Observe the given figure and answer the following questions. The bulb will glow when a ______ is placed in between the probes.

Crayon

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Comb

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Key

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Piece of stone

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Solution

The correct option is B Key
Materials that allow electric current to pass through them are called conductors. Key is a metallic object. When it is placed in between probes then the current can easily flow in the circuit.

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Question 3

Three bulbs A, B, C are connected in a circuit as shown in Figure. When the switch is ‘ON’

(a) bulb C will glow first

(b) bulb B and C will glow simultaneously and bulb A will glow after some time

(d) the bulbs will glow in the order A, B and C

Question 5

In the circuit shown below, when the switch is moved to ‘ON’ position,

(a) the bulb A will glow first.

(b) the bulb B will glow first.

(d) all bulbs will glow together.

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