Kerala Syllabus Class 6 Basic Science: Chapter 02 Marvel of the Magnetic Realm - Questions and Answers | Teaching Manual


Study Notes for Class 6th Basic Science - കാന്തികലോകത്തെ അത്ഭുതം | Text Books Solution Basic Science (English Medium) Chapter 02 Marvel of the Magnetic Realm. ഈ യൂണിറ്റിന്റെ Teaching Manual & Teachers Handbook എന്നിവയുടെ ലിങ്ക് ഈ പേജിന്റെ അവസാന ഭാഗത്തു നൽകിയിട്ടുണ്ട്. പഠന സഹായികൾ അയക്കാൻ താല്പര്യമുള്ളവർ ഈ നമ്പറിൽ വാട്സാപ്പ് ചെയ്യുക: 9497346250.

ഈ ബ്ലോഗ് അഡ്‌മിൻറെ രേഖാമൂലമുള്ള അനുമതിയില്ലാതെ ഈ ബ്ലോഗിൽ നൽകിയിരിക്കുന്ന ചോദ്യോത്തരങ്ങൾ, ഇതേരീതിയിലോ പി.ഡി.എഫ് രൂപത്തിലോ, മറ്റേതെങ്കിലും ഡിജിറ്റലോ, പ്രിന്റഡ് ഉൾപ്പെടെയുള്ള ഏതെങ്കിലും രൂപങ്ങളിലേക്കോ മാറ്റി മറ്റൊരു വെബ്സൈറ്റിലോ, ബ്ലോഗിലോ, യുട്യൂബ്, സോഷ്യൽ മീഡിയാ ഗ്രൂപ്പുകളിലോ ഉൾപ്പെടെ ഒരിടത്തും പ്രചരിപ്പിക്കാൻ പാടില്ലാത്തതാകുന്നു.

Std 6: Basic Science Chapter 02: Marvel of the Magnetic Realm - Questions and Answers
♦ Observe the images. Aren’t these objects familiar to you? Write down what they are.
• Pencil Box
• Purse
• Flip cover of mobile phone

♦ When these things are closed, why do they stick together so easily? 
Magnets are used as locks in pencil box, purse, Flip cover of mobile phone, etc. Here, a small magnet is used on one side and a small piece of iron is used on the other side. When they come closer, they stick together.

♦ Which objects are attracted by a magnet? 
iron, cobalt, nickel and steel.

♦ Difference between Magnetic Substances and Non-Magnetic Substances
• Magnetic substances are those that are attracted by a magnet. Iron, nickel, cobalt etc., are magnetic substances. 
• Non-magnetic substances are those which are not attracted by a magnet. Paper, plastic, gold, wood, etc., are non-magnetic substances.

♦ Which objects were attracted by the magnet and which were not?. Classify them as magnetic substances and nonmagnetic substances.
Magnetic substances Non-magnetic substances
• Nail
• iron filings
• Hinges
• Safety pins
• Screw driver
• Stapler pins
• Compass
• Ball Pins
• Gem clip
• Knives made of iron
• nickel coins
• Cloths
• Paper
• Wood
• Copper wire
• Plastic
• Rubber
• Glass
• Aluminium wire
• Stainless steel
• Silver
• Gold
♦ Write an experiment to prove that the magnetic force is greater at the poles.

• Experiment:

• Materials required: A Bar magnet wrapped in paper, Iron filings

• Procedure: Bring the wrapped bar magnet close to the iron filings.

• Observation: More iron filings stick to both ends of the magnet

• Inference: The force of attraction of a magnet is stronger at its ends. 

♦ What are Magnetic Poles?
Usually, the force of attraction of a magnet is stronger at its ends. These ends with stronger force of attraction are called the magnetic poles. Every magnet has two poles.

♦ Does a Magnet Exert Force? Write an Experiment.

• Materials required: Bar magnet, Pin

• Procedure: Place a magnet on a table. Keep a pin a little away from the tip of the magnet. Slowly move the pin closer to the magnet. 

• Observation: When the pin comes closer to the magnet, it is attracted towards the magnet.

