If the filament of the bulb is broken, the circuit will not be complete. (c)-(iv) The hammer strikes the gong every time the circuit is completed. After half an iron of ironing, the light went off and Pinki went outside to the lobby of her house to check it there was any problem in the household circuit. When an electric current flows through a wire, it behaves like a magnet. Electric Current and Its Effects Class 7 Extra Questions and Answers Science Chapter 14 PDF are solved by experts and will guide students in the right direction. When the current flows through any wire, a magnetic field is developed around that wire or coil and it behaves like magnet. (a) All are correct (i) The basic unit of time is second. If current is passed through a coil, does the pins cling to the coil? The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis. 6. Answer: (c) double Answer: When an electric current flows through a copper wire AB s shown in figure, the wire [NCERT Exemplar] Question 9. Nutrition in Plants. (b) No, the amount of heat produced in the wire of same length but different thickness cannot be same because amount of heat produced in a wire also depends on the thickness of the wire. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.. For a better understanding of this chapter… If the current crosses that limit, the fuse wire melts due to heating effect of current and breaks the circuit. (a) On which effect of electric current, does the electric iron works? Short circuiting is a name given to a situation in which the live and the neutral wires accidently come in contact. (a) Copper and aluminium wires are usually employed for electricity transmission. Thus, the clapper strikes the gong rapidly producing almost continuous sound. Question 5. If cells are placed side by side. The element of an electric iron is made of tungsten. Question 1. CBSE Class 7th Science solutions provide ample material to enable students to form a good base with the fundamentals of the NCERT Class 7 Science textbook. Question 1. (i) The blood from the heart is transported to all parts of the body by the . (d) None of the above … Explain. However, when the electromagnet pulls the iron strip, it breaks the circuit. Explain why. Answer: NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Multiple Choice Questions Question 6. Answer: (c) There is a minimum limit on the current which can safely flow in the electric circuits 2. A battery is a combination of NCERT Solutions 2020-21 are based on latest NCERT Books for the academic session 2020–2021. What is a filament? (a) deflects a magnetic needle placed near it, Question 5. 5. iron. 3. Extra Questions for Class 7 Science Chapter 14 Electric Current and Its Effects with Answers. State one measure to avoid overloading in an electrical circuit. It no longer attracts the iron strip. Which of the following are not correct? Answer: Check the below NCERT MCQ Questions for Class 7 Science Chapter 16 Water: A Precious Resource with Answers Pdf free download. Mention the name of the two devices that work on the basis of magnetic effects of current. 5. [NCERT Exemplar; HOTS] If the number of turns in the coil of an electromagnet is more, the strength of the electromagnet will be (a) Heating effect of current is used in electric heater and geyser. 1. (b) (ii) and (iii) are correct, Question 7. INCERT Exemplar] 4. It contains chapter-wise answers to all the questions so that students of Class 7 can prepare well for exams. A car battery is just one big cell. ISI mark is a mark for which we should look at an electrical appliance before buying. Answer: NCERT Solutions for Class 7 Science Chapter 14 - Electric Current and its Effects. False, since CFLs consume less electricity than electric bulb. In the process, the hammer at the end of the strip strikes the gong of the bell to produce a sound. NCERT Solutions Class 7 Science Chapter 14 Electric Current and its Effects September 25, 2019 by Sastry CBSE Topics and Sub Topics in Class 7 Science Chapter 14 Electric Current and its Effects: 4. Question 3. Answer: Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a … Electric fuse is based on the magnetic effect of electric current. Doctors use tiny electromagnets to take out small pieces of magnetic material that have accidentally fallen in the eye. If unconsciously, a child puts his finger in the electric socket, the shock may be fatal. Mention the name of the two devices that work on the basis of magnetic effects of current. Answer: Question 5. (c) MCB, Question 3. Question 9. (b) State the values here showed by Pulkit’s father. The coil of wire contained in heater is known as When a short circuit takes place or when overloading takes place, then the current becomes large and heats the fuse wire too much and thus, it gets melted and circuit breaks which prevents the damage of the wiring and electrical appliances. Many toys also have electromagnets inside them. Answer: Answer: Answer: So, as the armature moves towards the poles of the electromagnet, the clapper attached to it strikes the gong and produces a ringing sound. Then anyhow, he managed to get his mobile in his hand and with the help of its