TS 6th Class Science 12th Lesson Questions and Answers Telangana – Simple Electric Circuits

TS Board 6th Class Science Guide Telangana 12th Lesson Simple Electric Circuits Textbook Questions and Answers.

Simple Electric Circuits – TS 6th Class Science 12th Lesson Questions and Answers Telangana

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Question 1.
What is an electric circuit ? Explain with a diagram. (Communication through diagram and Model Making) 8 M
Answer:

1. Figure shows a closed circuit. It consists of a cell, a bulb and connecting wires.
2. An electric circuit provides a complete path for electricity to flow between the cell and the bulb.
3. A similar circuit exists for an electric bulb which we use in our houses.
4. The two electric supply wires are connected to the two terminals of the bulb through a switch.
5. When the switch is closed the circuit provides complete path for electricity.

Question 2.
What are the parts of a torch-light ? (Conceptual Understanding) 4M
Answer:
The parts of a torch-light are

1. A hollow cylindrical barrel (or plastic casing)
2. Electric cells
3. Bulb
4. Side switch
5. Glass cover (a circular glass plate)
6. Reflector
7. Metal spring

Question 3.
In a bulb the part which gives us light is : (Conceptual Understanding) 2M
(a) Metal base
(b) Glass chamber
(c) Filament
(d) Terminals.
Answer:
(c) (Filament)

Question 4.
Classify the following into conductors and insulators : (Conceptual Understanding) 2 M
(a) Water
(b) Plastic pen
(c) Pencil lead
(d) Dry cotton cloth
(e) Wet cotton cloth
(f) Dry wood
(g) Wet wood
Answer:

Conductors	Insulators
Water	Pencil lead
Wet cotton cloth	Plastic pen
Wet wood	Dry cotton cloth
	Dry wood

Question 5.
Niharika observed an electrician repairing a street light wearing gloves on his hand. She asked him some questions. What would be those questions ? (Asking questions and making hypothesis) 4M
Answer:
She might have asked the following questions.

1. You covered your hands with something. What are they ?
2. What is their purpose ?
3. Can’t you work, without wearing them ? Why ?
4. What is the material of those gloves ?
5. Can we have gloves made of other materials ?
6. Can we work with them in summer as well as rainy seasons ? Why ?

Question 6.
In activity 4 we observed some situations where the torch bulb glows. Niharika challenged her friends that she could make the bulb not glow even with the cells kept in proper position. What would she have done? (Experimentation andfield investigation) 4M
Answer:
If the electric circuit is broken somehow, the bulb does not glow.
This can be done in some ways :

1. Use of fused bulb
2. Use of exhausted batteries
3. Sliding switch to OFF position
4. Turning the cap anti-clockwise, to break the contact between the bulb and the cells.

Question 7.
Connect a circuit as shown in the following diagram. (Experimentation andfield investigation / Communication through diagram and Model Making) 8M
a) Does the bulb glow? Why?

Answer:
No. The bulb does not glow.

Reason : For the circuit to complete, the +ve terminal of one battery should be connected to the -ve terminal of the other battery. But here, it is not so. The +ve terminal of one battery is connected to the +ve terminal of the second battery. So the circuit is not completed. Electricity does not flow. So the bulb does not glow.

b) Draw the circuit so that the bulb glows.
Answer:

c) Verify it by connecting cells and bulb as per the circuit drawn.
Answer:
Under teacher’s observation verify the above activitv.

Question 8.
What will happen if the cells in a torch are arranged as shown in the following figure ? Why ? (Experimentation andfield investigation) 8M

Answer:
If the cells in a torch are arranged as shown in the above picture. The bulb does not glow.

Reason : The electric circuit is not complete. The +ve terminal of one battery should be connected to the -ve terminal of the second battery. Then only electricity flows in the circuit.

Question 9.
Draw a circuit diagram showing a cell, switch and a bulb.
(or)
Draw a diagram of a simple circuit with the material given. (Dry cell, electric wires, rubber band, bulb, switch) (Communication through diagram and Model Making) 8M
Answer:

Question 10.
A circuit is connected with a cell, bulb and a switch, but the bulb is not glowing. Write all possible reasons for this. (Asking questions and making hypothesis) 2M
Answer:

1. The cell used might have been totally discharged.
2. The bulb taken might have been fused.
3. The switch arranged may not be in touch with the wires as expected.
4. There may be a break in the continuity of the wires taken.

Question 11.
You have studied the story of Thomas Alva Edison. Write a note appreciating his efforts in inventing the bulb ? (Appreciation and Aesthetic sense and values) 4M
Answer:

1. Edison was of an inquisitive nature and he learned science by performing experiments himself.
2. This is a message to the generations that ‘learning by doing” is the best way of knowing things.
3. An intelligent scientist like Edison had to work hard for many years before he could make a bulb.
4. This is another example for all the students to work hard continuously to reach their goals.
5. Life would be unimaginable if Edison had not invented electric bulb.
6. Success never comes sudden. It comes only after continuous attempts.

