The question asks for the correct definition of a "Virtual Private Network" (VPN). We need to analyze each option to determine which one accurately describes the core functionalities and characteristics of a VPN.
B) It is a computer network across a public internet that provides users access to their organizations network while maintaining the security of the information transmitted. This option precisely defines a VPN by highlighting its operation over a public internet, its role in providing remote access to private networks, and its emphasis on security (through encryption and tunneling).
The question asks about the function of a battery. A battery is a device designed to store energy and then release it in a usable form. We need to identify the form of energy it converts its stored chemical energy into.
Correct Option: A) Electrical energy — A battery stores chemical energy and converts it into electrical energy through electrochemical reactions. This electrical energy is then used to power various electronic devices.
The question asks to identify the atmospheric layer where free charged particles exist naturally. This requires knowledge of the different layers of the Earth's atmosphere and their characteristics.
A) Ionosphere — The Ionosphere is a region of the Earth's upper atmosphere, roughly from 60 km to 1,000 km altitude, that is ionized by solar and cosmic radiation. It contains a high concentration of free electrons and ions, making it the layer where free charged particles exist naturally in abundance.
The question asks about the mechanism that protects Earth from harmful electrically charged particles from space. This involves understanding Earth's natural defenses against solar radiation and cosmic rays.
Correct Option: A) The Earth's magnetic field diverts them towards its poles. This statement accurately describes the primary mechanism by which Earth protects itself from high-speed electrically charged particles from space. The magnetic field deflects these particles, channeling many of them towards the poles, preventing them from reaching the surface at other latitudes.
This question asks to identify a safety device that operates based on the heating effect of electric current. We need to recall the function of common electrical components and their underlying physical principles.
B) Fuse — A fuse is designed to melt and break an electrical circuit when the current exceeds a safe level, thereby protecting appliances and wiring. This operation is directly based on the heating effect of electric current (Joule heating).