• Inference: The magnet exerts a force in a certain area around it.

♦ What is a Magnetic Field?
The force exerted by a magnet is called magnetic force. A magnetic field is the region around a magnet where magnetic force is experienced. Magnetic field is invisible.

♦ Let’s Draw Magnetic Field Lines
• Experiment:

• Materials required: A rectangular glass sheet, A magnet, Iron filings
• Procedure: Arrange the rectangular glass sheet between the books as shown in the figure. Place a bar magnet under the glass sheet and sprinkle iron filings on the upper side of the glass sheet. Gently tap the glass sheet if necessary. 

• Observation: The iron filings are arranged in a specific pattern.

• Inference: This arrangement indicates the magnetic field lines.  
The above picture shows the magnetic field lines.

♦ How can we collect magnetic substances in the soil of the school ground and its surroundings? 
Get a magnet from the loudspeaker of an old music system. Tie the magnet wrapped with a thick paper to a rope and drag it through the soil for some time. Some substances stuck to the paper due to the attraction of the magnet. These substances are magnetic substances.
♦ Can you suggest a method to separate iron from a mixture of soil and iron?
By using a magnet, we can separate iron from a mixture of soil and iron
♦ Different Types of Magnets
♦ Write an experiment to identify the north and south of a magnet.
• Materials required: Stand, Thread, Bar magnet

• Procedure: Tie a thread in the middle of the bar magnet and suspend it freely. Observe the direction of the magnet when it comes to rest.

• Observation: The poles point to the north-south direction.

• Inference: A freely suspended magnet always points towards the North-South direction. The pole of the magnet that points towards the Earth's North is the North Pole of the magnet, and the pole that points towards the Earth's South is the South Pole of the magnet. 

♦ Magnetic Poles
• The pole of the magnet that points towards the Earth's North is the North Pole of the magnet, and the pole that points towards the Earth's South is the South Pole of the magnet. 
• They are denoted by the letters N and S, respectively. 
• To indicate the North pole of a bar magnet, a special mark is given. Usually, a white spot is used to mark the north pole.

♦ What happens if a magnet is broken into two pieces?
These pieces become two small magnets. 

♦ A device which uses a magnet to determine the direction. 
magnetic compass

♦ How can we make a magnetic compass?
• Materials required: Magnet, Needle, Thread, Cork

• Procedure: Thread the needle. Hold the thread and rub the needle from one end to the other end with a magnet for about 50 times in the same direction. Take a small cork. After removing the thread, pierce the needle into the cork or glue the needle to the top of the cork. Place this cork in a bowl of water. Observe the
direction of the needle on the cork. Change the direction of the cork. The needle always rests in the north-south direction. Mark the north pole on the needle.

♦ A freely suspended magnet always rests in the North-South direction. What is the reason for this?
The Earth acts as a magnet. This geomagnet has a magnetic field. The poles of the Earth’s magnet are in the North-South direction. The North Pole of the Earth is the South Pole of the geomagnet. The South Pole of the Earth is the North Pole of the
geomagnet. That’s why a freely suspended magnet always points in the North-South direction.

♦ Arrange the magnets as shown in the figure and record the observations. 
♦ Attraction and Repulsion
The same poles of different magnets are called like poles, and their different poles are called unlike poles. Like poles repel and unlike poles attract. 

♦ Place the magnets in the following manner. In each case, do their poles attract or repel? What is the reason? 
• Figure 1 - They repel each other because like poles repel.
• Figure 2 - They attract each other because unlike poles attract

♦ What are the General Properties of a Magnet?
• A magnet attracts magnetic substances.
• A magnet has two poles. 
• Magnetic force is more at poles
• A magnet has a magnetic field around it
• Like poles repel 
• Unlike poles attract

♦ What is the difference between Permanent Magnet and Temporary Magnet?
• When magnetic materials are placed in a magnetic field, they acquire magnetic properties. When the magnetic field is removed, they lose their magnetic power. Such magnetic materials are called Temporary Magnets.
• The magnetic property of the natural magnet, Lodestone and various other magnets persists for a long time. Such magnets are called permanent magnets. 
♦ Write an experiment to test the strength of magnets. 
• Materials required: Bottle, sand, two pieces of half-inch PVC pipe (50 cm, 15
cm), ½ inch elbow pipe, blade, thread, scale, double-sided tape.

