General Science MCQ Physics, Chemistry, Biology, and Earth/Space Science.
Physics – 25 MCQs
1. SI unit of force is:
A. Watt
B. Joule
C. Newton
D. Pascal
Answer: C
2. Which phenomenon is used in optical fibers?
A. Refraction
B. Total internal reflection
C. Diffraction
D. Interference
Answer: B
3. Speed of sound is maximum in:
A. Air
B. Water
C. Steel
D. Vacuum
Answer: C
4. 1 kWh equals:
A. 3.6 × 10⁶ J
B. 3.6 × 10⁵ J
C. 1000 J
D. 3600 J
Answer: A
5. The device to measure electric current is:
A. Voltmeter
B. Ammeter
C. Galvanometer
D. Barometer
Answer: B
6. Which lens is used to correct myopia?
A. Convex
B. Concave
C. Bifocal
D. Cylindrical
Answer: B
7. Work done is zero when:
A. Force is zero
B. Displacement is zero
C. Force is perpendicular to displacement
D. All of these
Answer: D
8. Which color has the longest wavelength?
A. Violet
B. Blue
C. Red
D. Green
Answer: C
9. Acceleration due to gravity on moon is about:
A. 1/6th of Earth
B. 1/4th of Earth
C. Same as Earth
D. Twice of Earth
Answer: A
10. Transformer works on the principle of:
A. Self induction
B. Mutual induction
C. Magnetic effect
D. Heating effect
Answer: B
11. Echo is produced due to:
A. Refraction of sound
B. Reflection of sound
C. Diffraction of sound
D. Interference of sound
Answer: B
12. The unit of power is:
A. Joule
B. Watt
C. Newton
D. Pascal
Answer: B
13. Which law explains why we fall forward when a bus stops suddenly?
A. Newton’s 1st Law
B. Newton’s 2nd Law
C. Newton’s 3rd Law
D. Law of Gravitation
Answer: A
14. Kinetic energy of a body depends on:
A. Mass only
B. Velocity only
C. Mass and velocity both
D. Height
Answer: C
15. Sound waves are:
A. Longitudinal
B. Transverse
C. Electromagnetic
D. Stationary
Answer: A
16. Fusion reaction takes place at:
A. Low temperature
B. High temperature
C. Normal temperature
D. 0°C
Answer: B
17. The instrument used to measure atmospheric pressure:
A. Thermometer
B. Barometer
C. Hygrometer
D. Ammeter
Answer: B
18. Which is a vector quantity?
A. Speed
B. Distance
C. Mass
D. Velocity
Answer: D
19. Ohm’s law is valid for:
A. Semiconductors
B. Metallic conductors
C. Electrolytes
D. All of these
Answer: B
20. Rainbow is formed due to:
A. Reflection only
B. Refraction only
C. Dispersion & total internal reflection
D. Diffraction
Answer: C
21. The time period of a simple pendulum depends on:
A. Mass of bob
B. Length of pendulum
C. Amplitude
D. Material of bob
Answer: B
22. Which waves are used in SONAR?
A. Radio waves
B. Ultrasonic waves
C. Infrared waves
D. Light waves
Answer: B
23. 1 horsepower =
A. 746 W
B. 1000 W
C. 550 W
D. 646 W
Answer: A
24. Which of these is not a renewable source of energy?
A. Solar
B. Wind
C. Coal
D. Tidal
Answer: C
25. Light year is a unit of:
A. Time
B. Distance
C. Speed
D. Intensity
Answer: B
Chemistry – 25 MCQs
26. Chemical formula of common salt:
A. Na₂CO₃
B. NaCl
C. KCl
D. NaHCO₃
Answer: B
27. pH of pure water is:
