WBCS physics
January 27, 2025
0
1. The SI unit of magnetic flux is:
(A) Weber
(B) Tesla
(C) Henry
(D) Farad
Answer: (A) Weber
2. In a diode, the direction of current flow is:
(A) Cathode to Anode
(B) Anode to Cathode
(C) Both directions
(D) Does not conduct current
Answer: (B) Anode to Cathode
3. The velocity of sound is maximum in:
(A) Air
(B) Water
(C) Steel
(D) Vacuum
Answer: (C) Steel
4. In the photoelectric effect, the stopping potential depends on:
(A) Intensity of incident light
(B) Frequency of incident light
(C) Both intensity and frequency
(D) None of the above
Answer: (B) Frequency of incident light
5. A moving coil galvanometer works on the principle of:
(A) Faraday’s Law
(B) Ampere’s Law
(C) Torque on a current-carrying loop in a magnetic field
(D) Lenz’s Law
Answer: (C) Torque on a current-carrying loop in a magnetic field
6. The minimum energy required to remove an electron from the outermost shell of an atom is called:
(A) Work function
(B) Ionization energy
(C) Binding energy
(D) Electron affinity
Answer: (B) Ionization energy
7. Which of the following waves is used for communication by artificial satellites?
(A) Microwave
(B) Radio wave
(C) Infrared wave
(D) Ultraviolet wave
Answer: (A) Microwave
8. The principle of conservation of angular momentum explains:
(A) Why a skater spins faster when pulling in their arms
(B) Why a ball rolls down a slope
(C) The lift of an airplane
(D) The refraction of light
Answer: (A) Why a skater spins faster when pulling in their arms
9. What is the approximate escape velocity from Earth's surface?
(A) 7.9 m/s
(B) 11.2 m/s
(C) 11.2 km/s
(D) 7.9 km/s
Answer: (C) 11.2 km/s
10. The refractive index of a medium depends on:
(A) Frequency of light
(B) Wavelength of light
(C) Speed of light in the medium
(D) All of the above
Answer: (D) All of the above
11. Which one of the following statements is correct about entropy?
(A) Entropy is the measure of work done by a system.
(B) Entropy is the measure of heat energy in a system.
(C) Entropy is the measure of randomness or disorder of a system.
(D) Entropy is constant for an irreversible process.
Answer: (C) Entropy is the measure of randomness or disorder of a system.
12. What type of mirror is used in car rear-view mirrors?
(A) Plane mirror
(B) Convex mirror
(C) Concave mirror
(D) Parabolic mirror
Answer: (B) Convex mirror
13. Which metal is the best conductor of electricity?
(A) Gold
(B) Silver
(C) Copper
(D) Aluminum
Answer: (B) Silver
14. Which type of electromagnetic radiation has the highest energy?
(A) Infrared
(B) Ultraviolet
(C) X-rays
(D) Gamma rays
Answer: (D) Gamma rays
15. The efficiency of a Carnot engine depends on:
(A) Working substance
(B) Heat supplied
(C) Temperature difference between source and sink
(D) Mechanical design
Answer: (C) Temperature difference between source and sink
16. The motion of planets around the Sun is explained by:
(A) Newton’s First Law
(B) Newton’s Second Law
(C) Newton’s Law of Gravitation
(D) Kepler’s Laws of Planetary Motion
Answer: (D) Kepler’s Laws of Planetary Motion
17. Which of the following is a renewable source of energy?
(A) Natural gas
(B) Coal
(C) Solar energy
(D) Nuclear energy
Answer: (C) Solar energy
18. What happens to the pressure of a gas when its volume is halved at constant temperature?
(A) Pressure becomes half
(B) Pressure becomes double
(C) Pressure remains the same
(D) Pressure becomes four times
Answer: (B) Pressure becomes double
19. Which property of light is responsible for the formation of shadows?
(A) Diffraction
(B) Reflection
(C) Rectilinear propagation
(D) Polarization
Answer: (C) Rectilinear propagation
20. The chemical formula of ozone is:
(A) O₂
(B) O₃
(C) O⁻
(D) O₂⁻
Answer: (B) O₃
21. The main component of biogas is:
(A) Carbon dioxide
(B) Methane (Correct Answer)
