21. Which is the hardest natural substance?
Correct Answer:
A. Diamond
Explanation: Diamond is the hardest naturally occurring mineral.
General KnowledgePoliceSSC GD
General Knowledge Quiz in Hindi – सामान्य ज्ञान Set 3 (29 MCQs)
इतिहास, भूगोल, विज्ञान, राजव्यवस्था और विविध विषयों के सामान्य ज्ञान प्रश्न। SSC GD, रेलवे, पुलिस और अन्य भर्ती परीक्षाओं के लिए। कुल 29 प्रश्न · समय 20 मिनट · स्तर: Easy।
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Practice Questions & Answers
Try each question and reveal the correct answer when you are ready.
22. Which acid is present in lemon?
Correct Answer:
C. Citric acid
Explanation: Lemons contain citric acid.
23. Which gas is commonly used in balloons because it is lighter than air and non-flammable?
Correct Answer:
A. Helium
Explanation: Helium is light and non-flammable, making it suitable for balloons.
24. Who discovered penicillin?
Correct Answer:
B. Alexander Fleming
Explanation: Alexander Fleming discovered penicillin in 1928.
25. Who developed the theory of relativity?
Correct Answer:
B. Albert Einstein
Explanation: Albert Einstein developed the theories of special and general relativity.
26. Who formulated the laws of motion?
Correct Answer:
B. Isaac Newton
Explanation: Isaac Newton formulated the three laws of motion.
27. Who is known for the theory of evolution by natural selection?
Correct Answer:
C. Charles Darwin
Explanation: Charles Darwin developed the theory of evolution by natural selection.
28. Who is known as the father of genetics?
Correct Answer:
B. Gregor Mendel
Explanation: Gregor Mendel's pea plant experiments laid the foundation of modern genetics.
29. Who invented the telephone?
Correct Answer:
C. Alexander Graham Bell
Explanation: Alexander Graham Bell is commonly credited with inventing the telephone.
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