General Science Questions for RRB NTPC Graduate and UG Exam 2026

The RRB NTPC Exam 2026 is one of the most competitive railway recruitment examinations conducted by the Railway Recruitment Board. As per the latest updates, the RRB NTPC Exam Date 2026 has been set from 16th to 17th March. In this article, candidates can find General Science Questions for RRB NTPC Graduate and UG Exam 2026, which will help them practice important concepts and improve their performance in the upcoming examination. Read here for more details.

General Science Questions for RRB NTPC Graduate and UG Exam 2026

The General Science section in the RRB NTPC exam tests candidates’ knowledge of the fundamentals of General Science and its practical applications. Questions are asked on various topics such as the human body, motion, electricity, chemical reactions, atoms, environment, plants, diseases, and basic physics laws. Below, we will provide important General Science questions for the RRB NTPC Graduate and UG Exam 2026 that are frequently asked in railway examinations, along with solutions:

Q1. Why did Mendeleev leave gaps in his periodic table?

A. For undiscovered elements
B. To include isotopes
C. To avoid repetition of elements
D. To make the table symmetrical

Answer: A. For undiscovered elements

Solution:
Russian chemist Dmitri Mendeleev arranged elements by increasing atomic mass. Some elements did not fit the pattern, so he intentionally left empty spaces. He predicted that new elements would later fill these gaps. Later discoveries such as gallium and germanium confirmed his predictions.

Q2. What is the relation between the frequency (f) and time period (T) of a sound wave?

A. f = T
B. f = 1/T
C. f = T/2
D. f = 2T

Answer: B. f = 1/T

Solution:

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Q3. The mention of DNA as a long polymer of deoxyribonucleotides implies which structural characteristic?

A. Sugar-phosphate backbone and nitrogenous bases
B. Hydrogen bonds in a parallel chain
C. Circular sequence
D. Multiple short independent chains

Answer: A. Sugar-phosphate backbone and nitrogenous bases

Solution:
DNA is made of repeating nucleotide units containing a sugar, phosphate, and nitrogenous base. These form the backbone and internal base pairs.
The double helix structure of DNA was discovered by James Watson and Francis Crick in 1953.

Q4. Which principle states that each point on a wavefront acts as a source of secondary wavelets?

A. Doppler’s Principle
B. Superposition Principle
C. Huygens’ Principle
D. Fermat’s Principle

Answer: C. Huygens’ Principle

Solution:
According to Christiaan Huygens, every point on a wavefront behaves like a source of new wavelets. The new wavefront is formed by the envelope of these wavelets.

Q5. What is the relation between speed of sound (v), wavelength (λ) and time period (T)?

A. v = λ × T
B. v = λ / T
C. v = T / λ
D. v = λ + T

Answer: B. v = λ / T

Q6. Which blood cells help in clotting?

A. RBC
B. WBC
C. Platelets
D. Plasma

Answer: C. Platelets

Solution:
Platelets help in blood clotting by forming a plug at the site of injury to stop bleeding.

Q7. Which gas is responsible for global warming the most?

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

Answer: B. Carbon dioxide

Solution:
Carbon dioxide is the primary greenhouse gas contributing to global warming by trapping heat in Earth’s atmosphere.

Q8. What is the SI unit of electric current?

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

Answer: B. Ampere

Solution:
The SI unit of electric current is the Ampere, named after André‑Marie Ampère.

Q9. Which vitamin is obtained from sunlight?

A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D

Answer: D. Vitamin D

Solution:
Sunlight helps the skin synthesize Vitamin D, which is essential for calcium absorption and bone health.

Q10. Which organ purifies blood in the human body?

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

Answer: C. Kidney

Solution:
Kidneys filter waste products and excess water from blood to form urine.

Q11. What is the chemical formula of common salt?

A. KCl
B. NaCl
C. CaCl₂
D. MgCl₂

Answer: B. NaCl

Solution:
Common salt is sodium chloride, composed of sodium and chlorine ions.

Q12. Which metal is liquid at room temperature?

A. Mercury
B. Iron
C. Copper
D. Silver

Answer: A. Mercury

Solution:
Mercury is the only metal that remains liquid at room temperature.

Q13. What is the main source of energy for Earth?

A. Moon
B. Sun
C. Wind
D. Water

Answer: B. Sun

Solution:
The Sun is the primary source of energy for Earth, driving climate, weather, and photosynthesis.

Q14. Which gas is used in photosynthesis?

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

Answer: B. Carbon dioxide

Solution:
Plants use carbon dioxide, water, and sunlight to produce glucose and oxygen during photosynthesis.

Q15. Which scientist discovered gravity?

A. Newton
B. Galileo
C. Einstein
D. Faraday

Answer: A. Newton

Solution:
The law of gravity was formulated by Isaac Newton.

Q16. What type of energy is stored in food?

A. Kinetic energy
B. Chemical energy
C. Mechanical energy
D. Heat energy

Answer: B. Chemical energy

Solution:
Food stores chemical energy which the body converts into usable energy.

Q17. Which part of plant performs photosynthesis?

A. Root
B. Stem
C. Leaf
D. Flower

Answer: C. Leaf

Solution:
Leaves contain chlorophyll which captures sunlight for photosynthesis.

Q18. What is the boiling point of water at sea level?

A. 90°C
B. 100°C
C. 80°C
D. 120°C

Answer: B. 100°C

Solution:
Water boils at 100°C at standard atmospheric pressure.

Q19. Which instrument measures temperature?

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

Answer: B. Thermometer

Solution:
A thermometer measures temperature of substances.

Q20. Which gas do humans inhale for respiration?

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

Answer: C. Oxygen

Solution:
Humans inhale oxygen which is used in cellular respiration to produce energy.

Q21. What is the smallest unit of life?

A. Atom
B. Molecule
C. Cell
D. Tissue

Answer: C. Cell

Solution:
Cells are the basic structural and functional units of living organisms.

Q22. Which planet is known as the Red Planet?

A. Venus
B. Mars
C. Jupiter
D. Mercury

Answer: B. Mars

Solution:
Mars appears red because of iron oxide (rust) on its surface.

Q23. Which gas is most abundant in Earth’s atmosphere?

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

Answer: C. Nitrogen

Solution:
Nitrogen makes up about 78% of Earth’s atmosphere.

Q24. What type of lens is used in a magnifying glass?

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

Answer: B. Convex lens

Solution:
A convex lens converges light rays and magnifies nearby objects.

Q25. Which organ controls the human body?

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

Answer: B. Brain

Solution:
The brain controls body functions through the nervous system.

Download PDFs for General Science Questions for RRB NTPC Graduate and UG Exam 2026

Candidates preparing for the RRB NTPC 2026 exam can download the General Science Questions for RRB NTPC Graduate and UG Exam 2026 in PDF format, in English as well as Hindi, along with details solutions.

General Science Questions for RRB NTPC Graduate and UG Exam 2026 PDF Link (English) 

General Science Questions for RRB NTPC Graduate and UG Exam 2026 PDF Link (Hindi)