(C) Nitrogen
(D) Oxygen
22. Which law explains the rise of liquid in a capillary tube?
(A) Bernoulli’s Law
(B) Pascal’s Law
(C) Stoke’s Law
(D) Jurin’s Law (Correct Answer)
23. Which physical quantity is scalar?
(A) Velocity
(B) Acceleration
(C) Power (Correct Answer)
(D) Force
**24. In a P-N junction, the depletion region
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Here’s the quiz (21 to 50) with options and answers highlighted in bold:
21. The main component of biogas is:
(A) Carbon dioxide
(B) Methane
(C) Nitrogen
(D) Oxygen
22. Which law explains the rise of liquid in a capillary tube?
(A) Bernoulli’s Law
(B) Pascal’s Law
(C) Stoke’s Law
(D) Jurin’s Law
23. Which physical quantity is scalar?
(A) Velocity
(B) Acceleration
(C) Power
(D) Force
24. In a P-N junction, the depletion region acts as:
(A) A conductor
(B) An insulator
(C) A semiconductor
(D) A superconductor
25. The function of a moderator in a nuclear reactor is to:
(A) Absorb neutrons
(B) Slow down neutrons
(C) Generate heat
(D) Accelerate neutrons
26. Which of the following is not a fundamental force of nature?
(A) Gravitational force
(B) Electromagnetic force
(C) Frictional force
(D) Strong nuclear force
27. Which type of lens is used to correct myopia (short-sightedness)?
(A) Convex lens
(B) Concave lens
(C) Cylindrical lens
(D) Bifocal lens
28. What is the angle between electric and magnetic fields in an electromagnetic wave?
(A) 0°
(B) 45°
(C) 90°
(D) 180°
29. A transformer works on the principle of:
(A) Self-induction
(B) Mutual induction
(C) Faraday’s Law of Electrolysis
(D) Lenz’s Law
30. What is the role of dielectric in a capacitor?
(A) Decreases capacitance
(B) Increases capacitance
(C) Reduces voltage
(D) Increases resistance
31. The material used for making the filament of a bulb is:
(A) Copper
(B) Aluminum
(C) Tungsten
(D) Nichrome
32. The boiling point of water at high altitude is:
(A) Higher than at sea level
(B) Lower than at sea level
(C) Same as at sea level
(D) Unaffected by altitude
33. Heat transfer in fluids primarily occurs by:
(A) Conduction
(B) Convection
(C) Radiation
(D) Reflection
34. Which gas is primarily responsible for the greenhouse effect?
(A) Oxygen
(B) Methane
(C) Carbon dioxide
(D) Hydrogen
35. The audible range of sound for humans is:
(A) 10 – 10,000 Hz
(B) 20 – 20,000 Hz
(C) 1 – 1,000 Hz
(D) 50 – 5,000 Hz
36. A concave lens always forms:
(A) Virtual and diminished
(B) Real and diminished
(C) Virtual and enlarged
(D) Real and enlarged
37. The SI unit of pressure is:
(A) Newton
(B) Joule
(C) Pascal
(D) Tesla
38. Alternating current is transmitted to distant places at:
(A) High voltage and low current
(B) High voltage and high current
(C) Low voltage and low current
(D) Low voltage and high current
39. Hydraulic press works on:
(A) Archimedes’ Law
(B) Pascal’s Law
(C) Reynold’s Law
(D) Bernoulli’s Law
40. The velocity profile of a liquid flowing through a capillary is:
(A) Straight line
(B) Circular arc
(C) Hyperbolic
(D) Parabolic
41. ‘RADAR’ stands for:
(A) Radio Detection and Ranging
(B) Ready Advanced Appliance for Ranging
(C) Range Detection Appliance for Airplane Ranging
(D) Ready Advanced Airplane Ranging
42. Human ear is most sensitive to sound frequencies between:
(A) 100 – 500 Hz
(B) 500 – 5,000 Hz
(C) 5,000 – 10,000 Hz
(D) 10,000 – 20,000 Hz
43. The blueness of the sky is mainly due to:
(A) Scattering of sunlight by air molecules
(B) Presence of water vapor
(C) Absorption of blue light by the air
(D) Emission of blue light by the atmosphere
44. The pressure gauge required for measuring high pressure of the order of 10⁵ Psi is:
(A) U-Tube manometer
(B) Bourdon pressure gauge
(C) McLeod gauge
(D) Pirani gauge
45. In an N-type semiconductor, ultrapure Si is doped with:
(A) Boron
(B) Aluminum
(C) Phosphorus
(D) Indium
46. A light-emitting diode (LED) produces light when:
(A) Reverse biased
(B) Forward biased
(C) Unbiased
(D) None of the above
47. LED and LASER diodes are made of:
(A) Aluminum
(B) Gallium
(C) Arsenic
(D) Gallium Arsenide (GaAs)
