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WorksheetsMagnetism
Total questions: 28
Worksheet time: 12mins
The property of a magnet to attract magnetic objects is known as:
Magnetic field
Magnetism
Artificial magnets
Natural magnets
Plastic and wool are examples of magnetic substances
True
False
The human-made magnets are called natural magnets.
True
False
Magnetic field is defined as:
The force which is exerted by a magnet to attract magnetic substances
The region around a magnet where its magnetic force can be experienced
None of the above
The regions of strongest magnetism in a magnet are near:
It's poles
It's center
Between it's center and poles
None of the above
A freely suspended magnet always points towards the geographical:
north-east
east-west
south-west
north-south
Magnetic poles always exist in pairs
True
False
The south pole in a magnet repels the _____ pole
North
South
How will you define the term magnetic force?
The force exerted by a magnetic substance for being attracted
The force exerted by a magnet
None of the above
Magnetic lines of force are continuous straights
True
False
What is the direction of the magnetic lines of force inside a magnet?
North pole to south pole
East pole to west pole
South pole to north pole
None of the above
The Earth behaves as a huge ____ magnet
horseshoe
ring
bar
disc shaped
Around how much in the difference between the geographical and magnetic axes?
13 degrees
20 degrees
12 degrees
11 degrees
When do temporary magnets lose their magnetic properties?
When people stop calling them temporary
When the magnetizing force is removed
None of them
Two simple ways of magnetizing a magnetic material are:
Single touch method and double touch method
Throwing it in water or rubbing against another magnetic substance
The core of an electromagnet is generally made up of
Wood
Wires
Soft Iron
Magnets are used in magnetic compasses
True
False
Electromagnets are useless
True
False
The method of 'Magnetizing by induction' is generally used to make what type of magnets?
Permanent magnets
Temporary magnets
GIVE REASON:-
Soft iron is generally used for making the core of an electromagnet.
It is a magnetic substance
It is soft to touch and hence doesn't hurt the user's hands
Iron does not retain it's magnetism once the current is switched off
None of the above
What happens if steel is placed as the core of an electromagnet?
It keeps the coil steady
It is just there to replace the soft iron
It gives the electromagnet a better look
It makes such a strong current pass through the coil that an electromagnet can become a permanent one
Why do doctors need to use small magnets?
To attract all the magnetic substances they for their work
To remove iron splinters from eyes.
None of the above
Electromagnets are used in mining industries to separate iron ores.
True
False
Which of the following is a way to demagnetize a magnet?
Hammering the magnet several times
Rubbing the magnet against a cloth
Cooling it on a very low temperature
STATE TRUE OR FALSE:-
If the poles of a magnet are left free for a long time, self-demagnetization occurs.
True
False
Why are magnetic keepers used?
To avoid mutual attraction or repulsion between the magnets which causes them to loose their magnetic strength
To hang them on the wall as a showpiece
To avoid rusting
None of the above
A magnetic keeper is a:
Soft copper bar
Soft steel bar
Soft cobalt bar
Soft iron bar
How many magnetic keepers are used for a U-shaped or a horseshoe magnet?
6 magnetic keepers
1 magnetic keeper
4 magnetic keepers
2 magnetic keepers
