General Science Questions (MCQs) for Competitive Exams| General Science - General Knowledge Questions and Answers in English

 General Science Question/ Answers

                                                 Astronomy                      

 1. Which is the largest planet in our solar system?

a. Earth

b. Jupiter

c. Saturn

d. Uranus

Answer: b. Jupiter 

  

 

 2. What is the estimated age of the universe?

A. 5 billion years

B. 13.8 billion years

C. 100 billion years

D. 500 billion years

Answer: b. 13.8 billion years

 

 3. What are the study of the physical and natural phenomena of the Earth and its atmosphere called?

a. Astrophysics

b. Geology

c. Meteorology

d. Oceanography

Answer: c. Meteorology

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

a. Solar energy

b. Nuclear energy

c. Geothermal energy

d. Hydro energy

Answer: a. Solar energy

 5. What is the process by which energy is transferred from the sun to the Earth?

a. Conduction

b. Convection

c. Radiation

d. Evaporation

Answer: c. Radiation

 6. What is the term used for the study of stars and planets?

A) Astrology

B) Astronomy

C) Cosmology

D) Geology

Answer: b) Astronomy

 7. What is the smallest planet in our solar system?

a. Mercury

b. Venus

c. Mars

d. Earth

Answer: a. Mercury

Physics

 8. What is the unit of pressure in the SI system?

a. Joule

b. Newton

c. Pascal

d. Watt

Answer: c. Pascal

 9. What is the unit of energy in the SI system?

a. Joule

b. Newton

c. Pascal

d. Watt

Answer: a. Joule

10. What is the unit of force in the SI system?

a. Joule

b. Newton

c. Pascal

d. Watt

Answer: b. Newton

11. What is the unit of power in the SI system?

a. Joule

b. Newton

c. Pascal

d. Watt

Answer: d. Watt

12. Who discovered penicillin?

a. Alexander Fleming

b. Louis Pasteur

c. Charles Darwin

d. Isaac Newton

Answer: a. Alexander Fleming

13. Who formulated the laws of motion?

a. Charles Darwin

b. Louis Pasteur

c. Alexander Fleming

d. Isaac Newton

Answer: d. Isaac Newton

14. What is the unit of temperature in the SI system?

a. Kelvin

b. Celsius

c. Fahrenheit

d. Rankine

Answer: a. Kelvin

15. Who discovered the electron?

a. J.J. Thomson

b. Robert Boyle

c. Michael Faraday

d. James Clerk Maxwell

Answer: a. J.J. Thomson

16. Who discovered the proton?

a. J.J. Thomson

b. Robert Boyle

c. Ernest Rutherford

d. James Clerk Maxwell

Answer: c. Ernest Rutherford

17. What is the formula for calculating electric current?

a. Current = Voltage/Resistance

b. Current = Power/Voltage

c. Current = Power x Time

d. Current = Voltage x Resistance

Answer: a. Current = Voltage/Resistance

18. Which of the following is not a law of thermodynamics?

a. The first law of thermodynamics

b. The second law of thermodynamics

c. The third law of thermodynamics

d. The law of motion

Answer: d. The law of motion

Chemistry

19. What is the smallest particle of an element?

a. Ion

b. Atom

c. Molecule

d. Proton

Answer: b. Atom

 

20. What is the process by which water vapor turns into liquid?

a. Evaporation

b. Condensation

c. Sublimation

d. None of the above

Answer: b. Condensation

21. What is the process by which a solid changes into a liquid?

A) Freezing

B) Melting

C) Sublimation

D) Condensation

Answer: B) Melting

22. What is the process by which a solid turns directly into a gas?

a. Sublimation

b. Evaporation

c. Condensation

d. None of the above

Answer: a. Sublimation

23. What is the process by which a liquid turns into a gas?

a. Evaporation

b. Condensation

c. Sublimation

d. None of the above

Answer: a. Evaporation

24. What is the chemical symbol for iron?

a. Fe

b. Ir

c. Au

d. Ag

Answer: a. Fe

 

25. What is the chemical formula for water?

a. H2O

b. CO2

c. CH4

d. N2O

Answer: a. H2O

 