48. Electrical resistivity of a conductor:
(A) Increases with temperature
(B) Decreases with temperature
(C) Does not change with temperature
(D) Decreases at lower temperature, then increases
49. Pascal is a unit of:
(A) Air pressure
(B) Pressure
(C) Viscosity
(D) Distance
50. An electric motor:
(A) Generates mechanical energy
(B) Generates electric energy
(C) Converts mechanical energy into electrical energy
(D) Stores electrical energy
51. The SI unit of magnetic flux is:
(A) Tesla
(B) Weber
(C) Gauss
(D) Henry
52. The instrument used to measure atmospheric pressure is:
(A) Hygrometer
(B) Thermometer
(C) Pyrometer
(D) Barometer
53. A virtual image is always:
(A) Inverted and real
(B) Diminished and real
(C) Erect and imaginary
(D) Erect and real
54. The speed of sound is maximum in:
(A) Air
(B) Water
(C) Steel
(D) Vacuum
55. Which of the following is a vector quantity?
(A) Energy
(B) Power
(C) Force
(D) Work
56. The escape velocity on Earth is approximately:
(A) 11.2 km/s
(B) 9.8 km/s
(C) 13.6 km/s
(D) 7.9 km/s
57. Which gas is most abundant in the Earth’s atmosphere?
(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Argon
58. The term used for the heat required to change a solid into liquid is:
(A) Heat capacity
(B) Latent heat
(C) Specific heat
(D) Heat of reaction
59. A device used to measure electric current is called:
(A) Voltmeter
(B) Ammeter
(C) Ohmmeter
(D) Galvanometer
60. What is the wavelength range of ultraviolet (UV) rays?
(A) 200-400 nm
(B) 100-200 nm
(C) 10-400 nm
(D) 400-700 nm
61. Electric current in a metallic conductor is due to:
(A) Positive ions
(B) Negative ions
(C) Protons
(D) Electrons
62. Which of the following is used as a coolant in nuclear reactors?
(A) Carbon dioxide
(B) Liquid sodium
(C) Heavy water
(D) Graphite
63. The minimum energy required to remove an electron from an atom is called:
(A) Kinetic energy
(B) Work function
(C) Ionization energy
(D) Activation energy
64. The principle of the conservation of energy is based on:
(A) Newton’s laws
(B) The first law of thermodynamics
(C) The second law of thermodynamics
(D) The third law of thermodynamics
65. The magnetic field strength at the center of a current-carrying circular coil is:
(A) Proportional to its radius
(B) Proportional to the square of its radius
(C) Inversely proportional to its radius
(D) Inversely proportional to the square of its radius
66. Which type of mirror is used in rearview mirrors of vehicles?
(A) Plane mirror
(B) Concave mirror
(C) Convex mirror
(D) Parabolic mirror
67. The resistance of a conductor depends on:
(A) Length of the conductor
(B) Area of the cross-section
(C) Material of the conductor
(D) All of the above
68. Which of the following is an example of a renewable energy source?
(A) Coal
(B) Petroleum
(C) Solar energy
(D) Natural gas
69. The device used to convert solar energy into electrical energy is called:
(A) Transformer
(B) Generator
(C) Solar cell
(D) Capacitor
70. Which is the lightest particle?
(A) Proton
(B) Neutron
(C) Electron
(D) Alpha particle
71. In the electromagnetic spectrum, X-rays have wavelengths shorter than:
(A) Infrared waves
(B) Visible light
(C) Ultraviolet waves
(D) All of the above
72. The unit of capacitance is:
(A) Henry
(B) Joule
(C) Farad
(D) Tesla
73. The specific resistance of a wire depends on:
(A) Length of the wire
(B) Material of the wire
