A girl with high-heeled shoes makes much more depression on the sand than an elephant. Why?
All cutting instruments have the sharp edges. Why?
What is galvanometer? How can you convert it into a voltmeter? Why should the resistance of a voltmeter be high?
Two bulbs of 60 watts and 100 watts are connected in series and this combination is connected across the mains. Which bulb will glow more brightly? Give reasons.
Is the terminal potential difference always greater than its emf?
Two bulbs have a filament of the same length. If one is 40 watt and the other is 60 watt, which one has thicker filament??
Why voltmeter is always connected in parallel with the load resistance?
Why alloys of constantan and manganin used to make standard resistors?
A large number of free electrons are present metals. Why is there no current in the absence of electric field across it?
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