A. 0
B. 7
C. 14
D. 1
Answer: B
28. Which gas is used in fire extinguishers?
A. Oxygen
B. Hydrogen
C. Carbon dioxide
D. Nitrogen
Answer: C
29. Atomic number of Carbon is:
A. 4
B. 6
C. 8
D. 12
Answer: B
30. Rusting of iron is an example of:
A. Reduction
B. Oxidation
C. Neutralization
D. Decomposition
Answer: B
31. The hardest natural substance is:
A. Graphite
B. Diamond
C. Quartz
D. Iron
Answer: B
32. Which acid is present in lemon?
A. Acetic acid
B. Citric acid
C. Tartaric acid
D. Oxalic acid
Answer: B
33. LPG mainly contains:
A. Methane
B. Butane + Propane
C. Ethane
D. Hydrogen
Answer: B
34. Which metal is liquid at room temperature?
A. Sodium
B. Mercury
C. Gallium
D. Bromine
Answer: B
35. Baking soda is:
A. Na₂CO₃
B. NaHCO₃
C. CaCO₃
D. NaOH
Answer: B
36. Number of neutrons in ¹²C₆:
A. 6
B. 12
C. 0
D. 18
Answer: A
37. Which gas turns lime water milky?
A. O₂
B. CO₂
C. N₂
D. H₂
Answer: B
38. Aqua regia is a mixture of:
A. HCl + H₂SO₄
B. HCl + HNO₃
C. HNO₃ + H₂SO₄
D. HCl + HF
Answer: B
39. Which element is most abundant in Earth’s crust?
A. Silicon
B. Oxygen
C. Aluminum
D. Iron
Answer: B
40. Isotopes have same:
A. Mass number
B. Atomic number
C. Neutrons
D. Nucleons
Answer: B
41. Which is used as an antacid?
A. NaOH
B. Mg(OH)₂
C. CaO
D. NH₄OH
Answer: B
42. Dry ice is solid:
A. H₂O
B. CO₂
C. N₂
D. NH₃
Answer: B
43. Which gas is known as laughing gas?
A. NO
B. N₂O
C. NO₂
D. CO
Answer: B
44. The process of conversion of solid to gas directly:
A. Condensation
B. Sublimation
C. Evaporation
D. Melting
Answer: B
45. Which of these is a noble gas?
A. Oxygen
B. Nitrogen
C. Argon
D. Hydrogen
Answer: C
46. Vinegar contains:
A. Citric acid
B. Acetic acid
C. Formic acid
D. Lactic acid
Answer: B
47. Which metal is stored in kerosene?
A. Sodium
B. Magnesium
C. Iron
D. Copper
Answer: A
48. Ozone layer protects us from:
A. Infrared rays
B. Ultraviolet rays
C. X-rays
D. Gamma rays
Answer: B
49. Catalyst used in Haber’s process:
A. Nickel
B. Iron
C. Platinum
D. Vanadium
Answer: B
50. Which is not an allotrope of carbon?
A. Diamond
B. Graphite
C. Fullerene
D. Carborundum
Answer: D
Biology – 25 MCQs
51. Powerhouse of the cell:
A. Nucleus
B. Mitochondria
C. Ribosome
D. Chloroplast
Answer: B
52. Which blood group is universal donor?
A. A
B. B
C. AB
D. O
Answer: D
53. Photosynthesis occurs in:
A. Mitochondria
B. Chloroplast
C. Ribosome
D. Nucleus
Answer: B
54. Largest gland in human body:
A. Pancreas
B. Liver
C. Thyroid
D. Pituitary
Answer: B
55. Normal human body temperature:
A. 96.8°F
B. 98.6°F
C. 100°F
D. 95°F
Answer: B
56. Deficiency of Vitamin C causes:
A. Rickets
B. Scurvy
C. Night blindness
D. Beri-beri
Answer: B
57. Which organ purifies blood in humans?
A. Heart
B. Liver
C. Kidney
D. Lungs
Answer: C
58. DNA stands for:
A. Deoxyribonucleic Acid
B. Diribonucleic Acid
C. Dinitro Acid
D. None
Answer: A
59. Bile is secreted by:
A. Pancreas
B. Liver
C. Gall bladder
D. Stomach
Answer: B
60. Number of chromosomes in humans:
A. 42
B. 44
C. 46
D. 48
Answer: C
61. Which part of plant conducts water?
A. Phloem
B. Xylem
C. Cambium
D. Stomata
Answer: B
62. Malaria is caused by:
A. Bacteria
B. Virus
C. Protozoa
D. Fungus
Answer: C
63. Which vitamin is produced in skin by sunlight?
A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D
Answer: D
64. Insulin is secreted by:
A. Liver
B. Pancreas
C. Pituitary
D. Thyroid
Answer: B
65. Study of fungi is called:
A. Cytology
B. Mycology
C. Virology
D. Botany
Answer: B
66. Which animal is cold-blooded?
A. Whale
B. Bat
