Explanation

• Carbon dioxide (CO2) is a major greenhouse gas.
• It responsible for about 65% of the Earth's greenhouse effect.

Explanation

• A barcode reader, also called a price scanner or point-of-sale (POS) scanner.
• It is a hand-held or stationary input device.
• It used to capture and read information contained in a barcode.

Explanation

The Central Nervous System (CNS) comprises the:

• Brain, which processes information.
• The spinal cord, which relays messages between the brain and the body.
• The nerves, which transmit signals throughout the body.

Explanation

The atmospheric pressure at any place is measured by a Barometer

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The barometer was invented by Evangelista in 1644.

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Explanation

• The greenhouse effect is an environmental problem caused by the increasing amount of carbon dioxide (CO2) in the atmosphere.
• Primarily due to human activities such as burning fossil fuels, deforestation, and land-use changes.
• This excess CO2 traps heat and leads to global warming and climate change.

Explanation

• Short-sightedness (myopia) can be corrected by wearing a concave lens.
• It is thinner in the center than at the edges.
• This lens disperses light rays, allowing them to focus correctly on the retina.

Explanation

• The electricity from a cell (such as a battery) is Direct Current (DC).
• It is the flow of electric charge in one direction only, without changing direction.
• This is the type of current used in electronic devices such as smartphones, laptops, and televisions.

Explanation

• Ozone gas is a molecule made up of three oxygen atoms, with the chemical formula O3.
• This is different from ordinary oxygen, which has the chemical formula O2.

Explanation

• An Exothermic Reaction is a chemical reaction that releases or gives off heat, often accompanied by light, sound, or other forms of energy.
• This type of reaction involves a decrease in the system's energy, which is released into the surroundings as heat.

Explanation

• Chlorofluorocarbons (CFCs) are a type of synthetic compound that was widely used as refrigerants, propellants, and solvents.
• They are also responsible for the depletion of the ozone layer, which protects the Earth from harmful ultraviolet (UV) radiation.
• CFCs can rise to the stratosphere, where they are broken down by ultraviolet radiation, releasing chlorine atoms that catalytically destroy ozone molecules (O3).