Chapter 13 – fun
with magnets
ACTIVITY- 1 : To
separate magnetic and non-magnetic materials.
Question 1-
Materials attracted by a magnet are called _______ (Magnetic/Non-magnetic).
Answer- Magnetic.
Question 2-
Materials not attracted by a magnet are called _______ (Magnetic/Non-magnetic).
Answer- Non-magnetic.
ACTIVITY- 3 : A
freely suspended bar magnet always comes to rest in
North-South
direction. (Page No.- 136)
Question 1- A
freely suspended bar magnet always points towards direction:
(a) North-South (✓) (b) East-west
ACTIVITY- 4 : To
locate the position of magnetic poles.
Question 1- The
poles of a bar magnet are ________ to its ends. (Near/far)
Answer- Near.
Question 2- Bar
magnet has ______ poles.
Answer- Two.
ACTIVITY- 6 : Make
your own Compass.
Question 1-
Magnetic compass is a device to find the ________ of earth. (directions / time)
Answer- Directions.
ACTIVITY- 7 :
Attraction and repulsion between magnets.
Question 1-
Like poles of two magnets _________ each other. (Repel, Attract)
Answer- Repel.
Question 2-
Unlike poles of two magnets _________ each other. (Repel, Attract)
Answer- Attract.
EXERCISE
Question 1- Fill In
The Blanks.
a). Magnetite is
natural magnet.
b). Plastic is not a magnetic material.
c). A magnet has two
poles.
d). The poles of a bar magnet are at its ends.
e). Compass
is used for finding directions on earth.
Question 2- Write
True Or False.
a). Poles of a magnet can be separated. (False)
b). A magnet does not attract glass material. (True)
c). Magnet can damage memory devices. (True)
d). Magnetic compass always point towards East-West
direction. (False)
e). Magnets lose their property on hammering. (True)
Question 3- Match
The Column:-
Column A Column B
1. Wood a. Repel.
(3)
2. Iron b. Natural magnet (4)
3. North pole-North pole c.
Non-magnetic material (1)
4. Magnetite d. Attract (5)
5. North pole-South pole e. Magnetic material (2)
Question 4. Choose
The Correct Answer.
(i).
Non-magnetic material is:
a) Iron
b) Needle
c) Paper (✓)
d) None of them
(ii). Which can
be converted into magnet:
a) Eraser
b) Iron nail (✓)
c) wooden bar
d) None of these
Question 5- Very
Short Answer Type Questions.
(i) Write name
of any two things used in our daily life that contains magnet?
Answer- Door catcher, mobile cover, speaker, purse
etc.
(ii) When a bar
magnet placed on iron fillings, where the fillings will be attracted more?
Answer- Near the ends of bar magnet i.e. at poles.
(iii) What is
an artificial magnet?
Answer- Man made magnets are called artificial magnet.
(iv). Write any
two properties of magnet?
Answer- (i) Magnet aligns in North-South direction
when suspended freely.
(ii) A magnet has two magnetic poles.
Question 6- Short
Answer Type Questions.
(i) What is a
magnet? Name the poles of magnet?
Answer- A magnet is a substance which attracts iron
like things towards it. Magnet has two poles i.e. North pole and South pole.
(ii) Give three
reasons by which a magnet loses its property?
Answer- Magnet can lose its property by heating, by
hammering and by throwing from height.
(iii) What is a
compass? For what purpose it is used?
Answer- Magnetic compass is a device made up of
magnetic needle, that is used to find geographical directions on earth.
(iv). What are
magnetic and non-magnetic materials? Give examples?
Answer- Magnetic
materials- Materials like iron, nickel and cobalt are attracted towards
magnet. These are called magnetic materials.
Non-magnetic
materials- Materials like plastic, glass and wood are not
attracted towards magnet.These are called non-magnetic materials.
Question 7- Long
Answer Type Questions.
(i) How will
you make your own magnet from a given strip of iron? Describe.
Answer- Rub the iron strip with a bar magnet in one
direction about 40-50 times. The iron strip will attain the property of magnet.
(ii) Give some
uses of magnets in our daily life?
Answer- (1) All speakers and head phones have magnets.
(2) Electric bell works with electric magnet.
(3) Door catchers also have magnets.
(4) Buckles of some mobile covers and purses also has
magnets.
(5) Pin holders also have magnet due to which pins
stick to the holder.
