General Science
About 6 min · General Awareness · English
Time worked out from the lesson's 370 words at 150 words a minute, plus a minute for each question.
This section tests basic concepts from high school Physics, Chemistry and Biology—not advanced theory. Questions are typically factual ("What is the SI unit of force?") or application-based ("Which vitamin deficiency causes scurvy?").
Key ideas
- Physics is measurement and motion: Force, energy, work, power and their SI units form the backbone. Newton's laws govern motion; simple machines multiply force or speed.
- Electricity basics matter: Current (ampere), voltage (volt), resistance (ohm) and Ohm's law (V = IR). Know series vs parallel circuits and how household electricity works.
- Light and optics: Reflection, refraction, mirrors (concave/convex), lenses and the human eye. Remember: convex lens converges light, concave diverges.
- Chemistry revolves around elements and reactions: The periodic table organizes elements by atomic number. Metals, non-metals and metalloids have distinct properties.
- Acids, bases and salts: pH scale (0–14), common acids (HCl, H₂SO₄), bases (NaOH, Ca(OH)₂) and neutralization reactions yield salt + water.
Watch out for
- Confusing speed and velocity: Speed is scalar (magnitude only), velocity is vector (magnitude + direction). For speed, just use distance/time.
- Mixing up concave and convex: Concave mirror/lens curves inward (caves in), convex bulges outward. Concave mirror can form real or virtual images depending on object position; convex mirror always forms virtual, diminished images.
- Believing all metals conduct equally: While most metals conduct, conductivity varies. Silver conducts best, then copper, then gold, then aluminum. Non-metals like graphite (carbon form) also conduct—exception to the rule.
Quick reference
- SI unit trio: Force (newton), Energy (joule), Power (watt)
- Ohm's law shortcut: V = IR (Voltage equals Current times Resistance)
- pH memory: below 7 acidic, 7 neutral, above 7 basic
- Vitamin A → Eyes, C → Scurvy, D → Bones (rickets), K → Blood clotting
- Mitochondria = Cell's powerhouse; Nucleus = Control center; Ribosomes = Protein factories
Check yourself: 3 questions
1. Which of the following is the hardest naturally occurring substance on Earth?
2. The process by which green plants prepare their own food using sunlight, carbon dioxide and water is called:
3. A ball is thrown vertically upward. At the highest point of its motion, which of the following is correct?
This lesson is cut from the topic's note, not rewritten. Fact-checked on 18 Oct 2026: an AI-assisted check of this note against cited sources; the errors it found were corrected that day. Some errors may remain. The questions are from Shishya's validated question bank.
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