Science [1 Marks Each] M.C.Q.

Left and then go straight.

Compass

A compass can be used to find all the directions of a place.

If the piece is a magnet, it comes to rest in the north - south direction when suspended freely with a thread.
So, he does not need anything more.

Here, are all the statements are correct.

The region of a magnet where the attraction of magnet is the strongest are called poles of the magnet.
We know that a magnet has always two poles (whatever its shape may be), one pole of the magnet is called north pole and the other pole of magnet is called south pole.
If a bar magnet is put into a heap of iron filings, then the iron filings will clinging to it or stick to it.
The maximum amount of iron filings cling to the two ends of the bar magnet because some force of attraction also exists in the middle part of the bar magnet but it is very small.

Compass has a needle, which is itself a magnet.

Lodestone

Magnetite

Those materials which are attracted by magnet are called magnetic materials.
Iron, steel, nickel and cobalt are attracted by magnet.
So, iron, steel, nickel and cobalt are magnetic materials.
The most common and important magnetic materials are however Iron and Steel.

Iron is attracted by magnet.

A freely suspended magnet always point in a north-south direction.

The amount of iron filings clinging to the North pole is almost equal to the South pole because in a magnet, the strength of both the poles is same.

The effect of magnetic field cannot pass through any metal. Magnetic effects can pass through screens of substances such as plastic, paper, glass etc.

All of these are attracted towards a magnet.

We know that there are two most important properties of magnets are:

1. A freely suspended magnet always point in the north south directions and
2. Like magnetic poles repel each other, unlike magnetic poles attract each other.

As, north pole brought near to south pole of another magnet which attracts.

Magnetic field line is directed from North Pole to South Pole outside the magnet. So option is correct.

The force of attraction of a magnet is maximum at its poles.

All of the given options use permanent magnets.

Poles

All of these

Temporary magnet

Lodestone

A nickel wire is attracted by magnet.
Those materials which are attracted by magnet are called magnetic materials.
Iron, steel, nickel and cobalt are attracted by magnet.
So, iron, steel, nickel and cobalt are magnetic materials.
The most common and important magnetic materials are however Iron and Steel.

Don’t hammer, drop and heat the magnets.

Magnetic effect pass through screen of substances like cloth, paper plastic.

Magnetite

It demagnetises.

Here, are all the statements are correct.

Soft iron pieces which are placed across the ends of bar magnets when stored are called magnetic keepers.

All of these

Magnetic field is the region around a magnet in which magnetic force is experienced by a magnetic material.

Magnetite does not show magnetic properties.

Magnete

The magnetic and non - magnetic properties of various objects are made use of in our day to day life.
We know that magnets attract only magnetic materials.
Due to this property, we use magnet as different ways.
Such as magnets are used in door stoppers in home and offices to hold the door open.
Magnets are also used in some pencil boxes to keep their lids shut tightly and so on.

The magnets made by using electricity are called electromagnets.
Electromagnets are very useful because their magnetism or power of attraction can be switched “on” or “off” as desired.
That means it is temporary magnet.
As an example, if the electric current is switched on through its coil the electromagnet gets its magnetism and starts behaving like a magnet,
when it is switched off the electromagnet losses all its magnetism that means (it no longer behaves as a magnet).
So, it is considered as temporary magnet.

Magnetic

Magnetic poles (North pole and South pole)

The needle of a compass is a magnet.
The earth too is a magnet as the needle tends to align itself to the earth's north pole.
The magnetic field of the earth can cause the needle to point in the north direction.

Magnetic field intensity is maximum at the poles of a bar magnet.

A torch does not contain a magnet in it.

The match box must contain some magnetic material i.e., steel ball bearing.

Magnets are used in many household articles to facilitate frequent usage.

Magnetite

Glass

Magnetite contains iron.