Magnetism Book Back Questions 6th Science Lesson 15
6th Science Lesson 15
15] Magnetism
Book Back Questions with Answer and Do You Know Box Content
Do You Know?
The directive property of magnets has been used for centuries to find directions. Around 800 years ago, the Chinese discovered that a suspended lode stone stops in the north-south direction. Chinese used these lode stones to find directions.
The navigators of that country used to keep a piece of lode stone suspended in their boats and during a storm or mist, they used the lode stone to locate directions.
Magnets lose their properties when they are placed near Cell phone, Computer, DVDs. These objects will also get affected by magnetic field.
Choose the best answers:
1. An object that is attracted by magnet.
(a) Wooden piece
(b) Plain pins
(c) Eraser
(d) A piece of paper
2. People who made mariner’s compass for the first time.
(a) Indians
(b) Europeans
(c) Chinese
(d) Egyptians
3. A freely suspended magnet always comes to rest in the _________________
(a) North – East
(b) South – West
(c) East – West
(d) North – south
4. Magnets lose their properties when they are
(a) Used
(b) Stored
(c) Hit with a hammer
(d) Cleaned
5. Mariner’s compass is used to find the
(a) Speed
(b) Displacement
(c) Direction
(d) Motion
Fill in the blanks:
1. Artificial magnets are made in different shapes such as ______________, ________________ and ______________.
2. The Materials which are attracted towards the magnet are called ________________
3. Paper is not a ________________ material.
4. In olden days, sailors used to find direction by suspending a piece of ______________.
5. A magnet always has _____________ poles.
State true or false. If false, correct the statement:
1. A cylindrical magnet has only one pole.
2. Similar poles of a magnet repel each other.
3. Maximum iron filings stick in the middle of a bar magnet when it is brought near them.
4. A compass can be used to find East-West direction at any place.
5. Rubber is a magnetic material.
Match the following:
1. Compass – Maximum magnetic strength
2. Attraction – Like poles
3. Repulsion – Opposite poles
4. Magnetic poles – Magnetic needle
Circle the odd ones and give reasons:
1. Iron nail, pins, rubber tube, needle.
2. Lift, escalator, electromagnetic train, electric bulb.
3. Attraction, repulsive, pointing direction, illumination.
Answers:
Choose the best answers:
1. Plain pins 2. Chinese 3. North-South 4. Hit with a hammer 5. Direction
Fill in the blanks:
1. Bar magnet, Horseshoe magnet, Ring magnet 2. Magnetic substances 3. Magnetic 4.Lode stones 5.Two
Say True or False:
1. False
Correct Statement: A cylindrical magnet has two poles.
2. True
3. False
Correct Statement: maximum iron fillings stick in the poles of a bar magnet when it is brought near them.
4. True
Correct Statement: A compass always indicates the North-South direction. By using this property of magnets the East-West direction can be determined which is always perpendicular to the compass needle in the same plane.
5. False
Correct Statement: Rubber is a non-magnetic material.
Match the following:
1. Magnetic needle 2. Opposite poles 3. Like poles 4. Maximum magnetic strength
Circle the odd ones and give reasons:
1. Rubber tube (Rubber is a non-magnetic material; all the others are magnetic material)
2. Electric bulb (Electric bulb does not have electromagnets. All the other has electromagnets)
3. Illumination (Illumination is not a magnetic property all the other denotes the property of a magnet)