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Scientists & Nobel Laureates — Homi Bhabha Class 9 General Knowledge MCQs with Solutions
Free Homi Bhabha Class 9 General Knowledge Scientists & Nobel Laureates MCQs with step-by-step solutions covering Famous Scientists & Discoveries, Nobel Prize Winners in Science. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — Famous Scientists & Discoveries · easy · theory
The first electric battery, the voltaic pile, was invented by:
A. Alessandro Volta ✓ Correct
B. Andre-Marie Ampere
C. Charles Coulomb
D. Georg Ohm
Solution: Alessandro Volta built the first electric battery, the voltaic pile, in 1800.
Q2 — Famous Scientists & Discoveries · easy · theory
The neutron, the neutral particle found inside the atomic nucleus, was discovered by:
A. J. J. Thomson
B. Ernest Rutherford
C. Niels Bohr
D. James Chadwick ✓ Correct
Solution: James Chadwick discovered the neutron in 1932.
Q3 — Famous Scientists & Discoveries · easy · theory
X-rays, used today to photograph broken bones, were discovered by:
A. Wilhelm Roentgen ✓ Correct
B. Max Planck
C. Henri Becquerel
D. Marie Curie
Solution: Wilhelm Roentgen discovered X-rays in 1895.
Q4 — Famous Scientists & Discoveries · easy · theory
The modern atomic theory, stating that all matter is made of tiny atoms, was proposed by:
A. J. J. Thomson
B. Niels Bohr
C. John Dalton ✓ Correct
D. Democritus
Solution: John Dalton gave the modern atomic theory; Democritus only had an early philosophical idea of atoms.
Q5 — Nobel Prize Winners in Science · easy · theory
Wilhelm Roentgen received the very first Nobel Prize in Physics, in 1901, for discovering:
A. the electron
B. X-rays ✓ Correct
C. radio waves
D. radioactivity
Solution: Wilhelm Roentgen won the first-ever Physics Nobel in 1901 for the discovery of X-rays.
Q6 — Nobel Prize Winners in Science · easy · theory
Guglielmo Marconi shared the Nobel Prize in Physics for developing:
A. television
B. the telephone
C. wireless telegraphy (radio) ✓ Correct
D. the electric bulb
Solution: Marconi shared the 1909 Physics Nobel for developing wireless telegraphy, or radio.
Q7 — Nobel Prize Winners in Science · easy · theory
The science Nobel Prizes are presented every year on 10 December because that date is the anniversary of:
A. the invention of dynamite
B. the first Nobel Prize
C. the birth of Alfred Nobel
D. the death of Alfred Nobel ✓ Correct
Solution: The prizes are handed over on 10 December, the anniversary of the death of Alfred Nobel in 1896.
Q8 — Famous Scientists & Discoveries · hard · theory
The theory of evolution by natural selection was proposed by:
A. Charles Darwin ✓ Correct
B. Louis Pasteur
C. Gregor Mendel
D. Robert Hooke
Solution: Charles Darwin explained evolution through natural selection in "On the Origin of Species".
Q9 — Famous Scientists & Discoveries · hard · theory
The nucleus of the atom was discovered by:
A. Niels Bohr
B. John Dalton
C. J. J. Thomson
D. Ernest Rutherford ✓ Correct
Solution: Rutherford's gold-foil experiment revealed the tiny, dense, positive nucleus.
Q10 — Famous Scientists & Discoveries · hard · theory
The first successful vaccine (against smallpox) was developed by:
A. Alexander Fleming
B. Edward Jenner ✓ Correct
C. Jonas Salk
D. Louis Pasteur
Solution: Edward Jenner developed the smallpox vaccine in 1796.
Q11 — Famous Scientists & Discoveries · hard · theory
The phenomenon of electromagnetic induction (basis of generators) was discovered by:
A. Isaac Newton
B. Michael Faraday ✓ Correct
C. Alessandro Volta
D. Georg Ohm
Solution: Michael Faraday discovered electromagnetic induction in 1831.
Q12 — Famous Scientists & Discoveries · hard · theory
The principle of buoyancy ("a body immersed in a fluid is buoyed up...") was given by:
A. Pascal
B. Newton
C. Aristotle
D. Archimedes ✓ Correct
Solution: Archimedes' principle describes the upthrust on a body immersed in a fluid.
Q13 — Famous Scientists & Discoveries · hard · theory
The scientist who greatly advanced the study of radioactivity and discovered radium was:
A. Michael Faraday
B. Charles Darwin
C. Marie Curie ✓ Correct
D. Isaac Newton
Solution: Marie Curie pioneered research on radioactivity and discovered radium and polonium.
Q14 — Famous Scientists & Discoveries · hard · theory
Galileo Galilei is famous for improving the telescope and for supporting the idea that:
A. the Earth is flat
B. the Sun revolves around the Earth
C. the Moon produces its own light
D. the Earth revolves around the Sun ✓ Correct
Solution: Galileo supported the heliocentric (Sun-centred) model using telescopic observations.
Q15 — Nobel Prize Winners in Science · hard · theory
C. V. Raman received the Nobel Prize in Physics for his work on the:
A. structure of DNA
B. photoelectric effect
C. theory of relativity
D. scattering of light (the Raman Effect) ✓ Correct
Solution: The Raman Effect describes the scattering of light by molecules.
