General Science for Competitive Examinations
50 General Science notes and MCQs for SSC, UPSC, Railway, and other exams. Boost your preparation with key concepts in Physics, Chemistry, and Biology.
1. Which gas is most abundant in the Earth’s atmosphere?
A) Oxygen
B) Nitrogen
C) Carbon Dioxide
D) Hydrogen
Answer:- B) Nitrogen.
2. What is the chemical symbol for gold?
A) Go
B) Au
C) Ag
D) Gd
Answer:- B) Au.
3. Which part of the plant conducts photosynthesis?
A) Root
B) Stem
C) Flower
D) Leaf
Answer:- D) Leaf.
4. Who proposed the theory of relativity?
A) Newton
B) Einstein
C) Bohr
D) Galileo
Answer:- B) Einstein.
5. Which vitamin is produced when the skin is exposed to sunlight?
A) Vitamin A
B) Vitamin B
C) Vitamin D
D) Vitamin C
Answer:- C) Vitamin D.
6. What is the powerhouse of the cell?
A) Nucleus
B) Ribosome
C) Mitochondria
D) Golgi body
Answer:- C) Mitochondria.
7. Water boils at 100°C under which condition?
A) High pressure
B) Sea level pressure
C) Low pressure
D) Vacuum
Answer:- B) Sea level pressure.
8. Which planet is known as the Red Planet?
A) Earth
B) Mars
C) Venus
D) Jupiter
Answer:- B) Mars.
9. What is H2O commonly known as?
A) Hydrogen
B) Oxygen
C) Water
D) Salt
Answer:- C) Water.
10. What is the SI unit of force?
A) Pascal
B) Newton
C) Joule
D) Watt
Answer:- B) Newton.
11. Which organ purifies blood in the human body?
A) Heart
B) Kidney
C) Lungs
D) Liver
Answer:- B) Kidney
12. Which gas is essential for respiration?
A) Carbon dioxide
B) Nitrogen
C) Oxygen
D) Hydrogen
Answer:- C) Oxygen.
13. Which part of the human brain controls balance?
A) Cerebrum
B) Medulla
C) Cerebellum
D) Spinal cord
Answer:- C) Cerebellum.
14. What is the chemical formula of salt?
A) NaCl
B) HCl
C) CaCl₂
D) NaOH
Answer:- A) NaCl.
15. Which gas is released during photosynthesis?
A) Carbon monoxide
B) Oxygen
C) Nitrogen
D) Methane
Answer:- B) Oxygen.
16. What type of energy is stored in a dry cell?
A) Thermal energy
B) Chemical energy
C) Light energy
D) Sound energy
Answer:- B) Chemical energy.
17. Which acid is present in a lemon?
A) Acetic acid
B) Citric acid
C) Lactic acid
D) Tartaric acid
Answer:- B) Citric acid.
18. Which organ is affected by pneumonia?
A) Liver
B) Kidney
C) Heart
D) Lungs
Answer:- D) Lungs.
19. Which metal is liquid at room temperature?
A) Mercury
B) Silver
C) Lead
D) Copper
Answer:- A) Mercury.
20. Which blood group is known as the universal donor?
A) A
B) AB
C) B
D) O
Answer:- D) O.
21. Which planet is closest to the sun?
A) Earth
B) Mars
C) Mercury
D) Venus
Answer:- C) Mercury.
22. What is the main function of white blood cells?
A) Carry oxygen
B) Clot blood
C) Fight infection
D) Provide energy
Answer:- C) Fight infection.
23. Which vitamin is mainly found in citrus fruits?
A) Vitamin A
B) Vitamin B
C) Vitamin C
D) Vitamin D
Answer:- C) Vitamin C.
24. What does DNA stand for?
A) Deoxyribonucleic Acid
B) Deoxyribonucleic Acid
C) Dicarboxylic Nucleic Acid
D) Dioxin Nuclear Acid
Answer:- B) Deoxyribonucleic Acid.
25. Which of the following is a renewable source of energy?
A) Coal
B) Petrol
C) Wind
D) Diesel
Answer:- C) Wind.
26. Which organ controls the entire human body?
A) Heart
B) Kidney
C) Brain
D) Liver
Answer:- C) Brain.
27. Which unit is used to measure electric current?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer:- B) Ampere.
28. Which is the largest planet in the solar system?
A) Saturn
B) Earth
C) Jupiter
D) Neptune
Answer:- C) Jupiter.
29. Which part of the eye controls the amount of light entering?
A) Iris
B) Retina
C) Cornea
D) Pupil
Answer:- A) Iris.
30. Which food is rich in protein?
A) Rice
B) Butter
C) Egg
D) Sugar
Answer:- C) Egg.
31. Hydrogen gas is _.
A) Heavier than air
B) Colorless and heavier than oxygen
C) Lighter than air
D) Heavier than water
Answer:- C) Lighter than air.
32. Which instrument is used to measure temperature?
A) Barometer
B) Thermometer
C) Hygrometer
D) Ammeter
Answer:- B) Thermometer.
33. Which mineral is essential for healthy teeth?
A) Calcium
B) Potassium
C) Iron
D) Iodine
Answer:- A) Calcium.
34. How many bones are there in an adult human body?
A) 206
B) 205
C) 201
D) 209
Answer:- A) 206.
35. The largest bone in the human body is.
A) Femur
B) Tibia
C) Humerus
D) Radius
Answer:- A) Femur.
36. Which disease is caused by a virus?
A) Tuberculosis
B) Typhoid
C) AIDS
D) Cholera
Answer:- C) AIDS.
37. Which metal is used to make aircrafts?
A) Lead
B) Aluminum
C) Iron
D) Zinc
Answer:- B) Aluminum.
38. Which type of mirror is used in vehicles as a rear-view mirror?
A) Plane
B) Convex
C) Concave
D) None
Answer:- B) Convex.
39. Which part of the plant absorbs water and minerals?
A) Leaf
B) Flower
C) Root
D) Stem
Answer:- C) Root.
40. Which planet is known for its rings?
A) Venus
B) Mars
C) Saturn
D) Neptune
Answer:- C) Saturn.
41. Which metal is most abundant in the Earth’s crust?
A) Iron
B) Aluminum
C) Copper
D) Zinc
Answer:- B) Aluminum.
42. Which scientist is known as the father of the modern periodic table?
A) Mendeleev
B) Newton
C) Einstein
D) Curie
Answer:- A) Mendeleev.
43. Which disease is caused by the deficiency of iodine?
A) Anemia
B) Beriberi
C) Goiter
D) Scurvy
Answer:- C) Goiter.
44. The sun is a___?
A) Planet
B) Moon
C) Star
D) Comet
Answer:- C) Star.
45. What is the boiling point of water in Fahrenheit?
A) 100°F
B) 180°F
C) 212°F
D) 98.6°F
Answer:- C) 212°F.
46. Which gland is called the master gland?
A) Thyroid
B) Pituitary
C) Adrenal
D) Pancreas
Answer:- B) Pituitary.
47. Which planet is known as the “Evening Star”?
A) Mars
B) Venus
C) Mercury
D) Jupiter
Answer:- B) Venus.
48. Which blood cells help in clotting?
A) Red blood cells
B) White blood cells
C) Platelets
D) Plasma
Answer:- C) Platelets.
49. What is the atomic number of oxygen?
A) 6
B) 8
C) 10
D) 16
Answer:- B) 8.
50. Which planet has the most moons?
A) Earth
B) Mars
C) Jupiter
D) Saturn
Answer:- D) Saturn.