The moment of inertia of a body depends on – (A) Mass only (B) Axis of rotation (C) Speed of rotation (D) Gravity Answer: (B)
A PN junction diode is mainly used for – (A) Amplification (B) Rectification (C) Oscillation (D) Modulation Answer: (B)
The velocity of sound in air at room temperature is approximately – (A) 220 m/s (B) 330 m/s (C) 440 m/s (D) 500 m/s Answer: (B)
Fleming’s Left-Hand Rule is used to determine – (A) Direction of electric field (B) Direction of magnetic field (C) Direction of force on a conductor (D) Direction of flow in transformers Answer: (C)
X-rays were discovered by – (A) Roentgen (B) Becquerel (C) Curie (D) Thomson Answer: (A)
Electromagnetic waves do not require – (A) Medium (B) Frequency (C) Amplitude (D) Speed Answer: (A)
A neutral object becomes charged by – (A) Repulsion (B) Friction (C) Inertia (D) Conduction Answer: (B)
In nuclear fission, the total mass of the products is – (A) Equal to original mass (B) Greater than original (C) Less than original (D) Same with different state Answer: (C)
A solar eclipse occurs when – (A) Earth comes between Sun and Moon (B) Moon comes between Earth and Sun (C) Moon comes behind the Sun (D) Earth moves behind the Moon Answer: (B)
The most penetrating radiation is – (A) Ultraviolet (B) Alpha (C) Beta (D) Gamma Answer: (D)
Ampere’s circuital law relates magnetic field with – (A) Voltage (B) Current (C) Resistance (D) Power Answer: (B)
In simple harmonic motion, acceleration is maximum at – (A) Mean position (B) Maximum displacement (C) Half amplitude (D) Center Answer: (B)
The thermometric property of a thermometer is – (A) Mass (B) Color (C) Length of mercury column (D) Pressure Answer: (C)
Superconductivity is a state of – (A) Infinite resistance (B) Zero resistance (C) High voltage (D) Zero charge Answer: (B)
Ohm’s law is not valid for – (A) Metals (B) Insulators (C) Semiconductors (D) Non-linear devices Answer: (D)
Work done is zero when – (A) Force acts perpendicular to displacement (B) No force acts (C) No displacement occurs (D) All of the above Answer: (D)
The loudness of sound is proportional to – (A) Frequency (B) Wavelength (C) Amplitude squared (D) Speed Answer: (C)
The cooling in desert at night is due to – (A) Radiation (B) Convection (C) Evaporation (D) Reflection Answer: (A)
The direction of induced current is given by – (A) Ohm’s law (B) Lenz’s law (C) Fleming’s right-hand rule (D) Kirchhoff’s law Answer: (B)
Latent heat is the energy – (A) Used to increase temperature (B) Released as sound (C) Absorbed/released during change of state (D) That creates friction Answer: (C)
The coefficient of restitution is 1 for – (A) Perfect elastic collision (B) Inelastic collision (C) Explosion (D) No motion Answer: (A)
Doppler effect is applicable to – (A) Light only (B) Sound only (C) All waves (D) Only transverse waves Answer: (C)
Nuclear fusion occurs naturally in – (A) Nuclear reactor (B) Atomic bomb (C) Sun (D) Earth core Answer: (C)
Light year is the unit of – (A) Time (B) Distance (C) Speed (D) Intensity Answer: (B)
Transformer works on the principle of – (A) Static electricity (B) Mutual induction (C) Self induction (D) Rectification Answer: (B)
Which of the following is a vector quantity? (A) Pressure (B) Work (C) Velocity (D) Energy Answer: (C)
The magnetic field inside a long solenoid is – (A) Circular (B) Uniform (C) Zero (D) Tangential Answer: (B)
Ultraviolet rays can cause – (A) Cooling (B) Vitamin D synthesis (C) Heart rate increase (D) Muscle pain Answer: (B)
Curie is a unit of – (A) Magnetic field (B) Radioactivity (C) Luminous intensity (D) Temperature Answer: (B)
A light ray retraces its path when – (A) It enters vacuum (B) Incidence is normal (C) Reflection is total (D) It bends Answer: (B)
The resistance of a wire increases with – (A) Increase in length (B) Increase in area (C) Lower temperature (D) High conductivity Answer: (A)
The spring constant (k) has the unit – (A) N (B) N/m (C) m/N (D) J Answer: (B)
The SI unit of luminous intensity is – (A) Candela (B) Lumen (C) Lux (D) Candle Answer: (A)
A ball dropped from a height has – (A) Constant velocity (B) Increasing acceleration (C) Constant acceleration (D) No motion Answer: (C)
Bernoulli’s equation is applicable for – (A) Viscous flow (B) Compressible flow (C) Non-viscous, incompressible fluid (D) Laminar flow only Answer: (C)
Capacitors in series have – (A) Higher equivalent capacitance (B) Lower equivalent capacitance (C) Infinite capacitance (D) No effect Answer: (B)
One Newton is the force required to – (A) Move 1 kg by 1 meter (B) Accelerate 1 kg by 1 m/s² (C) Raise 1 kg by 1 m (D) Pull 1 kg with no friction Answer: (B)
The minimum distance to hear echo is – (A) 10 m (B) 17 m (C) 25 m (D) 50 m Answer: (B)
Sublimation is – (A) Solid to liquid (B) Solid to gas (C) Liquid to gas (D) Gas to solid Answer: (B)
Insulators are materials that – (A) Conduct electricity (B) Don’t allow current (C) Increase resistance (D) Both B and C Answer: (D)
SI unit of electric charge is – (A) Coulomb (B) Ampere (C) Farad (D) Watt Answer: (A)
A neutron has – (A) Positive charge (B) Negative charge (C) No charge (D) Double charge Answer: (C)
The focal length of a plane mirror is – (A) Zero (B) Infinite (C) Negative (D) 1 m Answer: (B)
The device to detect current is – (A) Voltmeter (B) Galvanometer (C) Ammeter (D) Rheostat Answer: (B)
Rainbow is an example of – (A) Reflection (B) Refraction (C) Dispersion (D) All of the above Answer: (D)
Heat transfer in solids takes place mainly by – (A) Conduction (B) Convection (C) Radiation (D) Reflection Answer: (A)
A body moves in circular path with constant speed but – (A) Acceleration is zero (B) Acceleration changes direction (C) Acceleration is inward (D) Both B and C Answer: (D)
The mass of an object on moon is – (A) Zero (B) Same as on Earth (C) More than on Earth (D) Double Answer: (B)
The acceleration due to gravity on moon is – (A) 9.8 m/s² (B) 1.6 m/s² (C) 6.2 m/s² (D) 4.8 m/s² Answer: (B)
A real image can be – (A) Obtained on screen (B) Virtual (C) Erect (D) Non-inverted Answer: (A)
