Science - Fun with Magnets
Exam Duration: 45 Mins Total Questions : 30
P | Q | R |
Magnets | Magnetic substances | Non-magnetic substances |
A few examples of substances are given below.
Iron, Cobalt, Nickel
To which group do they belong?
- (a)
P
- (b)
Q
- (c)
R
- (d)
P and Q
P | Q | R |
Magnets | Magnetic substances |
Non-magnetic substances |
After repeated rubbing with a magnet in the same direction, a piece of substance fails to get magnetised. To which group does it belong?
- (a)
P and Q
- (b)
Q and R
- (c)
Q
- (d)
R
P | Q | R |
---|---|---|
Magnets | Magnetic substances | Non-magnetic substances |
Articles from which of these group(s) can be attracted by a magnet?
- (a)
Only Pand Q
- (b)
Only Q and R
- (c)
Only Q
- (d)
R
P | Q | R |
---|---|---|
Magnets | Magnetic substances | Non-magnetic substances |
An object is repelled by a magnet. To which group does it belong?
- (a)
P
- (b)
Q
- (c)
R
- (d)
P and R
Which of the following are magnetic materials?
(i) Steel
(ii) Nickel
(iii) Aluminium
- (a)
Only (i) and (ii)
- (b)
Only (ii) and (iii)
- (c)
Only (i) and (iii)
- (d)
(i), (ii) and (iii)
Which of the following statements is true?
- (a)
The north pole of a magnet will attract the north pole of another magnet.
- (b)
Artificial magnets can be made from non-magnetic materials also
- (c)
Lodestone is an artificial magnet.
- (d)
Isolated magnetic poles do not exist.
Where does a compass work?
- (a)
Only in oceans or seas
- (b)
Only on land, where the earth magnetic field is strong
- (c)
Only on high mountains
- (d)
At all the places within the earth's magnetic field
Which of the following will NOT be attracted by a magnet?
- (a)
Iron
- (b)
Nickel
- (c)
Gold
- (d)
Cobalt
Soft iron pieces are placed across the ends of bar magnets when stored. What are such pieces called?
- (a)
Preservatives
- (b)
Keepers
- (c)
Compasses
- (d)
Poles
Nikhilesh has a small piece of metal and a thread. He wants to find whether the metal is a magnet or not. Which of these things would he need?
- (a)
A piece of magnetic substance
- (b)
A magnet or a compass
- (c)
A piece of non-magnetic substance
- (d)
He does not require anything more
Bhavya placed a magnet near a metal ball and observed that the ball moved away. What does she conclude about the metal ball?
- (a)
It is a magnet
- (b)
It is made up of aluminium.
- (c)
It is made up of copper
- (d)
It is not a magnet
Why should we pivot the compass needle on a sharp pin?
- (a)
To minimise the magnetic effect on the pin
- (b)
To maximise the magnetic effect on the pin
- (c)
To minimise the friction between the pin and the compass needle
- (d)
To ensure that the compass needle will not drop from the pivoted point
Which of the following does NOT contain a magnet in it?
- (a)
A torch
- (b)
A radio
- (c)
A fan
- (d)
Both (B) and (C)
Which of the following objects do NOT make use of a magnet?
- (a)
- (b)
- (c)
- (d)
A weak magnet Y is placed near a strong magnet X as shown in the figure.
How will the magnets move?
- (a)
Y will move away
- (b)
X will turn in clockwise direction
- (c)
Y will turn in anti-clockwise direction
- (d)
Both X and Y will turn clockwise
Which of the following figures does NOT show the poles correctly?
- (a)
- (b)
- (c)
- (d)
Satish magnetised a piece of iron marked W, X, Y and Z using the stroking method as shown in the figure.
- (a)
W
- (b)
X
- (c)
Y
- (d)
z
Which of the following shapes of a W magnet are possible?
- (a)
Only P and Q
- (b)
Only Qand R
- (c)
Only Rand P
- (d)
P, Q and R
A natural rock that has a property of attracting iron.
- (a)
magnet
- (b)
Iron ore
- (c)
magnetite
- (d)
magnesia
A freely suspended magnet will come to rest in
- (a)
any direction.
- (b)
East-West direction.
- (c)
vertical position.
- (d)
North-South direction.
A device used for finding directions with the help of magnetism is called
- (a)
scale
- (b)
magnetic wane.
- (c)
magnetic compass.
- (d)
none of these.
Magnets may lose their properties if they are
- (a)
heated.
- (b)
hammered.
- (c)
thrown from a height.
- (d)
all of these.
To keep our gadgets safe we should keep magnets away from
- (a)
computers and CDs.
- (b)
mobiles.
- (c)
music systems and cassettes.
- (d)
all of these.
Two similar poles of a magnet
- (a)
attract each other
- (b)
repel each other
- (c)
show no interaction
- (d)
join sideways to make a powerful magnet
An old lady has dropped her sewing needle. The needle can be easily found if we
- (a)
look carefully on the floor
- (b)
sweep the room very carefully
- (c)
use a magnet.
- (d)
none of these.
A crane with a magnet block on its long arm is very helpful
- (a)
in a junkyard
- (b)
in home
- (c)
in school
- (d)
on the road.
Which one of these will always point in the same direction?
- (a)
a magnetised needle attached to a cork that is suspended in water.
- (b)
a freely suspended magnet
- (c)
a magnetic compass needle
- (d)
all of these.
What will happen if a magnet is brought near a magnetic compass?
- (a)
there will be deflection in the needle
- (b)
the needle will rotate for some time
- (c)
the needle will not show any movement
- (d)
the like poles will attract and the North pole of the magnet will touch the south pole of the needle
Pick out the odd one on the basis of magnetism
- (a)
paper
- (b)
wood
- (c)
Plastic
- (d)
Iron
Iron nails got mixed up in saw dust while a carpenter was working. What should he do to get his iron nails back?
- (a)
The carpenter will have to winnow the saw dust away to get the iron nails.
- (b)
The iron nails will be sold as saw dust.
- (c)
The iron nails should be handpicked.
- (d)
The carpenter should use a magnet to remove his iron nai