1. Question 1 of 25

   Spectacle lenses for short-sightedness (myopia) are

   A Convex B Plane C Cylindrical only D Concave
2. Question 2 of 25

   An electric bell works on the principle of

   A Static electricity B Thermal expansion C Electromagnet D Reflection
3. Question 3 of 25

   Optical fibres used in internet cables work on

   A Diffraction B Dispersion C Magnetic induction D Total internal reflection
4. Question 4 of 25

   A common ionisation smoke detector contains a small amount of

   A Uranium-235 B Radon C Carbon-14 D Americium-241
5. Question 5 of 25

   A camera and the human eye both form on a screen or retina

   A A real, inverted image using a convex lens B A virtual, erect image C A virtual, inverted image D No image
6. Question 6 of 25

   A magnifying glass is a

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

   Touch screens on most smartphones work on the principle of

   A Capacitance changes caused by a finger B Sound reflection C Heat sensing D Nuclear radiation
8. Question 8 of 25

   GPS receivers determine position using signals from

   A One satellite only B Radio towers only C At least four satellites D Underground cables
9. Question 9 of 25

   A seat belt protects passengers in a sudden stop because of

   A Buoyancy B Friction of air C Inertia D Magnetism
10. Question 10 of 25

    An electric generator works on the principle of

    A Photoelectric effect B Thermal expansion C Electromagnetic induction D Chemical reaction
11. Question 11 of 25

    A thermostat in an iron or refrigerator often uses a

    A Convex lens B Transformer C Microphone D Bimetallic strip
12. Question 12 of 25

    A transformer works on

    A Static electricity B Mutual induction C Thermal expansion D Reflection
13. Question 13 of 25

    A periscope uses the principle of

    A Refraction by a lens B Diffraction C Reflection from plane mirrors D Dispersion
14. Question 14 of 25

    A solar cell converts

    A Electricity into light B Heat into sound C Sound into light D Light into electricity
15. Question 15 of 25

    A car air bag protects passengers by

    A Increasing the time of impact, reducing the force B Increasing the speed C Increasing friction of the seat D Making the car heavier
16. Question 16 of 25

    A loudspeaker converts

    A Sound into electrical signals B Electrical signals into sound C Light into electricity D Heat into sound
17. Question 17 of 25

    Bicycle gears help a rider by

    A Creating energy B Changing the force and speed ratio between pedals and wheels C Reducing weight D Removing friction completely
18. Question 18 of 25

    A metal detector works on

    A Electromagnetic induction B Photoelectric effect C Reflection of sound D Chemical change
19. Question 19 of 25

    A TV remote control sends signals using

    A X-rays B Ultraviolet light C Sound waves D Infrared radiation
20. Question 20 of 25

    A pendulum clock's accuracy depends on the fact that the time period of a simple pendulum depends mainly on its

    A Mass of the bob B Length C Colour D Material
21. Question 21 of 25

    A barcode scanner reads codes by detecting

    A Sound waves B X-rays C Laser light reflected from black and white bars D Magnetic ink
22. Question 22 of 25

    A lightning conductor protects buildings by

    A Providing a low-resistance path for charge to reach the earth B Attracting thunder C Storing charge D Reflecting light
23. Question 23 of 25

    A photocopier works mainly on the principle of

    A Static electricity B Magnetism C Sound D Radioactivity
24. Question 24 of 25

    An electric fan motor works on the principle that

    A Light is a wave B A current-carrying conductor in a magnetic field experiences a force C Water boils at 100 degrees Celsius D Sound travels in a medium
25. Question 25 of 25

    A microphone converts

    A Sound energy into electrical signals B Electrical signals into sound C Light into sound D Heat into light

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