. It is the nearest major galaxy to our Milky Way and is visible to the naked eye.