Physics
Practice questions 1-25
1. Who discovered the law of gravitation? – Isaac Newton
2. What is the SI unit of force? – Newton (N)
3. The speed of light is approximately how many km/s? – 3,00,000 km/s
4. What is the unit of electrical resistance? – Ohm (Ω)
5. Which instrument is used to measure atmospheric pressure? – Barometer
6. Which planet is known as the "morning star"? – Venus
7. What is the boiling point of water at sea level in Celsius? – 100°C
8. What is the chemical formula of water? – H₂O
9. What is the SI unit of power? – Watt (W)
10. What type of energy is stored in a stretched spring? – Potential Energy
11. What is the first law of motion called? – Law of Inertia
12. Who invented the electric bulb? – Thomas Edison
13. Which mirror is used in car rear-view mirrors? – Convex Mirror
14. Which type of lens is used to correct myopia? – Concave Lens
15. What type of current is supplied to homes? – Alternating Current (AC)
16. The rate of doing work is called? – Power
17. What is measured in volts? – Electric Potential / Voltage
18. The freezing point of water in Kelvin is? – 273 K
19. Sound waves cannot travel through which medium? – Vacuum
20. What is the SI unit of frequency? – Hertz (Hz)
21. Who discovered X-rays? – Wilhelm Rontgen
22. The first man to propose the heliocentric theory was? – Nicolaus Copernicus
23. What is the acceleration due to gravity on Earth? – 9.8 m/s²
24. What is the SI unit of pressure? – Pascal (Pa)
25. The device used to convert AC to DC is called? – Rectifier
Practice questions 26-55
26. Who is known as the Father of Modern Physics? – Albert Einstein
27. What is the SI unit of work? – Joule (J)
28. What type of lens is used in magnifying glasses? – Convex lens
29. What is the SI unit of energy? – Joule (J)
30. Which scientist discovered radioactivity? – Henri Becquerel
31. What is the unit of electric current? – Ampere (A)
32. Which type of mirror is used by dentists? – Concave mirror
33. Which law explains the relationship between current, voltage and resistance? – Ohm’s Law
34. Which planet has the strongest gravitational pull? – Jupiter
35. Which color of light has the longest wavelength? – Red
36. Which color of light has the shortest wavelength? – Violet
37. What is the SI unit of electric charge? – Coulomb (C)
38. What is measured using a thermometer? – Temperature
39. What is the force that opposes motion called? – Friction
40. Which energy source is called a renewable source? – Solar energy
41. Who invented the telephone? – Alexander Graham Bell
42. Which type of mirror is used in headlights of cars? – Concave mirror
43. What is the SI unit of speed? – m/s
44. Which instrument is used to measure electric current? – Ammeter
45. What is the SI unit of potential difference? – Volt (V)
46. Which device is used to measure electric resistance? – Ohmmeter
47. Which law states that “every action has an equal and opposite reaction”? – Newton’s Third Law of Motion
48. What is the speed of sound in air (approx.)? – 343 m/s
49. Which type of energy is possessed by a moving body? – Kinetic energy
50. What is the SI unit of power of a lens? – Dioptre (D)
51. Which instrument is used to measure relative humidity? – Hygrometer
52. What is the SI unit of momentum? – kg·m/s
53. Who is known as the Father of Nuclear Physics? – Ernest Rutherford
54. What is the SI unit of luminous
intensity? – Candela (cd)
55. What is the SI unit of magnetic flux? – Weber (WB)
Practice questions 56-85
56. What is the SI unit of temperature? – Kelvin (K)
57. What is the SI unit of density? – kg/m³
58. Which type of energy is produced from sunlight? – Solar energy
59. What is the SI unit of electric field? – Newton per coulomb (N/C)
60. Who discovered the electron? – J. J. Thomson
61. What is the SI unit of angular momentum? – kg·m²/s
62. Which type of mirror is used in solar cookers? – Concave mirror
63. What is the SI unit of capacitance? – Farad (F)
64. Which instrument is used to measure blood pressure? – Sphygmomanometer
65. Which law explains the buoyant force? – Archimedes’ Principle
66. Which is the only planet that rotates on its side? – Uranus
67. What is the SI unit of torque? – Newton metre (N·m)
68. What is the unit of Planck’s constant? – Joule second (J·s)
69. What type of energy is stored in food? – Chemical energy
70. Which scientist is associated with the laws of planetary motion? – Johannes Kepler
71. What is the SI unit of induction? – Henry (H)
72. What is the SI unit of sound intensity? – Decibel (dB)
73. Which force keeps planets in orbit around the Sun? – Gravitational force
74. Which phenomenon explains the bending of light? – Refraction
75. Which phenomenon explains the splitting of white light into colors? – Dispersion