(C) Area of the wire
(D) Material and temperature
74. The mass of an electron is approximately:
(A) 1.67 × 10⁻²⁷ kg
(B) 9.1 × 10⁻³¹ kg
(C) 1.67 × 10⁻²⁴ kg
(D) 1.6 × 10⁻¹⁹ kg
75. Which phenomenon is responsible for the twinkling of stars?
(A) Reflection
(B) Diffraction
(C) Atmospheric refraction
(D) Polarization
76. A proton has a charge of:
(A) 1.6 × 10⁻¹⁹ C
(B) +1.6 × 10⁻¹⁹ C
(C) -1.6 × 10⁻¹⁹ C
(D) 0 C
77. In which medium does light travel the fastest?
(A) Water
(B) Air
(C) Vacuum
(D) Glass
78. The Doppler effect is related to the:
(A) Reflection of waves
(B) Refraction of waves
(C) Interference of waves
(D) Change in frequency due to motion
79. Which of the following is not a property of magnetic field lines?
(A) They form closed loops
(B) They never intersect
(C) They are directed from south to north outside the magnet
(D) They are directed from south to north inside the magnet
80. The property of a substance to regain its original shape after deformation is called:
(A) Ductility
(B) Plasticity
(C) Elasticity
(D) Malleability
81. The SI unit of temperature is:
(A) Celsius
(B) Fahrenheit
(C) Kelvin
(D) Joule
82. The boiling point of water in Kelvin is:
(A) 273 K
(B) 100 K
(C) 373 K
(D) 212 K
83. Which device is used to store electrical energy?
(A) Resistor
(B) Capacitor
(C) Inductor
(D) Transformer
84. The value of acceleration due to gravity (g) on the Moon is:
(A) 1/6th of that on Earth
(B) Same as that on Earth
(C) 6 times that on Earth
(D) Zero
85. The SI unit of power is:
(A) Joule
(B) Newton
(C) Watt
(D) Watt
86. Contact angle of mercury with glass is:
(A) 0°
(B) 90°
(C) <90°
(D) >90°
87. The unit of frequency is:
(A) Decibel
(B) Tesla
(C) Hertz
(D) Candela
88. Heat always flows from:
(A) Lower temperature to higher temperature
(B) Higher temperature to lower temperature
(C) Depends on the medium
(D) Both (A) and (B)
89. Which planet is closest to the Sun?
(A) Earth
(B) Venus
(C) Mars
(D) Mercury
90. The process of splitting of a heavy nucleus into smaller nuclei is called:
(A) Fusion
(B) Diffusion
(C) Fission
(D) Emission
91. The law of inertia is also called:
(A) Newton’s first law
(B) Newton’s second law
(C) Newton’s third law
(D) Galileo’s law
92. The main constituent of the Sun is:
(A) Oxygen
(B) Helium
(C) Hydrogen
(D) Carbon
93. Which type of mirror is used in headlights of cars?
(A) Plane mirror
(B) Convex mirror
(C) Concave mirror
(D) Parabolic mirror
94. The intensity of an earthquake is measured on which scale?
(A) Kelvin scale
(B) Richter scale
(C) Decibel scale
(D) Beaufort scale
95. Which instrument is used to measure humidity?
(A) Hygrometer
(B) Pyrometer
(C) Barometer
(D) Hygrometer
96. The bending of light around the corners of an obstacle is called:
(A) Reflection
(B) Refraction
(C) Diffraction
(D) Diffraction
97. The property of a body to resist any change in its state of rest or motion is called:
(A) Force
(B) Energy
(C) Inertia
(D) Momentum
98. A transformer cannot work with:
(A) Direct current
(B) Alternating current
(C) Direct current
(D) Voltage fluctuation
99. The heat required to raise the temperature of a body by 1 K is called:
(A) Specific heat
(B) Latent heat
(C) Heat capacity
(D) Heat of fusion
100. Which of the following is a scalar quantity?
(A) Momentum
(B) Acceleration
(C) Temperature
(D) Force
101. The S.I. unit of pressure is:
(A) Bar
(B) Dyne/cm²
(C) Torr
(D) Pascal (Pa)
