Tag: science & technology

Smoking cigars DOES cause lung cancer, as well as mouth, throat, and esophageal cancers. Even if cigar smokers don't inhale as deeply as cigarette smokers, they still absorb carcinogens through saliva and oral mucosa. Cigar smoke contains the same toxic and cancer-causing chemicals as cigarette smoke.

Cancer is a disease caused by uncontrolled cell growth within a person's body. Unlike infectious diseases, cancer cannot spread from one person to another through contact, air, or bodily fluids.

ROM (Read-Only Memory) is a type of computer memory that stores permanent instructions. As the name implies, the computer can read data from ROM but cannot write to or modify it, unlike RAM which is read-write.

Technician A is correct because digital signals are binary, existing in only one of two states (on or off, 1 or 0). Technician B is also correct because analog signals vary continuously and proportionally to represent the measured quantity.

RAM stands for Random Access Memory, a type of computer memory that allows data to be read and written in any order. 'Random access' means the computer can access any memory location directly without going through previous locations sequentially.

The binary system uses only two digits: 0 and 1. Digital computers use binary because their electronic components can easily represent two states (on/off), which form the basis for all digital computing and data storage.

Frequency is defined as the number of complete cycles that occur per unit of time. For AC signals, frequency determines how quickly the signal alternates direction and is measured in hertz (Hz).

A switch is the simplest digital sensor because it has only two states: open (off/0) or closed (on/1). This binary output makes switches fundamental digital sensors that detect presence, position, or pressure without complex circuitry.

One hertz is defined as one cycle per second. Named after Heinrich Hertz, this unit measures frequency across all periodic phenomena including electrical signals, sound waves, and mechanical vibrations.

Analog signals are continuous voltage signals that vary proportionally to the information being represented. Unlike digital signals that are discrete (1 or 0), analog signals can take any value within a range, making them ideal for representing real-world phenomena like sound or temperature.