C. Frog
D. Pigeon
Answer: C
67. Smallest bone in human body:
A. Femur
B. Stapes
C. Tibia
D. Humerus
Answer: B
68. Which enzyme is present in saliva?
A. Pepsin
B. Trypsin
C. Amylase
D. Lipase
Answer: C
69. Heart is covered by:
A. Pleura
B. Pericardium
C. Meninges
D. Capsule
Answer: B
70. Which disease is caused by virus?
A. Typhoid
B. Cholera
C. AIDS
D. Tuberculosis
Answer: C
71. Red blood cells are produced in:
A. Liver
B. Bone marrow
C. Spleen
D. Kidney
Answer: B
72. Which plant hormone is responsible for ripening of fruit?
A. Auxin
B. Gibberellin
C. Cytokinin
D. Ethylene
Answer: D
73. Double fertilization occurs in:
A. Gymnosperms
B. Angiosperms
C. Algae
D. Fungi
Answer: B
74. Which is not a part of brain?
A. Cerebrum
B. Cerebellum
C. Medulla
D. Trachea
Answer: D
75. Pulse rate is measured from:
A. Vein
B. Artery
C. Capillary
D. Nerve
Answer: B
Earth & Space Science – 25 MCQs
76. Largest planet in solar system:
A. Earth
B. Saturn
C. Jupiter
D. Neptune
Answer: C
77. Which layer of atmosphere contains ozone?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
Answer: B
78. The nearest star to Earth after Sun:
A. Sirius
B. Proxima Centauri
C. Alpha Centauri
D. Vega
Answer: B
79. Tides are caused by:
A. Gravitational pull of Moon & Sun
B. Earth’s rotation only
C. Winds
D. Earthquakes
Answer: A
80. Which gas is most abundant in Earth’s atmosphere?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Argon
Answer: B
81. Richter scale measures:
A. Wind speed
B. Earthquake intensity
C. Rainfall
D. Temperature
Answer: B
82. The outermost layer of Earth is:
A. Core
B. Mantle
C. Crust
D. Magma
Answer: C
83. Which planet is known as Red Planet?
A. Venus
B. Mars
C. Jupiter
D. Mercury
Answer: B
84. Seasons on Earth are caused by:
A. Earth’s rotation
B. Tilt of Earth’s axis
C. Distance from Sun
D. Moon’s gravity
Answer: B
85. Which is a sedimentary rock?
A. Granite
B. Basalt
C. Limestone
D. Marble
Answer: C
86. Halley’s Comet appears after every:
A. 56 years
B. 66 years
C. 76 years
D. 86 years
Answer: C
87. The phenomenon of day and night is due to:
A. Revolution
B. Rotation
C. Both
D. None
Answer: B
88. Which planet has the most moons?
A. Jupiter
B. Saturn
C. Uranus
D. Neptune
Answer: B Note: Saturn currently leads with 140+ confirmed moons
89. Instrument to measure rainfall:
A. Barometer
B. Hygrometer
C. Rain gauge
D. Anemometer
Answer: C
90. Which is not a greenhouse gas?
A. CO₂
B. CH₄
C. N₂O
D. O₂
Answer: D
91. The deepest point in ocean:
A. Mariana Trench
B. Java Trench
C. Tonga Trench
D. Puerto Rico Trench
Answer: A
92. Solar eclipse occurs when:
A. Earth comes between Sun & Moon
B. Moon comes between Sun & Earth
C. Sun comes between Earth & Moon
D. None
Answer: B
93. Which planet rotates clockwise?
A. Earth
B. Venus
C. Mars
D. Jupiter
Answer: B
94. The study of earthquakes is called:
A. Geology
B. Seismology
C. Meteorology
D. Geography
Answer: B
95. Which layer of Earth is liquid?
A. Inner core
B. Outer core
C. Mantle
D. Crust
Answer: B
96. El Niño is associated with:
A. Earthquake
B. Climate change in Pacific Ocean
C. Volcano
D. Cyclone
Answer: B
97. Which is the hottest planet?
A. Mercury
B. Venus
C. Mars
D. Jupiter
Answer: B
98. The unit to measure astronomical distances:
A. Kilometer
B. Light year
C. Mile
D. Angstrom
Answer: B
99. Which soil is best for cotton cultivation?
A. Alluvial
B. Black soil
C. Red soil
D. Laterite
Answer: B
100. First artificial satellite launched:
A. Apollo 11
B. Sputnik 1
C. Voyager 1
D. Aryabhata
Answer: B