Top 50 General Science MCQs for SSC, Railway, Nursing & Government Job Exams

General Science is an important scoring area in many competitive examinations, including SSC, Railway, Nursing entrance and recruitment exams, State Government exams, Police exams, Group C/D recruitment, and other government job examinations.

Questions are usually asked from basic Biology, Physics, Chemistry, Human Physiology, Environment, Nutrition, Diseases, Everyday Science, and General Scientific Facts.

The best way to prepare is not only to memorise answers but also to understand the basic concept behind each question.

Below are 50 important General Science MCQs with answers and short explanations that are useful for competitive exam preparation.

Top 50 General Science MCQs

1. Which organ mainly filters waste products from the blood?

A. Heart B. Kidney C. Liver D. Lungs

Correct Answer: B. Kidney

Explanation: Kidneys filter the blood and remove waste products and excess water to form urine.

1. What is the functional unit of the kidney?

A. Neuron B. Nephron C. Alveolus D. Villus

Correct Answer: B. Nephron

Explanation: The nephron is the microscopic structural and functional unit responsible for filtration and urine formation.

1. Which organelle is known as the powerhouse of the cell?

A. Ribosome B. Nucleus C. Mitochondrion D. Golgi apparatus

Correct Answer: C. Mitochondrion

Explanation: Mitochondria produce ATP, the main usable energy source of cells.

1. Which blood cells help in fighting infections?

A. RBCs B. WBCs C. Platelets D. Plasma cells only

Correct Answer: B. WBCs

Explanation: White blood cells are an important part of the immune system and help protect the body against infections.

1. Which component of blood helps in clotting?

A. Red blood cells B. Platelets C. Plasma only D. Haemoglobin

Correct Answer: B. Platelets

Explanation: Platelets participate in the blood-clotting process and help stop bleeding after injury.

1. Haemoglobin contains which mineral?

A. Calcium B. Iron C. Sodium D. Potassium

Correct Answer: B. Iron

Explanation: Iron is an essential component of haemoglobin, which carries oxygen in the blood.

1. Which blood group is commonly called the universal red-cell donor?

A. AB positive B. O negative C. A positive D. B negative

Correct Answer: B. O negative

Explanation: O-negative red blood cells lack A, B and Rh(D) antigens, so they are commonly used in emergencies when the recipient's blood type is unknown.

1. Which blood group is commonly called the universal red-cell recipient?

A. AB positive B. O negative C. A negative D. B positive

Correct Answer: A. AB positive

Explanation: AB-positive individuals can generally receive red blood cells from all ABO and Rh blood groups.

1. Which chamber of the human heart has the thickest muscular wall?

A. Right atrium B. Left atrium C. Right ventricle D. Left ventricle

Correct Answer: D. Left ventricle

Explanation: The left ventricle pumps oxygenated blood to the entire body and therefore needs a thick muscular wall.

1. Which blood vessel carries oxygenated blood from the lungs to the heart?

A. Pulmonary artery B. Pulmonary vein C. Aorta D. Vena cava

Correct Answer: B. Pulmonary vein

Explanation: Pulmonary veins carry oxygen-rich blood from the lungs to the left atrium.

Biology and Human Physiology MCQs 11. The largest organ of the human body is:

A. Liver B. Brain C. Skin D. Lung

Correct Answer: C. Skin

Explanation: Skin is the body's largest organ by surface area and overall weight.

1. The largest internal organ in the human body is:

A. Heart B. Liver C. Kidney D. Pancreas

Correct Answer: B. Liver

Explanation: The liver is the largest internal solid organ and performs many metabolic and detoxification functions.

1. Which is the largest bone in the human body?

A. Humerus B. Tibia C. Femur D. Radius

Correct Answer: C. Femur

Explanation: The femur, or thigh bone, is the longest and strongest bone in the human body.

1. Which is the smallest bone in the human body?

A. Stapes B. Radius C. Ulna D. Patella

Correct Answer: A. Stapes

Explanation: The stapes is a tiny bone located in the middle ear.

1. Which part of the brain controls balance and coordination?

A. Cerebrum B. Cerebellum C. Medulla D. Hypothalamus

Correct Answer: B. Cerebellum

Explanation: The cerebellum coordinates voluntary movements, posture and balance.

1. Which part of the brain controls breathing and heartbeat?

A. Cerebrum B. Cerebellum C. Medulla oblongata D. Frontal lobe

Correct Answer: C. Medulla oblongata

Explanation: The medulla controls several involuntary functions including respiration and heart rate.

