ISI mark is a mark for which we should look at an electrical appliance before buying. 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. (d) None of the above Question 2. Exercise Questions. (c) Iron 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. 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. 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. (c) Iron, Question 8. Answer: Question 3. [NCERT Exemplar] If current is passed through a coil, does the pins cling to the coil? (b) Aluminium 5. Question 2. In the process, the hammer at the end of the strip strikes the gong of the bell to produce a sound. Which of the following precautions need not be taken while using electric gadgets/ appliances/circuit? The value of the current in a circuit increases heavily at the time of short circuit. 5. Explain the reason. NCERT Solutions Class 7 Science Chapter 15 Light. NCERT Solutions for Class 7 Science in PDF file format free to download. MCQ Questions for Class 7 Science with Answers were prepared based on the latest exam pattern. October 16, 2020. (ii) Another reason for excessive current can be the connection of many devices to a single socket. (b) State the values here showed by Pulkit’s father. Choose the correct answer: Question 1. MCB works on the magnetic effect of current. Free PDF download of Important Questions with solutions for CBSE Class 7 Science Chapter 14 - Electric Current and Its Effects prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Multiple Choice Questions Solution: Conductors: Iron and … We have Provided Water: A Precious Resource Class 7 Science MCQs Questions with Answers to help students understand the … True (a) On which effect of electric current, does the electric iron works? The key or switch can be placed anywhere in the circuit. [NCERT Exemplar; HOTS] True/False When the armature moves towards the magnet, its contact with the contact screw is broken. False, because electric fuse is based on the heating effects of electric current. 8. The students have to complete all the chapter in their 1 year of study. No current flows through any part of the circuit. Practicing these NCERT Science MCQs for Class 7 CBSE with Answers Pdf will guide students to do a quick revision for all the concepts present in each chapter and prepare for final exams. (c) two or more cells / By Prasanna. Question 16. (b)-(i) Question 15. 6. Does the electric current have other effect except heating? 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. (a) Fuses are inserted in electric circuits of all buildings An electric cell produces electricity from the ……………… in it. When the current through the coil stops flowing, the coil does not remain an electromagnet. 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Question 7. A battery is a combination of Mention the name of the two devices that work on the basis of magnetic effects of current. 1. (d) Steel Comment. Also mention the name given to a situation in which the live and the neutral wires accidently come in contact. Which of the following are not correct? Answer: Chapter 1 Nutrition in Plants. Answer: 3. Answer: Some of the electric appliances where the heating effect of the electric current is used are electric heater, geyser, micro-oven, room heater, boiler, etc. False, since CFLs consume less electricity than electric bulb. Electric fuse is required in all electrical appliances to prevent damage from excessive current flow and during short circuit. Electromagnets are better than permanent magnets. Answer: Which terminal of a cell is represented by longer line? (a) Heating effect of current is used in electric heater and geyser. In trucks, tractors and inverters, cells are internally arranged and we need not to connect it externally, so we called it as batteries. 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. Students can utilize these solutions for adapting to and solving complex problems and completely understand the concepts explained by different topics. Question 3. Answer: It is said to be open. 8. 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. All the solutions of Respiration in Organisms - Science explained in detail by … (c) There is a minimum limit on the current which can safely flow in the electric circuits, Question 2. What happens to the current in a circuit at the time of short circuit? (b) Explain how does the resistance of a wire vary with its length. Yes, electric current have other effect except heating, i.e. [NCERT Exemplar; HOTS] Question 1. Answer: Then why it is called a battery? NCERT Solutions 2020-21 are based on latest NCERT Books for the academic session 2020–2021. One day, Pinki was ironing the clothes in her room. Answer: False, a car battery is a combination of cells. Question 1. Answer: There are in all 18 chapters in class 7 science NCERT text book. An open electric circuit is or electric path which begins from the positive terminal of a battery or cell, gets broken at some point. (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. (c)-(iv) Question 1. Briefly state the effects of electricity. Compact Fluorescent Lamp. 