102. What is the charge of a neutron?
(A) Positive
(B) Negative
(C) Neutral
(D) None of the above
103. The time period of a pendulum depends on:
(A) Mass of the bob
(B) Length of the string
(C) Amplitude of swing
(D) All of the above
104. The splitting of white light into its constituent colors is called:
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Diffraction
105. The boiling point of water decreases when:
(A) The temperature increases
(B) The pressure decreases
(C) The pressure increases
(D) None of the above
106. The unit of electric charge is:
(A) Joule
(B) Volt
(C) Coulomb
(D) Ampere
107. A device used to measure potential difference is called:
(A) Voltmeter
(B) Ammeter
(C) Ohmmeter
(D) Multimeter
108. Which law states that "current is directly proportional to voltage"?
(A) Kirchhoff’s law
(B) Coulomb’s law
(C) Ohm’s law
(D) Faraday’s law
109. In a vacuum, all electromagnetic waves have the same:
(A) Wavelength
(B) Speed
(C) Frequency
(D) Energy
110. The heat required to convert a liquid into vapor without changing its temperature is called:
(A) Specific heat
(B) Latent heat of vaporization
(C) Heat capacity
(D) Sensible heat
111. In which of the following materials does sound travel the fastest?
(A) Air
(B) Water
(C) Iron
(D) Glass
112. A concave lens always forms an image that is:
(A) Real and inverted
(B) Real and erect
(C) Virtual and erect
(D) Virtual and inverted
113. The process by which a solid changes directly to a gas is called:
(A) Condensation
(B) Sublimation
(C) Vaporization
(D) Fusion
114. What is the formula for kinetic energy?
(A) mv
(B) 1/2 mv²
(C) mgh
(D) mv²
115. The density of water is maximum at:
(A) 0°C
(B) 4°C
(C) 10°C
(D) 100°C
116. The property of liquids to rise in a thin tube is called:
(A) Viscosity
(B) Surface tension
(C) Capillarity
(D) Adhesion
117. In an AC circuit, the device used to increase or decrease voltage is called:
(A) Inductor
(B) Transformer
(C) Rectifier
(D) Resistor
118. What is the primary function of a fuse in an electrical circuit?
(A) To store energy
(B) To prevent overloading
(C) To increase voltage
(D) To regulate current
119. What type of waves are sound waves?
(A) Transverse
(B) Longitudinal
(C) Electromagnetic
(D) Stationary
120. The bending of light when it passes through a prism is due to:
(A) Reflection
(B) Interference
(C) Refraction
(D) Diffraction
121. In nuclear reactors, the substance used to slow down neutrons is called:
(A) Coolant
(B) Moderator
(C) Control rod
(D) Reflector
122. What is the value of 1 electron volt in joules?
(A) 1.6 × 10⁻¹⁹ J
(B) 9.1 × 10⁻³¹ J
(C) 1.67 × 10⁻²⁷ J
(D) 3.2 × 10⁻¹⁹ J
123. The filament of an electric bulb is made of:
(A) Copper
(B) Iron
(C) Tungsten
(D) Aluminum
124. The critical angle occurs when:
(A) Light is refracted
(B) Light is internally reflected
(C) Light is absorbed
(D) Light is scattered
125. The term "Mach number" is associated with:
(A) Heat transfer
(B) Fluid mechanics
(C) Speed of sound
(D) Electric charge
126. The element used in a pencil is:
(A) Graphite
(B) Carbon
(C) Lead
(D) Silicon
127. Light year is a unit of:
(A) Time
(B) Distance
(C) Light intensity
(D) Speed
128. The process by which plants make their own food is called:
(A) Respiration
(B) Transpiration
(C) Photosynthesis
(D) Digestion
129. The SI unit of force is:
(A) Dyne
(B) Joule
(C) Newton
(D) Pascal
130. Which element is the best conductor of electricity?
(A) Iron
(B) Silver
(C) Copper
(D) Aluminum
131. The freezing point of pure water is:
(A) 0°C
(B) 100°C
(C) 273 K
(D) Both A and C
132. The instrument used to measure small electric currents is:
(A) Voltmeter
(B) Galvanometer
(C) Ammeter
(D) Multimeter
133. The frequency of an alternating current in India is:
(A) 40 Hz
(B) 50 Hz
(C) 60 Hz
(D) 75 Hz
134. The Newton is a unit of:
(A) Work
(B) Power
(C) Force
(D) Energy
135. What causes tides in the ocean?
(A) The Earth’s rotation
