I. Fill in the blanks:
a. The bulb will not glow if the filament of the bulb
has ____________.
b.___________ is a non-metal which is a good
conductor of electricity.
c. A dry cell contains ___________ and __________
in powdered or paste form.
d. Electricity ________ flow through iron.
II Short answer type questions:
a. What is the difference between a cell and a
battery?
b.What happens if two terminals of the cell is
connected to a wire without connecting an
appliance in a circuit?
c. Why the filament of a bulb is made up of
tungsten?
II. Long Answer type questions:
1. Explain the working of an electric torch.
2. Consider the following circuit diagrams:
In which of the above circuits bulb will glow and why?
The solution/s to your1st and 2nd query have been provided below:
1.
a. The bulb will not glow if the filament of the bulb has Broken
b. Graphite is a non-metal which is a good conductor of electricity.
c.A dry cell contains zinc anode, carbon cathode and ammonium chloride electrolyte in powdered or paste form.
d. Electricity can flow through iron.
2.
a. Difference in Cell and Battery
Cell is the unit which has two terminals one positive and one negative. A battery is a group of cells in which one negative terminal is attached to one positive terminal.
Cell:- Cell is the smallest unit of a battery.
Battery:-A battery is combination of cells.
b. If two terminals of the cell is connected to a wire without connecting an appliance in a circuit, then the cell damaged very quickly as chemicals present in the electric cell get used up very rapidly. Thats why we should not connect the positive and negative terminals of a cell directly via wire.
c.Tungsten metal is selected for making filaments of lamp bulbs because tungsten can sustain high temperatures and it has high melting point, combined with the fact that it also has high resistivity.
Regards,