1. Which structure prevents food from entering the windpipe?

A. Uvula B. Epiglottis C. Trachea D. Larynx

Correct Answer: B. Epiglottis

Explanation: The epiglottis closes over the airway during swallowing.

1. Gas exchange in the lungs mainly occurs in the:

A. Bronchi B. Trachea C. Alveoli D. Diaphragm

Correct Answer: C. Alveoli

Explanation: Alveoli are tiny air sacs surrounded by capillaries where oxygen and carbon dioxide are exchanged.

1. Which organ secretes insulin?

A. Liver B. Pancreas C. Kidney D. Thyroid

Correct Answer: B. Pancreas

Explanation: Beta cells in the pancreatic islets produce insulin.

1. Insulin mainly helps to:

A. Increase blood glucose B. Decrease blood glucose C. Increase blood pressure D. Increase body temperature

Correct Answer: B. Decrease blood glucose

Explanation: Insulin promotes glucose uptake and storage, helping lower blood glucose levels.

Vitamins, Nutrition and Diseases 21. Deficiency of Vitamin C causes:

A. Rickets B. Scurvy C. Beriberi D. Night blindness

Correct Answer: B. Scurvy

Explanation: Vitamin C deficiency causes scurvy, which can lead to bleeding gums and poor wound healing.

1. Deficiency of Vitamin D causes:

A. Scurvy B. Rickets C. Beriberi D. Pellagra

Correct Answer: B. Rickets

Explanation: Vitamin D is required for calcium absorption and healthy bone development.

1. Deficiency of Vitamin A may cause:

A. Night blindness B. Scurvy C. Anaemia D. Beriberi

Correct Answer: A. Night blindness

Explanation: Vitamin A is important for normal vision, especially in dim light.

1. Deficiency of Vitamin B1 causes:

A. Beriberi B. Scurvy C. Rickets D. Goitre

Correct Answer: A. Beriberi

Explanation: Vitamin B1, or thiamine, is important for nerve and energy metabolism.

1. Which mineral is essential for healthy bones and teeth?

A. Iron B. Calcium C. Iodine D. Sodium

Correct Answer: B. Calcium

Explanation: Calcium plays a major role in bone and tooth structure.

1. Iodine deficiency commonly causes:

A. Goitre B. Rickets C. Scurvy D. Anaemia

Correct Answer: A. Goitre

Explanation: Iodine is required for thyroid hormone production. Deficiency can enlarge the thyroid gland.

1. Iron deficiency commonly causes:

A. Anaemia B. Diabetes C. Goitre D. Hypertension

Correct Answer: A. Anaemia

Explanation: Iron deficiency can reduce haemoglobin production and cause iron-deficiency anaemia.

1. Which vitamin is important for normal blood clotting?

A. Vitamin A B. Vitamin C C. Vitamin K D. Vitamin E

Correct Answer: C. Vitamin K

Explanation: Vitamin K is required for the synthesis of several clotting factors.

Plant Science MCQs 29. Photosynthesis mainly occurs in:

A. Mitochondria B. Chloroplasts C. Ribosomes D. Vacuoles

Correct Answer: B. Chloroplasts

Explanation: Chloroplasts contain chlorophyll and are the main site of photosynthesis in plant cells.

1. The green pigment present in plants is:

A. Haemoglobin B. Chlorophyll C. Melanin D. Keratin

Correct Answer: B. Chlorophyll

Explanation: Chlorophyll absorbs light energy used during photosynthesis.

1. Which gas is absorbed by plants during photosynthesis?

A. Oxygen B. Nitrogen C. Carbon dioxide D. Hydrogen

Correct Answer: C. Carbon dioxide

Explanation: Plants use carbon dioxide and water to produce glucose during photosynthesis.

1. Which gas is mainly released during photosynthesis?

A. Carbon dioxide B. Oxygen C. Nitrogen D. Methane

Correct Answer: B. Oxygen

Explanation: Oxygen is released as a by-product of the light-dependent reactions of photosynthesis.

1. Water and minerals are mainly absorbed by plants through:

A. Flowers B. Root hairs C. Fruits D. Stem bark

Correct Answer: B. Root hairs

Explanation: Root hairs increase the surface area available for absorption from soil.

Physics MCQs 34. What is the SI unit of force?

A. Joule B. Newton C. Watt D. Pascal

Correct Answer: B. Newton

Explanation: Force is measured in newtons (N).

1. What is the SI unit of work?

A. Joule B. Watt C. Newton D. Ampere

Correct Answer: A. Joule

Explanation: Work and energy are measured in joules.

