Science & Technology MCQ Questions 2026 – Topic-wise Practice for SSC, Railways, UPSC

The human body has how many pairs of chromosomes?

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💡 Explanation

The human body has 23 pairs of chromosomes (46 total in each cell). The 23rd pair determines biological sex (XX for female, XY for male).

ISRO's Chandrayaan-3 successfully landed on the Moon in:

July 2023

August 2023

September 2023

October 2023

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💡 Explanation

ISRO's Chandrayaan-3 Vikram lander successfully touched down near the Moon's south pole on 23 August 2023, making India the 4th country to achieve a soft lunar landing.

Which scientist is credited with the discovery of the theory of evolution through natural selection?

Charles Darwin

Galileo Galilei

Isaac Newton

Albert Einstein

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💡 Explanation

Charles Darwin is credited with the discovery of the theory of evolution through natural selection, which he published in his book 'On the Origin of Species' in 1859.

Which scientist is credited with the discovery of the X-ray?

Wilhelm Conrad Rontgen

Marie Curie

Pierre Curie

Henri Becquerel

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💡 Explanation

Wilhelm Conrad Rontgen is credited with the discovery of the X-ray in 1895, for which he was awarded the first Nobel Prize in Physics in 1901.

Which scientist is credited with the discovery of the polio vaccine?

Jonas Salk

Albert Sabin

Edward Jenner

Louis Pasteur

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💡 Explanation

Jonas Salk is credited with the discovery of the inactivated polio vaccine, which was first introduced in 1955 and has since been used to nearly eradicate polio worldwide.

Which scientist is credited with the discovery of the structure of DNA?

James Watson and Francis Crick

Rosalind Franklin and Maurice Wilkins

Linus Pauling and Robert Corey

Erwin Chargaff and Marshall Nirenberg

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💡 Explanation

James Watson and Francis Crick are credited with the discovery of the structure of DNA in 1953, using X-ray crystallography data provided by Rosalind Franklin and Maurice Wilkins.