(B) The gravitational pull of the Moon and Sun
(C) Wind
(D) Ocean currents
136. Which lens is used to correct myopia (nearsightedness)?
(A) Convex lens
(B) Concave lens
(C) Cylindrical lens
(D) Bifocal lens
137. The image formed by a plane mirror is:
(A) Real, inverted, and same size
(B) Virtual, inverted, and magnified
(C) Real, erect, and diminished
(D) Virtual, erect, and same size
138. The unit of luminous intensity is:
(A) Candela
(B) Lumen
(C) Candela
(D) Lux
139. The movement of heat through a solid material is called:
(A) Convection
(B) Conduction
(C) Radiation
(D) None of the above
140. The Earth's magnetic field protects us from:
(A) Earthquakes
(B) Tides
(C) Solar winds
(D) Volcanoes
141. What is the SI unit of energy?
(A) Watt
(B) Joule
(C) Newton
(D) Kilogram
142. Planets move around the Sun in:
(A) Circular orbits
(B) Elliptical orbits
(C) Spiral paths
(D) Random paths
143. The rate of change of velocity is called:
(A) Speed
(B) Displacement
(C) Force
(D) Acceleration
144. The instrument used to measure earthquake intensity is called:
(A) Barometer
(B) Pyrometer
(C) Seismograph
(D) Anemometer
145. The device that converts mechanical energy into electrical energy is:
(A) Motor
(B) Transformer
(C) Generator
(D) Inductor
146. Which of the following is a scalar quantity?
(A) Force
(B) Velocity
(C) Acceleration
(D) Energy
147. What is the color of the sky due to Rayleigh scattering?
(A) Red
(B) Green
(C) Blue
(D) Yellow
148. The largest planet in the Solar System is:
(A) Earth
(B) Jupiter
(C) Saturn
(D) Neptune
149. In which process is energy released by the Sun?
(A) Fission
(B) Fusion
(C) Combustion
(D) Radiation
150. Which type of electromagnetic wave has the shortest wavelength?
(A) Ultraviolet
(B) Infrared
(C) Gamma rays
(D) X-rays
151. What is the source of the Sun’s energy?
(A) Fission
(B) Fusion
(C) Combustion
(D) Radiation
152. The bending of light around corners is called:
(A) Reflection
(B) Refraction
(C) Diffraction
(D) Dispersion
153. What is the SI unit of power?
(A) Joule
(B) Newton
(C) Watt
(D) Pascal
154. An instrument used to measure atmospheric pressure is called:
(A) Anemometer
(B) Barometer
(C) Hydrometer
(D) Pyrometer
155. Which gas is most abundant in Earth's atmosphere?
(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Argon
156. What is the boiling point of water at standard atmospheric pressure?
(A) 50°C
(B) 100°C
(C) 150°C
(D) 200°C
157. What happens to the pressure in a fluid at greater depths?
(A) It decreases
(B) It increases
(C) It remains constant
(D) It fluctuates
158. What is the unit of frequency?
(A) Newton
(B) Joule
(C) Hertz
(D) Tesla
159. Which law relates the pressure, volume, and temperature of an ideal gas?
(A) Ohm's law
(B) Coulomb’s law
(C) Ideal gas law
(D) Snell's law
160. Who discovered the electron?
(A) Isaac Newton
(B) J.J. Thomson
(C) Ernest Rutherford
(D) Niels Bohr
161. A device used to measure humidity is called:
(A) Barometer
(B) Hygrometer
(C) Anemometer
(D) Thermometer
162. The splitting of atoms to release energy is called:
(A) Fusion
(B) Fission
(C) Combustion
(D) Evaporation
163. The property of a material that allows it to regain its shape after deformation is called:
(A) Plasticity
(B) Ductility
(C) Elasticity
(D) Malleability
164. The speed of light in vacuum is approximately:
(A) 3 × 10⁸ m/s
(B) 3 × 10⁶ m/s
(C) 3 × 10⁴ m/s
(D) 3 × 10² m/s
165. The resistance of a wire depends on:
(A) Its length
(B) Its cross-sectional area
(C) The material of the wire
(D) All of the above
166. Which of the following waves are used in radar systems?
(A) Sound waves
(B) Infrared waves
(C) Microwaves
(D) Ultraviolet waves
167. What is the unit of magnetic flux?
(A) Tesla
(B) Weber
(C) Henry
(D) Gauss
168. The energy of a photon is directly proportional to its:
(A) Wavelength
(B) Amplitude
(C) Frequency
(D) Speed
169. The process of heat transfer in solids is mainly through:
