Explanation

• Phenolphthalein is a pH indicator that changes color in response to changes in acidity or basicity.
• In an acidic medium, it is colorless, and in a basic medium, it turns pink.

Explanation

Explanation

• The heat from the Sun reaches Earth in the form of electromagnetic waves, which is called radiation.
• This includes ultraviolet (UV) rays, visible light, and infrared (IR) rays.
• Radiation is the transfer of energy through electromagnetic waves, without the need for a medium like air or water.

Explanation

• In the human heart, blood returning from the lungs via the pulmonary veins drains into the left atrium.
• From there, it flows through the mitral valve into the left ventricle, which pumps it out to the rest of the body through the aorta.

Explanation

Explanation

• Red (R) Green (G) and blue (B) colors are known as primary colors of light.
• Because of mixing these three colors we are able to make all possible colors.

Key Point

The primary colors of Pigment is:

• Red
• Yellow
• Blue

Explanation

• The rotation of the Earth on its axis causes day and night.
• As different parts of the planet face towards or away from the Sun.

Explanation

A response is the organism's reaction or adaptation to a change in the environment.

Such as a change in temperature, light, or sound.

Explanation

A transistor is a semiconductor component that can be used either as a switch or an amplifier.

It controls the flow of electrical current in a circuit and is fundamental in electronic devices.

Explanation

Hydraulic power systems use fluids to transmit power and motion, and the most common fluids used are:

• Water (in hydraulic systems like water supply networks, fire suppression systems, and hydroelectric power plants)
• Oil (in hydraulic systems like heavy machinery, construction equipment, and industrial manufacturing)
• Non-compressible fluids (like hydraulic fluids, brake fluids, and transmission fluids) that are specifically designed for hydraulic systems.