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Question Bank from ELECTRICITY for Class X CBSE Physics
I. Very Short Answer Type Questions
Define electric current
Define 1 ampere
What is the cause of resistance of a conductor?
Define resistance
Define one ohm.
State ohm's law
Write the mathematical form of ohm's law
What is an electric circuit?
What is an open circuit and a closed circuit?
What are the factors affecting the resistance of a conductor?
Define resisitivity.
What is the unit of resisitivity?
Why alloys are preferred to metals in making heating elements of heating appliances?
State Joule's law of heating.
Draw the circuit diagram to verify Ohm's law.
Calculate the effective resistance when 3 resistors are connected (a) in series and (b) in parallel
How many electrons make one coulomb of charge?
Why the household wiring uses all appliances in parallel? Write the advantages.
Draw a graph to show the variation of current with potential for a good conductor.
What is the SI Unit of electric Potential?
What do you mean by the statement; "The electric potential between the points A and B is 1 V"?
There are two electric bulbs, one marked 60W 220V and the other marked 100W 220V. Which one of the two has a higher resistance?
Of the two; a toaster of 1 kW and an electric heater of 2 kW, which has higher resistance?
Name a metals which offers higher resistance to the passage of electricity than copper.
Calculate the ratio of resistances of a 50W bulb and a 25 W bulb.
Why is tungsten preferred to make the filament of an incandescent lamp?
A wire of resistance 10 Ω is bent in the form of a circle. What is the effective resistance between the two points at the ends of any one of the diameter of the circle?
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"We know very little, and yet it is astonishing that we know so much and still more astonishing that so little knowledge can give us so much power." - Bertrand Russel
“The most incomprehensible thing about the world is that it is comprehensible” - Einstein
“It is more important to have beauty in the equations of physics than to have them agree with experiments”. - P. A. M. Dirac
"The chess-board is the world; the pieces are the phenomena of the universe; the rules of the game are what we call the Laws of Nature. The player on the other side is hidden from us. We know that his play is always fair, and patient. But also we know, to our cost, that he never overlooks a mistake, or makes the smallest allowance for ignorance" - Thomas Huxley
"Nature and Nature's laws lay hid in night,
God said "Let Newton be", and all was light." - Alexander Pope
"Big whirls have little whirls,
That feed on their velocity
And little whirls have lesser whirls,
An so on to viscosity" -- Lewis Richardson
"An ocean traveller has even more vividly the impression that
the ocean is made of waves that that it is made of water" - A.S. Eddington