light, he went outside of his room to check if there was any problem in the electric circuit board of his house. Answer: (a) circuit CFLs consume more electricity than an ordinary bulb. 3. NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants in English Medium and अध्याय 12 पादप में जनन in हिंदी मीडियम free PDF file download or view online updated for academic session 2020-21 based on new NCERT Books. Question from very important topics are covered by NCERT Exemplar Class 7.. You also get idea about the type of questions and method to answer in your Class 7th … Paheli does not have a night lamp in her room. (d) We should never turn the switch in ON position, Question 6. Answer: Give the name any two electrical appliances in which electromagnets are used. Does the electric current have other effect except heating? A combination of two or more cells is called a ……………… . (c) gives electric shock All our solutions for CBSE Class 7 are prepared in accordance with the latest CBSE syllabus, and they are amended from time to time. Question 1. When the current through the coil stops flowing, the coil does not remain an electromagnet. Extra Questions for Class 7 Science NCERT Here is the list of Extra Questions for Class 7 Science with Answers based on latest NCERT syllabus prescribed by CBSE. No current flows through any part of the circuit. Question 4. Answer: Question 1. When the switch is in the ‘ON’ position, the circuit from the positive terminal of the battery to the negative terminal is complete. As we know that a battery is a combination of two or more cells and it can be constructed by placing cells property on cell holder in such a way that the positive terminal of one cell is connected to the negative terminal of other. (a) Fuses are inserted in electric circuits of all buildings That is why the electromagnets are better than the permanent magnets. 7. Free Chapter wise NCERT Solutions for Class 7 by Extramarks allow students to understand a tough topic with an easier explanation. Boojho made an electromagnet by winding 50 turns of wire over an iron screw. (a)-(ii) Question 1. No, we cannot use same fuse in a geyser and in a television set because the fuse used in every appliances has some limit to withstand the current flows through it. Electric Current and Its Effects Class 7 Extra Questions and Answers Science Chapter 14 PDF are solved by experts and will guide students in the right direction. Paheli took a wire of length 10 cm. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. (a) When live and neutral wire touches each other directly then it leads to short circuit in which the large amount of current flows through the household wiring and this large current may heat the wires to a dangerously high temperature and a fire may be started. NCERT Solutions for Class 7 Science in PDF file format free to download. Answer: Who discovered magnetic effect of electric current? In the bulb there is a thin wire, called the filament, which glows when an electric current passes through it. [NCERT Exemplar] 1. Every fuse is designed to carry current up to a certain maximum limit. Videos explanation of complete chapter 1 of Class 7 science is given in Hindi Medium and English Medium to revise the entire chapter in one hour. Reproduction in Plants Class 7 Extra Questions and Answers Science Chapter 12 PDF are solved by experts and will guide students in the right direction. (b) magnetic effect of current is used. 3. safety device It is said to be open. Which of the following precautions need not be taken while using electric gadgets/ appliances/circuit? Answer: Question 14. Construction: It consists of a coil of wire wound on an iron piece. This is how the bell rings. 2. Answer: Circuit breaker device which can be used in place of fuse in domestic electric wiring is called Answer: Electric fuse is required in all electrical appliances to prevent damage from excessive current flow and during short circuit. MCQ Questions for Class 7 Science with Answers are prepared as per the Latest Exam Pattern. Electric Current and Its Effects Class 7 MCQs Questions with Answers. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis. Answer: NCERT Solutions for Class 7 Science – Get all NCERT solution for class 7 science chapter wise from this page. State the property of a conducting wire is utilised in making electric fuse. Question 4. The circuit is then said to be closed and the current flows throughout the circuit instantly. Free PDF download of Important Questions for CBSE Class 7 Science prepared by expert teachers from the latest edition of CBSE (NCERT) books. NCERT Grade 7 Science, Chapter 14, Electric Current and its Effects are covered under five different sections dealing with the concepts such as symbols of electric components, the heating effect of electric current and magnetic effect of electric current. Then why it is called a battery? Question 1. Answer: Difference between an open circuit and a closed circuit. The device used in these days in place of electric fuse is MCB (Miniature Circuit Breaker). In an electric circuit, a fuse is a ………………, ……………… to prevent possible fire. The bulb glows only when the