50 RRB Group D MCQs With Answers
Preparing for the RRB Group D exam becomes easier when you practice high-quality MCQs that reflect the actual exam pattern. Below you’ll find 50 important MCQs covering General Science, GK, Reasoning, and Maths. Each question includes four options, the correct answer, and a clear 50-word explanation to strengthen your understanding.
1. Which gas is essential for human respiration?
A. Nitrogen
B. Oxygen
C. Carbon monoxide
D. Helium
Correct Answer: B
Explanation: Oxygen is vital for cellular respiration, where the body converts nutrients into energy. It enters the bloodstream through the lungs and supports essential organ functions. Without oxygen, cells cannot produce energy, leading to failure of vital systems. Thus, oxygen is the most important gas for sustaining human life.
2. Which metal is used in making electric wires?
A. Iron
B. Lead
C. Copper
D. Mercury
Correct Answer: C
Explanation: Copper is widely used for wiring because of its excellent electrical conductivity and flexibility. It offers minimal resistance, ensuring smooth current flow. Although silver conducts better, it’s expensive, making copper the most economical and practical choice. Its durability also ensures long-lasting and safe wiring systems in households and industries.
3. Who is known as the ‘Father of the Nation’ in India?
A. Jawaharlal Nehru
B. B. R. Ambedkar
C. Mahatma Gandhi
D. Sardar Patel
Correct Answer: C
Explanation: Mahatma Gandhi earned this title due to his non-violent leadership in India’s freedom struggle. His principles of peace, truth, and civil disobedience inspired millions. Gandhi’s philosophy not only shaped India’s independence movement but also influenced global civil rights leaders across continents, marking him as a symbol of justice.
4. What is the boiling point of water at sea level?
A. 80°C
B. 90°C
C. 100°C
D. 120°C
Correct Answer: C
Explanation: Water boils at 100°C under standard atmospheric pressure at sea level. At this temperature, water molecules gain enough energy to move rapidly and turn into vapor. This concept is a basic part of science and helps explain everyday processes like cooking, steam production, and weather changes.
5. Who wrote the national anthem of India?
A. Bankim Chandra Chattopadhyay
B. Rabindranath Tagore
C. Subhas Chandra Bose
D. Sarojini Naidu
Correct Answer: B
Explanation: Rabindranath Tagore composed “Jana Gana Mana,” which reflects India’s unity and diversity. The song was formally adopted as the national anthem in 1950. Tagore’s contributions to literature, music, and education made him one of India’s most respected cultural figures and India’s first Nobel Prize winner in Literature.
6. What is the SI unit of force?
A. Joule
B. Newton
C. Watt
D. Pascal
Correct Answer: B
Explanation: The Newton is the SI unit of force, named after Sir Isaac Newton. It represents the force required to accelerate a 1-kg mass at 1 meter per second squared. Force, mass, and acceleration are core concepts in physics and help explain how objects move and interact in the physical world.
7. In which year did India gain independence?
A. 1942
B. 1945
C. 1947
D. 1950
Correct Answer: C
Explanation: India became independent from British rule on 15 August 1947 after decades of struggle led by leaders such as Gandhi, Nehru, Patel, and others. This day marks the end of colonial oppression and the beginning of a sovereign nation, celebrated annually as Independence Day with national pride.
8. Which planet is known as the Red Planet?
A. Earth
B. Mars
C. Venus
D. Jupiter
Correct Answer: B
Explanation: Mars appears red because its surface contains iron oxide, or rust, giving it a reddish color. It has long fascinated scientists due to its resemblance to Earth and potential for past water. Mars missions aim to understand its climate, geological history, and the possibility of life beyond Earth.
9. Which of the following is a non-renewable resource?
A. Solar energy
B. Wind energy
C. Coal
D. Hydro energy
Correct Answer: C
Explanation: Coal is a non-renewable fossil fuel formed over millions of years from plant remains. Once used, it cannot be replenished within a human timescale. Renewable resources like solar, wind, and hydro regenerate naturally. Overuse of coal leads to pollution, environmental damage, and contributes significantly to climate change.
