Which of the following quantities is a scalar? (A) Acceleration (B) Force (C) Velocity (D) Work Answer: (D)
The unit of electric field is – (A) Volt (B) Volt/meter (C) Newton (D) Coulomb Answer: (B)
The phenomenon of dispersion of light is due to – (A) Reflection (B) Refraction (C) Different speeds of light in medium (D) Interference Answer: (C)
Which law states that current is directly proportional to voltage? (A) Faraday’s Law (B) Ohm’s Law (C) Lenz’s Law (D) Ampere’s Law Answer: (B)
A fuse is used in an electric circuit to – (A) Prevent shock (B) Stop leakage (C) Break the circuit when current is high (D) Reduce voltage Answer: (C)
A concave mirror forms a real, inverted image when the object is – (A) Between pole and focus (B) At the focus (C) Beyond the center of curvature (D) At the pole Answer: (C)
The SI unit of pressure is – (A) Pascal (B) Bar (C) mmHg (D) Dyne Answer: (A)
The color of the sky appears blue due to – (A) Refraction (B) Scattering (C) Reflection (D) Dispersion Answer: (B)
What happens to the frequency of a wave when it enters a denser medium? (A) Increases (B) Decreases (C) Remains the same (D) Doubles Answer: (C)
The instrument used to measure atmospheric pressure is – (A) Barometer (B) Thermometer (C) Altimeter (D) Hygrometer Answer: (A)
The phenomenon responsible for the twinkling of stars is – (A) Reflection (B) Scattering (C) Refraction (D) Diffraction Answer: (C)
Which color has the maximum wavelength in the visible spectrum? (A) Violet (B) Red (C) Green (D) Blue Answer: (B)
What type of mirror is used in vehicle side mirrors? (A) Plane (B) Concave (C) Convex (D) Cylindrical Answer: (C)
The speed of light in vacuum is approximately – (A) 3 × 10⁸ m/s (B) 3 × 10⁶ m/s (C) 3 × 10⁷ m/s (D) 3 × 10⁹ m/s Answer: (A)
Sound cannot travel through – (A) Water (B) Air (C) Vacuum (D) Steel Answer: (C)
What is the acceleration due to gravity on Earth? (A) 8.9 m/s² (B) 10.8 m/s² (C) 9.8 m/s² (D) 9.2 m/s² Answer: (C)
A body is said to be in uniform motion when – (A) Speed keeps changing (B) It covers equal distances in equal intervals of time (C) It remains stationary (D) It moves in a circle Answer: (B)
The unit of electric resistance is – (A) Ampere (B) Ohm (C) Volt (D) Farad Answer: (B)
The force that opposes motion between two surfaces is called – (A) Centripetal force (B) Normal force (C) Friction (D) Tension Answer: (C)
Escape velocity on Earth is approximately – (A) 7.9 km/s (B) 9.8 km/s (C) 11.2 km/s (D) 5.5 km/s Answer: (C)
Inertia is the tendency of a body to – (A) Accelerate (B) Resist motion (C) Remain at rest or uniform motion (D) Fall freely Answer: (C)
The force acting on a unit charge is called – (A) Voltage (B) Electric field (C) Resistance (D) Capacitance Answer: (B)
The principle of conservation of momentum is based on – (A) Newton’s First Law (B) Newton’s Second Law (C) Newton’s Third Law (D) Law of Gravitation Answer: (C)
A transformer is used to – (A) Store charge (B) Convert AC to DC (C) Increase or decrease voltage (D) Measure power Answer: (C)
Decibel is the unit for – (A) Heat (B) Sound intensity (C) Light (D) Electric charge Answer: (B)
The cooling of water in earthen pots is due to – (A) Convection (B) Radiation (C) Evaporation (D) Conduction Answer: (C)
The working principle of a hydraulic lift is based on – (A) Pascal’s Law (B) Newton’s Third Law (C) Archimedes’ Principle (D) Bernoulli’s Theorem Answer: (A)
An object immersed in water appears raised due to – (A) Reflection (B) Scattering (C) Refraction (D) Interference Answer: (C)
The latent heat of vaporization is highest for – (A) Alcohol (B) Water (C) Mercury (D) Ether Answer: (B)
Magnetic field lines – (A) Intersect each other (B) Form closed loops (C) Begin and end on poles (D) Remain straight always Answer: (B)
The resistance of a conductor depends on – (A) Length (B) Cross-sectional area (C) Material (D) All of the above Answer: (D)
Calorimeter is used to measure – (A) Temperature (B) Heat capacity (C) Light (D) Humidity Answer: (B)
The S.I. unit of frequency is – (A) Hertz (B) Newton (C) Joule (D) Tesla Answer: (A)
A body floats in water when its – (A) Weight equals buoyant force (B) Density is more than water (C) Shape is spherical (D) Volume is maximum Answer: (A)
Convex lenses are used to correct – (A) Myopia (B) Astigmatism (C) Hypermetropia (D) Cataract Answer: (C)
Ampere is the unit of – (A) Current (B) Voltage (C) Resistance (D) Work Answer: (A)
SI unit of energy is – (A) Watt (B) Joule (C) Newton (D) Volt Answer: (B)
A simple pendulum has a time period dependent on – (A) Mass (B) Amplitude (C) Length (D) Velocity Answer: (C)
The speed of sound is fastest in – (A) Air (B) Water (C) Iron (D) Vacuum Answer: (C)
A diode allows current to flow – (A) In both directions (B) In reverse direction (C) In one direction only (D) When circuit is open Answer: (C)
Magnetic field due to a straight current-carrying conductor is – (A) Rectilinear (B) Helical (C) Circular (D) Parallel Answer: (C)
Radio waves are – (A) Longest wavelength (B) Shortest wavelength (C) X-rays (D) Gamma rays Answer: (A)
Ohm’s Law fails in – (A) Superconductors (B) Semiconductors (C) Non-linear devices (D) All of the above Answer: (D)
The phenomenon of total internal reflection is used in – (A) Mirror (B) Lens (C) Optical fiber (D) Prism Answer: (C)
Hydrometer measures – (A) Humidity (B) Pressure (C) Specific gravity (D) Temperature Answer: (C)
Solar cells convert – (A) Light to heat (B) Heat to electricity (C) Light to electricity (D) Electricity to light Answer: (C)
Microwaves are used in – (A) Optical fiber (B) Satellite communication (C) Thermal power (D) X-ray imaging Answer: (B)
Entropy is a measure of – (A) Mass (B) Energy (C) Disorder (D) Charge Answer: (C)
The unit of force is – (A) Joule (B) Newton (C) Watt (D) Ampere Answer: (B)
Density is defined as – (A) Mass × volume (B) Mass / volume (C) Volume / mass (D) Weight × volume Answer: (B)
