In the circuit below, bulbs X and Y are glowing.
figure

A third bulb is added to the circuit as shown here. With switch P closed and switch Q open, which bulbs will glow?
figure

Bulb X Bulb Y Bulb Z

a. glow glow not glow

b. glow not glow glow

c. not glow glow glow

d glow glow glow

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Solution

Option (a) is correct.
Bulbs X and Y will glow but bulb Z will not glow if switch Q is open. This is because no current passes through bulb Z in this case.

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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.

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

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B_{1}

and

B_{2}

, resistor R and an inductor L. Assume the inductor L and the bulbs to be of negligible resistance.
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Two bulbs are marked as ‘A’ having rating 60W, 220V & ‘B’ having rating 100W, 220V. They are connected in parallel to a 220 V source. Which of the two will glow brighter?

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	Bulb X	Bulb Y	Bulb Z
a.	glow	glow	not glow
b.	glow	not glow	glow
c.	not glow	glow	glow
d	glow	glow	glow

In the circuit below, bulbs X and Y are glowing. figure A third bulb is added to the circuit as shown here. With switch P closed and switch Q open, which bulbs will glow? figure Bulb X Bulb Y Bulb Z a. glow glow not glow b. glow not glow glow c. not glow glow glow d glow glow glow

Option (a) is correct. Bulbs X and Y will glow but bulb Z will not glow if switch Q is open. This is because no current passes through bulb Z in this case.

In the circuit below, bulbs X and Y are glowing.
figure

A third bulb is added to the circuit as shown here. With switch P closed and switch Q open, which bulbs will glow?
figure

Bulb X Bulb Y Bulb Z

a. glow glow not glow

b. glow not glow glow

c. not glow glow glow

d glow glow glow

Option (a) is correct.
Bulbs X and Y will glow but bulb Z will not glow if switch Q is open. This is because no current passes through bulb Z in this case.