Q.1 Which fundamental force is responsible for holding the nucleus of an atom together?
Gravitational Force
Electromagnetic Force
Strong Nuclear Force
Weak Nuclear Force
Explanation - The strong nuclear force binds protons and neutrons in the atomic nucleus, overcoming the repulsive electromagnetic force between protons.
Correct answer is: Strong Nuclear Force
Q.2 The speed of light in a vacuum is approximately:
2 × 10^8 m/s
3 × 10^8 m/s
4 × 10^8 m/s
1.5 × 10^8 m/s
Explanation - Light travels at about 300,000 km per second in a vacuum, equivalent to 3 × 10^8 meters per second.
Correct answer is: 3 × 10^8 m/s
Q.3 What is the SI unit of electric current?
Volt
Coulomb
Ampere
Ohm
Explanation - The ampere is the SI base unit used to measure electric current.
Correct answer is: Ampere
Q.4 Who proposed the law of universal gravitation?
Galileo Galilei
Albert Einstein
Isaac Newton
Niels Bohr
Explanation - Isaac Newton formulated the law of universal gravitation, describing the gravitational attraction between masses.
Correct answer is: Isaac Newton
Q.5 Which phenomenon explains why stars appear to twinkle in the night sky?
Refraction
Diffraction
Reflection
Scattering
Explanation - Twinkling occurs due to atmospheric refraction as light passes through layers of varying air densities.
Correct answer is: Refraction
Q.6 Which particle has no electric charge?
Electron
Proton
Neutron
Positron
Explanation - Neutrons are subatomic particles with no electric charge, present in atomic nuclei along with protons.
Correct answer is: Neutron
Q.7 Which type of lens is used to correct myopia?
Convex Lens
Concave Lens
Plano-Convex Lens
Bifocal Lens
Explanation - A concave lens diverges light rays and is used to correct nearsightedness or myopia.
Correct answer is: Concave Lens
Q.8 Which law explains the relationship between voltage, current, and resistance?
Ohm's Law
Faraday's Law
Hooke's Law
Coulomb's Law
Explanation - Ohm's Law states that V = IR, where V is voltage, I is current, and R is resistance.
Correct answer is: Ohm's Law
Q.9 The value of acceleration due to gravity (g) on Earth's surface is approximately:
8.9 m/s²
9.8 m/s²
10.5 m/s²
7.8 m/s²
Explanation - The standard acceleration due to gravity at Earth's surface is 9.8 meters per second squared.
Correct answer is: 9.8 m/s²
Q.10 The energy of an object due to its motion is called:
Potential Energy
Kinetic Energy
Thermal Energy
Chemical Energy
Explanation - Kinetic energy is the energy possessed by an object due to its motion.
Correct answer is: Kinetic Energy
Q.11 X-rays are a form of:
Sound Waves
Electromagnetic Waves
Mechanical Waves
Longitudinal Waves
Explanation - X-rays are high-frequency electromagnetic waves used for imaging and diagnostics.
Correct answer is: Electromagnetic Waves
Q.12 The first law of thermodynamics is based on the principle of:
Entropy
Conservation of Mass
Conservation of Energy
Work-Energy Theorem
Explanation - The first law of thermodynamics states that energy cannot be created or destroyed, only transformed.
Correct answer is: Conservation of Energy
Q.13 What is the function of a transformer?
Increase or decrease current
Increase or decrease voltage
Convert AC to DC
Convert DC to AC
Explanation - Transformers are used to step up or step down voltage in an AC circuit.
Correct answer is: Increase or decrease voltage
Q.14 Which scientist discovered the electron?
Ernest Rutherford
J.J. Thomson
Niels Bohr
Max Planck
Explanation - J.J. Thomson discovered the electron through his cathode ray tube experiments.
Correct answer is: J.J. Thomson
Q.15 Which phenomenon is responsible for the blue color of the sky?
Reflection
Diffraction
Scattering
Polarization
Explanation - The blue color of the sky is due to Rayleigh scattering of sunlight by atmospheric particles.
Correct answer is: Scattering
Q.16 The device used to measure electric current is called:
Voltmeter
Galvanometer
Ammeter
Ohmmeter
Explanation - An ammeter is connected in series in a circuit to measure electric current.
Correct answer is: Ammeter
Q.17 What is the main source of the Sun's energy?
Combustion
Nuclear Fission
Nuclear Fusion
Chemical Reactions
Explanation - The Sun's energy is produced by nuclear fusion of hydrogen atoms into helium.
Correct answer is: Nuclear Fusion
Q.18 Which branch of physics deals with motion and forces?
Thermodynamics
Optics
Mechanics
Electrodynamics
Explanation - Mechanics is the branch of physics concerned with the motion of bodies under the influence of forces.
Correct answer is: Mechanics
Q.19 In an electric circuit, the component that opposes the flow of current is called:
Conductor
Resistor
Capacitor
Inductor
Explanation - A resistor limits or regulates the flow of electric current in a circuit.
Correct answer is: Resistor
Q.20 Which type of mirror is used in vehicle headlights?
Plane Mirror
Convex Mirror
Concave Mirror
Parabolic Mirror
Explanation - Concave mirrors focus light into a beam, making them ideal for headlights.
Correct answer is: Concave Mirror
Q.21 Which physical quantity is measured in joules?
Force
Work
Power
Momentum
Explanation - Work and energy are both measured in joules in the SI system.
Correct answer is: Work
Q.22 The time period of a simple pendulum depends on:
Length of string
Mass of bob
Amplitude of swing
Gravitational constant only
Explanation - The time period of a pendulum depends on the length of the string and acceleration due to gravity.
Correct answer is: Length of string
Q.23 The unit of electrical resistance is:
Ohm
Volt
Ampere
Watt
Explanation - The ohm (Ω) is the SI unit for measuring electrical resistance.
Correct answer is: Ohm
Q.24 Einstein's theory of relativity is based on the idea that:
Time and space are absolute
Mass and energy are unrelated
Time and space are relative
Light speed varies with motion
Explanation - Einstein proposed that space and time are interconnected and relative, forming the basis of relativity.
Correct answer is: Time and space are relative
Q.25 Which property of a wave determines its pitch?
Amplitude
Frequency
Wavelength
Velocity
Explanation - The pitch of a sound depends on the frequency of the wave; higher frequency means higher pitch.
Correct answer is: Frequency