Electricity and Circuits Test

Result

Electricity and Circuits Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

An electric cell has ____ terminals.

A
One

B
Two

C
Three

D
Four

Solution

Electric cell is a source of electricity.
An electric cell has two terminals; one is called positive $$(+ ve)$$ while the
other is negative $$(– ve)$$.
Question 2
1 / -0

The thin wire that gives off light is called the ___________ of the bulb.

A
Cell

B
Filament

C
Wire

D
Battery

Solution

The thin wire that gives off light is called the filament of the bulb.
Question 3
1 / -0

If the switch is connected to a bulb and the battery is kept in the on position what do you observe?

A
The bulb will glow

B
The bulb remains off

C
Cannot say

D
None of the above

Solution

When the switch is turned ON the circuit completes and the bulb starts to glow. When the switch is turned OFF the bulb does not glow. So circuit has two states on which the bulb depends. So we cannot determine by just connecting the switch in the circuit.
Question 4
1 / -0

An electric bulb rated $$220\ V, 60\ W$$ is working at full efficiency. Another identical bulb is connected across the mains as shown.
What is total power consumption?

A
$$20\ W$$

B
$$40\ W$$

C
$$30\ W$$

D
$$60\ W$$

Solution
Question 5
1 / -0

In the circuit shown here, bulb P will glow when

A
A is closed, Band C are open

B
A is closed, B is closed and C is open

C
A is closed, Band C are closed

D
Both B and C.
Solution
In the circuit here, bulb P will glow when the circuit is complete.
The circuit should not be broken at any point.It should be continous at every point.
At A only one path is present so A has to be closed in every situation.
But from B and C even if one switch is closed the circuit will be complete.And in case both B and C are closed even then the circuit will be complete.
Thus answers are:
A closed, B closed and C open. OR
A closed ,B and C both closed.
Thus, both option (B) and (C) are correct.
Correct option - (D).
Question 6
1 / -0

Directions For Questions

In the circuit diagram shown below:

...view full instructions

What will be the order in which the bulbs $$A,\ B,$$ and $$C$$ will glow when the switch is moved to the 'on' position?

A
First $$B$$ then $$C$$ and then $$A$$

B
First $$A$$ then $$B$$ and then $$C$$

C
First $$A$$ then $$B$$ and $$C$$ together

D
All the bulbs will glow together

Solution

When the switch is moved to the on position, the circuit is closed. All the bulbs will glow together.
Question 7
1 / -0

Symbol of switch in 'ON' position is -

A

B

C

D

Solution

Third option is the symbol of 'on' switch.

Answer-(C)
Question 8
1 / -0

Directions For Questions

In the circuit diagram shown below:

...view full instructions

Would any of the bulbs glow when the switch is in the 'off' position?

A
Bulb $$A$$

B
Bulb $$B$$

C
Bulb $$C$$

D
None of the above

Solution

When the switch is in the 'off'. position, no bulb will glow as the circuit is incomplete and no current flows through the circuit.Also these bulbs are in series which means that if current through one lamp is zero , current through every lamp will be zero and no bulb will light up.
Correct option is (D).
Question 9
1 / -0

Bulbs of rating 60W, 220V and 250W, 220V are connected in series and their combination is connected to 440 V supply. Which bulb will fuse?

A
60W

B
250 W

C
Both

D
Neither.
Question 10
1 / -0

Three 100 W light bulbs are connected in series to a 220 V power source.If two of the light bulbs are replaced by 60 W bulbs the brightness of the remaining 100 W bulb is

A
Brighter than it was before

B
Dimmer than it was before

C
The same brightness as it was before

D
Will not illuminate

Solution