Magnetic Effects of Electric Current Test

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Magnetic Effects of Electric Current Test - 15

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Question 1
1 / -0

What is the order of colour code for the insulation on the (a) live (b) neutral and (c) earth wire?

A
Brown, Blue and Green.

B
Blue, green and brown.

C
Green, blue and brown.

D
Green,brown and blue.

Solution

Electrical wires are covered with insulating materials. Every insulating material has a specific colour code that is used to identify the given wire is live, Neutral or earth wire.
For live wire - RED OR BROWN colours are used.
For neutral wire - BLUE OR BLACK colours are used.
and for earth wire - GREEN OR YELLOW colours are used.
Hence Option A
Question 2
1 / -0

What energy conversion does take place in a generator when it is in use?

A
The electrical energy changes into the electrical energy.

B
The mechanical energy changes into the mechanical energy.

C
The electrical energy changes into the mechanical energy.

D
The mechanical energy changes into the electrical energy.

Solution

The generation of electrical power requires relative motion between a magnetic field and a conductor. In a generator, mechanical energy is converted into electrical energy. The electricity produced by most generators is in the form of alternating current.
Question 3
1 / -0

What name is given to a cylindrical coil of diameter less than its length ?

A
Lactometer

B
Barometer

C
Bolenoid

D
Solenoid

Solution

A solenoid is a long coil containing a large number of close turns of insulated copper wire wound on a conducting or non-conducting material. The diameter of each of the circular coil is less than the total length formed by several circular coil wound on a soft iron core.
Question 4
1 / -0

If a positively charged particle is moving as shown in the figure, then it will get deflected due to magnetic field towards :

A
+x direction

B
+y direction

C
-x direction

D
+z direction

Solution

According to Fleming left hand rule, if we consider $$B$$ as our index finger, current (here it is velocity) as our middle finger and thumb is as the direction of the force, then our thumb will be in the positive z-direction.
Question 5
1 / -0

What does an electric generator generate?

A
Current

B
Magnetism

C
Gravity

D
Light

Solution

An electric generator is a device that converts mechanical energy to electrical energy using the principle of electromagnetic induction. Hence, it generates electric current for the supply of electrical power to consumers.
Question 6
1 / -0

A current is passed through a straight wire. The magnetic field established around it has its lines of forces :

A
circular

B
parabolic

C
elliptical

D
no fixed shape

Solution

The magnetic field lines forms concentric circles around a current carrying wire as shown in the figure.
Question 7
1 / -0

The AC produced in India changes its direction in every :

A
$$\displaystyle \frac{1}{100}$$ second

B
100 second

C
50 second

D
None of these

Solution

Answer is A.

In India, the frequency of AC voltage is $$50\ Hz$$.
It means $$50$$ waves will be produced in $$1\ s$$.
In one wave, the direction is changed $$2$$ times.
Thus, in 50 waves, the direction will be altered $$50\times 2=100$$ times.
i.e. the direction is changed $$100$$ times in $$1\ s$$.
Thus the direction is changed in every $$\dfrac{1}{100}\ s$$.
Question 8
1 / -0

Alternating current is one which changes in its :

A
direction

B
magnitude

C
magnitude and direction both

D
none

Solution

Answer is C.

An alternating current (AC) is an electric current whose magnitude and direction vary, unlike direct current, whose direction remains constant.

The usual waveform of an AC power circuit is a sine wave, because this leads to the most efficient transmission of energy. The sine wave oscillates periodically between positive and negative direction.
Question 9
1 / -0

When a bar magnet is broken into two pieces:

A
we will have a single pole on each piece

B
each piece will have two unlike poles

C
each piece will have two like poles

D
none of these

Solution

When we break a magnet into two, both act as magnets, that is both have a north and south pole each. In both these pieces the corresponding north and south poles remain on the sides as in the original magnet. This means that the 2 broken sides must get oppositely polarized.
Question 10
1 / -0

Magnetic field is a

A
Vector quantity

B
Scalar quantity

C
Scalar as well as vector quantity

D
Neither vector nor scalar

Solution

Answer is A.

The magnetic field at any point in space is a vector quantity. This means there is a direction associated with the field as well as a field strength. Consider the arrow below:
The direction of the arrows can be thought of as the direction of the magnetic field. The length of the arrows can be thought of as the strength of the field, i.e. the longer the arrows, the stronger the field.

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Magnetic Effects of Electric Current Test - 15

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Question 1

Brown, Blue and Green.

Blue, green and brown.

Green, blue and brown.

Green,brown and blue.

Solution

Question 2

The electrical energy changes into the electrical energy.

The mechanical energy changes into the mechanical energy.

The electrical energy changes into the mechanical energy.

The mechanical energy changes into the electrical energy.

Solution

Question 3

Lactometer

Barometer

Bolenoid

Solenoid

Solution

Question 4

+x direction

+y direction

-x direction

+z direction

Solution

Question 5

Current

Magnetism

Gravity

Light

Solution

Question 6

circular

parabolic

elliptical

no fixed shape

Solution

Question 7

$$\displaystyle \frac{1}{100}$$ second

100 second

50 second

None of these

Solution

Question 8

direction

magnitude

magnitude and direction both

none

Solution

Question 9

we will have a single pole on each piece

each piece will have two unlike poles

each piece will have two like poles

none of these

Solution

Question 10

Vector quantity

Scalar quantity

Scalar as well as vector quantity

Neither vector nor scalar

Solution

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