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Science MCQs - Biology, Chemistry, Physics
BIOLOGY (40 MCQs)
1. Which is the largest gland in the human body?
Answer: B. Liver
2. Which vitamin is synthesized in the skin?
Answer: D. Vitamin D
3. Photosynthesis occurs in which organelle?
Answer: C. Chloroplast
4. Mendel is known as the father of:
Answer: C. Genetics
5. The functional unit of the kidney is:
Answer: A. Nephron
6. Malaria is caused by:
Answer: D. Protozoa
7. Which hormone regulates calcium in blood?
Answer: C. Parathormone
8. The genetic material of HIV is:
Answer: B. RNA
9. Which blood group is universal donor?
Answer: D. O−
10. Which of the following is a xylem element?
Answer: B. Tracheid
11. The powerhouse of the cell is:
Answer: C. Mitochondria
12. Which vitamin is essential for blood clotting?
Answer: C. Vitamin K
13. Which part of the brain controls heartbeat?
Answer: C. Medulla oblongata
14. Which is a sexually transmitted disease?
Answer: C. Syphilis
15. Which enzyme is found in saliva?
Answer: A. Amylase
16. Which structure connects muscles to bones?
Answer: B. Tendon
17. Which part of the eye regulates light entry?
Answer: B. Iris
18. Who proposed the fluid mosaic model?
Answer: B. Singer & Nicolson
19. Tuberculosis is caused by:
Answer: A. Mycobacterium tuberculosis
20. Cell wall of fungi is made of:
Answer: B. Chitin
21. What is the role of ribosomes?
Answer: A. Protein synthesis
22. Which structure in plants transports water?
Answer: B. Xylem
23. Which hormone controls metabolism?
Answer: B. Thyroxine
24. AIDS affects:
Answer: B. Immune system
25. Albinism is due to absence of:
Answer: A. Melanin
26. Plasmolysis occurs in:
Answer: C. Hypertonic solution
27. Which organ secretes bile?
Answer: C. Liver
28. Haemophilia is a:
Answer: B. Genetic disorder
29. Site of fertilization in humans:
Answer: C. Fallopian tube
30. Largest artery in human body:
Answer: B. Aorta
31. Vaccine for tuberculosis:
Answer: A. BCG
32. Which is not a greenhouse gas?
Answer: C. O₂
33. Blood cells responsible for clotting:
Answer: C. Platelets
34. Which of these is an example of a flat bone?
Answer: C. Skull
35. Main site of photosynthesis:
Answer: C. Leaf
36. Which vitamin is fat-soluble?
Answer: C. Vitamin D
37. Antibody is a:
Answer: C. Protein
38. Which is the structural unit of DNA?
Answer: A. Nucleotide
39. Endocrine glands are also called:
Answer: A. Ductless glands
40. Fertilized egg is known as:
Answer: B. Zygote
CHEMISTRY (30 MCQs)
41. Which is the lightest element?
Answer: A. Hydrogen
42. Atomic number of oxygen is:
Answer: B. 8
43. Which bond is present in water (H₂O)?
Answer: B. Covalent
44. pH of neutral solution is:
Answer: B. 7
45. Which is a noble gas?
Answer: C. Argon
46. Which element forms the basis of organic compounds?
Answer: B. Carbon
47. Electrolysis of water produces:
Answer: A. H₂ and O₂
48. Formula of ammonium nitrate is:
Answer: A. NH₄NO₃
49. Who developed the Periodic Table?
Answer: B. Mendeleev
50. Which acid is present in vinegar?
Answer: C. Acetic acid
51. Molecular formula of glucose:
Answer: A. C₆H₁₂O₆
52. Chemical formula of washing soda:
Answer: B. Na₂CO₃·10H₂O
53. Which gas is used in balloons?
Answer: C. Helium
54. Strongest acid in water:
Answer: D. HI
55. Which of these is not an alkali metal?
Answer: C. Calcium
56. Number of moles in 18g of water:
Answer: A. 1
57. Most electronegative element:
Answer: A. Fluorine
58. Valency of nitrogen:
Answer: D. Both A & B
59. Which is a strong electrolyte?
Answer: B. NaCl
60. Which gas turns lime water milky?
Answer: B. CO₂
61. A saturated hydrocarbon is:
Answer: C. Ethane
62. The metal used in thermometers:
Answer: A. Mercury
63. An element with atomic number 17 is:
Answer: C. Chlorine
64. The atomic mass unit (amu) is based on:
Answer: C. Carbon-12
65. Boiling point of water:
Answer: A. 100°C
66. Which metal is most reactive?
Answer: C. Potassium
67. PH scale measures:
Answer: C. Acidity/Basicity
68. Dry ice is:
Answer: C. Solid CO₂
69. Which is a noble metal?
Answer: B. Silver
70. Which type of bond is formed between metals and nonmetals?
Answer: C. Ionic
PHYSICS (30 MCQs)
71. SI unit of force is:
Answer: B. Newton
72. Speed of light in vacuum is:
Answer: A. 3 × 10⁸ m/s
73. Energy possessed by a body due to motion is:
Answer: D. Kinetic energy
74. Work done =
Answer: C. Force × Displacement
75. Unit of electric current:
Answer: A. Ampere
76. Instrument to measure voltage:
Answer: C. Voltmeter
77. Which mirror is used in headlights?
Answer: A. Concave
78. Sound needs medium for propagation:
Answer: A. True
79. 1 kilowatt =
Answer: B. 1000 W
80. Acceleration due to gravity on Earth:
Answer: A. 9.8 m/s²
81. Which lens is used to correct myopia?
Answer: B. Concave
82. Loudness depends on:
Answer: A. Amplitude
83. Ohm's law: V =
Answer: A. IR
84. Image formed by plane mirror is:
Answer: B. Virtual, erect
85. Unit of power:
Answer: A. Watt
86. Newton's Third Law:
Answer: B. Action = –Reaction
87. Instrument to measure temperature:
Answer: B. Thermometer
88. The unit of pressure:
Answer: C. Pascal
89. Force acting on a unit area is:
Answer: B. Pressure
90. In a vacuum, sound:
Answer: B. Does not travel
91. Which is not a renewable source of energy?
Answer: C. Coal
92. Which law states: current ∝ voltage?
Answer: C. Ohm's law
93. Image formed by convex mirror is always:
Answer: B. Virtual and erect
94. One light-year is:
Answer: A. Distance light travels in 1 year
95. Laws of motion were formulated by:
Answer: C. Newton
96. If object distance = focal length, image is:
Answer: A. At infinity
97. Echo is heard due to:
Answer: A. Reflection
98. Electric power formula:
Answer: D. Both A & C
99. Kinetic energy =
Answer: A. ½ mv²
100. Which phenomenon causes a pencil to appear bent in water?
Answer: B. Refraction