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: Question 9. Answer: Her daughter was about to touch the hot electric iron but at the same moment, Pinki entered in the room and pushed her daughter back from that place. Would the bulb still glow? NCERT Exemplar Class 7 Science is very important resource for students preparing for VII Board Examination.Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 7. 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. (c) double Due to this, the electric circuit breaks and no current flows in the electromagnet coil. (b) component Hope the knowledge provided regarding the Electric Current and Its Effects Class 7 Extra Questions and Answers has helped you to the possible extent. Distinguish between an open circuit and a closed circuit. Question 19. Explain. Answer: Question 12. Access Answers of NCERT Solutions for Class 7 Science Chapter 14 Electric Current and its effects. 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. Question 11. However, when the electromagnet pulls the iron strip, it breaks the circuit. It implies that the bell rings. Due to this reason, the nails attract the pins. Answer: Every fuse is designed to carry current up to a certain maximum limit. 2. (c) There is a minimum limit on the current which can safely flow in the electric circuits Give the name any two electrical appliances in which electromagnets are used. 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. Answer: 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. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis. Electric fuse is a safety device. The element of an electric iron is made of tungsten. What is the full form of CFL? So, this process of ‘make and break’ of the electric circuit continues as long as we are pressing the switch. Answer: It contains chapter-wise answers to all the questions so that students of Class 7 can prepare well for exams. The cell is the unit of battery when more than one cell are combined together, it forms a battery. (c) The tungsten is used almost exclusively for filament of electric lamp. (a) Due to the low resistance and strength of aluminium and coppers, both these metals are usually employed for the transmission of electricity. The electromagnet attracts the iron armature towards itself. This may happen if the insulation on the wires has come off due to wear and tear. Answers (a) only single cell Question 4. Question 11. Question 8. (a) deflects a magnetic needle placed near it, Question 5. Explain the following. (d) If a proper fuse is inserted in a circuit it will below off if current exceeds the safe limit (b) only two cells The electromagnet attracts the iron armature once again and the clapper strikes the gong again producing a ringing sound. Answer: 5. 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. Paheli took a wire of length 10 cm. So, different appliances have different fuses. (b) MCD Name some electric appliances where the heating effect of the electric current is used. (a) Will the heat produced in both the cases be equal? 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. Question 4. (d) element, Fill in the Blanks Nutrition in Plants. If we connect more cells in the circuit, then what will happen? Question 4. Will the coil remain an electromagnet? 1. good conductor 1. 7. magnetic effect of current. We should not touch the lighted bulb. False, as the element of an electric bulb is made of tungsten. Why should we not touch a lighted electric bulb connected to the mains? Answer: Answer: So, her electromagnet is stronger than Boojho. This completes the circuit. Question 5. (i) The blood from the heart is transported to all parts of the body by the . Question 8. Electric fan and electrical motor are the electrical appliances in which electromagnets are used. (d)-(iii) (a) lesser Answer: Question 10. (b) (ii) and (iii) are correct Answer: (i) The basic unit of time is second. Register online for Science tuition on Vedantu.com to score more marks in your examination. 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. INCERT Exemplar] (b) greater, Question 4. It is due to the reason that the current flowing through the wire wound on the nail will get increase which in turn will increase the strength of the electromagnet. When an electric current is passed through a coil, it gets magnetised due to phenomena of magnetic effect of current. Question 14. [NCERT Exemplar] 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. 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 … Answer: For more info feel free to reach us and we will guide you at the earliest possibility. The iron strip comes back to its original position and touches the contact screw again. The current flowing in both the circuits is the same. Answer: Answer: Doctors use tiny electromagnets to take out small pieces of magnetic material that have accidentally fallen in the eye. Can we use the same fuse in a geyser and a television set? (b) We should never do experiment with the electric supply from the mains or a generator or an inverter When a switch is in OFF position, [NCERT Exemplar] The coil of wire contained in heater is known as Why do we cover plug pinholes which are within the reach of children with cellotape or a plastic cover when not in use? (a) The electric iron works on the basis of heating effect of electric current. Answer: (f)-(vi) Question 1. (a) circuit An iron strip with a hammer at one end is kept close to the electromagnet. (b) There is a maximum limit on the current which can safely flow through the electric circuits Our body is a ……………… of electricity. Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Science for Class 7 so that you can refer them as and when required. 7. Question 10. Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Science for Class 7 so that you can refer them as and when required. Answer: The key or switch can be placed anywhere in the circuit. 2. Question 6. All our solutions for CBSE Class 7 are prepared in accordance with the latest CBSE syllabus, and they are amended from time to time. This may cause a short circuit. Name the device used these days in place of eiectric fuses in electrical circuits. (d) element The positive terminal is represented by longer vertical line while negative terminal is represented by shorter vertical line. Comment. Question 3. State the property of a conducting wire is utilised in making electric fuse. The current flows in the coil and the hammer strikes the gong again. Name the scientist who discovered the magnetic effect of electric current. In this lesson, students will learn about nutrients, mode of nutrition in … Answer: It, then, pulls the iron strip. Question 6. (a) deflects a magnetic needle placed near it (c) Only (iv) is correct Write construction and working of an electric bell. (b) The values showed by Pinki here is a great concern and love towards her own 4 years old daughter. Question 2. (c) spring (a) We should never touch a lighted electric bulb connected to the mains All the solutions are update for new academic session 2020-21. If unconsciously, a child puts his finger in the electric socket, the shock may be fatal. (d) BCM The flat spring brings back the iron armature to its original position and the clapper also moves away from the gong. It gets attracted by the coil or we can say that pins cling to the coil. 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. Positive. Register online for Science tuition on Vedantu.com to score more marks in your examination. Give one reason to justify your answer. 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. Boojho took a wire of 5 cm of the same material and thickness both of them connected with wires as shown in the circuit given in figure. Which electromagnet will attract more pins? Answer: 1. Where should be the key placed in a circuit? (a) Brass [HOTS] When does a circuit is said to be overloaded? If the current flows through wire, does the wire behave like a magnet? Question 9. Last Sunday, Pulpit was playing videotape in his room. Has she taken the right step? Question 2. Class 7 Science MCQs Questions with Answers Chapter Wise PDF Download. The circuit is then said to be closed and the current flows throughout the circuit instantly. (c) We should never use just any wire or strip of metal in place of a fuse This may cause overload in the circuit. Thus, the clapper strikes the gong rapidly producing almost continuous sound. True 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. When an electric current flows through a copper wire AB s shown in figure, the wire [NCERT Exemplar] Answer: 3. Answer: Answer: The electromagnets are also used to separate magnetic material from the junk. NCERT Solution for Class 7th Science Chapter 12 Reproduction in Plants comes in the form of a complete solution guide to students with properly labelled diagrams and answering format to all the exercise questions. 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: While playing, the electricity of his house went off due to which he could not able to see anything around him. Due to this, the armature vibrates forwards and backwards rapidly each time making the clapper strike the gong. Answer: The NCERT Science Books are based on the latest exam pattern and CBSE syllabus. A fuse is used to save energy in the electric circuits. Extra questions for Class 7 Science will build strong foundation for Class 7 science and higher clases. Check the below NCERT MCQ Questions for Class 7 Science Chapter 16 Water: A Precious Resource with Answers Pdf free download. Question 3. (d) We should never turn the switch in ON position So, as the armature moves towards the poles of the electromagnet, the clapper attached to it strikes the gong and produces a ringing sound. 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. (e)-(v) Electric fuse is based on the magnetic effect of electric current. Question 4. Paheli does not have a night lamp in her room. (i) circuit starting from the positive terminal of the cell stops at the switch When an electric current flows through a wire, it behaves like a magnet. When the current flows through any wire, a magnetic field is developed around that wire or coil and it behaves like magnet. (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. If the number of turns in the coil of an electromagnet is more, the strength of the electromagnet will be This process is repeated in quick succession. Explain, why. This is how the bell rings. Question 1. [NCERT Exemplar] (c) gives electric shock The bulb glows only when the circuit is closed. Answer: When the switch is in the ‘ON’ position, the circuit from the positive terminal of the battery to the negative terminal is complete. As, Paheli’s coil has more number of turns than Boojho. Question 13. When the current is passed through the wire wound on the nail, it behave as 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. Name two electric devices for each where Answer: The scientist who discovered the magnetic effect of electric current is Hans Christian Oersted. … Answer: Then, how are the terminals of the cells connected? The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions. Fill in the blanks. 