(A) Convection
(B) Radiation
(C) Conduction
(D) None of the above
170. What is the S.I. unit of capacitance?
(A) Volt
(B) Ampere
(C) Farad
(D) Joule
171. In a chemical reaction, the substances that are formed are called:
(A) Reactants
(B) Products
(C) Catalysts
(D) Intermediates
172. What is the phenomenon of producing electric current in a conductor by changing the magnetic field around it?
(A) Magnetic flux
(B) Electromagnetic induction
(C) Electrostatics
(D) Thermoelectric effect
173. Which gas is used in balloons to make them float?
(A) Hydrogen
(B) Oxygen
(C) Helium
(D) Carbon dioxide
174. Which of the following is NOT a greenhouse gas?
(A) Water vapor
(B) Methane
(C) Nitrogen
(D) Carbon dioxide
175. Which planet is known as the "Red Planet"?
(A) Mercury
(B) Venus
(C) Mars
(D) Jupiter
176. What is the approximate age of the Earth?
(A) 1 billion years
(B) 2 billion years
(C) 4.5 billion years
(D) 10 billion years
177. A rainbow is formed due to:
(A) Reflection of light
(B) Refraction of light
(C) Dispersion of light
(D) All of the above
178. Which device is used to store electric charge?
(A) Transformer
(B) Resistor
(C) Capacitor
(D) Inductor
179. Which type of mirror is used in car rearview mirrors?
(A) Plane mirror
(B) Convex mirror
(C) Concave mirror
(D) Cylindrical mirror
180. The energy required to remove an electron from an atom is called:
(A) Kinetic energy
(B) Potential energy
(C) Ionization energy
(D) Activation energy
181. The most abundant element in the universe is:
(A) Oxygen
(B) Hydrogen
(C) Carbon
(D) Nitrogen
182. The motion of a freely falling body under gravity is an example of:
(A) Uniform motion
(B) Uniformly accelerated motion
(C) Simple harmonic motion
(D) Circular motion
183. The chemical formula of ozone is:
(A) O
(B) O₂
(C) O₃
(D) O₄
184. What is the unit of electric potential?
(A) Volt
(B) Ampere
(C) Ohm
(D) Coulomb
185. The presence of which gas in the atmosphere causes acid rain?
(A) Carbon dioxide
(B) Sulfur dioxide
(C) Hydrogen
(D) Methane
186. The shape of a liquid drop is spherical due to:
(A) Viscosity
(B) Adhesion
(C) Surface tension
(D) Capillarity
187. The primary colors of light are:
(A) Red, Green, Yellow
(B) Red, Green, Blue
(C) Red, Yellow, Blue
(D) Green, Blue, Violet
188. What is the function of a diode in a circuit?
(A) To amplify current
(B) To produce current
(C) To allow current in one direction
(D) To block all current
189. Which law explains the relationship between current, voltage, and resistance?
(A) Newton’s law
(B) Ohm’s law
(C) Coulomb’s law
(D) Faraday’s law
190. Which planet is known as the "Morning Star"?
(A) Mercury
(B) Mars
(C) Venus
(D) Jupiter
191. An electric current produces:
(A) Heat
(B) Magnetic field
(C) Light
(D) All of the above
192. What is the approximate pH of pure water?
(A) 7
(B) 4
(C) 9
(D) 5
193. Which wave has the highest frequency in the electromagnetic spectrum?
(A) X-rays
(B) Gamma rays
(C) Infrared
(D) Ultraviolet
194. A substance that speeds up a chemical reaction without being consumed is called a:
(A) Solvent
(B) Reactant
(C) Catalyst
(D) Product
195. The region around a magnet where its influence can be felt is called:
(A) Electric field
(B) Magnetic moment
(C) Magnetic pole
(D) Magnetic field
196. Which gas is used in fire extinguishers?
(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Helium
197. The splitting of light into its seven constituent colors is called:
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Diffraction
198. What is the approximate escape velocity from Earth?
(A) 5 km/s
(B) 11 km/s
(C) 15 km/s
(D) 20 km/s
199. The ability of a substance to be drawn into a thin wire is called:
(A) Malleability
(B) Ductility
(C) Elasticity
(D) Plasticity
200. The process of removing salt from seawater is called:
(A) Distillation
(B) Desalination
(C) Filtration
(D) Sedimentation
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