Quiz for Light, Sound & Heat

Q1: What is the speed of light in vacuum?

A. 300,000 km/s B. 150,000 km/s C. 100,000 km/s D. 500,000 km/s

Q2: Which phenomenon explains the formation of a rainbow?

A. Reflection B. Refraction C. Diffraction D. Dispersion

Q3: Which type of lens is used to correct myopia?

A. Concave lens B. Convex lens C. Bifocal lens D. Cylindrical lens

Q4: What unit is used to measure sound intensity?

A. Decibel B. Hertz C. Newton D. Ampere

Q5: Which color has the shortest wavelength?

A. Red B. Green C. Blue D. Violet

Q6: Which mirror is used in vehicles to see rear view?

A. Convex mirror B. Concave mirror C. Plane mirror D. Parabolic mirror

Q7: Heat transfer through solid is called?

A. Radiation B. Conduction C. Convection D. Compression

Q8: What is the unit of frequency?

A. Watt B. Pascal C. Hertz D. Joule

Q9: Which instrument measures temperature?

A. Thermometer B. Barometer C. Hygrometer D. Altimeter

Q10: What kind of image is formed by a plane mirror?

A. Inverted and real B. Upright and real C. Upright and virtual D. Inverted and virtual

Q11: The bending of light around an obstacle is called?

A. Reflection B. Refraction C. Diffraction D. Scattering

Q12: Which phenomenon causes the twinkling of stars?

A. Refraction B. Dispersion C. Scattering D. Interference

Q13: Which type of wave is sound?

A. Transverse B. Longitudinal C. Electromagnetic D. Standing

Q14: Speed of sound is maximum in?

A. Air B. Water C. Steel D. Vacuum

Q15: Which law states angle of incidence equals angle of reflection?

A. Newton’s law B. Snell’s law C. Law of reflection D. Ohm’s law

Q16: What causes the blue color of the sky?

A. Refraction B. Diffraction C. Dispersion D. Scattering

Q17: Which device converts sound to electrical signals?

A. Speaker B. Transducer C. Microphone D. Amplifier

Q18: Infrared radiation is mostly associated with?

A. Heat B. Light C. Magnetism D. Electricity

Q19: Which gas is used in fluorescent lamps?

A. Helium B. Neon C. Argon D. Nitrogen

Q20: What happens to light when it passes from air to water?

A. Speed increases B. Speed decreases C. Frequency increases D. Wavelength increases