Explanation

• The product of mass and velocity is known as momentum. P = MV
• If m is an object's mass and v is its velocity (also a vector quantity), then the object's momentum p is: p=mv
• It is a vector quantity.
• It having both magnitude and direction.
• Common symbols: p, p
• SI unit: kg⋅m⋅s−1
• Dimension MLT^−1

Last updated on 09-03-2026

Explanation

• A molecule is the smallest particle of a compound that retains the chemical properties of that compound.
• It is made up of two or more atoms chemically bonded together.
• Molecules can be elements (O₂, N₂) or compounds (H₂O, CO₂).

Last verified on 08-02-2026

Explanation

• An eraser is usually made of rubber, which does not attract magnets.
  • Magnetic materials are substances that are attracted by a magnet.
  • Materials like iron and steel are magnetic, while rubber or plastic items are non-magnetic.

Additional information:

• Common Magnetic Materials:
  • Iron
  • Nickel
  • Cobalt
  • Steel (paper clip, iron nail)
  • Some alloys
  Non-magnetic examples: Rubber, wood, plastic, paper.

Last verified on 07-03-2026

Explanation

• In solids, particles are tightly packed and cannot move freely.
• Their motion is limited to vibrations around fixed positions.
• Solids retain definite shape and volume due to limited particle motion.

Last verified on 07-03-2026

Explanation

Oxidation is a chemical reaction involving the loss of electrons. 

Oxidation:

When a substance loses electrons during a chemical reaction, it is said to be oxidized. 

Reduction:

The opposite of oxidation is reduction, which is when a substance gains electrons.

Last verified on 08-02-2026

Explanation

Metamorphic rocks are formed from pre-existing rocks (igneous, sedimentary, or older metamorphic rocks).

They are changed by high heat and/or pressure without melting.

Common examples include marble (from limestone) and gneiss (from granite).

The process is called metamorphism, meaning “change in form.”

Explanation

Aluminum is a metal that can be recycled many times without losing its properties.

Additional information:

• Recycling 1 ton of aluminum saves up to 95% of the energy required to make new aluminum.
• Aluminum is widely used in cans, foils, and packaging, making it highly recyclable.

Last verified on 16-01-2026

Explanation

A mixture of two or more metals (or a metal with non-metals) is called an alloy

An alloy is made by mixing metals.

It improves strength and durability.

Steel (iron and carbon), is an example of an alloy.

Explanation

Steel is most elastic among the rubber, steel, glass and sponge.

Steel having the most steep linear stress-strain curve among all.

A stiffer material will have a higher elastic modulus.

Explanation

Lithium is the lightest metal.

Density of 0.534 g/cm³.

It is an alkali metal,

The third element on the periodic table,

It is soft enough to be cut with a knife.

Uses: Due to its low density and high reactivity, it's used in aircraft and, famously, in the production of batteries for electric vehicles and consumer electronics.