10. What is the currency of Japan?
A. Dollar
B. Euro
C. Yen
D. Rupee
Correct Answer: C
Explanation: The Japanese Yen (¥) is Japan’s official currency and is among the most widely traded currencies in global financial markets. It plays a major role in international trade, investment, and forex exchanges. Understanding major global currencies helps improve general awareness for competitive exams.
11. Which vitamin is known as Ascorbic Acid?
A. Vitamin A
B. Vitamin B12
C. Vitamin C
D. Vitamin D
Correct Answer: C
Explanation: Vitamin C, also called Ascorbic Acid, is essential for boosting immunity, repairing body tissues, and maintaining skin health. It acts as an antioxidant, protecting the body from harmful free radicals. Citrus fruits like oranges and lemons are rich sources of Vitamin C, preventing diseases like scurvy.
12. Who discovered the law of gravity?
A. Albert Einstein
B. Isaac Newton
C. Galileo Galilei
D. Marie Curie
Correct Answer: B
Explanation: Sir Isaac Newton formulated the law of gravity after observing an apple falling from a tree. His theory explained how objects attract each other with a force proportional to their masses and inversely proportional to the distance between them. This discovery laid the foundation of classical physics.
13. What is the chemical formula of water?
A. CO₂
B. H₂O
C. NaCl
D. O₂
Correct Answer: B
Explanation: Water is composed of two hydrogen atoms and one oxygen atom, giving it the formula H₂O. This simple molecule is essential for life and plays a key role in biological, chemical, and environmental processes. Water’s unique properties make it indispensable for living organisms and ecosystems.
14. Which is the largest organ of the human body?
A. Liver
B. Brain
C. Skin
D. Heart
Correct Answer: C
Explanation: The skin is the largest organ, covering the entire body and protecting internal organs from injury, infection, and dehydration. It regulates temperature, allows sensation, and removes toxins through sweat. Its multi-layered structure makes it crucial for maintaining overall health and responding to environmental changes.
15. Who was the first President of India?
A. S. Radhakrishnan
B. Rajendra Prasad
C. Zakir Hussain
D. V. V. Giri
Correct Answer: B
Explanation: Dr. Rajendra Prasad served as India’s first President, holding office from 1950 to 1962. A respected freedom fighter and scholar, he played an important role in India’s Constituent Assembly. His leadership and integrity contributed significantly to building the foundations of independent India’s democratic system.
16. Which among the following is a prime number?
A. 15
B. 21
C. 29
D. 35
Correct Answer: C
Explanation: A prime number has exactly two distinct factors: 1 and itself. The number 29 is divisible only by 1 and 29, making it a prime number. The other options—15, 21, and 35—are composite, meaning they have more than two factors and can be divided by multiple numbers.
17. What is the freezing point of water?
A. 0°C
B. 10°C
C. 20°C
D. 32°C
Correct Answer: A
Explanation: Under normal atmospheric pressure, water freezes at 0°C, changing from liquid to solid. This physical property is widely used in scientific measurements and weather predictions. Freezing point variations occur under different pressures or with impurities, but 0°C remains the standard reference temperature.
18. Which is the smallest continent in the world?
A. Europe
B. Australia
C. Antarctica
D. South America
Correct Answer: B
Explanation: Australia is the smallest continent by land area but is also a fully developed nation with diverse landscapes. It is surrounded by water and often referred to as an island continent. Despite its size, it has rich biodiversity and unique wildlife found nowhere else in the world.
19. Who invented the telephone?
A. Graham Bell
B. Thomas Edison
C. Nikola Tesla
D. James Watt
Correct Answer: A
Explanation: Alexander Graham Bell invented the telephone in 1876, revolutionizing communication. His invention allowed voice transmission over long distances and laid the foundation for modern telecommunication systems. Bell’s work changed how people interacted worldwide, making communication faster and more convenient.
