50 Science GK for All.

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 Here are multiple-choice questions (MCQs) with answers based on the provided science general knowledge questions:

1. What is the chemical symbol for water?
   a) H
   b) O
   c) H2O
   d) HO
   **Answer: c) H2O**

2. Who is known as the father of modern physics?
   a) Isaac Newton
   b) Albert Einstein
   c) Galileo Galilei
   d) Nikola Tesla
   **Answer: b) Albert Einstein**

3. What is the largest organ in the human body?
   a) Liver
   b) Skin
   c) Brain
   d) Heart
   **Answer: b) Skin**

4. What is the chemical formula for table salt?
   a) Na
   b) NaCl
   c) HCl
   d) H2O
   **Answer: b) NaCl**

5. What is the unit of measurement for force?
   a) Joule
   b) Watt
   c) Newton
   d) Ampere
   **Answer: c) Newton**

6. Who discovered penicillin?
   a) Alexander Fleming
   b) Louis Pasteur
   c) Marie Curie
   d) Robert Koch
   **Answer: a) Alexander Fleming**

7. What is the hardest natural substance on Earth?
   a) Diamond
   b) Graphite
   c) Quartz
   d) Tungsten
   **Answer: a) Diamond**

8. What is the study of earthquakes called?
   a) Seismology
   b) Volcanology
   c) Geology
   d) Climatology
   **Answer: a) Seismology**

9. What is the process by which plants make their food called?
   a) Photosynthesis
   b) Respiration
   c) Transpiration
   d) Fermentation
   **Answer: a) Photosynthesis**

10. What is the chemical symbol for gold?
    a) Au
    b) Ag
    c) Fe
    d) Cu
    **Answer: a) Au**

11. Who proposed the theory of relativity?
    a) Isaac Newton
    b) Albert Einstein
    c) Galileo Galilei
    d) Max Planck
    **Answer: b) Albert Einstein**

12. What is the closest planet to the Sun?
    a) Venus
    b) Mars
    c) Mercury
    d) Earth
    **Answer: c) Mercury**

13. What is the study of fossils called?
    a) Paleontology
    b) Archaeology
    c) Geology
    d) Anthropology
    **Answer: a) Paleontology**

14. What is the largest bone in the human body?
    a) Femur
    b) Tibia
    c) Humerus
    d) Radius
    **Answer: a) Femur**

15. What is the chemical formula for oxygen?
    a) O2
    b) CO2
    c) H2O
    d) N2
    **Answer: a) O2**

16. What causes tides in the oceans?
    a) Gravitational force of the Moon
    b) Gravitational force of the Sun
    c) Wind patterns
    d) Earth's rotation
    **Answer: a) Gravitational force of the Moon**

17. Who is known as the father of genetics?
    a) Charles Darwin
    b) Gregor Mendel
    c) Thomas Edison
    d) Louis Pasteur
    **Answer: b) Gregor Mendel**

18. What is the process of a liquid turning into a gas called?
    a) Condensation
    b) Evaporation
    c) Sublimation
    d) Melting
    **Answer: b) Evaporation**

19. What is the main component of the Earth's atmosphere?
    a) Nitrogen
    b) Oxygen
    c) Carbon dioxide
    d) Hydrogen
    **Answer: a) Nitrogen**

20. What is the chemical formula for carbon dioxide?
    a) CO
    b) CO2
    c) CH4
    d) C6H12O6
    **Answer: b) CO2**

21. Who discovered the law of gravity?
    a) Isaac Newton
    b) Albert Einstein
    c) Galileo Galilei
    d) Johannes Kepler
    **Answer: a) Isaac Newton**

22. What is the study of living organisms called?
    a) Biology
    b) Chemistry
    c) Physics
    d) Geology
    **Answer: a) Biology**

23. What is the SI unit of electric current?
    a) Ampere (A)
    b) Volt (V)
    c) Watt (W)
    d) Ohm (Ω)
    **Answer: a) Ampere (A)**

24. What is the process of a solid turning into a liquid called?
    a) Sublimation
    b) Condensation
    c) Evaporation
    d) Melting
    **Answer: d) Melting**

25. What is the chemical symbol for iron?
    a) Ir
    b) Fe
    c) Au
    d) Ag
    **Answer: b) Fe**

26. Who discovered the structure of DNA?
    a) James Watson and Francis Crick
    b) Rosalind Franklin
    c) Gregor Mendel
    d) Thomas Hunt Morgan
    **Answer: a) James Watson and Francis Crick**

27. What is the study of the Earth's atmosphere called?
    a) Climatology
    b) Meteorology
    c) Geology
    d) Oceanography
    **Answer: b) Meteorology**

28. What is the smallest bone in the human body?
    a) Stapes
    b) Femur
    c) Tibia
    d) Humerus
    **Answer: a) Stapes**