• Procedure: Take sand in the bottle and insert the long PVC pipe into the sand and fix it. Fix the short PVC pipe to the top of the long pipe using the elbow pipe. Place the bottle on the table. Place the scale near the bottle as shown in the figure. Stick the scale with the double-sided tape to prevent it from moving. Suspend a blade from the short PVC pipe as shown. Slowly bring a magnet from the far end of the scale towards the blade. When attraction is felt on the blade, note the position of the magnet with the help of the scale. Repeat the experiment using different magnets.

• Record the observations in the table.
• Inference: The magnet which attracts the blade from the longer distance has more magnetic force. Magnets vary in their magnetic force.

♦ Find the situations in which the magnetic force of magnets decreased.
• When thrown 
• When dumped together.
• When hit hard with a hammer 
• When heated

♦ How are bar magnets stored?
Bar magnets are stored in pairs. Unlike poles should be on the same side. A non-magnetic substance should be placed between two bar magnets. A stopper (magnetic substance) should be placed at the ends.
♦ How is a U-magnet stored? 
A stopper (magnetic substance) should be placed at the poles of a U-magnet.

♦ How can we make a magnet using electricity?
• Materials required: 
9V battery, connector
Insulated copper wire 
Soft iron nail
Pins
• Construction: Wind the insulated copper wire around an iron nail as shown in the figure. Make sure to have many coils. Remove the insulation from both ends of the copper wire. Connect these ends to the battery using a connector. Bring the tip of the nail close to a few pins. The pins are attracted to the nail. Here, the nail functions as a magnet when electricity is passed through the windings. If the battery is disconnected, the nail cannot attract the pins. When the electricity is cut off, the nail loses its magnetic power.

♦ What is an electromagnet?
When electricity passes through a copper wire, a magnetic field is created around it, and the nail becomes a magnet. This is an electromagnet. Its magnetic power is temporary. When the electric current is cut off, the electromagnet loses its magnetic power.

♦ What are the daily life situations where magnets are used?

1. Magnetic screwdriver
2. Electric bell
3. Pin holder 
4. Magnetic crane
5. Magnetic Building Sticks Blocks
6. Electric motor
7. Loudspeaker
8. Magnetic door stopper
Let’s Assess

1. Which of the following is a magnetic substance?
a) Paper  
b) Iron nail   
c) Wood  
d) Copper wire
Answer: 
b) Iron nail   

2. Find the correct statements.
a) A disc magnet has one pole.
b) Like poles of magnets attract.
c) The magnetic power is low at the middle part of a bar magnet.
d) Rubber is a non-magnetic substance.
Answer: 
c) The magnetic power is low at the middle part of a bar magnet.
d) Rubber is a non-magnetic substance.

3. During carpentry work at home, some iron nails have fallen into the sawdust. Can you suggest an easy method to separate these nails?
Iron nails can be collected using a magnet

4. The mark indicating the pole of a magnet is missing. Suggest some methods to find out the poles?
1. Using Another Magnet
• Take a magnet whose poles are marked.
• Bring one end of the marked magnet close to the unmarked one.
• Like poles repel, unlike poles attract. If the marked north pole repels the end of the unmarked magnet, that end is north, and the other end is south.

2. 
• Hang the magnet freely by using a thread. A freely suspended magnet always points in the North-South direction.
• The end pointing north is usually the north pole of the magnet, and the other end is south pole.


5. Observe the figures. In which situations do attraction occur? In which situations do repulsion occur?
• Situations in which attraction occurs: a, c, d, f
• Situations in which repulsion occurs: b, e

6. The key of a vehicle has fallen into the crack of a slab on the road. It can’t be taken out with hands. You can see the key through the crack of the slabs. Can you suggest a method to get the key without removing the slab?
The key can be taken through the crack of the slabs by using a magnet tied to a thread. 



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