General Science – Basic MCQ Quiz 3

General Science MCQ Quiz 3 – Concept Booster

This General Science MCQ Quiz 3 concept booster is designed to strengthen your understanding of basic science concepts for SSC and RRB exams. It covers important topics from Physics, Chemistry, and Biology, focusing on commonly asked general science questions for SSC and RRB science MCQ. Use this section to revise key concepts, improve clarity, and enhance your performance in competitive exam science questions. Regular revision of these concepts will help you answer basic science MCQ questions quickly and accurately.

1️⃣ Cell – The Basic Unit of Life

The cell is known as the structural and functional unit of life. Every living organism, whether plant or animal, is made up of cells. Cells perform all essential life processes such as respiration, digestion, reproduction and growth. There are two main types of cells: prokaryotic cells (without a true nucleus) and eukaryotic cells (with a well-defined nucleus). In competitive exams, questions often test basic understanding of cell structure and functions.

2️⃣ Lungs and the Process of Breathing

Breathing is part of the respiratory system. The lungs are the main organs responsible for respiration in humans. During inhalation, oxygen enters the lungs and passes into the bloodstream. During exhalation, carbon dioxide is removed from the body. Efficient functioning of lungs ensures proper oxygen supply to all body tissues. Questions on human organs and their functions are very common in General Science sections.

3️⃣ Vitamin K and Blood Clotting

Vitamins are essential micronutrients required for proper body functioning. Vitamin K plays a crucial role in blood clotting. Without Vitamin K, excessive bleeding may occur because the blood cannot clot properly. In exams, you should remember the key functions of major vitamins:

• Vitamin A – Vision
• Vitamin B – Energy metabolism
• Vitamin C – Immunity and healing
• Vitamin D – Bone health
• Vitamin K – Blood clotting

4️⃣ Boiling Point of Water and Temperature Measurement

The boiling point of water at standard atmospheric pressure is 100 degrees Celsius. Temperature is commonly measured in Celsius, Fahrenheit and Kelvin. In most competitive exams, Celsius is used for everyday temperature measurements. Understanding units of measurement is important in Physics-based questions.

5️⃣ Roots and Absorption in Plants

Plants absorb water and minerals from the soil through their roots. The root system anchors the plant and helps in nutrient absorption. Root hairs increase the surface area for better absorption. Water absorbed by roots travels upward through xylem tissues to other parts of the plant. Questions on plant anatomy and functions are frequently asked in exams.

6️⃣ Tooth Enamel – Hardest Substance in Human Body

Tooth enamel is the hardest substance in the human body. It forms the outer protective covering of teeth and protects them from physical and chemical damage. Although bones are strong, enamel is harder than bone. Human body-related static facts like this are commonly asked in SSC and RRB exams.

7️⃣ Ammeter and Measurement of Electric Current

Electric current is measured using an ammeter. It is connected in series in an electric circuit to measure the flow of current. Other instruments include:

• Voltmeter – Measures voltage
• Ohmmeter – Measures resistance
• Thermometer – Measures temperature
• Barometer – Measures atmospheric pressure

Basic instrument-based questions are common in Physics sections.

8️⃣ Photosynthesis and Oxygen Release

Photosynthesis is the process by which green plants prepare their food using sunlight, carbon dioxide and water. During this process, oxygen is released as a by-product. The equation of photosynthesis can be summarized as:

Carbon dioxide + Water + Sunlight → Glucose + Oxygen

Understanding this process is important because it forms the base of life on Earth.

9️⃣ Nucleus – Centre of an Atom

An atom consists of three main particles: protons, neutrons and electrons. The nucleus is the central part of the atom and contains protons and neutrons. Electrons revolve around the nucleus in specific energy levels. Atomic structure is a fundamental Chemistry concept frequently tested in competitive exams.

🔟 Sound Travels Fastest in Solids

Sound requires a medium to travel. It cannot travel in vacuum because there are no particles to carry vibrations. Sound travels fastest in solids, slower in liquids and slowest in gases. This is because particles in solids are closely packed, allowing vibrations to pass quickly.

Quick Q&A Revision

• Basic unit of life? → Cell
• Organ for breathing? → Lungs
• Vitamin for clotting? → Vitamin K
• Boiling point measured in? → Celsius
• Water absorbed by? → Roots
• Hardest substance in body? → Enamel
• Electricity measured by? → Ammeter
• Gas released in photosynthesis? → Oxygen
• Centre of atom? → Nucleus
• Sound travels fastest in? → Solids

Final Revision Tips

• Focus on basic science concepts like cell, respiration, and photosynthesis
• Remember important instruments and units (ammeter, Celsius, etc.)
• Revise human body and plant biology topics regularly
• Practice basic science MCQs daily to improve speed and accuracy
• Use this General Science MCQ Quiz for quick revision before exams