20. What is the capital of India?
A. Kolkata
B. Mumbai
C. New Delhi
D. Chennai
Correct Answer: C
Explanation: New Delhi is the capital city of India and serves as the seat of all three branches of government—executive, legislative, and judiciary. It hosts important national institutions, embassies, and cultural landmarks. The city symbolizes India’s political identity and democratic governance.
21. Which blood group is known as the universal donor?
A. AB+
B. O+
C. O−
D. AB−
Correct Answer: C
Explanation: O-negative blood can be given to individuals of any other blood group, making it the universal donor. This is crucial during emergencies when a patient’s blood type is unknown. Although O-negative individuals can donate to all, they can receive blood only from the same group.
22. Which planet is closest to the Sun?
A. Earth
B. Mars
C. Venus
D. Mercury
Correct Answer: D
Explanation: Mercury is the closest planet to the Sun, completing an orbit in just 88 Earth days. Its proximity makes it extremely hot during the day and very cold at night. Studying Mercury helps scientists understand planetary formation and the impact of solar radiation.
23. Which instrument is used to measure temperature?
A. Barometer
B. Thermometer
C. Hygrometer
D. Altimeter
Correct Answer: B
Explanation: A thermometer measures temperature using substances like mercury or alcohol that expand with heat. Digital thermometers use sensors to detect temperature changes. They are used in weather stations, medical examinations, laboratories, and households, making them essential tools for daily life and scientific research.
24. Which organ purifies blood in the human body?
A. Heart
B. Lungs
C. Kidneys
D. Stomach
Correct Answer: C
Explanation: Kidneys filter waste products, toxins, and excess fluid from the blood, producing urine. They help maintain electrolyte balance, regulate blood pressure, and support overall health. Proper kidney function is vital for removing harmful substances and keeping the body’s internal environment stable and clean.
25. Which of the following is a non-metal?
A. Copper
B. Iron
C. Sulphur
D. Aluminum
Correct Answer: C
Explanation: Sulphur is a non-metal known for its bright yellow color and distinctive smell in compounds. It is used in fertilizers, chemicals, and medicines. Non-metals differ from metals by lacking shine, being poor conductors, and often existing in gaseous or brittle solid states.
26. Who wrote “Ramayana”?
A. Valmiki
B. Tulsidas
C. Ved Vyas
D. Kalidas
Correct Answer: A
Explanation: The ancient sage Valmiki wrote the original Sanskrit version of the Ramayana. It narrates the life of Lord Rama, his exile, Sita’s abduction, and the battle with Ravana. The Ramayana is considered one of India’s greatest epics and holds deep cultural and spiritual significance.
27. Which substance is attracted by a magnet?
A. Plastic
B. Copper
C. Iron
D. Wood
Correct Answer: C
Explanation: Iron is strongly attracted by magnets due to its ferromagnetic properties. Magnets align iron atoms in the same direction, producing a magnetic effect. This property makes iron useful in tools, machinery, and electromagnetic devices such as motors, transformers, and generators.
28. What is the full form of ATM?
A. Any Time Money
B. Automated Teller Machine
C. Automatic Transfer Machine
D. Auto Transaction Method
Correct Answer: B
Explanation: ATM stands for Automated Teller Machine, a device that allows customers to withdraw cash, check balances, and perform banking tasks without visiting a bank branch. It enhances convenience and reduces workload on bank staff. ATMs operate 24/7, making financial services easily accessible.
29. Which of the following is an input device?
A. Monitor
B. Keyboard
C. Printer
D. Speaker
Correct Answer: B
Explanation: A keyboard is an input device used to enter data, commands, and text into a computer. It is essential for typing, programming, and navigating. Other options like monitors and printers are output devices because they display or produce information rather than provide input.
30. What is HCl commonly known as?
A. Nitric acid
B. Sulfuric acid
C. Hydrochloric acid
D. Acetic acid
Correct Answer: C
Explanation: HCl refers to Hydrochloric Acid, a strong acid used in industries and also found in the human stomach. It helps in digestion by breaking down food and killing harmful bacteria. Its industrial uses include cleaning metals and producing chemicals.
