HorthooZ – Kerala GK, PSC Questions & Onam Quiz

Q1 Multiple Choice Question

What is 'presbyopia', and which type of lenses are commonly prescribed to correct it?

A Childhood myopia corrected with cylindrical lenses B Color blindness corrected with tinted glasses C Total blindness cured with surgery only D Age-related farsightedness corrected using bifocal lenses

Q2 Multiple Choice Question

Why are convex mirrors preferred as rear-view mirrors in automobiles over plane or concave mirrors?

A They concentrate all sunlight into a burning focal point B They form inverted magnified images of distant cars C They reverse left and right sides accurately D They always form diminished, erect images and provide a much wider field of view

Q3 Multiple Choice Question

In astronomical spectroscopy, what does a 'redshift' in the spectral lines of a distant receding star indicate according to the Doppler Effect?

A An increase in observed wavelength due to the star moving away from Earth B An increase in stellar surface temperature and mass density C Complete cessation of electromagnetic radiation D A decrease in wavelength due to rapid approach towards Earth

Q4 Multiple Choice Question

Why are concave mirrors commonly used as shaving mirrors, dentist mirrors, and in vehicle headlights?

A They can form enlarged virtual images (when close) and powerful parallel beams of light B They reflect light in all random directions without focus C They disperse white light into component colors like prisms D They always form diminished virtual images like convex mirrors

Q5 Multiple Choice Question

What mathematical relationship connects the critical angle (C) of a medium and its absolute refractive index (n)?

A C = 90 - n B sin C = n C sin C = 1 / n D C = sin^(-1)(n)

Q6 Multiple Choice Question

What is the SI unit of lens power ($P$), and how is it related to focal length ($f$) in meters?

A Joule, where P = f / 2 B Watt, where P = f^2 C Dioptre (D), where P = 1 / f (in meters) D Newton, where P = 1 / f^2

Q7 Multiple Choice Question

According to the laws of reflection of light, what is the relationship between the angle of incidence ($i$) and the angle of reflection ($r$)?

A Angle of incidence is twice the angle of reflection B Angle of incidence plus reflection equals 180 degrees C Angle of incidence is independent of reflection angle D Angle of incidence is always equal to angle of reflection ($i = r$)

Q8 Multiple Choice Question

When a sound source moves towards a stationary observer, what happens to the perceived frequency of sound?

A The frequency remains completely unchanged B The sound wave transforms into an electromagnetic wave C The apparent frequency increases (higher pitch) D The apparent frequency decreases (lower pitch)

Q9 Multiple Choice Question

Which type of lens is used to correct hypermetropia (long-sightedness), where nearby objects cannot be seen clearly?

A Prism lens B Convex lens C Plano-concave lens D Concave lens

Q10 Multiple Choice Question

What type of lens is a simple microscope (magnifying glass), and what kind of image does it produce?

A Convex lens, producing a virtual, erect, and magnified image B Bifocal lens, producing diminished image C Plane mirror, producing lateral inversion only D Concave lens, producing real inverted image

Q11 Multiple Choice Question

What type of mechanical waves are sound waves in air, and what do they require to propagate?

A Electromagnetic waves, traveling at speed of light B Transverse waves, able to travel through vacuum C Longitudinal waves, requiring a material medium D Stationary waves, requiring zero gravity

Q12 Multiple Choice Question

What acoustic phenomenon occurs when two sound waves of slightly different frequencies interfere with each other?

A Doppler frequency shift B Total acoustic reflection C Beats (periodic rise and fall in sound intensity) D Echo formation

Q13 Multiple Choice Question

What is the term for the bending of light waves around the sharp corners or edges of an obstacle into the region of geometrical shadow?

A Total internal reflection B Diffraction of light C Specular reflection D Chromatic aberration

Q14 Multiple Choice Question

What parameters does the Lens Maker's Formula depend upon when designing a lens with a specific focal length?

A Object distance and image distance only B Lens weight and color of surrounding air C Ambient temperature and atmospheric pressure D Refractive index of lens material and radii of curvature of its two surfaces

Q15 Multiple Choice Question

What are the two main lenses used in a standard refracting astronomical telescope, and how do their focal lengths compare?

A Both objective and eyepiece have identical focal lengths B Objective lens has short focal length, eyepiece has long focal length C Objective lens has a very long focal length, while eyepiece has a short focal length D Both lenses are concave of equal power

Q16 Multiple Choice Question

According to the Rayleigh criterion, what factors determine the angular resolution limit ($ heta$) of a telescope or microscope?

A Wavelength of light ($\lambda$) and aperture diameter ($D$), where $ heta pprox 1.22 \lambda / D$. B Focal length of eyepiece and tube length alone C Mass of the optical glass and ambient temperature D Speed of light and gravitational acceleration

Q17 Multiple Choice Question

What is the frequency range of ultrasonic sound waves, which are beyond the upper limit of human hearing?

A Exactly 50 Hz B Between 20 Hz and 20,000 Hz C Below 20 Hz D Above 20,000 Hz (20 kHz)

Q18 Multiple Choice Question

Why does the sky appear blue during daytime and the sun appear red during sunrise and sunset?

A Refraction of starlight through cold air layers B Scattering of light (Rayleigh scattering, where shorter wavelengths scatter more) C Dispersion of light through water droplets as a rainbow D Total internal reflection in upper atmosphere

Q19 Multiple Choice Question

What is the splitting of white light into its seven constituent colors when passing through a glass prism called?

A Interference of light B Scattering of light C Total internal reflection D Dispersion of light

Q20 Multiple Choice Question

What is the ratio of harmonic frequencies produced by an open organ pipe compared to a closed organ pipe of the exact same length?

A Both pipes produce identical harmonic frequencies without difference B Open pipe produces zero harmonics, closed pipe produces continuous white noise C Open pipe produces only odd harmonics, closed pipe produces all harmonics D Open pipe produces all harmonics (1:2:3:4), while closed pipe produces only odd harmonics (1:3:5:7).

Optics & Sound