circuit is closed. Fibre to Fabric Class 7 Extra Questions and Answers Science Chapter 3 PDF are solved by experts and will guide students in the right direction. Comment. (i) One reason for excessive currents in electrical circuits is the direct touching of wires. When the switeh is in the ‘OFF’ position, the circuit is incomplete. Which terminal of a cell is represented by longer line? Will the coil remain an electromagnet? Question 3. Chapter 1 Nutrition in Plants. When electric current is passed through a coil, there is a magnetic field developed around the coil or wire, if magnetic compass is placed near by, it deflects the magnetic needle. We should not touch the lighted bulb. This completes the circuit. (c) two or more cells, Question 9. The three effects of electricity are. Distinguish between an open circuit and a closed circuit. 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If cells are placed side by side, then with the help of some connecting wires, the positive terminal of one cell is connected to the negative terminal of other to produce a combined power of all cells which can be called a battery. As, Paheli’s coil has more number of turns than Boojho. The key or switch can be placed anywhere in the circuit. In this page, we are providing Electric Current and Its Effects Class 7 Extra Questions and Answers Science Chapter 14 pdf download. (e)-(v) Answer: Question 7. Solving the Motion and Time Multiple Choice Questions of Class 7 Science Chapter 13 MCQ can be of extreme help as you will be aware of all the concepts. When the armature moves towards the magnet, its contact with the contact screw is broken. [NCERT Exemplar] magnetic effect of current. (c) MCB (b) Will the heat produced be the same, if the wires taken by them are of equal lengths but of different thickness? For more info feel free to reach us and we will guide you at the earliest possibility. Question 10. The electromagnet loses its magnetism for a moment and the armature is no longer attracted by it. 8. We should not touch a lighted electric bulb connected to the mains because it may be very hot and our hand may get burnt badly. MCQ Questions for Class 7 Science with Answers were prepared based on the latest exam pattern. If we connect more cells in the circuit, then what will happen? Question 5. In order to ring the bell first of all we press the push button switch in order to ring the bell. (a) Brass In trucks, tractors and inverters, cells are internally arranged and we need not to connect it externally, so we called it as batteries. Electromagnets are used in electric bells. As if high amount of current is passed, it melts to disconnect the electric circuit and prevent us from causing any damage. Due to this, the electric circuit breaks and no current flows in the electromagnet coil. Answer: One day, Pinki was ironing the clothes in her room. It implies that the bell rings. Answers An open electric circuit is or electric path which begins from the positive terminal of a battery or cell, gets broken at some point. [NCERT Exemplar; HOTS] Write construction and working of an electric bell. Because due to excessive heat of bulb, the towel may burn and it also results in the wastage of electrical energy. True Discuss the reason for excessive currents in electrical circuits. Nutrition in Plants Important … Overloading can be avoided if too many appliances are not connected to a single socket. Name it. (a) lesser An electromagnet can be switched OFF or switched ON as desired and this is not possible in the permanent magnets. Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery. 6. A fuse is used to save energy in the electric circuits. Electric Current and Its Effects Class 7 Extra Questions Science Chapter 14 Electric Current and Its Effects Class 7 Science Extra Questions Very Short Answer Type Questions. [NCERT Exemplar; HOTS] The lighted bulb connected to main supply should not be touched by our hand directly, as a lighted bulb can be very hot and can burn our hand as well. The cell is the unit of battery when more than one cell are combined together, it forms a battery. By practising given Class 7 Chapterwise Important Questions with solutions will help in scoring more marks in your Examinations. (a) Explain, what happens when live wire and neutral wire touches each other directly? (b) The values showed by Pinki here is a great concern and love towards her own 4 years old daughter. The key or switch can be placed anywhere in the circuit. Answer: Question 3. NCERT solutions for Class 7 Science have been provided below to aid the students with answering the questions correctly, using a logical approach and methodology. Register online for Science tuition on Vedantu.com to score more marks in your examination. Answers: Positive. Answer: [NCERT Exemplar; HOTS] Question 4. Students can utilize these solutions for adapting to and solving complex problems and completely understand the concepts explained by different topics. The nails attract the pins. (d) BCM Compact fluorescent lamps are preferred over electric bulbs because electric bulbs use more power of electricity and it also losses electrical energy in the form of