Electricity and Circuits Test

Result

Electricity and Circuits Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

If an electric current is passed through a cut potato for some time, then there would be a colored spot on the potato around one wire and no such spot around the other wire.
State the colour of the spot.

A
Greenish blue

B
Black

C
Brownish yellow

D
Reddish purple

Solution

The potato turns greenish blue when connected to the positive terminal, the electrons from the negative terminal of the battery move inside the potato as the electrolysis occurs at the copper wire inside potato. This electrolysis conducted by the presence of starch in potato which produces more electrons.
Question 2
1 / -0

Which one of the following will not conduct electricity?

A
solid NaCl

B
$$CuSO_4$$ solution

C
graphite

D
acidified water

Solution

A substance can only conduct electricity if it contains charged particles (electrons or ions) that are free to move around. In solid sodium chloride, there are ions but these ions are locked into the ionic lattice and are unable to move.
NaCl (common salt) is solid in state and solid ions or compounds don't conduct electricity. It needs to be either melted, molten or dissolved in a solution (i.e. water) first. Only then will the electrons be free to move to either the Cathode (-ve) or to the Anode (+ve). In a liquid state the electrons are free enough to move.
Question 3
1 / -0

In which circuit will the bulb or bulbs glow the brightest?

A
A simple circuit with one bulb and one cell

B
A simple circuit with one bulb and two cells

C
A simple circuit with two bulbs and one cell

D
A simple circuit with two bulbs and two cells

Solution

(A) Option :-
A simple circuit with one cell and one bulb
power $$=\dfrac { { V }^{ 2 } }{ R } =\dfrac { { V }^{ 2 } }{ R } $$
(B) Option: A simple circuit with two cell a one bulb
power $$=\dfrac { (2V)^{ 2 } }{ R } =\dfrac { 4{ V }^{ 2 } }{ R } $$
(C) Option: A simple circuit two bulbs and two cells
power $$=\dfrac { (2V)^{ 2 } }{ R } =\dfrac { 2{ V }^{ 2 } }{ R } $$
(D) Option : A simple circuit with two bulbs and one cell
power $$=\dfrac { { V }^{ 2 } }{ 2R } $$
We see that in (B) option P is highest bulb will glow in (B) option.
Question 4
1 / -0

Electric energy is produced from the ............ stored inside the cell.

A
Chemicals

B
Insulator

C
Transistor

D
None of these.

E
Answer required

Solution
Question 5
1 / -0

Some matters do not allow the electricity to pass through it. What is called a matter which does not allow the electricity to pass though it?

A
Conductor

B
Insulator

C
Semiconductor

D
All of these

E
None of these

Solution

Substances which do not allow electricity to pass through them are called insulators.Examples: Mica,Plastic.
Question 6
1 / -0

What happens to a circuit when the switch is off?

A
The circuit is complete

B
The circuit is now an open circiut

C
Electricity flows continuously

D
Electricity flows discontinuously

Solution

When the circuit switch is off, no electricity will flow and then the circuit is called an open circuit. Electricity will not flow in open circuit.
Question 7
1 / -0

This symbol is -

A
Switch in 'OFF' position

B
Electric bell

C
Switch in 'ON' position

D
Electric bulb

Solution

The given symbol is the symbol of a switch in the 'ON' position. The switch is closed as both of its terminals are connected and provide a closed path for the current to flow through it.

Answer-(C)
Question 8
1 / -0

What is symbol of switch in 'OFF' position?

A

B

C

D

Solution

Second option is the symbol of switch in 'OFF' position. It shows the switch is OPEN.

Answer-(B)
Question 9
1 / -0

Electric current cannot flow through

A
Silver

B
Wood

C
Copper

D
None of these

Solution

Wood is an insulator and hence does not allow electric current to pass through it.

Answer-(B)
Question 10
1 / -0

The path along which electric current flows is called

A
electric circuit

B
insulator

C
conduct

D
resistor

Solution

An electric circuit is a path in which electrons from a voltage or current source flow. The point where those electrons enter an electrical circuit is called the "source" of electrons. The point where the electrons leave an electrical circuit is called the "return" or "earth ground".