The process of changing solid directly into gas is – (A) Melting (B) Sublimation (C) Vaporization (D) Fusion Answer: (B)
The speed of light in air is approx – (A) 2 × 10⁸ m/s (B) 3 × 10⁸ m/s (C) 1.5 × 10⁸ m/s (D) 4 × 10⁸ m/s Answer: (B)
The turning effect of a force is called – (A) Moment (B) Work (C) Power (D) Impulse Answer: (A)
Pascal’s law relates to – (A) Pressure in solids (B) Pressure in fluids (C) Pressure in gases only (D) Temperature in gases Answer: (B)
The shape of liquid drops in space is – (A) Elliptical (B) Irregular (C) Spherical (D) Cubic Answer: (C)
Total internal reflection occurs when light moves from – (A) Water to air (B) Air to water (C) Air to glass (D) Vacuum to air Answer: (A)
A body’s resistance to change in motion is due to – (A) Velocity (B) Mass (C) Inertia (D) Weight Answer: (C)
The unit of solid angle is – (A) Degree (B) Radian (C) Steradian (D) Lux Answer: (C)
The planet with the strongest gravity is – (A) Earth (B) Mars (C) Jupiter (D) Venus Answer: (C)
Power is the rate of doing – (A) Energy (B) Force (C) Work (D) Motion Answer: (C)
A loudspeaker converts – (A) Sound to electrical energy (B) Electrical to sound energy (C) Heat to sound (D) Vibration to heat Answer: (B)
The capacity of a conductor to hold charge is – (A) Resistance (B) Capacitance (C) Conductance (D) Inductance Answer: (B)
A negative charge placed near another negative charge will – (A) Attract (B) Repel (C) Stay still (D) Form a dipole Answer: (B)
A gyroscope works on – (A) Gravity (B) Conservation of angular momentum (C) Reflection (D) Heat Answer: (B)
The mass of an object is a measure of – (A) Volume (B) Density (C) Inertia (D) Gravity Answer: (C)
The resistance of a conductor increases with – (A) Decrease in length (B) Increase in area (C) Increase in temperature (D) Use of silver Answer: (C)
Hydraulic brakes work on – (A) Archimedes’ principle (B) Bernoulli’s theorem (C) Pascal’s law (D) Newton’s law Answer: (C)
X-ray tubes operate on the principle of – (A) Photoelectric effect (B) Thermionic emission (C) Nuclear reaction (D) Alpha emission Answer: (B)
The lightest gas is – (A) Helium (B) Oxygen (C) Hydrogen (D) Neon Answer: (C)
The neutral particle in an atom is – (A) Proton (B) Electron (C) Neutron (D) Positron Answer: (C)
The Sun emits energy due to – (A) Combustion (B) Fission (C) Fusion (D) Radiation Answer: (C)
SI unit of pressure is equivalent to – (A) N/m (B) N·m (C) N/m² (D) J/m² Answer: (C)
A gas expands suddenly and adiabatically, its – (A) Temperature rises (B) Temperature falls (C) Pressure increases (D) Heat enters Answer: (B)
A light ray bent more in – (A) Air (B) Water (C) Glass (D) Vacuum Answer: (C)
The instrument used to detect charge is – (A) Galvanometer (B) Ammeter (C) Electroscope (D) Voltmeter Answer: (C)
A screw jack is based on – (A) Lever (B) Pulley (C) Inclined plane (D) Hydraulic lift Answer: (C)
The density of water is – (A) 100 kg/m³ (B) 1000 kg/m³ (C) 10 kg/m³ (D) 1 kg/m³ Answer: (B)
Torque is measured in – (A) Watt (B) Newton (C) Newton meter (D) Pascal Answer: (C)
The power of accommodation relates to – (A) Brain (B) Eyes (C) Lungs (D) Muscles Answer: (B)
The SI unit of luminous flux is – (A) Candela (B) Lux (C) Lumen (D) Watt Answer: (C)
The apparent weight of a body in a lift increases when – (A) Lift moves upward (B) Lift moves downward (C) Lift is in free fall (D) Lift is at rest Answer: (A)
A body moving in a circle at constant speed is – (A) In uniform motion (B) Not accelerated (C) Uniformly accelerated (D) Rotating without force Answer: (C)
A vibrating tuning fork produces – (A) Electricity (B) Magnetic field (C) Sound waves (D) Radio waves Answer: (C)
Light travels faster in – (A) Water (B) Glass (C) Air (D) Diamond Answer: (C)
A fuse protects circuit from – (A) Voltage fluctuations (B) High resistance (C) Overcurrent (D) Under voltage Answer: (C)
The capacity of a battery is measured in – (A) Volt (B) Ampere (C) Ampere-hour (D) Ohm Answer: (C)
A concave lens is – (A) Converging (B) Diverging (C) Enlarging (D) Focusing Answer: (B)
The velocity-time graph of uniform motion is – (A) Curved (B) Straight and horizontal (C) Vertical line (D) Diagonal curve Answer: (B)
A rocket works on – (A) Newton’s First Law (B) Newton’s Third Law (C) Law of gravitation (D) Bernoulli’s principle Answer: (B)
A free-falling object has – (A) Constant velocity (B) Constant acceleration (C) Increasing mass (D) Zero force Answer: (B)
Mirage is seen due to – (A) Diffraction (B) Total internal reflection (C) Refraction (D) Dispersion Answer: (B)
A current carrying coil behaves like – (A) Resistor (B) Battery (C) Magnet (D) Inductor Answer: (C)
The total number of fundamental quantities in SI is – (A) 5 (B) 7 (C) 10 (D) 9 Answer: (B)
Stress is defined as – (A) Force per area (B) Energy per volume (C) Displacement per time (D) Mass per acceleration Answer: (A)
A steel ball is dropped in glycerin and comes to rest — it has reached – (A) Escape velocity (B) Terminal velocity (C) Zero gravity (D) High pressure Answer: (B)
The escape velocity on Moon is – (A) More than Earth (B) Same as Earth (C) Less than Earth (D) Infinite Answer: (C)
The temperature at which Celsius = Fahrenheit is – (A) –273°C (B) –100°C (C) –40°C (D) 0°C Answer: (C)
The lightest and most abundant element in the universe is – (A) Helium (B) Oxygen (C) Hydrogen (D) Nitrogen Answer: (C)
Centripetal acceleration is directed – (A) Tangent to path (B) Away from center (C) Toward center (D) Vertically Answer: (C)
The mirror used by dentists is – (A) Convex (B) Concave (C) Plane (D) Cylindrical Answer: (B)
