Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is not a component of electric bell?

A
Gong

B
Ferromagnetic strip

C
Low magnetic field permanent magnet to attract ferromagnetic strip

D
None of the above

Solution

Electric bell works on the mechanism of electromagnets i.e, temporary magnets, and no permanent magnet is used.
Temporary magnet allows the ferromagnetic strip to return back to its initial state as switch is released.
Question 2
1 / -0

Which of the following is a characteristic of a buzzer?

A
It has different mechanism from electric bell.

B
It has higher frequency of collision of gong and hammer

C
It uses only AC power supply

D
None of the above

Solution

In a buzzer, the simplest sort of doorbell, an electromagnet is used to operate a self-interrupting circuit. You can see how this system works in the diagram below. Click and hold the doorbell button to see how the buzzer works. ... This breaks the doorbell circuit, which shuts off the electromagnet.characteristic of a buzzer It has higher frequency of collision of gong and hammer
Question 3
1 / -0

Which pair is not correct for the instruments used in the laboratory and their uses from the following?

A
Voltmeter - To measure the electric potential differene

B
Ammeter - To measure the electric current

C
Galvanometer - To detect the presence of current

D
Resistor - To supply the electric energy to circuit

Solution

A resistor is an instrument which provides a resistance to the flow of current. Electric energy to the circuit is provided by a battery.
Question 4
1 / -0

What is the minimum number of cells require to make a battery?

A
5 cells

B
2 cells

C
1 cell

D
6 cells

Solution

A combination of two or more cells is called a battery.
The minimum number of cells require to make a battery is $$2$$.
Question 5
1 / -0

What is the full form of MCB?

A
Micro Circuit Breakers

B
Miniature Circuit Breakers

C
Miniature Circuit Builders

D
Mega Circuit Blockers

Solution

An MCB or miniature circuit breaker is an electromagnetic device that is used as a safety device in the circuit.
Question 6
1 / -0

Which of the following will produce maximum wastage of electricity ?

A
CFL

B
Electric bulb

C
LED lights

D
All are power savers

Solution

The electric bulb works by heating up a small wire called the filament. Electric current heats the filament so much that it glows. In fact, $$90\%$$ of the electricity used by a electric bulb is converted to heat and this conversion produces maximum wastage of electrical energy.
Question 7
1 / -0

Choose the correct combination of cells to form a battery

A

B

C

D
All of the above

Solution

A cell has two terminals - positive and negative. When two or more cells are connected end to end, i.e. positive end is connected to the negative end, then it forms a battery. Therefore all the above combinations of cells are indicating the formation of a battery.
Question 8
1 / -0

Electromagnet can be weakened by ______ the current and strengthened by ______ the current. Fill in the blank.

A
Increasing, increasing

B
Decreasing, increasing

C
Increasing, decreasing

D
Decreasing, decreasing

Solution

Electromagnets are formed by passing an electric current through a wire coiled around the substance with an iron core. The electric current generates a magnetic field around the substance and thus magnetize it which convert it into a magnet. Lesser is the amount of current flowing, lesser is the strength of the electromagnet formed and vice-versa.
Thus option B is correct.
Question 9
1 / -0

Electromagnets are used in which of the following?

A
Speaker

B
Motor

C
Generator

D
All of the above

Solution

Electromagnets are formed by passing an electric current through a wire coiled around the substance with iron core.
Electromagnets are used to speaker, motor and generator.
Question 10
1 / -0

A student sets up a circuit containing a battery of two cells and three lamps, as shown.
What is the circuit diagram for this arrangement?

A

B

C

D

Solution

The correct option is $$(A)$$.

From the figure, it is clear that , two cells are connected in series, two bulbs are connected in parallel and one bulb is connected in series with parallel combination of two bulbs.