Q16 — Nobel Prize Winners in Science · hard · theory
The only person to win a Nobel Prize in two different sciences (Physics and Chemistry) was:
A. Marie Curie ✓ Correct
B. Isaac Newton
C. Albert Einstein
D. C. V. Raman
Solution: Marie Curie won the Nobel Prize in Physics (1903) and Chemistry (1911).
Q17 — Nobel Prize Winners in Science · hard · theory
Albert Einstein was awarded the Nobel Prize in Physics for his explanation of the:
A. photoelectric effect ✓ Correct
B. theory of relativity
C. Raman effect
D. law of gravitation
Solution: Einstein received the 1921 Nobel Prize for explaining the photoelectric effect, not relativity.
Q18 — Nobel Prize Winners in Science · hard · theory
There is NO Nobel Prize awarded in the field of:
A. Mathematics ✓ Correct
B. Chemistry
C. Medicine
D. Physics
Solution: Nobel Prizes are not awarded in Mathematics.
Q19 — Nobel Prize Winners in Science · hard · theory
Har Gobind Khorana, of Indian origin, won the Nobel Prize (in Medicine) for his work on the:
A. periodic table
B. structure of the atom
C. genetic code ✓ Correct
D. theory of relativity
Solution: Khorana shared the 1968 Nobel Prize for interpreting the genetic code.
Q20 — Nobel Prize Winners in Science · hard · theory
The Indian-born astrophysicist who won the Nobel Prize in Physics for his study of stars was:
A. J. C. Bose
B. Satyendra Nath Bose
C. C. V. Raman
D. S. Chandrasekhar ✓ Correct
Solution: Subrahmanyan Chandrasekhar won the 1983 Physics Nobel for his work on stellar structure.
Q21 — Nobel Prize Winners in Science · hard · theory
Venkatraman Ramakrishnan, of Indian origin, won the Nobel Prize in Chemistry for studies of the:
A. galaxy
B. ribosome ✓ Correct
C. atom
D. genome only
Solution: He shared the 2009 Chemistry Nobel for research on the structure of the ribosome.
Q22 — Nobel Prize Winners in Science · hard · theory
Watson, Crick and Wilkins received the Nobel Prize for discovering the structure of:
A. the cell
B. the atom
C. DNA ✓ Correct
D. proteins only
Solution: They shared the 1962 Nobel Prize for describing the double-helix structure of DNA.
Q23 — Nobel Prize Winners in Science · hard · theory
Ernest Rutherford, often called the "father of nuclear physics", actually received his Nobel Prize in:
A. Medicine
B. Physics
C. Chemistry ✓ Correct
D. Peace
Solution: Rutherford won the 1908 Nobel Prize in Chemistry for his work on radioactivity.
Q24 — Famous Scientists & Discoveries · hard · theory
The scientist who found that a current-carrying wire deflects a nearby magnetic compass needle, thereby linking electricity and magnetism, was:
A. Michael Faraday
B. Georg Ohm
C. Hans Christian Oersted ✓ Correct
D. Andre-Marie Ampere
Solution: Hans Christian Oersted showed in 1820 that an electric current deflects a compass needle, connecting electricity and magnetism.
Q25 — Famous Scientists & Discoveries · hard · theory
The law stating that the current through a conductor is directly proportional to the voltage across it (V = I × R) was given by:
A. Alessandro Volta
B. Andre-Marie Ampere
C. Georg Ohm ✓ Correct
D. James Joule
Solution: Ohm gave the law V = I × R relating voltage, current and resistance.
Q26 — Famous Scientists & Discoveries · hard · theory
Two students argue about who first proposed that the Sun, not the Earth, is at the centre of the solar system. The astronomer who first proposed this heliocentric model, long before Galileo defended it, was:
A. Johannes Kepler
B. Galileo Galilei
C. Nicolaus Copernicus ✓ Correct
D. Isaac Newton
Solution: Nicolaus Copernicus first proposed the Sun-centred model; Galileo later defended it using his telescope.
Q27 — Nobel Prize Winners in Science · hard · theory
John Bardeen is unique for winning the Nobel Prize twice in the SAME science subject, namely:
A. Medicine
B. Chemistry
C. Physics ✓ Correct
D. both Physics and Chemistry
Solution: John Bardeen won the Physics Nobel twice, in 1956 and 1972; winning in two different sciences describes Marie Curie, not him.
Q28 — Nobel Prize Winners in Science · hard · theory
Linus Pauling is unusual for winning two Nobel Prizes in two very different areas, one in Chemistry and the other for:
A. Literature
B. Physics
C. Peace ✓ Correct
D. Medicine
Solution: Linus Pauling won the Chemistry Nobel in 1954 and the Nobel Peace Prize in 1962.
Q29 — Nobel Prize Winners in Science · hard · theory
A Nobel Prize in a science can be shared by at most three people. If a discovery is made by a team of five equally important scientists, then:
A. at most three of them can share the prize ✓ Correct
B. none of them can receive it
C. the prize is cancelled that year
D. all five must share it equally
Solution: By the rules, a single science Nobel Prize can be shared by no more than three people in a year, so at most three of the five could share it.
Q30 — Famous Scientists & Discoveries · medium · theory
The laws of motion and the law of universal gravitation were given by:
A. Albert Einstein
B. Michael Faraday
C. Isaac Newton ✓ Correct
D. Galileo Galilei
Solution: Sir Isaac Newton formulated the three laws of motion and the law of gravitation.