1. What is the SI unit of power?

A. Joule B. Watt C. Newton D. Volt

Correct Answer: B. Watt

Explanation: Power is the rate at which work is done and is measured in watts.

1. What is the SI unit of electric current?

A. Volt B. Ohm C. Ampere D. Watt

Correct Answer: C. Ampere

Explanation: Electric current is measured in amperes.

1. Which instrument measures electric current?

A. Voltmeter B. Ammeter C. Barometer D. Hydrometer

Correct Answer: B. Ammeter

Explanation: An ammeter is connected in series to measure electric current.

1. Which instrument measures atmospheric pressure?

A. Thermometer B. Barometer C. Hygrometer D. Ammeter

Correct Answer: B. Barometer

Explanation: A barometer measures atmospheric pressure.

1. Sound cannot travel through:

A. Air B. Water C. Steel D. Vacuum

Correct Answer: D. Vacuum

Explanation: Sound requires a material medium for propagation.

1. The pitch of a sound mainly depends on its:

A. Amplitude B. Frequency C. Speed D. Intensity

Correct Answer: B. Frequency

Explanation: Higher-frequency sounds are perceived as having a higher pitch.

1. Loudness of sound mainly depends on:

A. Frequency B. Amplitude C. Wavelength only D. Speed only

Correct Answer: B. Amplitude

Explanation: Greater amplitude generally produces a louder sound.

1. Which type of mirror is commonly used as a rear-view mirror in vehicles?

A. Plane mirror B. Concave mirror C. Convex mirror D. Cylindrical mirror

Correct Answer: C. Convex mirror

Explanation: A convex mirror provides a wider field of view and produces upright, diminished images.

1. Which lens is used to correct myopia?

A. Convex lens B. Concave lens C. Cylindrical lens only D. Bifocal lens only

Correct Answer: B. Concave lens

Explanation: A concave lens diverges light and helps focus the image correctly on the retina in myopia.

Chemistry MCQs 45. What is the chemical formula of water?

A. CO₂ B. H₂O C. O₂ D. H₂O₂

Correct Answer: B. H₂O

Explanation: A water molecule contains two hydrogen atoms and one oxygen atom.

1. Which gas turns lime water milky?

A. Oxygen B. Hydrogen C. Carbon dioxide D. Nitrogen

Correct Answer: C. Carbon dioxide

Explanation: Carbon dioxide reacts with calcium hydroxide to produce calcium carbonate, which makes lime water appear milky.

1. Which acid is present in the human stomach?

A. Sulphuric acid B. Hydrochloric acid C. Nitric acid D. Acetic acid

Correct Answer: B. Hydrochloric acid

Explanation: Hydrochloric acid in gastric juice helps digestion and destroys many microorganisms.

1. Which acid is present in vinegar?

A. Acetic acid B. Citric acid C. Hydrochloric acid D. Sulphuric acid

Correct Answer: A. Acetic acid

Explanation: Vinegar contains dilute acetic acid.

1. A substance with pH less than 7 is generally:

A. Basic B. Neutral C. Acidic D. Metallic

Correct Answer: C. Acidic

Explanation: At ordinary conditions, a pH below 7 indicates acidity, while a pH above 7 indicates basicity.

1. Rusting of iron requires:

A. Oxygen only B. Water only C. Oxygen and moisture D. Carbon dioxide only

Correct Answer: C. Oxygen and moisture

Explanation: Rusting is an oxidation process that normally requires both oxygen and water.

Quick Answer Key Q. Answer Q. Answer 1 B 26 A 2 B 27 A 3 C 28 C 4 B 29 B 5 B 30 B 6 B 31 C 7 B 32 B 8 A 33 B 9 D 34 B 10 B 35 A 11 C 36 B 12 B 37 C 13 C 38 B 14 A 39 B 15 B 40 D 16 C 41 B 17 B 42 B 18 C 43 C 19 B 44 B 20 B 45 B 21 B 46 C 22 B 47 B 23 A 48 A 24 A 49 C 25 B 50 C Topic-Wise Distribution of These 50 Questions

These MCQs cover the major General Science areas frequently useful for competitive exams:

Biology & Human Physiology

Questions on blood, heart, kidney, brain, lungs, hormones and organs.

Nutrition & Diseases

Questions on vitamins, minerals, deficiency diseases and basic nutrition.

Botany

Questions on photosynthesis, chlorophyll and plant absorption.

Physics

Questions on force, power, current, sound, optics and measuring instruments.

Chemistry

Questions on acids, pH, water, carbon dioxide and oxidation.

