A light ray entering glass from air bends – (A) Away from the normal (B) Toward the normal (C) Does not bend (D) Reflects back Answer: (B)
The resonance condition in an LCR circuit results in – (A) Zero current (B) Infinite resistance (C) Maximum current (D) No voltage Answer: (C)
1 horsepower is equal to – (A) 746 watts (B) 1 kilowatt (C) 550 watts (D) 500 watts Answer: (A)
Momentum is conserved in – (A) Inelastic collisions only (B) Elastic collisions only (C) All types of collisions (D) Explosions only Answer: (C)
Voltage across a capacitor in a DC circuit – (A) Increases indefinitely (B) Drops to zero (C) Builds up then stays constant (D) Oscillates Answer: (C)
A tuning fork is used to produce – (A) Loud sounds (B) Light (C) Musical note of known frequency (D) Electrical signals Answer: (C)
The wavelength of UV rays is – (A) 10–400 nm (B) 400–700 nm (C) 1–10 nm (D) 700–1000 nm Answer: (A)
The SI unit of work done is – (A) Newton (B) Joule (C) Watt (D) Erg Answer: (B)
A body of mass m moving at speed v has kinetic energy – (A) mv² (B) ½mv (C) ½mv² (D) m²v Answer: (C)
A vibration that fades over time is called – (A) Simple harmonic motion (B) Periodic motion (C) Damped vibration (D) Natural vibration Answer: (C)
Resistance of a conductor increases with – (A) Decrease in length (B) Increase in temperature (C) Increase in area (D) Better conductor Answer: (B)
SI unit of heat capacity is – (A) J/kg·K (B) J/K (C) Cal/g (D) K Answer: (B)
The refractive index of vacuum is – (A) 0 (B) 1 (C) Infinite (D) Varies Answer: (B)
A concave mirror is also called – (A) Diverging mirror (B) Plane mirror (C) Converging mirror (D) Flat mirror Answer: (C)
Specific gravity is defined as – (A) Density / mass (B) Density of substance / density of water (C) Mass / density (D) Volume / weight Answer: (B)
The principle of conservation of energy states that – (A) Energy is always lost (B) Energy can’t be transformed (C) Total energy remains constant (D) Work equals force Answer: (C)
The displacement in a circular path is – (A) Circumference (B) Zero (C) Radius (D) Arc length Answer: (B)
A photo diode operates under – (A) Forward bias (B) Reverse bias (C) Zero bias (D) AC supply Answer: (B)
The power of an appliance is calculated by – (A) Voltage × resistance (B) Voltage / resistance (C) Voltage × current (D) Current / voltage Answer: (C)
A liquid drop forms a sphere due to – (A) Gravity (B) Cohesion (C) Surface tension (D) Adhesion Answer: (C)
Ohm’s Law holds good for – (A) Vacuum (B) All devices (C) Metallic conductors (D) Diodes Answer: (C)
A current of 2 A flowing for 10 seconds transfers – (A) 2 C (B) 10 C (C) 20 C (D) 5 C Answer: (C)
The velocity of sound in steel is approx – (A) 340 m/s (B) 1000 m/s (C) 5000 m/s (D) 10000 m/s Answer: (C)
The acceleration of a body at rest is – (A) 0 (B) 9.8 m/s² (C) Infinite (D) Variable Answer: (A)
The center of mass of a uniform ring lies – (A) At the center (B) On the circumference (C) Outside the ring (D) Varies Answer: (A)
Inertia is the property that – (A) Opposes acceleration (B) Resists change in motion (C) Produces motion (D) Changes direction Answer: (B)
The amount of charge in 1 mole of electrons is – (A) 1 C (B) 9.8 C (C) 96,500 C (D) 6.022 × 10²³ C Answer: (C)
A sonometer measures – (A) Weight (B) Sound intensity (C) Frequency (D) Acceleration Answer: (C)
The energy stored in a spring is – (A) mgh (B) ½kx² (C) kx (D) ½mv² Answer: (B)
A fuse is rated by – (A) Voltage (B) Current (C) Resistance (D) Wattage Answer: (B)
Dispersion occurs due to – (A) Change in speed with frequency (B) Reflection (C) Interference (D) Polarization Answer: (A)
Thermal equilibrium implies – (A) No heat exchange (B) Same pressure (C) Equal volume (D) Same density Answer: (A)
The power output of a machine is 100 W. In 5 sec it does – (A) 5 J (B) 20 J (C) 500 J (D) 1000 J Answer: (C)
Pressure cooker works faster because – (A) More steam escapes (B) Temperature rises with pressure (C) More oxygen is present (D) Less water is used Answer: (B)
Spherical aberration occurs in – (A) Mirrors only (B) Lenses only (C) Both lenses and mirrors (D) Prisms Answer: (C)
Red light travels fastest in – (A) Water (B) Glass (C) Air (D) Vacuum Answer: (D)
A liquid exhibits surface tension because – (A) Molecules attract each other (B) Molecules repel each other (C) Liquids expand (D) Density is high Answer: (A)
The magnetic field inside a long solenoid is – (A) Non-uniform (B) Zero (C) Constant (D) Variable Answer: (C)
Escape velocity on Earth is about – (A) 7.9 km/s (B) 9.8 m/s (C) 11.2 km/s (D) 20 km/s Answer: (C)
The term “light” in physics refers to – (A) Infrared rays (B) Electromagnetic radiation visible to eye (C) Ultraviolet rays (D) White light only Answer: (B)
The lens used in magnifying glass is – (A) Concave (B) Convex (C) Plane (D) Plano-concave Answer: (B)
Inertia of motion explains – (A) A moving object continues to move (B) Resting object remains at rest (C) Object resists acceleration (D) Object attracts other objects Answer: (A)
Energy stored in capacitor is measured in – (A) Joule (B) Volt (C) Ampere (D) Watt Answer: (A)
A transistor is used in – (A) Rectification (B) Amplification (C) Energy storage (D) Circuit breaking Answer: (B)
Refraction is the bending of light when it – (A) Reflects (B) Passes from one medium to another (C) Disperses (D) Scatters Answer: (B)
The angle of incidence = angle of reflection is explained by – (A) Newton’s Laws (B) Huygens’ Principle (C) Law of reflection (D) Fermat’s Principle Answer: (C)
A capacitor blocks – (A) DC (B) AC (C) Both (D) None Answer: (A)
Black holes are detected through – (A) Emitted light (B) Reflected waves (C) Gravitational waves and X-rays (D) Electric field Answer: (C)
The size of nucleus is in the order of – (A) 10⁻⁶ m (B) 10⁻⁹ m (C) 10⁻¹⁰ m (D) 10⁻¹⁴ m Answer: (D)