Electricity Test

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Electricity Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is/are good conductor(s) of electricity?

A
Metals, Quartz

B
Mica, Quartz

C
Metals, Rubber

D
Metals, Mica

Solution

Metals are electropositive in nature and are therefore, good conductors of electricity. Quartz is a chemical compound consisting of one part silicon and two parts oxygen (SiO₂). It is the most abundant mineral found in Earth's surface. Its unique properties make it one of the most useful natural substances. It has electrical properties and heat resistance that make it valuable in electronic products. Mica has superior electrical properties as an insulator. Rubber is also an insulator.
Question 2
1 / -0

When a steady current flows through a conductor, the electrons in it move with certain average speed known as:

A
Accelerated speed

B
Average velocity

C
Drift speed

D
Root mean square speed

Solution

The drift velocity is the average velocity that a particle, such as electrons, attains in a material due to a steady electric field. It can also be referred to as axial drift velocity.
Question 3
1 / -0

The function of rheostat in an electrical circuit is to:

A
Increase the resistance in the circuit.

B
Change the resistance in the circuit.

C
Decrease the resistance in the circuit.

D
None of these

Solution

A Rheostat is an electrical instrument used to control current in a circuit by varying the resistance. The resistance can be decreased or increased with the help of a rheostat.
Question 4
1 / -0

What is the resistivity of Nichrome?

A
110×10⁻⁸Ωm

B
12.9×10⁻⁸Ωm

C
10¹⁰−10¹⁴Ωm

D
1.60×10⁻⁸Ωm

Solution

Resistivity of Nichrome at room temperature is (100—150) × 10⁻⁸ohm metre.
Question 5
1 / -0

Which of the following is incorrect about the heat produced in a resistor?

A
Directly proportional to the time for which the current flows through the resistors.

B
Directly proportional to the resistance for a given current.

C
It is directly proportional to the square of the current.

D
None of these

Solution

According to Joule's law of heating, the heat produced in a resistor is directly proportional to the square of the current for a given resistance, directly proportional to the resistance for a given current and directly proportional to the time for which the current flows through the resistor. H = I²Rt
Question 6
1 / -0

‘Electrons are consumed in an electric circuit’.

The above statement is:

A
True

B
False

C
Partially true

D
Partially false

Solution

Electrons are not consumed in an electrical circuit. Energy provided to an electric circuit moves electrons through gadgets like electric iron, bulbs, etc.
Question 7
1 / -0

Which of the following fuse should be used for an electric iron of 1 kW when operated at 220 V?

A
7 A

B
1 A

C
5 A

D
3 A

Solution

Current rating of the fuse, I > P/V or I > 1000/220 or I > 4.55A. A fuse is a device used in electrical systems to protect against excessive current; hence, the appropriate fuse for the electric iron at 220 V would be that of 5 A.
Question 8
1 / -0

The melting point of Tungsten is:

A
3333^oC

B
4000^oC

C
3380^oC

D
3500^oC

Solution

Tungsten is remarkable for its robustness, especially the fact that it has the highest melting point of all the elements discovered. It has a melting point of 3380^oC.
Question 9
1 / -0

In an electric circuit, the direction of electric current is:

A
from the positive terminal to the negative terminal.

B
from the negative terminal to the positive terminal.

C
from the positive terminal to the positive terminal.

D
from the negative terminal to the negative terminal.

Solution

In an electric circuit, the direction of electric current is from the positive terminal of the battery to the negative terminal of the battery. This is as per convention. Electrons were not known at the time when the phenomenon of electricity was first discovered. Electric current was considered to be the flow of positive charges and the direction of flow of positive charges was taken to be the direction of electric current.

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Electricity Test - 10

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Electricity Test - 10

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Question 1

Metals, Quartz

Mica, Quartz

Metals, Rubber

Metals, Mica

Solution

Question 2

Accelerated speed

Average velocity

Drift speed

Root mean square speed

Solution

Question 3

Increase the resistance in the circuit.

Change the resistance in the circuit.

Decrease the resistance in the circuit.

None of these

Solution

Question 4

110×10−8 Ωm

12.9×10−8Ωm

1010−1014Ωm

1.60×10−8Ωm

Solution

Question 5

Directly proportional to the time for which the current flows through the resistors.

Directly proportional to the resistance for a given current.

It is directly proportional to the square of the current.

None of these

Solution

Question 6

True

False

Partially true

Partially false

Solution

Question 7

7 A

1 A

5 A

3 A

Solution

Question 8

3333oC

4000oC

3380oC

3500oC

Solution

Question 9

from the positive terminal to the negative terminal.

from the negative terminal to the positive terminal.

from the positive terminal to the positive terminal.

from the negative terminal to the negative terminal.

Solution

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110×10⁻⁸Ωm

12.9×10⁻⁸Ωm

10¹⁰−10¹⁴Ωm

1.60×10⁻⁸Ωm

3333^oC

4000^oC

3380^oC

3500^oC