Electricity Test

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Electricity Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following option has no effect on an electric fuse wire?

A
Its specific resistance

B
Its radius

C
Its colour

D
Current flowing through it

Solution

A fuse is a safety device that provides overcurrent protection, to an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, interrupting the current that it connects.
Therefore the working of the fuse depends upon its resistance and current flowing through it.

Hence, the correct option is C.
Question 2
1 / -0

The direction of current in a cell is

A
- ve pole to +ve pole during discharging

B
+ve pole to -ve pole during discharging

C
Always -ve pole to +ve pole

D
Always flows from +ve pole to -ive pole

Solution

In the figure a circuit is shown in which a battery is attached with a load. and direction of current is shown.
hence current in a cell flows from -ve terminal to +ve terminal.
Question 3
1 / -0

When we pay for our electricity bill, we are paying for the:

A
charge used.

B
current used.

C
power used.

D
energy used.

Solution

Electricity bill is measured in units where 1 unit is equal to kWh which is the unit of energy. Hence, when we pay for our electricity bill, we pay for the amount of electrical energy consumed by us.
Question 4
1 / -0

Which one of the following is not the unit of energy?

A
joule

B
newton metre

C
kilowatt

D
kilowatt hour
Solution
$$\textbf{Hint:}$$ Use the relation between energy and power.
$$\textbf{Explanation :}$$
If Watt is unit of power then kilowatt is also the unit of power.
Work done = Force × Distance = Newton - metre, Therefore it is the unit of Work or Energy.
Energy = Power × time = kilowatt - hour, in fact it is the commercial unit of Energy.
Question 5
1 / -0

The electric current passing through a metallic wire produces heating because of:

A
collisions of conduction electrons with each other

B
collisions of the atoms of the metal with each other

C
the energy released in the ionisation of the atom of the metal

D
collisions of the conduction electrons with the atoms of the metallic wire

Solution

Answer is D.

A metallic conductor has a large number of free electrons in it. When a potential difference is applied across the ends of a metallic wire, the free electrons begin to drift from the low potential to the high potential region. These electrons collide with the positive ions (the atoms which have lost their electrons). In these collisions, energy of the electrons is transferred to the positive ions and they begin to vibrate more violently. As a result, heat is produced. Greater the number of electrons flowing per second, greater will be the rate of collisions and hence more heat is produced.
Hence, The electric current passing through a metallic wire produces heating because of collisions of the conduction electrons with the atoms of the metallic wire.
Question 6
1 / -0

If doubling the voltage across a resistor doubles the current through the resistor then

A
the resistor value decreased.

B
the resistor value increased.

C
the resistor value did not change.

D
it is impossible to determine the change in the resistor value.

Solution

As $$R = \dfrac{V}{I}$$
Now voltage = $$2V$$ and current = $$2I$$
So now resistance = $$\dfrac{2V}{2I}= \dfrac{V}{I}=R$$
Question 7
1 / -0

When the potential difference between two points is 1 volt and current through it is 1 A, then the resistance between the points is:

A
$$3 \, \Omega$$

B
$$2 \, \Omega$$

C
$$0.5 \, \Omega$$

D
$$1 \, \Omega$$

Solution

Given:
Potential difference $$V=1\ volt$$
Current $$I = 1\ A$$
From Ohm's law, $$V = IR$$
$$\therefore R = \dfrac{V}{I} = \dfrac{1}{1} = 1\ ohm$$
Question 8
1 / -0

What is the relation between resistance R and resistivity $$\rho$$ of a wire ?

A
$$R=\dfrac{\rho A}{l}$$

B
$$R=\dfrac{\rho l}{A}$$

C
$$R=\dfrac{A}{\rho l}$$

D
$$R=\dfrac{l}{\rho A}$$

Solution

resistivity is a measure of the resisting power of a specified material to the flow of an electric current. So resistance is directly proportional to resistivity of material used.
$$R\propto \rho $$
If length is larger then electron has to travel longer so resistance is directly proportion to length.
$$R\propto l$$
If cross sectional area larger electron gets sufficient space for travel so resistance is inversely proportion to cross sectional area.
$$R \propto \dfrac{1}{A}$$
hence
$$R = \rho \dfrac{l}{A}$$
Question 9
1 / -0

Electrical charge can be transferred from a charged object to another through :

A
Vacuum

B
Air

C
Insulators

D
Conductors

Solution

Electrical charge can be transferred from one object to another object through conductors. because conductors have free electrons that carry charges from one object to another object. whereas In insulators, they do not have free electrons so they can't transport charges exp: Air. Vacuums have no medium so it also behaves like insulators, therefore, they will not transfer charge.
Question 10
1 / -0

The specific resistance of fuse wire is:

A
High

B
Low

C
Zero

D
Infinity

Solution

Answer: B

A fuse wire is a type of high resistance wire that operates to provide overcurrent protection. It prevents flow of high current in the circuit.

Resistance for a particular conductor depends on its specific resistance, hence high resistance implies high specific resistance.

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Electricity Test - 19

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Electricity Test - 19

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Question 1

Its specific resistance

Its radius

Its colour

Current flowing through it

Solution

Question 2

- ve pole to +ve pole during discharging

+ve pole to -ve pole during discharging

Always -ve pole to +ve pole

Always flows from +ve pole to -ive pole

Solution

Question 3

charge used.

current used.

power used.

energy used.

Solution

Question 4

joule

newton metre

kilowatt

kilowatt hour

Solution

Question 5

collisions of conduction electrons with each other

collisions of the atoms of the metal with each other

the energy released in the ionisation of the atom of the metal

collisions of the conduction electrons with the atoms of the metallic wire

Solution

Question 6

the resistor value decreased.

the resistor value increased.

the resistor value did not change.

it is impossible to determine the change in the resistor value.

Solution

Question 7

$$3 \, \Omega$$

$$2 \, \Omega$$

$$0.5 \, \Omega$$

$$1 \, \Omega$$

Solution

Question 8

$$R=\dfrac{\rho A}{l}$$

$$R=\dfrac{\rho l}{A}$$

$$R=\dfrac{A}{\rho l}$$

$$R=\dfrac{l}{\rho A}$$

Solution

Question 9

Vacuum

Air

Insulators

Conductors

Solution

Question 10

High

Low

Zero

Infinity

Solution

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