Explanation

The bubble tube set at a 45° angle is used to check inclined or sloped surfaces.

It helps ensure surfaces are accurately angled.

Explanation

GPS satellites orbit the Earth at an altitude of approximately 20,200 kilometers (12,550 miles).

They travel in medium Earth orbit (MEO). 

Each satellite orbits the Earth in a circular path, completing one orbit roughly every 12 hours.

The GPS constellation consists of 24 satellites, strategically positioned to provide global coverage. 

Explanation

A force is a vector quantity.

Force is requires both magnitude (strength) and direction to be fully described.

Explanation

In the double-touch method, opposite poles (north and south) of two magnets are rubbed on the material in opposite directions to magnetize it effectively.

This helps align more magnetic domains inside the material.

Explanation

A comet grows a tail when it approaches the Sun due to the heat causing the ice to vaporize, releasing gas and dust.

This process forms a glowing coma and tail, which always points away from the Sun due to solar wind.

Explanation

Ultrasound imaging uses high-frequency sound waves to create images of internal body structures.

These waves reflect off tissues and organs, and the echoes are used to form detailed images.

Explanation

Uncontrolled nuclear reactions release ionizing radiation (like gamma rays), which can cause cancer and genetic mutations.

This radiation damages living cells, making such reactions highly dangerous.

Explanation

A fuse melts quickly when current exceeds safe limits due to its low melting point.

This breaks the circuit and prevents damage to appliances or wiring.

Explanation

• Attenuation refers to the decrease in strength or intensity of a signal as it travels through a medium or is processed by a system.
• This can occur due to various factors such as resistance, impedance, or absorption, and can affect the quality and fidelity of the signal.

Explanation

Optical disk drives (like CD, DVD, and Blu-ray drives) use laser technology to read and write data on optical discs.

The laser beam detects the pits and lands on the disc surface to interpret data.