Explanation

• Law of Inertia = Newton’s First Law of Motion.
• States: “An object at rest stays at rest, and an object in motion continues in the same direction and speed unless acted upon by an unbalanced force.”
• Explains why seat belts are important in cars.
• Applies to all objects on Earth and in space.

Last verified on 13-03-2026

Explanation

• The word ‘Scientia’ is derived from the Latin word Scientia which means ‘knowledge’.
• Science involves observation, experimentation, and analysis.
• The scientific method includes Hypothesis → Experiment → Observation → Conclusion.

Last verified on 13-03-2026

Explanation

• A stopwatch that measures to 0.1 seconds is typically a mechanical (analog) stopwatch
• The 0.1-second value represents the "least count" of the mechanical instrument
• Digital stopwatches often measure to 0.01s.
• These are commonly used in laboratories for timing experiments. 

Last updated 11-02-2026

Explanation

• The branch of chemistry that studies heat energy released or absorbed during chemical reactions is called Thermochemistry.
• It explains how heat changes occur during reactions such as combustion, neutralization, and dissolution.
• It deals with concepts like enthalpy change (ΔH), exothermic reactions, and endothermic reactions.

Last verified on 11-03-2026

Explanation

• Combustion is a chemical reaction in which a substance reacts rapidly with oxygen to produce heat and light.
• Commonly observed when wood, coal, or fuel burns.
• Combustion is an exothermic reaction because it releases energy.

Last verified on 10-03-2026

Explanation

Explanation

The standard equations of motion for an object moving with uniform (constant) acceleration are

v = u + at

This is the first equation of motion, relating final velocity to initial velocity, acceleration, and time

s = ut + (1/2)at²

This is the second equation of motion, relating displacement to initial velocity, acceleration, and time

v² = u² + 2as

This is the third equation of motion, relating final velocity to initial velocity, acceleration, and displacement

Where:

v = final velocity

u = initial velocity

a = acceleration

t = time

s = displacement.

These equations are used in kinematics, which is the study of motion.

They are applicable when dealing with constant acceleration and motion in a straight line. 

Explanation

• A magnet’s effect comes from aligned magnetic domains inside it.
• Heating the magnet above its Curie temperature randomizes the domains.
• Hammering or dropping physically disturbs the alignment of domains.
• Strong opposing magnetic fields can also demagnetize it.
• Therefore, the magnet’s effect can be destroyed by heat, shock, or strong opposing fields.

Last updated on 09-03-2026

Explanation

Explanation

• P-type semiconductor is made by doping pure silicon.
• Trivalent impurities (like boron, aluminum, gallium) are added.
• These atoms have 3 valence electrons.
• This creates holes (positive charge carriers) in the crystal.

Last updated on 09-March-2026