Topics from April 2016
- Why does a steel ball pitch higher than a rubber ball?
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- How is information stored in audio and video tapes?
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- What is the origin of gravity?
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- What is brake horse power (BHP)? How is it different from the horse power (HP)?
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- We are all familiar with the popping ears associated with takeoff and landing in an aero plane. This is caused by changes in pressure, but because the aircraft cabin is artificially pressurized, why i
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- Why does a spinning top reverse its direction of rotation towards the end?
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- While light from a candle illuminates a room, the gas (LPG) flame does not. At the same time the gas stoves help cook faster. Can anyone explain?
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- What is the difference between hydrogen and an atom bomb?
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- Why does boiling milk overflow but boiling water does not?
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- How do hearing aids work?
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- What is Global Positioning System (GPS) and how does it work?
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- Why does not sound travel in vacuum but light does?
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- Why is it possible to hear noises from far away clearly on cool damp evenings? Is it because sound travels better in cool, damp air than in dry air?
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- Why do we not hear sound while sleeping or meditating?
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- Why does the flow of ink increases when pens are about to run out of ink?
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- What does Dolby printed on sound systems signify?
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- How does audible sound pass through hard material such as a wall and be audible on the other side?
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- Is there any significance in using gravel on railway tracks?
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- Why do radios receive signals well only when kept in certain directions?
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- What are red eye reduction and its function?
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- Why is it difficult to photograph a TV picture?
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- How does a photocopier work?
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- How does the speed (of vehicles) measuring device used by the traffic police work?
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- Why is it difficult to balance a stationary two wheeler?
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- Why do metallic vessels lose their initial shine after use?
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- Can a fridge, left open in a closed room, be used to cool the room?
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- Why do street lights and head lights of vehicles look like stars when viewed through glass?
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- What is the role of chokes and starter in tube lights? Why do they make noise?
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- How is white light split into seven colours when passed through a prism?
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- Why do we have sodium vapour lamp in the streets and not mercury vapour lamp?
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- Can we reduce power consumption by running fans at slow speeds?
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- When viewed under a tube light, why does a table fan appear to rotate backwards and forwards?
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- Why are fan wings slightly curved?
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- Why does a bird not get electrocuted on sitting on a live wire?
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- How does an electric line testor glow?
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- Why is the shadow bigger than the object?
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- Tube lights do not give sharp shadows like filament bulbs. Why?
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- Why is it marked 6500 K on fluorescent lamps (tube light)?
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- Why does the surface of the incandescent light bulbs become progressively greyer over time?
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- Is it true gas filled lamps offer more light compared to ordinary filament bulb for the same power input? If yes how is it possible?
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- Why do high tension wires produce a humming sound?
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- Why is it that neutron have no charge?
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- What is static electricity? Why and how is it created?
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- Why do electrical appliances draw more current during low voltage?
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- What is Richter scale? How is it used to measure the severity of earthquakes?
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- Why does milk boil and expand so rapidly at a low temperature though some quantity of water is present in it?
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- How do microwave ovens cook food?
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- How does a pressure cooker work?
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- Automatic wrist watches stop functioning if not worn even for a day. How does wearing them on our hand make them function?
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- Why does not the cycle travel backwards when we pedal it in the reverse direction?
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- Why does it seem difficult to cycle up a steep hill than to push the bike up at the same speed?
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