Explanation

Materials that block the flow of electrons are called insulators.

They have high resistance and prevent electrical current from flowing through them.

Such as rubber or glass.

Explanation

Magnetic property: Thorium is a ferromagnetic metal, meaning it is capable of being magnetized.

Radioactive property: Thorium is also a radioactive metal, emitting alpha, beta, and gamma radiation due to its unstable atomic nucleus.

Explanation

Ethyl alcohol, or ethanol, is commonly used in perfumes as a base solvent.

It helps dissolve fragrance oils and allows the scent to disperse evenly when applied.

Explanation

A lock is a device used for raising and lowering boats,

ships and other watercraft between stretches of water of different levels on river and canal waterways.

Explanation

Salt is a mineral composed primarily of sodium chloride, a chemical compound belonging to the larger class of salts; salt in the form of a natural crystalline mineral is known as rock salt or halite.

Explanation

Phosphorous, especially red phosphorous, is used in the preparation of matchsticks because it ignites easily due to its rapid burning property.

It helps in the quick ignition of the match when struck.

Explanation

Stationary waves do not carry energy with them as it is stationary or does not change position.

Stationary waves do not transfer energy from one place to another. 

Explanation

Every living thing is made up mostly of water. Water is the most abundant substance in living organisms, making up approximately:

- 55-60% of an adult human's body weight

- 70-80% of a plant's weight

- 70-90% of an animal's weight

Water is essential for many biological processes, including:

- Regulating body temperature

- Transporting nutrients and oxygen

- Removing waste products

- Maintaining cell shape and structure

Water is truly the foundation of life!

Explanation

Photo resistors  are light sensitive variable resistors 

فوٹو ریزسٹرز روشنی کے حساس متغیر ریزسٹرس ہیں۔

Explanation

Metals make up the majority of elements in the periodic table, especially on the left and center.

They are generally good conductors, malleable, ductile, and have high melting points.