Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

What is incorrect about CFLs?

A
They gives out a lot of heat

B
They reduce wastage

C
They can be fixed in the ordinary bulb holders

D
None of these

Solution

Compact fluorescent lamps (CFLs) give out less heat then ordinary bulbs, reduce wastage and can be fixed in the ordinary bulb holders hence option $$A$$ is incorrect.
Question 2
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In which direction will the compass needle put parallel to the upper wire (such that the north pole of the needle is towards the coil) show deflection when the switch in the circuit as shown in the diagram is closed?

A
The needle will deflect left

B
The needle will deflect right

C
There will be no deflection at all

D
None of the above

Solution
Question 3
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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 4
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Symbol of switch in 'ON' position is -

A

B

C

D

Solution

Third option is the symbol of 'on' switch.

Answer-(C)
Question 5
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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 6
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Identify the circuit (Figure 12.3) in which the electrical components have been properly connected

A
(I)

B
(II)

C
(III)

D
(IV)

Solution

Hint: Check the connections of the Voltmeter and Ammeter.

Step 1: Checking if the Voltmeter is connected in parallel and Ammeter is connected in series.

In circuits $$(i)$$ and $$(iii)$$, Voltmeter is connected in series. In circuit $$(iii)$$ the ammeter is connected in parallel. In circuits $$(i)$$ and $$(iii)$$, connections are not proper.

In circuits $$(ii)$$ and $$(iv)$$, the Voltmeter and Ammeter are connected in parallel and series respectively.

Step 2: Checking if the terminals are connected properly.

In circuit $$(iv)$$, the positive terminal of the ammeter is connected with the negative terminal of the cell. Hence it is not proper.
Whereas in circuit $$(ii)$$, all the terminals are properly connected. Therefore option $$(B)$$ is the correct option.
Question 7
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The diagram shows the circuit of an door bell. What happens when the bell button is switched on then switched off?
Switch on Swithc off
(A) $$1$$ ting is heard Silence
(B) $$1$$ ting is heard $$1$$ ting is heard
(C) Continuous Silence
(D) Silence Continuous ringing

A
A

B
B

C
C

D
D

Solution

In the given bell circuit, when we press the bell button (switched on), current will flow through the circuit and the solenoid will become magnetised. It will produce magnetic field that will attract the soft iron which will hit the gong 1. So a ting will be heard.
After switching off, the solenoid will become demagnetised and will not produce magnetic field. The soft iron won't be attracted. The hammer will come back to its mean position due to the pull of the spring metal strip. The other (right) face of the hammer will hit the gong 2. So another ting is heard.
Question 8
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What is the missing label at $$\star$$ ?

A
Contact Screw.

B
Pointer

C
Key

D
Brush

Solution

The element marked $$\star$$ is called the contact screw.
Contact screw completes the circuit in an electric bell. When the iron strip is in contact with the screw , the current flows through the coil and it becomes an electromagnet. The hammer at one end of iron strip strikes the gong and bell is rung.
Question 9
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Directions For Questions

Three specimens of-magnetic material were tested using the apparatus shown in the diagram.
When the switch is closed, the specimen picks up some of the iron nails but when the switch is opened, many or most of the nails fall off. The number of nails picked up and left on were found for three specimens. The table shows the results.
Specimen Number of nails picked up Number of nails left on
X 35 4
Y 20 10
Z 40 3

...view full instructions

Which among the following pair of elements are suitable in the construction of electric bell?

A
X, Y

B
Y, Z

C
X, Z

D
X, Y, Z

Solution

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Question 10
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Which of the following is directly responsible for the production of sound in an electric bell?

A
The coil

B
The iron piece

C
The gong

D
The switch

Solution

The hammer at the end of the strip strikes the gong of the bell to produce a sound, thus option $$C$$ is correct.