Practice MCQs

Explanation: IoT (Internet of Things) refers to the network of physical devices, vehicles, appliances and other objects embedded with sensors and software that collect and exchange data over the internet.

Explanation: Cloud computing delivers computing services — including servers, storage, databases, networking, software — over the internet ("the cloud") to offer faster innovation, flexible resources and economies of scale.

Explanation: Blockchain is a decentralized, distributed digital ledger that records transactions across many computers. It is the underlying technology of cryptocurrencies like Bitcoin and enables transparency and security.

Explanation: 5G stands for Fifth Generation wireless technology. It offers significantly faster speeds, lower latency and greater capacity than 4G LTE, enabling advanced applications like IoT and autonomous vehicles.

Explanation: Artificial Intelligence (AI) is the simulation of human intelligence processes by machines, especially computers. It includes learning, reasoning, problem-solving, perception and language understanding.

Explanation: Acid rain is caused by sulfur dioxide (SO2) and nitrogen oxides (NOx) from burning fossil fuels reacting with water in the atmosphere to form sulfuric and nitric acids.

Explanation: Carbon dioxide (CO2) produced by burning fossil fuels is the primary human-caused contributor to global warming. Though less potent than methane, it persists longer in the atmosphere.

Explanation: Biodiversity refers to the variety and variability of life on Earth, including diversity within species, between species and of ecosystems. High biodiversity indicates a healthy ecosystem.

Explanation: Chlorofluorocarbons (CFCs), once used in refrigerants and aerosols, are the main cause of ozone depletion. UV radiation breaks them down to release chlorine atoms that destroy ozone molecules.

Explanation: The greenhouse effect occurs when greenhouse gases (CO2, methane, water vapor etc.) in the atmosphere trap heat from the sun, warming the Earth's surface. Human activities have enhanced this effect.