Modern Physics MCQs

1. What is the chemical symbol for the element gold?

A) Au
B) Ag
C) Go
D) Gl

Answer: A) Au

2. Which of the following is NOT a noble gas?

A) Helium
B) Neon
C) Argon
D) Hydrogen

Answer: D) Hydrogen

3. What is the chemical formula for water?

A) H2O2
B) CO2
C) H2O
D) O2

Answer: C) H2O

4. Which subatomic particle has a negative charge?

A) Proton
B) Neutron
C) Electron
D) Nucleus

Answer: C) Electron

5. What type of bond is formed when electrons are shared between atoms?

A) Ionic bond
B) Covalent bond
C) Metallic bond
D) Hydrogen bond

Answer: B) Covalent bond

6. What is the atomic number of carbon?

A) 6
B) 8
C) 12
D) 14

Answer: A) 6

7. Which gas is produced during photosynthesis?

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

Answer: A) Oxygen

8. What is the pH value of pure water?

A) 7
B) 0
C) 14
D) 1

Answer: A) 7

9. Which element is essential for human respiration?

A) Carbon
B) Oxygen
C) Nitrogen
D) Hydrogen

Answer: B) Oxygen

10. What is the chemical formula for methane?

A) CH4
B) CO2
C) H2O
D) NH3

Answer: A) CH4

11. Which gas is commonly known as laughing gas?

A) Nitrous oxide
B) Carbon monoxide
C) Sulfur dioxide
D) Ammonia

Answer: A) Nitrous oxide

12. What is the main component of natural gas?

A) Methane
B) Ethane
C) Propane
D) Butane

Answer: A) Methane

13. Which chemical element has the symbol “Fe”?

A) Iron
B) Gold
C) Silver
D) Lead

Answer: A) Iron

14. What is the chemical formula for sodium chloride?

A) NaCl
B) NaOH
C) Na2CO3
D) NaNO3

Answer: A) NaCl

15. What is the chemical symbol for potassium?

A) K
B) P
C) Ka
D) Po

Answer: A) K

16. Which gas is produced when vinegar and baking soda are mixed?

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

Answer: A) Carbon dioxide

17. What is the molecular formula for glucose?

A) C6H12O6
B) H2O
C) CO2
D) CH4

Answer: A) C6H12O6

18. Which element has the atomic number 1?

A) Hydrogen
B) Helium
C) Lithium
D) Boron

Answer: A) Hydrogen

19. What is the chemical formula for sulfuric acid?

A) HCl
B) H2SO4
C) HNO3
D) H2O2

Answer: B) H2SO4

20. Which metal is liquid at room temperature?

A) Mercury
B) Lead
C) Iron
D) Zinc

Answer: A) Mercury

21. What is the chemical formula for ammonia?

A) NH3
B) N2
C) NH4
D) NO2

Answer: A) NH3

22. What is the process of conversion of a solid directly into vapor called?

A) Melting
B) Evaporation
C) Sublimation
D) Condensation

Answer: C) Sublimation

23. Which metal is an essential component of hemoglobin?

A) Iron
B) Copper
C) Zinc
D) Magnesium

Answer: A) Iron

24. What is the chemical symbol for silver?

A) Si
B) Ag
C) Au
D) Sr

Answer: B) Ag

25. What is the lightest element in the periodic table?

A) Hydrogen
B) Helium
C) Lithium
D) Oxygen

Answer: A) Hydrogen

26. Which of the following is a greenhouse gas?

A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Argon

Answer: C) Carbon dioxide

27. What is the chemical formula for hydrogen peroxide?

A) H2O
B) H2O2
C) HO2
D) H3O

Answer: B) H2O2

28. What is the chemical symbol for lead?

A) Ld
B) Pb
C) Pl
D) Pd

Answer: B) Pb

29. Which of the following is NOT a noble gas?

A) Helium
B) Neon
C) Xenon
D) Nitrogen

Answer: D) Nitrogen

30. What is the chemical formula for table salt?

A) NaCl
B) KCl
C) HCl
D) NaOH

Answer: A) NaCl

31. Which element has the chemical symbol “He”?

A) Helium
B) Hydrogen
C) Hafnium
D) Holmium

Answer: A) Helium

32. What is the chemical formula for methane?

A) CH3
B) CH4
C) CO2
D) H2O

Answer: B) CH4

33. Which gas is essential for photosynthesis?

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

Answer: B) Carbon dioxide

34. What is the chemical formula for water?

A) H2O
B) HCl
C) NaCl
D) CO2

Answer: A) H2O

35. Which element has the symbol “Fe”?

A) Iron
B) Gold
C) Silver
D) Lead

Answer: A) Iron

36. What is the atomic number of carbon?

A) 6
B) 8
C) 12
D) 14

Answer: A) 6

37. Which gas has the chemical formula “CO2”?

A) Carbon monoxide
B) Carbon dioxide
C) Nitrogen dioxide
D) Sulfur dioxide

Answer: B) Carbon dioxide

38. What is the pH value of pure water?

A) 7
B) 0
C) 14
D) 1

Answer: A) 7

39. Which gas is produced during cellular respiration?

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

Answer: B) Carbon dioxide

40. What is the chemical formula for methane?

A) CH4
B) CO2
C) H2O
D) NH3

Answer: A) CH4

41. Which gas is commonly used in balloons to make them float?

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

Answer: A) Hydrogen

42. What is the chemical formula for sodium chloride?

A) NaCl
B) NaOH
C) Na2CO3
D) NaNO3

Answer: A) NaCl

43. What is the chemical symbol for potassium?

A) K
B) P
C) Ka
D) Po

Answer: A) K

44. Which gas is produced when vinegar and baking soda are mixed?

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

Answer: A) Carbon dioxide

45. What is the molecular formula for glucose?

A) C6H12O6
B) H2O
C) CO2
D) CH4

Answer: A) C6H12O6

46. Which element has the atomic number 1?

A) Hydrogen
B) Helium
C) Lithium
D) Boron

Answer: A) Hydrogen

47. What is the chemical formula for sulfuric acid?

A) HCl
B) H2SO4
C) HNO3
D) H2O2

Answer: B) H2SO4

48. Which metal is liquid at room temperature?

A) Mercury
B) Lead
C) Iron
D) Zinc

Answer: A) Mercury

49. What is the chemical formula for ammonia?

A) NH3
B) N2
C) NH4
D) NO2

Answer: A) NH3

50. What is the process of conversion of a solid directly into vapor called?

A) Melting
B) Evaporation
C) Sublimation
D) Condensation

Answer: C) Sublimation

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