31. Which gas is used in balloons?
A. Nitrogen
B. Oxygen
C. Helium
D. Carbon dioxide
Correct Answer: C
Explanation: Helium is used in balloons because it is lighter than air and non-flammable. Unlike hydrogen, which is highly explosive, helium is safe and stable. Its low density allows balloons to float, making helium ideal for decorations, scientific instruments, and weather balloons.
32. The process of converting water vapor into liquid is called?
A. Evaporation
B. Condensation
C. Sublimation
D. Fusion
Correct Answer: B
Explanation: Condensation occurs when water vapor cools and turns into liquid droplets. This process forms clouds, dew, and fog. It plays a crucial role in the water cycle, helping return moisture from the atmosphere to Earth’s surface as rain.
33. Which is the hardest natural substance?
A. Gold
B. Iron
C. Diamond
D. Silver
Correct Answer: C
Explanation: Diamond is the hardest naturally occurring substance due to its tightly packed carbon atoms arranged in a crystal structure. It is used in cutting tools, drilling machines, and jewelry. Its unmatched hardness makes it extremely durable and useful in industrial applications.
34. Who founded the Arya Samaj?
A. Dayanand Saraswati
B. Guru Nanak
C. Raja Ram Mohan Roy
D. Vivekananda
Correct Answer: A
Explanation: Swami Dayanand Saraswati founded the Arya Samaj in 1875 to reform Indian society by promoting Vedic principles. He emphasized education, equality, and opposition to social evils like caste discrimination. Arya Samaj played a significant role in India’s social and cultural reform movements.
35. Which device is used to measure pressure?
A. Thermometer
B. Barometer
C. Ammeter
D. Calorimeter
Correct Answer: B
Explanation: A barometer measures atmospheric pressure, which helps forecast weather. It works by balancing the weight of mercury or using sensors in digital models. Atmospheric pressure is important for aviation, meteorology, and climate studies, making barometers essential tools for scientific research and forecasting.
36. Which state is known as the ‘Land of Five Rivers’?
A. Haryana
B. Punjab
C. Rajasthan
D. Bihar
Correct Answer: B
Explanation: Punjab means “Land of Five Rivers,” referring to the rivers Beas, Ravi, Sutlej, Chenab, and Jhelum. These rivers contributed to the region’s fertility, making Punjab a major agricultural hub. Its rich culture, history, and agriculture make it one of India’s most prosperous states.
37. What is the value of π (Pi)?
A. 2.14
B. 3.14
C. 4.14
D. 5.14
Correct Answer: B
Explanation: Pi is approximately 3.14, representing the ratio of a circle’s circumference to its diameter. It is an irrational number used in geometry, trigonometry, physics, and engineering. Pi helps calculate areas, volumes, and curved surfaces, making it fundamental to mathematical and scientific calculations.
38. Who discovered electricity?
A. Benjamin Franklin
B. Isaac Newton
C. Thomas Edison
D. Galileo
Correct Answer: A
Explanation: Benjamin Franklin’s famous kite experiment helped demonstrate the electrical nature of lightning. His work laid the foundation for understanding electricity. Although many scientists later contributed to electrical technology, Franklin’s experiments were among the first to reveal key principles of electrical behavior.
39. Which is the largest planet in the Solar System?
A. Earth
B. Jupiter
C. Saturn
D. Neptune
Correct Answer: B
Explanation: Jupiter is the largest planet, with a diameter nearly 11 times that of Earth. It is a gas giant composed mainly of hydrogen and helium. Its immense size, strong magnetic field, and dozens of moons make it an important subject of astronomical study.
40. Which element is essential for photosynthesis?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Hydrogen
Correct Answer: C
Explanation: Plants use carbon dioxide during photosynthesis to produce glucose and oxygen with the help of sunlight and chlorophyll. This process sustains plant growth and releases oxygen into the atmosphere. Carbon dioxide is essential for maintaining the global carbon cycle and supporting life on Earth.