Question 12.
List the daily activities in which we use electricity. (Application to daily life and concern to Biodiversity) 4 M
(Or)
Where do we use electricity for different works in our daily life prepare a list.
Answer:
Daily activities in which we use electricity :

1. To operate pumps that lift water from wells or from ground level to the roof-top tank.
2. To light over houses, roads, offices, markets and factories.
3. To operate electrical appliances like washing machine, radio, TV, air-conditioner, fan, cooker, iron box etc.
4. Electric cells are also used in alarm clocks, wrist watches, transistor radios, toys, cameras and many other devices.

Question 13.
If you put the switch on, a light will glow, a fan will rotate, an iron box heats up etc. All these different functions will be performed by electricity. How do you feel about the comforts given by this great invention to human beings. ? (Appreciation and aesthetic sence and values) 4 M

1. In the modern society, ‘electricity’ has become an essential ‘commodity’.
2. It plays a very important role in shaping the modern society.
3. Life is hard to imagine without ‘electricity’.
4. From the poor to the rich, electricity is a ‘must1 to each.
5. Now we are enjoying the fruits of the latest technological developments.
6. It would not have been possible without the use of ‘electricity1.
7. It made it possible to turn the vast world into a small village.

Question 14.
Write a list of electrical appliances in your house. Classify them as follows. (Conceptual Understanding) 4 M
Answer:

Works with cell as a source	Works with electric current as a source	Works with both cell and electric current as a source
1) Torch light	1) Fan	1) Tape recorder
2) Transistor	2) Washing machine	2) Fan (small size)
3) Wrist watch	3) Electric motor	3) Transistor
4) Toys	4) Cooker	4) Land telephone
5) Wall clock	5) Iron box	5) Laptop
6) Remote of a TV	6) Vacuum cleaner
	7) Mosquito repellent
	8) TV
	9) Refrigerator
	10) Air conditioner
	11) Inverter
	12) Light bulbs
	13) Sewing machine

Question 15.
Connect circuits as shown in the following figure. Write your observation in each each case. (Communication through diagram and Model Making) 4 M

1. +ve poles of the two cells are connected directly to each other. So the circuit is not completed. Current does not flow in it. Hence the bulb does not glow.
2. The +ve pole of one battery is connected to the -ve pole of the other battery. Circuit completes, current flows, bulb glows.
3. Connections are all correct. Current flows. Bulb glows.
4. Connections are all correct. Current flows. Bulb glows. brilliantly

Question 16.
Match the following : (Conceptual Understanding) 2M
Answer:

Column A		Column B
1) Cell	B	(A) Conductor
2) Switch	D	(B) Source of electricity
3) Safety pin	A	(C) Filament
4) Eraser	E	(D) To close or open a circuit
5) Glowing of bulb	C	(E) Insulator

 

TS 6th Class Science 12th Lesson Notes – Simple Electric Circuits

• Electricity is used for many domestic and industrial activities.
• Electricity helps us to continue working at night.
• A torch-light may be used for providing light.
• In a torch-light, cell is the source of electrical energy.
• An electric cell has two terminals, positive(+) and negative(-).
• An electric bulb glows when electric current passes through it.
• If the bulb has fused, it does not glow.
• In a closed circuit, the electric current passes from one terminal of the cell to the other terminal.
• Torch light consists cell, bulb and switch.
• Substances which allow electric current to flow through them are known as conductors.
• Substances which do not allow electric current to flow through them are known as insulators.
• Materials like hair pin, iron nail, metal bangle, safety pin, sewing needle, coin, aluminium foil etc., are conductors of electricity.
• Materials like eraser, plastic scale, piece of paper, piece of glass bangle, paper clip, piece of chalk, cork, wooden block, candle, thermocole are non – conductors of electricity.
• The electric bulb was invented by Thomas Alva Edison.
• Our body is a conductor of electricity.
• Electricity : It is a form of energy.
• Cell : A source of electrical energy is called a cell.
• Bulb : Bulb consists a filament, two terminals which gives light.
• Fused bulb : If a filament in a bulb doesn’t glow, the bulb is called fused bulb.
• Terminals : A terminal is one of the points where electricity: enters or leaves it.
• Filament : The part of the bulb that glows is called a filament.
• Switch : A switch helps us to allow or break the flow of electricity in a circuit.
• Circuit : A circuit is a complete path which an electric current can flow around.
• Conductor : Substance which allows the flow of electricity through it is cafli’d conductor. Eg : Hair pin, iron nail.
• Insulator : Substance which does not allow the flow of electricity through it is called insulator. Eg: Eraser, plastic scale, wood.
• Tungsten : It is a greyish white metal, which is used in bulb as filament.