Explanation

Cadmium is not a radioactive element.

It is a metal used in batteries and coatings.

Whereas Uranium and Plutonium are radioactive.

They used as nuclear fuels.

Explanation

The light from an ordinary lamp is hotter than a tube light because of incandescence.

The process by which light is produced through heat.

In an incandescent light bulb, an electric current heats a thin metal filament until it glows and produces light.

Explanation

Television Radio Phones spread signals through Electromagnetic Waves

Sound travels at approximately 1,100 feet per second (766 miles per hour).

while

Radio waves travel at the speed of light, which is approximately 186,000 miles per second.

Explanation

1. Oxygen: The most abundant element in the Earth's crust, making up about 47% of the Earth's mass.
2. Silicon: The second most abundant element in the Earth's crust, making up about 27.7% of the crust 
3. Aluminum: The third most abundant element in the Earth's crust, making up around 8.1%.

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

In Karst topography, both gypsum and dolomite are soluble.

They can form karst landscapes through dissolution.

This process is similar to limestone, though it occurs at varying rates.

Explanation

The process of applying a zinc coating to iron or steel to prevent rusting is called galvanizing.

This helps protect the metal from corrosion.

Explanation

Oxy-acetylene welding is a very common welding process.

Gases used in welding and cutting processes include:

• shielding gases such as carbon dioxide, argon, helium, etc.
• fuel gases such as acetylene, propane, butane, etc.

oxygen, used with fuel gases and also in small amounts in some shielding gas mixtures

Explanation

Electrons are lost in an oxidation reaction.

Oxidation simply means a gain of oxygen and an oxidizing agent is a substance that oxidizes something.

The reduction is the gain of electrons

Explanation

Hydrogen has an atomic weight of 1.00794u and accounts for 75% of the universe,

Thus making it the lightest and most abundant element in the universe.