Test: Electricity and Magnetic Effect of Current - CTET & State TET MCQ

Electrons are negatively charged particles.

The substance that passes electricity is called conductor. Silver is a good conductor of electricity.

Tap water, salt solution and metal wire are the examples of conductors

In a cell, chemicals are used to produce potential difference.

Electromagnet loses its magnetic property when current is switched OFF.

OR

An electromagnet loses its magnetic power every time an electric current is removed and becomes magnetic once again when the electric field is introduced.

Common pin is made of iron so, it a magnetic material.

Aluminium and tap water are conductors of heat.

Roughly 4,000 years ago, a Greek shepherd named Magnes is said to have been tending his sheep in a region of northern Greece called Magnesia. He took a step and suddenly found that the nails that held his shoe together and the metal tip of his staff were stuck fast to the rock he was standing on! Intrigued, he began digging and discovered the first recorded lodestone. Lodestones were henceforth known as “magnetite,” probably named after Magnes or Magnesia.

Iron, nickel and cobalt are magnetic substances while silver is not a magnetic substance.

The magnetic pole near earth's geographic north pole is actually the south magnetic pole. When it comes to magnets, opposites attract. This fact means that the north end of a magnet in a compass is attracted towards the south magnetic pole, which lies close to the geographic north pole.

Dry cell has two terminals (+ve) and (-ve).

Filament of electric bulb is made up of tungsten, an alloy of metals having very high melting point.

A lodestone is a naturally magnetized piece of the mineral magnetite. They are naturally occurring magnets, which can attract iron. The property of magnetism was first discovered in antiquity through lodestones.

When two cells are joined together via connecting wires in such a way that the positive end of one cell is joined the negative end of another cell. This arrangement is called a battery. Thus, a battery is a combination of two or more cells.

A bulb has a filament which glows and two terminals which are joined to two terminals of the battery.

A circuit breaker can be used over and over again. The basic circuit breaker consists of a simple switch, connected to an electromagnet.

Generally electrical current requires a close path or circuit to flow, so when switch is off it won't flow. A switch prevents or allow the current to flow through it.

A horseshoe magnet is a magnet made in the shape of a horseshoe. At the ends of its legs, the magnet has two magnetic poles close together. This shape creates a strong magnetic field between the poles.

Fig: Horseshoe Magnet 

Only a closed circuit is a complete circuit.

Hans Christian Orsted was a Danish physicist and chemist who discovered that electric currents creates magnetic fields, which was the first connection found between electricity and magnetism.

Plastic is an insulator of electricity.

Magnet was first discovered about 5000 years ago in the rocks of magnesia.

Magnetism is the force exerted by magnets when they attract or repel each other. Magnetism is caused by the motion of electric charges.

The magnetic field of a bar magnet (for example) is strongest at either pole of the magnet. The force is weaker in the middle of the magnet and halfway between the pole and the center. If you sprinkle iron filings on piece of paper and place the magnet beneath it, you could see the path of the magnetic field lines.

An electric current is the rate of flow of electric charge past a point or region. An electric current is said to exist when there is a net flow of electric charge through a region. In electric circuits this charge is often carried by electrons moving through a wire.

Electromagnet is a magnet that works as magnet in presence of current only. It is based on magnetic effect of electric current.

Substances which allow electric current to pass through them.

Magnets attract iron due to the influence of their magnetic field upon the iron. When exposed to the magnetic field, the atoms begin to align their electrons with the flow of the magnetic field, which makes the iron magnetized as well. This, in turn, creates an attraction between the two magnetized objects.

In a battery two or more cells are combined in such a way that (+) terminal of one cell is joined to (-) terminal of other

Electric current originates because of the flow/drift of electrons and its direction is opposite to the direction of flow of electrons.