29. What is the force that opposes motion between two surfaces in contact?
    a) Friction
    b) Gravity
    c) Tension
    d) Inertia
    **Answer: a) Friction**

30. What is the chemical formula for water vapor?
    a) H2O
    b) CO2
    c) O2
    d) H2O2
    **Answer: a) H2O**
31. Who developed the periodic table of elements?
    a) Dmitri Mendeleev
    b) Marie Curie
    c) Ernest Rutherford
    d) Niels Bohr
    **Answer: a) Dmitri Mendeleev**

32. What is the process of a gas turning into a liquid called?
    a) Sublimation
    b) Condensation
    c) Evaporation
    d) Freezing
    **Answer: b) Condensation**

33. What is the chemical symbol for silver?
    a) Si
    b) Ag
    c) Al
    d) Sn
    **Answer: b) Ag**

34. Who discovered X-rays?
    a) Wilhelm Conrad Roentgen
    b) Marie Curie
    c) Max Planck
    d) Albert Einstein
    **Answer: a) Wilhelm Conrad Roentgen**

35. What is the study of celestial objects called?
    a) Cosmology
    b) Astronomy
    c) Astrology
    d) Geology
    **Answer: b) Astronomy**

36. What is the unit of measurement for energy?
    a) Joule
    b) Newton
    c) Watt
    d) Ampere
    **Answer: a) Joule**

37. What is the chemical formula for methane?
    a) CH4
    b) CO2
    c) H2O
    d) NH3
    **Answer: a) CH4**

38. Who proposed the laws of motion?
    a) Isaac Newton
    b) Galileo Galilei
    c) Albert Einstein
    d) Johannes Kepler
    **Answer: a) Isaac Newton**

39. What is the main component of bones and teeth?
    a) Calcium
    b) Iron
    c) Sodium
    d) Potassium
    **Answer: a) Calcium**

40. What is the study of heredity called?
    a) Genetics
    b) Evolutionary biology
    c) Biochemistry
    d) Microbiology
    **Answer: a) Genetics**
41. What is the chemical symbol for sodium?
    a) Na
    b) S
    c) So
    d) NaCl
    **Answer: a) Na**

42. Who discovered the circulation of blood in the human body?
    a) William Harvey
    b) Alexander Fleming
    c) Louis Pasteur
    d) Robert Koch
    **Answer: a) William Harvey**

43. What is the process of a liquid turning into a solid called?
    a) Evaporation
    b) Condensation
    c) Freezing
    d) Sublimation
    **Answer: c) Freezing**

44. What is the chemical formula for sulfuric acid?
    a) H2O
    b) HCl
    c) H2SO4
    d) HNO3
    **Answer: c) H2SO4**

45. What is the SI unit of temperature?
    a) Kelvin (K)
    b) Celsius (°C)
    c) Fahrenheit (°F)
    d) Joule (J)
    **Answer: a) Kelvin (K)**

46. What is the chemical symbol for nitrogen?
    a) Ni
    b) Na
    c) N
    d) Ne
    **Answer: c) N**

47. Who proposed the theory of evolution by natural selection?
    a) Charles Darwin
    b) Gregor Mendel
    c) Alfred Wegener
    d) Louis Pasteur
    **Answer: a) Charles Darwin**

48. What is the study of the behavior of matter at very low temperatures called?
    a) Thermodynamics
    b) Quantum mechanics
    c) Cryogenics
    d) Kinetics
    **Answer: c) Cryogenics**

49. What is the main component of the Earth's core?
    a) Iron
    b) Nickel
    c) Silicon
    d) Oxygen
    **Answer: a) Iron**

50. Who is known as the father of modern chemistry?
    a) Antoine Lavoisier
    b) Dmitri Mendeleev
    c) John Dalton
    d) Robert Boyle
    **Answer: a) Antoine Lavoisier**

These questions cover a wide range of scientific topics and should be helpful for competitive exams. 



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Key Concepts in Science, Part-1 Here are ten science terms along with their definitions: 1. **Hypothesis**:  A proposed explanation for a phenomenon or a prediction about the outcome of an experiment, which can be tested through further experimentation or observation. 2. **Cell**:  The basic structural and functional unit of all living organisms, consisting of a membrane-bound structure that contains genetic material and performs various biological functions. 3. **Photosynthesis**:  The process by which green plants, algae, and certain bacteria convert light energy into chemical energy in the form of glucose, utilizing carbon dioxide and water in the presence of chlorophyll. 4.**Gravity**:  Gravity is the natural force of attraction between objects with mass, drawing them towards each other. It is responsible for phenomena such as the Earth's gravitational pull on objects, keeping them grounded, and governing the motion of celestial bodies in space, including the orbits of planets,
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