Explanation

• The rate of change in displacement is referred to as velocity.
• The velocity of an object generally changes during its motion.
• The change in position is known as displacement.
• The maximum displacement from the mean position is called amplitude.

Last verified on 26-10-2026

Explanation

• Newton's second law states that the rate of change of momentum is directly proportional to the applied net force and occurs in the direction of that force.
• The mathematical form is F = Δp / Δt, where p represents momentum.
• For constant mass, the law is commonly written as F = ma.

Last verified on 26-10-2026

Explanation

• Einstein's mass-energy equation is E = mc^2.
• In this equation, E represents energy, m represents mass, and c represents the speed of light in a vacuum.
• The speed of light in a vacuum is approximately 3 x 10^8 metres per second.
• The equation shows that mass can be converted into energy and energy into mass.

Last verified on 26-10-2026

Explanation

• Water has maximum density at 4°C.
• When Water is in its Solid form (Ice) below 0°C.

Last verified on 27-10-2026

Explanation

• Petroleum, Coal, and Natural gas are all fossil fuels. 
• They are non-renewable energy sources 
• Major contributors to global energy production.
• Coal: A solid fossil fuel primarily derived from ancient swamp plants.
• Petroleum (Oil): from the remains of marine microorganisms like plankton.
• Natural gas: Composed of methane, often found in underground deposits alongside petroleum or coal

Last updated on 06-March-2026

Explanation

• The First Law of Thermodynamics states that energy can neither be created nor destroyed, only transformed from one form to another.
• Hence, it is essentially the law of conservation of energy.

Last verified on 26-10-2026

Explanation

• Frequency is the number of occurrences of a repeating event per unit of time.
• The SI unit of frequency is the hertz (Hz).
• 1 Hz = 1 cycle or vibration per second
• Unit: Hz = s⁻¹ (per second)
• Named after physicist Heinrich Hertz
• Used for waves, oscillations, sound, and electromagnetic radiation
• Derivations from other quantities: f = 1 / T
• Dimension T^−1

Explanation

• Force is defined as the rate of change of linear momentum with respect to time.
• According to Newton’s second law, force causes a change in an object’s momentum.

Last verified on 25-10-2026

Explanation

• Cocci are bacteria with a round or oval shape.
• Examples: Staphylococcus, Streptococcus.

Last verified on 26-10-2026

Explanation

• The liver is an accessory organ of the digestive system. Food does not pass through it.
• The liver produces bile, which helps emulsify fats into smaller droplets for easier digestion.
• The gallbladder stores and concentrates bile, releasing it into the small intestine when needed.

Last verified on 25-10-2026