The speed of light is maximum in – (A) Water (B) Air (C) Diamond (D) Vacuum Answer: (D)
The SI unit of pressure is – (A) Dyne/cm² (B) Newton (C) Pascal (D) Joule Answer: (C)
Rocket propulsion works on the principle of – (A) Newton’s First Law (B) Conservation of Energy (C) Newton’s Third Law (D) Law of Inertia Answer: (C)
The phenomenon of mirage is due to – (A) Reflection (B) Refraction (C) Total internal reflection (D) Interference Answer: (C)
Ultrasound is used in medical imaging because – (A) It penetrates deeply (B) It is non-ionizing (C) It is reflected by tissue boundaries (D) All of the above Answer: (D)
Unit of magnetic field strength is – (A) Tesla (B) Henry (C) Weber (D) Ohm Answer: (A)
The minimum energy required to remove an electron from an atom is called – (A) Ionization energy (B) Binding energy (C) Work function (D) Potential energy Answer: (A)
Loudness is measured in – (A) Decibels (B) Hertz (C) Watts (D) Joules Answer: (A)
Centrifugal force is – (A) Real (B) Imaginary (C) Frictional (D) Tension Answer: (B)
Escape velocity on the Moon is – (A) 2.4 km/s (B) 4.4 km/s (C) 11.2 km/s (D) 1.6 km/s Answer: (A)
The SI unit of luminous flux is – (A) Candela (B) Lumen (C) Lux (D) Watt Answer: (B)
A siphon works due to – (A) Capillarity (B) Gravity and atmospheric pressure (C) Osmosis (D) Surface tension Answer: (B)
The SI unit of angular velocity is – (A) Rad/s (B) m/s² (C) N·m (D) m/s Answer: (A)
The value of universal gravitational constant (G) is – (A) 9.8 m/s² (B) 6.67 × 10⁻¹¹ N·m²/kg² (C) 3.00 × 10⁸ m/s (D) 1.6 × 10⁻¹⁹ C Answer: (B)
In refraction, the incident and refracted rays lie – (A) At right angles (B) On opposite sides (C) On the same side (D) In the same plane Answer: (D)
A lens with both surfaces bulging outward is called – (A) Concave lens (B) Plano-concave (C) Convex lens (D) Biconcave Answer: (C)
The focal length of a convex mirror is – (A) Positive (B) Zero (C) Negative (D) Infinite Answer: (C)
Retentivity is the ability of a material to – (A) Conduct heat (B) Retain magnetism (C) Store charge (D) Resist current Answer: (B)
Transformer core is made of – (A) Copper (B) Iron (C) Soft iron (D) Steel Answer: (C)
The intensity of gravitational field is – (A) Scalar (B) Constant (C) Vector (D) Independent of mass Answer: (C)
The S.I. unit of radiation dose is – (A) Gray (B) Curie (C) Becquerel (D) Sievert Answer: (A)
The photoelectric effect proves – (A) Wave theory of light (B) Particle nature of light (C) Refraction (D) Dispersion Answer: (B)
In electrostatics, electric field lines – (A) Cross each other (B) Begin on positive charges and end on negative charges (C) Are circular (D) Are invisible Answer: (B)
The power dissipated in a resistor is given by – (A) V/I (B) V²/R (C) I²/R (D) VR Answer: (B)
A body moving with constant velocity has – (A) Changing momentum (B) Zero acceleration (C) Decreasing energy (D) Uniform acceleration Answer: (B)
Viscosity is a property of – (A) Solids (B) Gases (C) Liquids (D) Both gases and liquids Answer: (D)
CNG is preferred in vehicles because – (A) It is cheap (B) It is less polluting (C) It increases speed (D) It is a liquid fuel Answer: (B)
The unit of refractive index is – (A) m/s (B) Dimensionless (C) m⁻¹ (D) Hz Answer: (B)
Solar panels work on – (A) Electromagnetic induction (B) Photoelectric effect (C) Thermal radiation (D) Capacitance Answer: (B)
Latent heat of fusion is involved in – (A) Melting of ice (B) Boiling water (C) Freezing vapor (D) Heating solids Answer: (A)
The frequency of AC current in India is – (A) 50 Hz (B) 60 Hz (C) 100 Hz (D) 25 Hz Answer: (A)
A seismograph records – (A) Rain (B) Humidity (C) Earthquakes (D) Wind Answer: (C)
Ohmic conductors follow – (A) Newton’s Law (B) Ampere’s Law (C) Ohm’s Law (D) Coulomb’s Law Answer: (C)
The charge on an electron is – (A) +1.6 × 10⁻¹⁹ C (B) –1.6 × 10⁻¹⁹ C (C) 0 (D) 9.1 × 10⁻³¹ kg Answer: (B)
A series circuit has – (A) Same current, different voltage (B) Same voltage, different current (C) Zero current (D) No resistance Answer: (A)
Free electrons are found in – (A) Non-metals (B) Gases (C) Metals (D) Insulators Answer: (C)
Static friction is – (A) Less than kinetic (B) More than kinetic (C) Equal to kinetic (D) Zero Answer: (B)
Spectacles for myopia use – (A) Convex lenses (B) Concave lenses (C) Cylindrical lenses (D) Plano-convex lenses Answer: (B)
Impulse is equal to – (A) Force × time (B) Mass × velocity (C) Pressure × area (D) Work × distance Answer: (A)
A megaton is a unit of – (A) Sound (B) Light (C) Energy (D) Mass Answer: (C)
A zener diode is used in – (A) Current regulation (B) Rectification (C) Voltage regulation (D) Amplification Answer: (C)
One kilowatt-hour (kWh) is equal to – (A) 1000 J (B) 3600 J (C) 3.6 × 10⁶ J (D) 3.6 × 10⁹ J Answer: (C)
The potential energy of a spring is – (A) Linear (B) Inversely proportional to displacement (C) ½ kx² (D) kx Answer: (C)
The SI unit of momentum is – (A) N (B) kg·m/s (C) m/s² (D) N·m Answer: (B)
The color of an object is determined by – (A) Emitted light (B) Absorbed light (C) Reflected light (D) Transmitted light Answer: (C)
The resistance of a wire increases when – (A) Length increases (B) Area increases (C) Temperature decreases (D) Resistivity decreases Answer: (A)
A convex lens can form – (A) Only virtual images (B) Only real images (C) Both real and virtual images (D) No image Answer: (C)
A resonance condition in a circuit results in – (A) Max resistance (B) Min impedance (C) Max voltage (D) Zero current Answer: (B)
Thermal expansion in solids is due to – (A) Intermolecular forces (B) Increase in kinetic energy (C) Radiation (D) Friction Answer: (B)
The standard atmospheric pressure is – (A) 100 kPa (B) 76 mm Hg (C) 1.013 × 10⁵ Pa (D) All of the above Answer: (D)
