Explanation

Efficiency is the ratio of output to input, often expressed as a percentage.

It represents how much of the input energy is actually converted into useful output energy, with the rest being lost as waste or heat.

Key Points:

• Energy is the ability to do work.
• Work is the transfer of energy through a force applied over a distance.
• Power is the rate at which work is done or energy is transferred.

Explanation

NaCl is a classic example of an ionic compound

Where sodium (Na) loses an electron to become a positively charged ion (cation),

And chlorine (Cl) gains an electron to become a negatively charged ion (an anion).

Formula: NaCl

Molar mass: 58.44 g/mol

IUPAC ID: Sodium chloride

Melting point: 801 °C

Soluble in: Water, Ammonia, Ethanol, Glycerol, Methanol, Propylene glycol, Formic acid, Formamide

Classification: Salt

Boiling point: 1,465 °C

Explanation

• Photosynthesis occurs during daytime because it depends on sunlight, which provides the energy necessary for the process to occur.
• Sunlight is the source of light energy that is absorbed by pigments such as chlorophyll.
• Which is then used to power the conversion of carbon dioxide and water into glucose and oxygen.

Explanation

• Enzymes are biological molecules made up of proteins, which catalyze chemical reactions, speeding up metabolic processes in living organisms.
• Proteins provide the structure and active site for enzymes to bind substrates and facilitate chemical reactions.

Explanation

• A plane mirror produces an image that is the same size as the object.
• The mirror doesn't magnify or reduce the image, it simply reflects it.

Explanation

Explanation

• Concave lenses are also known as diverging lenses. 
• Shape: Thinner in the middle and thicker at the edges.
• Image: They produce smaller, upright, virtual images.
• Use: Often used in eyeglasses to correct myopia (nearsightedness). 

Last updated on 09-03-2026

Explanation

A NOT gate, also known as an inverter.

It is a digital logic gate that negates the input signal.

If the input is "1", the output will be "0".

If the input is "0", the output will be "1".

The truth table for a NOT gate is:

Input | Output

-----|------

0 | 1

1 | 0

Explanation

• An electric motor converts electrical energy into mechanical energy, producing motion or rotation.
• It uses electromagnetic forces to generate torque, which drives a shaft or other mechanical components.

Explanation

Heat is a form of energy, specifically thermal energy, which is transferred from one body to another due to a temperature difference.

It is a type of kinetic energy, where the particles of a substance vibrate or move rapidly, generating heat.