Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 12

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Question 1
1 / -0

What does this symbol mean in electric circuit?

A
Transformer

B
Battery

C
Capacitor

D
None of these

Solution

The given symbol is for $$transformer$$ in electric circuit.

Answer-(A)
Question 2
1 / -0

When the switch of an electric bell is pushed.

A
Flow of the current stops through the electromagnet in the bell

B
Current starts to flow through the electromagnet

C
Voltage decreases in the circuit

D
None of the above

Solution

When the swithch of electrical bell push, circuit will complete and current will start to flow.
Question 3
1 / -0

Is the symbol of

A
Plug key

B
Load

C
Heater

D
Bulb

Solution

The symbol shown in the above figure represents a load whereas the symbol for heater is same as that of resistor.
Question 4
1 / -0

What does this symbol mean in an electric circuit?

A
resistance

B
capacitace

C
inductance

D
power source

Solution

The given symbol means $$resistance$$ in an electric circuit.

Answer-(A)
Question 5
1 / -0

Choose the correct alternative which matches the second and third columns with the first column.

A
$$(I)-(b)-(ii);\ (II)-(c)-(iv);\ (III)-(a)-(i);\ (IV)-(d)-(iii)$$

B
$$(I)-(a)-(i);\ (II)-(b)-(iii);\ (III)-(c)-(iv);\ (IV)-(d)-(ii)$$

C
$$(I)-(d)-(iii);\ (II)-(b)-(iv);\ (III)-(a)-(i);\ (IV)-(c)-(ii)$$

D
$$(I)-(C)-(iv);\ (II)-(a)-(ii);\ (III)-(d)-(i);\ (IV)-(b)-(iii)$$

Solution

(I) : A tap key is represented by the symbol (c) given in column II which is used to keep the circuit open.
(II) : An ammeter is represented by the symbol (a) given in column II and is connected in parallel to the circuit.
(III) : A voltmeter is represented by the symbol (d) given in column II and is connected in series to the circuit.
(IV) : A galvanometer is represented by the symbol (b) given in column II which is connected to the circuit to detect current.
Question 6
1 / -0

Which of the following is the symbol of ground connection?

A

B

C

D

Solution

Option A is the symbol of the battery.
Option B is the symbol of a cell.
Option C is the symbol of earth grounding, i.e., ground connection.
Option D is the symbol of a light-emitting diode.
Question 7
1 / -0

While making a battery ______________ of a cell is connected to ___________ of other cell.

A
negative terminal , negative terminal

B
positive terminal , negative terminal

C
positive terminal , positive terminal

D
neutral terminal ,negative terminal

Solution

In order to make a battery the positive terminal of one cell is connected to the negative terminal of the other cell.
Question 8
1 / -0

Which of the following devices can be used to break an electric circuit:

A
Cell

B
Bulb

C
Switch

D
None of these

Solution

The switch is a simple device that is used to either break the electric circuit or to complete it.
Question 9
1 / -0

Why CFL is better in comparison to bulb ?

A
Because bulb produce heat which results in wastage of electricity and CFL saves electricity.

B
Because bulb produce heat which results in production of more electricity than CFL

C
Because CFLs size is bigger than bulb

D
Because CFL produce heat which results in saving of electricity.

Solution

$$1.$$ Bulb work by heating up a small wire called a filament. Electric current heats the filament so much that it glows.
$$2.$$ This bulb really is more of a heating element that happens to put out some light.
$$3.$$ In fact, $$90\%$$ of the electricity used by a bulb is converted to heat and this conversion is wastage.
$$4.$$ Whereas, the CFL is just like standard fluorescent light, compact and work by exciting gases with electricity.
$$5.$$ Because little heat is generated, most of the electricity used goes directly into providing light.
So, since bulb produce more heat and results in wastage of electricity and CFL saves electricity, that"s why CFL is better in comparison to bulb.
Question 10
1 / -0

The symbol of a switch in a closed circuit:

A

B

C

D

Solution

The second image is of a closed switch.
The first image represents the bulb.
The third image represents an open circuit.
The fourth image represents a short circuit.