76. Which type of energy is associated with motion? – Kinetic energy
77. What is the SI unit of heat? – Joule (J)
78. Which law states that “the volume of a gas is inversely proportional to pressure”? – Boyle’s Law
79. Which instrument is used to measure humidity? – Hygrometer
80. Which is the heaviest planet in the solar system? – Jupiter
81. Which scientist developed the theory of relativity? – Albert Einstein
82. What is the SI unit of electric power? – Watt (W)
83. Which type of energy is used in nuclear power plants? – Nuclear energy
84. Which phenomenon explains the twinkling of stars? – Atmospheric refraction
85. Which is the fastest known particle? – Photon
Practice questions 86-116
86. Which scientist invented the steam engine? – James Watt
87. Which device is used to measure speed of a vehicle? – Speedometer
88. What is the SI unit of electric conductance? – Siemens (S)
89. Which type of energy is stored in a battery? – Chemical energy
90. Which instrument is used to measure wind speed? – Anemometer
91. What is the SI unit of electric potential? – Volt (V)
92. Which instrument is used to measure altitude? – Altimeter
93. What is the SI unit of electric flux? – Volt metre (V·m)
94. Which scientist gave the law of electromagnetic induction? – Michael Faraday
96. Which is the hardest natural material? – Diamond
97. Which type of energy is possessed by water stored in a dam? – Potential energy
98. What is the SI unit of illumination? – Lux
99. What is the SI unit of radiation dose? – Gray (Gy)
100. Which phenomenon makes a pencil appear bent in water? – Refraction
101. Which instrument is used to measure gas pressure? – Manometer
102. Which energy is produced by moving water? – Hydroelectric energy
103. What is the SI unit of magnetic field strength? – Tesla (T)
104. Which instrument is used to measure electric power? – Wattmeter
105. Which scientist developed the concept of quantum mechanics? – Max Planck
106. What is the SI unit of inductance? – Henry (H)
107. What is the unit of gravitational constant (G)? – N·m²/kg²
108. Which type of wave is sound? – Longitudinal wave
109. What is the SI unit of pressure energy? – Pascal (Pa)
110. Which scientist invented the dynamo? – Michael Faraday
111. Which phenomenon causes the sky to appear blue? – Scattering of light
112. Which device is used to measure current and voltage both? – Multimeter
113. What is the SI unit of angular frequency? – rad/s
114. Which energy is released in an atomic bomb? – Nuclear energy
115. Which law explains the relationship between pressure, volume, and temperature of gases? – Gas Laws
(Combined Gas Law)
116. Which planet has the strongest magnetic field? – Jupiter
Practice questions 117-147
117. Which law explains why we wear seatbelts? – Newton’s First Law of Motion
118. Which instrument is used to measure temperature? – Thermometer
119. What is the speed of light in vacuum? – 3 × 10⁸ m/s
120. Which type of mirror is used in car rear-view mirrors? – Convex mirror
121. What is the SI unit of frequency? – Hertz (Hz)
122. Which device is used to convert solar energy into electricity? – Solar cell
123. Which scientist discovered X-rays? – Wilhelm Roentgen
124. What is the SI unit of electric charge? – Coulomb (C)
125. Which type of lens is used to correct short-sightedness? – Concave lens
126. Which type of lens is used to correct long-sightedness? – Convex lens
127. Which law explains why rockets move? – Newton’s Third Law of Motion
128. What is the SI unit of energy? – Joule (J)
129. Which scientist discovered the neutron? – James Chadwick
130. Which type of current is used in homes? – Alternating Current (AC)
132. What is the SI unit of resistance? – Ohm (Ω)
133. Which scientist discovered the electron? – J. J. Thomson
134. What is the unit of power? – Watt (W)
135. Which mirror is used in torch lights? – Concave mirror
136. What is the unit of work done? – Joule (J)
137. Which scientist discovered the law of gravitation? – Isaac Newton
138. Which type of energy is produced by a moving fan? – Kinetic energy
139. Which scientist discovered radioactivity? – Henri Becquerel
140. Which device is used to measure humidity? – Hygrometer
141. What is the SI unit of sound intensity? – Decibel (dB)
142. Which scientist discovered protons? – Ernest Rutherford
143. Which type of wave is light? – Transverse wave
144. Which device is used to measure electric current? – Ammeter
145. What is the SI unit of pressure? – Pascal (Pa)
146. Which device is used to s
tore electric charge? – Capacitor
147. What is the SI unit of force? – Newton (N)
Important questions and their answers related to natural science.
Earth Science & Astronomy
Chemistry
Physics
Biology..........👇
