1. Question 1 of 25

   A pencil appears bent in a glass of water because of:

   A Scattering of sound B Absorption of light C Refraction of light D Reflection of light
2. Question 2 of 25

   Which mirror is used as a rear-view mirror in vehicles?

   A Concave mirror B Cylindrical mirror C Convex mirror D Plane mirror
3. Question 3 of 25

   A rainbow is formed when sunlight passes through:

   A Glass windows B Water droplets C Dust particles D Clouds only
4. Question 4 of 25

   Which part of the eye controls the size of the pupil?

   A Retina B Iris C Optic nerve D Cornea
5. Question 5 of 25

   The sky appears blue mainly because of:

   A Refraction by clouds B Scattering of sunlight by air molecules C Reflection of the sea D Absorption by the ozone layer
6. Question 6 of 25

   A magnifying glass is a:

   A Prism B Plane glass C Convex lens D Concave lens
7. Question 7 of 25

   The image formed by a plane mirror is:

   A Real and diminished B Real and inverted C Real and magnified D Virtual and laterally inverted
8. Question 8 of 25

   Doctors use optical fibres in an endoscope to:

   A See inside the body B Heat the tissues C Measure body temperature D Kill bacteria
9. Question 9 of 25

   The speed of light in a vacuum is about:

   A 3 x 10^8 m/s B 3 x 10^4 m/s C 3 x 10^6 m/s D 3 x 10^10 m/s
10. Question 10 of 25

    A reflecting telescope uses a ___ to collect light.

    A Concave mirror B Plane glass C Convex mirror D Prism
11. Question 11 of 25

    A dentist uses a ___ mirror to see a magnified image of teeth.

    A Concave B Spherical convex C Convex D Plane
12. Question 12 of 25

    Short-sightedness (myopia) is corrected using a:

    A Convex lens B Prism C Concave lens D Plane mirror
13. Question 13 of 25

    A compound microscope magnifies tiny objects using:

    A Two plane mirrors B Prisms only C Two convex lenses D Concave mirrors only
14. Question 14 of 25

    The image formed on the retina of the eye is:

    A Virtual and inverted B Virtual and erect C Real and erect D Real and inverted
15. Question 15 of 25

    Optical fibres work on the principle of:

    A Diffraction B Total internal reflection C Interference D Dispersion
16. Question 16 of 25

    Reflectors of torches and car headlights are:

    A Plane mirrors B Prisms C Convex mirrors D Concave mirrors
17. Question 17 of 25

    A camera lens is a ___ lens, which forms a real and inverted image on the sensor or film.

    A Concave B Convex C Cylindrical D Plane
18. Question 18 of 25

    A periscope uses:

    A A concave lens and a prism B Two plane mirrors C A convex mirror and a plane mirror D Two convex mirrors
19. Question 19 of 25

    The power of a lens is measured in:

    A Dioptres B Hertz C Decibels D Pascals
20. Question 20 of 25

    Long-sightedness (hypermetropia) is corrected using a:

    A Plane mirror B Concave mirror C Concave lens D Convex lens
21. Question 21 of 25

    Solar cookers use ___ to concentrate sunlight.

    A Prisms B Convex mirrors C Concave mirrors D Plane glass
22. Question 22 of 25

    A prism splits white light into seven colours by:

    A Reflection B Polarisation C Interference D Dispersion
23. Question 23 of 25

    The word AMBULANCE is written laterally inverted on the front of the vehicle so that:

    A It can be read from the sky B It looks attractive C It reads correctly in the rear-view mirror of the driver ahead D It saves paint
24. Question 24 of 25

    The Sun appears red at sunrise and sunset because:

    A Clouds are always red B The Sun is cooler then C The Moon reflects red light D Blue light is scattered away and red light reaches us
25. Question 25 of 25

    Images formed by convex mirrors are always:

    A Virtual, erect and diminished B Real and inverted C Virtual and magnified D Real and magnified

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