Agniveer Navy: Science: Core Concepts and Exam Traps

Science questions for Agniveer Navy stay close to everyday physics, basic chemistry and human biology. Build solid ground in these areas:

Units and measurement: SI units for length, mass, time, force, pressure and energy; common conversions (1 km = 1000 m, 1 kg = 1000 g, 1 hour = 3600 s).
Motion and force: speed = distance/time; Newton's three laws in plain words; difference between mass and weight.
Work, energy and power: work = force × distance; power = work/time; the joule and the watt.
Light and sound: reflection, refraction, the rectilinear propagation of light; sound needs a medium and travels fastest in solids.
Heat: conduction, convection, radiation; melting and boiling points of water.
Chemistry basics: symbols of common elements, difference between elements, compounds and mixtures, acids/bases and litmus behaviour.
Biology: major organ systems, functions of the heart, lungs and kidneys, vitamins and their deficiency diseases, and basic classification of plants and animals.

Mass versus weight: mass is constant, weight changes with gravity.
Speed versus velocity: velocity includes direction.
Sound versus light: light travels far faster than sound - the reason thunder follows lightning.
Confusing mixtures with compounds: mixtures can be separated physically; compounds cannot.
Deficiency diseases: match the vitamin to the disease carefully (vitamin C–scurvy, vitamin D–rickets).

For any numerical item, write the formula first, then substitute units, then compute. If units disagree, convert before calculating.

Worked example: A cyclist covers 300 m in 20 s. Speed = distance/time = 300/20 = 15 m/s. Converting: 15 × 18/5 = 54 km/h.