Explanation

The crest is the part of a transverse wave where the particles of the medium are at the highest point, above the undisturbed position.

It is the peak or maximum displacement point in the wave.

Explanation

A stadiometer is specifically designed to measure a person's height accurately.

It typically consists of a vertical ruler with a movable headpiece for precise measurement.

Explanation

In a series circuit, the same current flows through all resistors because there is only one path for the current.

The total resistance is the sum of individual resistances, but the current remains unchanged throughout the circuit.

Explanation

The unit used to measure the latitude of the Earth is degrees (°), which can be broken down into minutes (′) and seconds (″).

The equator is the reference line for latitude.

It is defined as 0° latitude.

It divides the Earth into the Northern and Southern Hemispheres.

Explanation

The frequency of AC (Alternating Current) supply in Pakistan is typically 50 Hertz (Hz).

AC electricity alternates back and forth in a direction 50 times per second

Explanation

A chemical change alters both the appearance and the composition of a substance.

Examples include rusting of iron or burning of wood, where new substances are formed.

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

SpaceX uses giant "chopstick arms" on its launch tower to catch the Super Heavy booster during landing.

This system is part of its Starship program to make rocket recovery more efficient and reusable.

Explanation

Uranium is the most commonly used fuel in nuclear reactors due to its ability to undergo fission.

During fission, uranium atoms split to release a large amount of energy used for electricity generation.

Explanation

An aerosol is a colloidal suspension of liquid droplets in a gas, commonly air.

Examples include fog, mist, and spray deodorants.