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

Explanation

• Carnivores are animals that eat only meat, primarily from other animals.
• Examples of carnivores include lions, tigers, bears, wolves, and sharks.

Additional information:

• Animals that eat plants exclusively are herbivores.
• Animals that eat both plants and meat are called omnivores.

Last verified on 07-03-2026

Explanation

• Amphibians are animals that live both in water and on land.
• Most amphibians lay their eggs in water because their eggs do not have a protective shell.
• Examples of Amphibians: Frog, Toad, Salamander, Newt, Caecilian

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