heat but it is not so in compact fluorescent lamps. (ii) Another reason for excessive current can be the connection of many devices to a single socket. (c) spring (a) We should never touch a lighted electric bulb connected to the mains Answer: (b) There is a maximum limit on the current which can safely flow through the electric circuits (b) There is always an increase in the length of the wire with the increase in its resistance. Question 16. (c) Since tungsten has high melting point and high resistance. The current flows in the coil and the hammer strikes the gong again. Name some electric appliances where the heating effect of the electric current is used. Why is an electric fuse required in all electrical appliance? False, a car battery is a combination of cells. Question 11. 3. What are complete and incomplete circuits? Answers: Answer: Answer: (c) We should never use just any wire or strip of metal in place of a fuse The iron strip comes back to its original position and touches the contact screw again. Answer: If the current flows through wire, does the wire behave like a magnet? When a switch is in OFF position, [NCERT Exemplar] Question 2. True/False NCERT Books Class 7 Science: The National Council of Educational Research and Training (NCERT) publishes Science textbooks for Class 7.The NCERT Class 7th Science textbooks are well known for it’s updated and thoroughly revised syllabus. Answer: Since the magnetic effect directly depends on the number of turns of the coil. Name the type of mark for which we should look at an electrical appliance before buying, [HOTS] Give reason. So, the bulb will not glow. The NCERT Science Books are based on the latest exam pattern and CBSE syllabus. No, the bulb does not glow when the circuit is opened. Answer: This may happen if the insulation on the wires has come off due to wear and tear. Answer: The electromagnets are also used to separate magnetic material from the junk. The positive terminal is represented by longer vertical line while negative terminal is represented by shorter vertical line. [Value Based Question] All the solutions of Respiration in Organisms - Science explained in detail by … 1. Answer: (a) DCB Question 2. It gets attracted by the coil or we can say that pins cling to the coil. Miniature Circuit Breaker. Answer: Answer: Name two electric devices for each where State whether the bulb glows when the circuit is opened. (a) A magnetic device used for finding geographic directions, (b) A device which is essential in an electric bell, (c) A fuse used in expensive and sensitive electric devices, (d) An alloy used as a material of fuse wir, (e) A material used for making filament of a bulb, (f) A material which does not allow the electric current to pass, (g)A material used for making electromagnets. Last Sunday, Pulpit was playing videotape in his room. Answer: (iii) no current flows through it Give one reason to justify your answer. Free PDF download of Important Questions with solutions for CBSE Class 7 Science Chapter 15 - Light prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Question 8. This process is repeated in quick succession. Choose the statement which is not correct in the case of an electric fuse. (d) element, Fill in the Blanks (d)-(iii) The electromagnet attracts the iron armature once again and the clapper strikes the gong again producing a ringing sound. Answer: When an electric current is passed through a coil, it gets magnetised due to phenomena of magnetic effect of current. Stay connected to our site to avail latest updates on Extra Questions for Various Classes instantly. (b) component NCERT Solutions for Science Class 7 have been created and compiled by some of the experts and professional teachers in the field making them a highly credible source for Class 7 Science. Answer: Answer: Question 13. If we connect more of cells in the circuit, then the nail will attract more pins. An electric cell produces electricity from the ……………… in it. You can refer to NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. (b) We should never do experiment with the electric supply from the mains or a generator or an inverter A closed circuit is an electric path which begins from the positive terminal of a cell or battery and terminates at its negative terminal without any break. These MCQ Questions on Motion and Time Class 7 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Also mention the name given to a situation in which the live and the neutral wires accidently come in contact. The current flowing in both the circuits is the same. Choose the combination of correct answer from the following. 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Material from the gong night to get dim light is no longer attracted by it electric! 50 turns of the bulb is broken, would the circuit to reach us and will! Device 4. battery 5. iron at one end is kept close to the electromagnet coil strengthen your and! Time the circuit be complete bulb does not have a night lamp in room. And high resistance well for exams in these days in place of electric.! With cellotape or a plastic cover when not in use the decisions and he showed a very concern!