Electric Current and its Effects Test

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Electric Current and its Effects Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

When current passes through an electric bulb, its filament glows, but the wire passing current to the bulb does not glow because

A
less current flows through the wire as compared to the filament

B
the wire has more resistance than the filament

C
the wire has less resistance than the filament

D
the filament element has a coating of fluorescent material on it

Solution

The connecting wires has less resistance than the filament of the bulb, so less amount of heat is generated in the connecting wires, whereas large amount of heat is generated in the filament.
Question 2
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What will happen if you join the two terminals of a cell without connecting them through a switch or a bulb?

A
The electric cell will burn due to large amount of current.

B
The chemicals in the electric cell get used up very fast.

C
The electric cell, due to the flow of large amounts of current, gets corroded.

D
All of the above

Solution

When we join the two terminals of a cell without connecting them through a switch or a bulb, very large current flows through the circuit and whole of the chemical energy is utilised in a very short duration of time.
Question 3
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The strength of an electromagnet can be influenced by

A
increasing the current through the wire

B
increasing the number of loops in the coil

C
changing the core of the coil

D
All of the above

Solution

We can change the magnetic field of an electromagnet by changing the current, the number of turns and the core of the coil.

The greater the current, the greater the magnetic field, the greater the number of turns, the greater the magnetic field.
Question 4
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Which of the following statements is correct for the movement of electrons between two points?

A
There should be a temperature difference between the two points.

B
There should be a potential difference between the two points.

C
Both the points must be at the same potential.

D
Electrons can even flow without any temperature or potential differences between the two points.

Solution

There should be a potential difference between the two points of the conductor to flow the charge through the conductor. The greater the potential difference across the two points, the greater the current through the conductor.
Question 5
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Voltage can be generated

A
by rubbing certain types of materials against each other

B
by means of chemical reactions

C
using magnetic influence on conductors

D
All of these

Solution

We can generate the voltage across two points by rubbing two materials against each other. By doing this, transfer of electrons can take place. The material which loses the electrons becomes positively charged and the other becomes negatively charged. Hence, we create a voltage.

We can create a voltage by converting chemical energy into electrical energy, e.g. dry cell.

We can create a voltage across the two ends of the rod by moving it through the magnetic field.
Question 6
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Read the following statements and choose the correct option.

Statement A: Bulb filament is made of tungsten.
Statement B: Filament should have a low melting point.

A
Both statement A and statement B are correct.

B
Statement A is correct, but statement B is incorrect.

C
Statement A is incorrect, but statement B is correct.

D
Both statements A and B are incorrect.

Solution

Statement A is correct, but statement B is incorrect.
Filament of the bulb should have high melting point.
Question 7
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When a fuse is rated 8 A, it means

A
it will not work if current is less than 8 A

B
it has a resistance of 8 ohms

C
it will work only if current is 8 A

D
it will burn if current exceeds 8 A

Solution

When a fuse is rated at 8 A, it means it will burn if current exceeds 8 A.
Question 8
1 / -0

Tungsten is mainly used for making filaments of electric bulbs because of its

A
low cost

B
high melting point

C
high electrical conductivity

D
low thermal conductivity

Solution

Tungsten is mainly used for making filaments of electric bulbs because it has high melting point.

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Re-Attempt Weekly Quiz Competition

Electric Current and its Effects Test - 1

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Electric Current and its Effects Test - 1

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SHARING IS CARING

Question 1

less current flows through the wire as compared to the filament

the wire has more resistance than the filament

the wire has less resistance than the filament

the filament element has a coating of fluorescent material on it

Solution

Question 2

The electric cell will burn due to large amount of current.

The chemicals in the electric cell get used up very fast.

The electric cell, due to the flow of large amounts of current, gets corroded.

All of the above

Solution

Question 3

increasing the current through the wire

increasing the number of loops in the coil

changing the core of the coil

All of the above

Solution

Question 4

There should be a temperature difference between the two points.

There should be a potential difference between the two points.

Both the points must be at the same potential.

Electrons can even flow without any temperature or potential differences between the two points.

Solution

Question 5

by rubbing certain types of materials against each other

by means of chemical reactions

using magnetic influence on conductors

All of these

Solution

Question 6

Both statement A and statement B are correct.

Statement A is correct, but statement B is incorrect.

Statement A is incorrect, but statement B is correct.

Both statements A and B are incorrect.

Solution

Question 7

it will not work if current is less than 8 A

it has a resistance of 8 ohms

it will work only if current is 8 A

it will burn if current exceeds 8 A

Solution

Question 8

low cost

high melting point

high electrical conductivity

low thermal conductivity

Solution

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