41. What is the square root of 144?
A. 10
B. 11
C. 12
D. 14
Correct Answer: C
Explanation: 144 is a perfect square, and its square root is 12. Square roots help simplify mathematical calculations and appear in geometry, algebra, and trigonometry. Understanding square numbers improves accuracy in exams and strengthens mathematical problem-solving skills.
42. What is the capital of Karnataka?
A. Mysuru
B. Mangaluru
C. Bengaluru
D. Belagavi
Correct Answer: C
Explanation: Bengaluru, also called the Silicon Valley of India, is the capital of Karnataka. It is known for its IT industry, startups, pleasant weather, and educational institutions. Bengaluru is an important economic and technological hub, contributing significantly to India’s digital growth.
43. The largest desert in the world is?
A. Gobi Desert
B. Kalahari Desert
C. Thar Desert
D. Sahara Desert
Correct Answer: D
Explanation: The Sahara Desert in Africa is the world’s largest hot desert, covering vast areas across multiple countries. Its extreme temperatures and dry conditions make it a unique ecosystem. The desert plays an important role in climate patterns and is known for its massive dunes and ancient rock formations.
44. What is the heaviest naturally occurring element?
A. Uranium
B. Gold
C. Lead
D. Silver
Correct Answer: A
Explanation: Uranium is the heaviest naturally occurring element, widely used as fuel in nuclear reactors. It has powerful radioactive properties and plays a major role in energy production and scientific research. Understanding uranium is important for studying nuclear physics and energy systems.
45. Which river is the longest in India?
A. Ganga
B. Yamuna
C. Godavari
D. Brahmaputra
Correct Answer: A
Explanation: The Ganga is India’s longest river, flowing through several states and supporting millions of people. It holds religious, cultural, and economic significance. The river’s basin is one of the most fertile regions, contributing heavily to agriculture and livelihood.
46. Which nutrient is responsible for body growth?
A. Carbohydrates
B. Proteins
C. Fats
D. Vitamins
Correct Answer: B
Explanation: Proteins are essential for building and repairing tissues, muscles, and hormones. They support growth, immunity, and overall development. Foods like pulses, eggs, and meat are rich in protein. Protein deficiency can lead to stunted growth and weakened immunity, making it crucial for health.
47. Which country gifted the Statue of Liberty to the USA?
A. Germany
B. Spain
C. France
D. Canada
Correct Answer: C
Explanation: France gifted the Statue of Liberty to the United States in 1886 as a symbol of friendship and democracy. The statue represents freedom and welcomes immigrants arriving in America. It is one of the world’s most recognizable landmarks and an important historical monument.
48. Which is the nearest star to Earth?
A. Proxima Centauri
B. Sun
C. Sirius
D. Polaris
Correct Answer: B
Explanation: The Sun is the nearest star to Earth and the primary source of light and heat for our planet. It drives weather, climate, and supports life through photosynthesis. Other stars are extremely far away, making the Sun uniquely important in our solar system.
49. Which device is used to see distant objects?
A. Microscope
B. Telescope
C. Magnifying glass
D. Spectacles
Correct Answer: B
Explanation: A telescope magnifies distant objects using lenses or mirrors. It allows astronomers to observe stars, planets, comets, and galaxies. Telescopes have greatly expanded our understanding of the universe, from planetary movement to the discovery of new celestial bodies.
50. Which gas do plants release during photosynthesis?
A. Nitrogen
B. Carbon dioxide
C. Oxygen
D. Hydrogen
Correct Answer: C
Explanation: During photosynthesis, plants take in carbon dioxide and release oxygen as a byproduct. This oxygen is essential for humans and animals. The process helps maintain atmospheric balance and supports life on Earth. Understanding photosynthesis is key to learning how ecosystems function and sustain life.
Conclusion
These 50 RRB Group D MCQs with answers and explanations cover essential topics you’ll face in the exam. Consistent practice will sharpen your accuracy and confidence. Use these questions to revise quickly and strengthen your fundamentals. With regular preparation and smart strategy, cracking RRB Group D becomes much easier.