How to Prepare General Science for Competitive Exams

General Science is often easier to score in than highly calculation-based sections if candidates build strong basic concepts.

A practical preparation strategy is:

1. Build Class 6–10 Science Fundamentals

Most SSC, Railway and general government-job science questions are based on fundamental school-level science.

Focus on:

Human body Nutrition Diseases Plants Motion and force Heat Light Sound Electricity Acids, bases and salts Metals and non-metals Everyday chemistry. 2. Study Biology Regularly

Biology questions are particularly important in exams connected with:

Nursing Health recruitment General Science Railway exams State-level recruitment.

Important areas include:

Blood Heart Digestive system Respiratory system Nervous system Endocrine system Vitamins Diseases Reproduction Genetics Plant physiology. 3. Learn Science Through MCQs

Instead of reading the same chapter repeatedly, solve questions immediately after learning a concept.

For example:

Concept: Vitamin C deficiency causes scurvy.

Then practise related questions:

Which vitamin prevents scurvy? Which vitamin helps collagen formation? Which disease is caused by Vitamin C deficiency?

This helps convert information into exam-ready knowledge.

1. Revise Wrong Answers

Create a separate notebook or digital note called:

“Science Mistakes”

Whenever you answer incorrectly, write:

Question → Correct Answer → One-line Concept

Revision of mistakes is usually more useful than repeatedly solving questions you already know.

1. Practise Mixed Science Tests

Do not prepare Biology, Physics and Chemistry only in isolation.

Competitive exams normally mix all three.

A good revision cycle can be:

20 Biology MCQs + 15 Physics MCQs + 15 Chemistry MCQs

This simulates a mixed General Science section.

Important General Science Topics for SSC Exams

SSC aspirants should focus especially on:

Human body systems Vitamins and deficiency diseases Diseases and pathogens SI units Motion and force Work, energy and power Heat and temperature Sound Light Electricity Acids, bases and salts Metals Periodic-table basics Everyday science. Important Science Topics for Railway Exams

For Railway examinations such as RRB Group D and other applicable RRB recruitments, candidates should pay particular attention to school-level:

Physics

Motion, force, work, energy, electricity, magnetism, heat, light and sound.

Chemistry

Atoms, molecules, acids, bases, salts, metals, non-metals and everyday chemical reactions.

Biology

Human body, nutrition, diseases, environment, plants and basic life science.

Important Science Topics for Nursing Exams

Nursing entrance and recruitment examinations generally require stronger Biology and Human Physiology preparation.

High-priority areas include:

Anatomy and physiology Blood Heart Respiratory system Kidney Nervous system Hormones Vitamins Nutrition Communicable diseases Immunity Microbiology basics.

Candidates preparing for ANM, GNM or other nursing-related exams should give these areas additional revision.

Frequently Asked Questions Are these MCQs useful for SSC exams?

Yes. These questions cover basic General Science concepts commonly relevant to SSC-level preparation, including Biology, Physics and Chemistry.

Are these questions useful for Railway exams?

Yes. The set includes school-level General Science concepts that are useful for RRB and other Railway recruitment preparation.

Are these MCQs useful for ANM/GNM and Nursing exams?

Yes. A substantial portion of the set covers Human Biology, physiology, vitamins and health-related science, which are particularly useful for nursing entrance and recruitment exams.

Which science subject is most important?

It depends on the examination.

For nursing exams, Biology/Human Physiology usually deserves extra attention.

For broad SSC and Railway preparation, candidates should maintain a balanced preparation across Physics, Chemistry and Biology.

How many General Science MCQs should I practise daily?

A practical target is around 30–50 quality MCQs daily, followed by revision of incorrect answers.

Quality of review is more important than solving hundreds of questions without understanding mistakes.

Should I memorise only answers?

No.

Try to learn at least one basic concept behind every answer.

For example:

Question: Sound cannot travel through what? Answer: Vacuum.

Do not stop there. Remember the concept:

Sound is a mechanical wave and requires a material medium.

That single concept can solve several related questions.

Final Words

General Science can become a highly scoring area in SSC, Railway, Nursing and Government Job examinations if candidates focus on basic concepts and regular MCQ practice.

The 50 questions above cover important topics from:

Biology Human Physiology Vitamins & Nutrition Botany Physics Chemistry Everyday Science

Do not just read the answers once.

A better method is:

Attempt → Check Answer → Read Explanation → Mark Mistakes → Revise Again

Regular practice with this approach can improve both accuracy and confidence in General Science sections.

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