26. What is the term used for the study of the Earth's crust and its processes?

A) Geology

B) Hydrology

C) Oceanography

D) Meteorology

Answer: A) Geology

 

27. What is the term used for the study of fossils?

A) Paleontology

B) Archaeology

C) Anthropology

D) Geology

Answer: A) Paleontology

 

 

28. What is the term used for the study of earthquakes?

A) Seismology

B) Meteorology

C) Oceanography

D) Geology

Answer: A) Seismology

 

29. What type of rock is formed from the cooling of molten rock?

a. Igneous rock

b. Sedimentary rock

c. Metamorphic rock

d. None of the above

Answer: a. Igneous rock

 

30. What type of rock is formed from the compression of sediment?

a. Sedimentary rock

b. Igneous rock

c. Metamorphic rock

d. None of the above

Answer: a. Sedimentary rock

31. What type of rock is formed from the alteration of existing rock due to heat and pressure?

a. Metamorphic rock

b. Igneous rock

c. Sedimentary rock

d. None of the above

Answer: a. Metamorphic rock

32. What is the main cause of acid rain?

a. Burning of fossil fuels

b. Deforestation

c. Overgrazing

d. Pesticide use

Answer: a. Burning of fossil fuels

33. What is the chemical formula for carbon dioxide?

a. CO2

b. H2O

c. CH4

d. N2O

Answer: a. CO2

34. What is the greenhouse effect?

a. The warming of the Earth's surface due to increased atmospheric carbon dioxide

b. The cooling of the Earth's surface due to increased atmospheric carbon dioxide

c. The warming of the Earth's atmosphere due to increased atmospheric oxygen

d. The cooling of the Earth's atmosphere due to increased atmospheric oxygen

Answer: a. The warming of the Earth's surface due to increased atmospheric carbon dioxide

35. What is the biggest source of ocean pollution?

a. Plastic waste

b. Agricultural runoff

c. Industrial waste

d. Shipping and boat traffic

Answer: a. Plastic waste

36. What is the chemical symbol for oxygen?

a. O

b. N

c. C

d. H

Answer: a. O

37. What is the main component of smog?

a. Carbon dioxide

b. Nitrogen dioxide

c. Sulfur dioxide

d. Ozone

Answer: b. Nitrogen dioxide

38. What is the chemical formula for sulfuric acid?

a. H2SO4

b. HNO3

c. HC2H3O2

d. NaCl

Answer: a. H2SO4

39. What is the chemical formula for nitric acid?

a. HNO3

b. H2SO4

c. HC2H3O2

d. NaCl

Answer: a. HNO3

40. What is the main cause of eutrophication?

a. Increased levels of nitrogen and phosphorus in water bodies

b. Increased levels of carbon dioxide in water bodies

c. Increased levels of oxygen in water bodies

d. Increased levels of sulfur in water bodies

Answer: a. Increased levels of nitrogen and phosphorus in water bodies

41. What is the main cause of ozone depletion?

a. Increased levels of carbon dioxide

b. Increased levels of nitrogen dioxide

c. Increased levels of chlorofluorocarbons (CFCs)

d. Increased levels of sulfur dioxide

Answer: c. Increased levels of chlorofluorocarbons (CFCs)

42. What is the chemical formula for table salt?

a. NaCl

b. HCl

c. H2SO4

d. HNO3

Answer: a. NaCl

43. What is the chemical formula for ammonia?

a. NH3

b. CO2

c. CH4

d. N2O

Answer: a. NH3

44. What is the chemical formula for methane?

a. CH4

b. CO2

c. NH3

d. N2O

Answer: a. CH4

Biology

45. What is the scientific name for the process of photosynthesis?

a. Respiration

b. Fermentation

c. Photosynthesis

d. Hydrolysis

Answer: c. Photosynthesis

46. What is the scientific name for the study of plants?

a. Botany

b. Zoology

c. Microbiology

d. Mycology

Answer: a. Botany

47. What is the main function of the cell membrane?

a. To regulate the exchange of materials between the cell and its environment

b. To provide structure to the cell

c. To control cellular metabolism

d. To produce energy for the cell

Answer: a. To regulate the exchange of materials between the cell and its environment

