The reasons could be:
(i) the bulb is fused.
(ii) the cell is a used one.
(iii) break in connecting wire.
(iv) loose connections. (Any two)
Question
An electric bulb is connected to a cell through a switch as shown in figure below. When the switch is brought in ‘ON’ position, the bulb does not glow. What could be the possible reason/s for it? Mention any two of them. 
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