Electric Current and its Effects Online Test

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Electric Current and its Effects

Description: All about electric current and its effect.
Number of Questions: 15
Created by: Rani Rajan
Tags: Electric current Mechanism of Production of Sound in Humans Electric Current and its Effects Symbols for Electric Circuit Components Making of an Electric Circuit Diagram Heating Effects of Electric Current Working and Usage of Electric Fuses Magnetic Behavior of Current Carrying Wire

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It is always said that before buying any electric device, one should look for the ISI mark on it. What does this mark ensure?

The product conforms the Bureau of Indian Standards.
The device is safe to use.
The device results in less wastage of electricty.
The device is original.
All of the above

Certain symbols in electric circuit diagrams are used to

represent different components
understand the circuit
make the diagram more attractive
Only 1 and 2
1, 2 and 3

A closed loop giving a return path to the electric current is

electric path
electric circuit
electric network
electric current
None of these

Which of the following devices can be used to reduce the maximum wastage of electricity and still glow bright?

Compact fluorescent lamp
A blue coloured bulb
Halogen lamp
LED bulb
None of these

Which of the following reasons is/are correct behind the using of tungsten in an incandescent bulb?

It is lustrous and shining.
It has very high melting point.
It has a low melting point.
It is a bad conductor of heat.
All of the above

The heating of a heater does not depend upon the

material of the wire used
length of the wire used
colour of the wire used
thickness of the wire used
None of these

The minimum number of cells required to make a battery is

Which of the following problems will arise when the insulation of the wires has come off resulting in the direct touching of wires in a circuit?

Short circuit
Overloading
Fluctuation
Circuit will not be complete.
None of these

After overloading of current in a wire, the circuit breaks by MCBs. How can the electric supply be resumed?

One has to replace the melted fuse wire with a new one.
One has to replace the MCB with a new one.
One has to switch it on.
One has to lessen the load.
None of these

A magnetic compass kept near a current conducting wire shows deflection because of the magnetic field produced by the current. It is oriented ______ of the current flow.

parallel and in the same direction
parallel, but in the opposite direction
perpendicular to the direction
at 45^o to the direction
None of these

What will happen to a metal wire through which current is flowing?

It will increase in length.
It will get hot.
It will glow.
It will vibrate.
All of the above

Which of the following is the use of argon filled in the bulb?

To prevent the filament from catching fire
To give strength to the inner wall of the bulb
To help it light
To prevent tungsten from melting fast
All of the above

What is the full form of MCB?

Major circuit breaker
Micro circuit breaker
Miniature circuit breaker
Major circuit board
Miniature circuit board

Why do heating appliances have a highly coiled element?

To increase the surface area
To increase the strength
To provide more heat
Only (1) and (3)
All of these

Which of the following is the odd one out?

Electric iron
Water heater
Geyser
Juicer
Toaster

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