48. What is the scientific name for the process of respiration in cells?

a. Photosynthesis

b. Fermentation

c. Cellular respiration

d. Hydrolysis

Answer: c. Cellular respiration

19. Who proposed the theory of evolution by natural selection?

a. Charles Darwin

b. Isaac Newton

c. Albert Einstein

d. Stephen Hawking

Answer: a. Charles Darwin

50. Who discovered the structure of DNA?

a. James Watson and Francis Crick

b. Rosalind Franklin

c. Gregor Mendel

d. Charles Darwin

Answer: a. James Watson and Francis Crick

51. What is the function of the mitochondria in a cell?

a. To store energy

b. To transport substances in and out of the cell

c. To produce energy

d. To regulate the cell's activities

Answer: c. To produce energy

52. Who is known as the father of genetics?

a. Charles Darwin

b. Gregor Mendel

c. James Watson

d. Francis Crick

Answer: b. Gregor Mendel

53. What is the smallest unit of structure in a DNA molecule?

A) Nucleotide

B) Chromosome

C) Gene

D) Cell

Answer: A) Nucleotide

54. What is the term used for the study of plants?

A) Botany

B) Zoology

C) Entomology

D) Ornithology

Answer: A) Botany

55. What is the term used for the study of insects?

A) Entomology

B) Herpetology

C) Ichthyology

D) Ornithology

Answer: A) Entomology

56. What is the process by which animals make energy from food?

a. Respiration

b. Photosynthesis

c. Fermentation

d. Digestion

Answer: a. Respiration

57. What is the scientific name for the study of animals?

a. Botany

b. Zoology

c. Microbiology

d. Mycology

Answer: b. Zoology

58. What is the scientific name for the process of breaking down organic matter by microorganisms?

a. Photosynthesis

b. Fermentation

c. Cellular respiration

d. Decomposition

Answer: d. Decomposition

59. What is the scientific name for the process of converting glucose into ethanol and carbon dioxide in the absence of oxygen?

a. Photosynthesis

b. Fermentation

c. Cellular respiration

d. Hydrolysis

Answer: b. Fermentation

60. What is the scientific name for the process of breaking down large molecules into smaller ones using water?

a. Photosynthesis

b. Fermentation

c. Cellular respiration

d. Hydrolysis

Answer: d. Hydrolysis

61. What is the scientific name for the study of microorganisms?

a. Botany

b. Zoology

c. Microbiology

d. Mycology

Answer: c. Microbiology

62. What is the function of ribosomes in cells?

a. To produce energy for the cell

b. To control cellular metabolism

c. To produce proteins

d. To regulate the exchange of materials between the cell and its environment

Answer: c. To produce proteins

63. What is the function of the nucleus in cells?

a. To produce energy for the cell

b. To control cellular metabolism

c. To store genetic information

d. To regulate the exchange of materials between the cell and its environment

Answer: c. To store genetic information

Math

64. What is the value of pi (π)?

a. 3.14

b. 3.14159

c. 22/7

d. All of the above

Answer: d. All of the above

65. What is the formula for the area of a circle?

a. A = πr^2

b. A = r^2

c. A = πd

d. A = d^2

Answer: a. A = πr^2

66. What is the formula for the volume of a sphere?

a. V = πr^3

b. V = 4/3πr^3

c. V = r^3

d. V = 2πr^3

Answer: b. V = 4/3πr^3

67. What is the formula for the slope of a line?

a. m = y2 - y1 / x2 - x1

b. m = x2 - x1 / y2 - y1

c. m = y1 - y2 / x1 - x2

d. m = x1 - x2 / y1 - y2

Answer: a. m = y2 - y1 / x2 - x1

68. What is the formula for the perimeter of a rectangle?

a. P = 2(l + w)

b. P = 2l + 2w

c. P = l + w

d. P = lw

Answer: a. P = 2(l + w)

69. What is the formula for the area of a rectangle?

a. A = lw

b. A = 2lw

c. A = 2(l + w)

d. A= 2(l/w)

Answer: a. A = lw

   

70. What is the value of x if 3x + 18 = 36?

a. 6

b. 5

c. 4

d. 3

Answer: a. 6