Samacheer Kalvi 6th Science Term 3 Unit 1 Book Back Questions and Answers:
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Samacheer Kalvi 6th Science Book Back Chapter 1 Term 3 Solutions Guide PDF:
TN State Board Class 6th Science Subject Term 3 Unit 1 one mark and two mark solutions guide PDF available below.
6th Science – Term 1
Unit 1 – Magnetism
I. Choose the appropriate answer:
1. An object that is attracted by a magnet.
(a) wooden piece
(b) plain pins
(d) a piece of paper
(b) plain pins
2. People who made mariner’s compass for the first time.
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
c. hit with a hammer
c. hit with a hammer
5. Mariner’s compass is used to find the
II. Fill in the blanks:
- Artificial magnets are made in different shapes such as _______, _______ and _______
- The materials which are attracted towards the magnet are called _______
- Paper is not a _______ material.
- In olden days, sailors used to find direction by suspending a piece of _______
- A magnet always has _______ poles.
- Bar-magnet, Horseshoe magnet, Ring magnet
- magnetic substances
III. True or False. If False, give the correct statement:
1. A cylindrical magnet has only one pole.
False. A cylindrical magnet has two poles.
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.
False. Maximum iron filings stick in the poles of a bar magnet when it is brought near them.
4. A compass can be used to find East-West direction at any place.
True. A magnetic compass always points towards the North-South direction. If the North-South direction is known, then the East-West direction can also be determined. This direction is perpendicular to the North-South direction, ie., perpendicular to the compass needle in the same plane.
5. Rubber is a magnetic material.
False. Rubber is anon-magnetic material.
IV. Match the following:
- Compass – Maximum magnetic strength
- Attraction – Like poles
- Repulsion – Opposite poles
- Magnetic poles – Magnetic needle
1 – iv; 2 – iii; 3 – ii; 4 – i
V. Circle the odd ones and give reasons:
1. Iron nail, pins, rubber tube, needle.
The rubber tube is a non-magnetic substance, others are magnetic substances.
2. Lift, escalator, electromagnetic train, electric bulb.
The electric bulb does not have magnets others have electromagnets.
3. Attraction, repulsion, pointing direction, illumination.
Illumination is not a property of magnet, others are magnetic properties.
VI. Give a Short Answer:
1. Explain the attraction and repulsion between magnetic poles.
- Like poles (N – N, S – S) repel each other.
- Unlike poles (N – S, S – N) attract each other.
2. A student who checked some magnets in the school laboratory found out that their magnetic force is worn out. Give three reasons for that?
Magnets lose their properties if they are:
- dropped from a height
- hit with a hammer
These are the reasons for that their magnetic force is worn out.
VII. Answer in detail:
1. You are provided with an iron needle. How will you magnetize it?
- Place the iron needle on the table.
- Take a bar magnet and place one of its poles near one edge of the iron needle.
- Rub from one end to another without changing the direction of the pole of the magnet.
- Repeat the process 30 to 40 times. The needle will be magnetized.
- If it will not attract pin or iron fillings continue the same process for some more time.
2. How does an electromagnetic train work?
- Electromagnets are used in Electromagnetic trains.
- Electromagnets are magnetized only when current flows through them.
- When the direction of the current is changed, the poles of the electromagnets are also changed.
- Like poles of the magnets which are attached at the bottom of the train and rail track repel each other.
- So, the train is lifted from the track up to a height of 10 cm.
- We know that we can move any magnetic object with the force of attraction or repulsion properties of magnets.
- This train also moves with the help of the magnets attached to the sides of the track and the magnets fitted at the bottom sideway of the train.
- By controlling the current, we can control the magnets and movement of the train.
Other Important links for Class 6th Book Back Answers:
Tamil Nadu Class 6th Standard Book Back Guide PDF, Click the link – 6th Book Back Questions & Answers PDF
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