Explanation

A heat detector is used for finding fires by detecting significant increases in temperature

Types:

Some heat detectors respond to a rapid temperature increase ("rate-of-rise"),

While others activate when a specific temperature is reached ("fixed temperature"). 

Explanation

Electronics comprises the:

• Physics: Study of electrons, semiconductors, and electronic behavior.
• Engineering: Design, development, and testing of electronic systems and devices.
• Technology: Application of electronic principles to create devices, circuits, and systems.

Explanation

The human eye acts like a Camera, capturing light and focusing it onto the retina to form an image.

The eye's lens, aperture, and retina work together to create a visual representation of the world, similar to a camera's mechanism.

Explanation

A solid has a fixed shape and a definite volume, regardless of its container.

The particles (molecules, atoms, or ions) in a solid are closely packed and have a fixed position, giving the solid its rigidity and shape.

Explanation

Elastic deformation occurs when a material temporarily changes shape in response to an external force, but returns to its original dimensions when the force is removed.

This type of deformation is reversible, meaning the material returns to its original state.

Explanation

• The asteroid belt is a region of space where many small rocky bodies, called asteroids, orbit the Sun.
• It's also known as planetoids or minor planets.
• It is located between the orbits of Mars and Jupiter, spanning from about 2.2 to 3.2 astronomical units (AU) from the Sun.

Explanation

Kinetic energy (K.E) in terms of momentum is given by the formula:

K.E = p² / (2m)

Where:  

- p is momentum  

- m is mass  

Explanation

Excitation energy is the energy needed for an electron to jump from its ground state to a higher energy level.

It is less than ionization energy, as the electron remains bound to the atom after excitation.

Explanation

The condition of a fully charged lead-acid battery can be checked by:

Voltage: 2.1-2.2 volts per cell.

Gassing: Battery emits gas when fully charged.

Specific Gravity: 1.260-1.300 in the electrolyte.

Explanation

Telescopes are designed to collect and magnify light from distant objects, such as stars, planets, and galaxies.

They are ideal for viewing faint or dim objects in the night sky, as they can gather more light than the human eye alone.