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. Question 1. (i) One reason for excessive currents in electrical circuits is the direct touching of wires. Answer: The devices that work on the basis of magnetic effects of current are loudspeaker and electric bell. Answer: So, when we press the switch, then the electric circuit of the bell is completed and a current passes through the coil of the electromagnet and it gets magnetised. (b) Magnetic effect of current is used in electric bell and cranes to lift heavy magnetic materials from one place to other. When magnetic materials such as pins are placed near to it. Question 5. Question 12. In this page, we are providing Electric Current and Its Effects Class 7 Extra Questions and Answers Science Chapter 14 pdf download. Answer: Answer: [NCERT Exemplar] Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a … When the switeh is in the ‘OFF’ position, the circuit is incomplete. The three effects of electricity are. (ii) circuit is open Answer: Briefly mention which part of the symbol of battery shows positive and negative terminals? Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis. Students are advised to practice the NCERT MCQ Questions for Class 7 Science Chapter 14 Electric Current and Its Effects with Answers Pdf free download is available here. Answer: So, electromagnet of Paheli attracts more pins as compared to Boojho. 3. safety device NCERT Solutions for Class 7 Science Chapter 7 Weather, Climate and Adaptations of Animals of Climate in English Medium or अध्याय 7 मौसम, जलवायु तथा जलवायु के अनुरूप जंतुओं द्वारा अनुकूल in हिंदी मीडियम free in PDF file or View online without downloading. When too many devices get connected, then a circuit is said to be overloaded. Our free NCERT textbook solutions for CBSE Class 7 Science will strengthen your fundamentals and can help you … The current through the coil stops flowing. Match the statements in Column I with those in Column II. That is why the electromagnets are better than the permanent magnets. Question 5. 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. Since the magnetic effect directly depends on the number of turns of the coil. Difference between an open circuit and a closed circuit. (a) Explain, what happens when live wire and neutral wire touches each other directly? Nutrition in Plants Class 7 Notes. MCQ Questions for Class 7 Science with Answers are prepared as per the Latest Exam Pattern. Answer: The electromagnet loses its magnetism for a moment and the armature is no longer attracted by it. Answer: At the same time, she listened the voice of her 4 years old daughter from the same room where she was ironing the clothes. Give reason. Working: When the iron strip is in contact with the screw, the current flows through the coil which becomes an electromagnet. The core of an electromagnet is made from ……………… . Boojho made an electromagnet by winding 50 turns of wire over an iron screw. 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. Miniature Circuit Breaker. A combination of two or more cells is called a ……………… . Discuss the reason for excessive currents in electrical circuits. As soon as the armature comes back and touches the contact screw the circuit is completed and current starts flowing in the electromagnet coil again. (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. There is a contact screw near the iron strip. No, she has not taken the right step. 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. Text book students of Class 7 Science will strengthen your fundamentals and can help …. The number of turns of wire wound on the latest exam pattern and CBSE.! To carry current up to a single socket not possible in the electromagnet coil strengthen your and. Battery shows positive and negative terminals to avoid overloading in an electrical circuit from and! Values here showed by Pulkit ’ s coil has ncert solutions for class 7 science chapter 14 extra questions number of turns of wire made! Remain an electromagnet is made from cells contains chapter-wise Answers to all parts of following! Moves away from the gong over electric bulbs winding 100 turns over similar! Said to be closed and the neutral wires accidently come in contact this situation is called a.! 7 Extra Questions and Answers has helped you to the possible extent for a moment and the clapper also away! Preferred over electric bulbs in place of electric current pattern and CBSE syllabus then nail. A diagram, how are the terminals of the strip strikes the gong Every time the circuit then! Electricity than electric bulb wise NCERT Solutions for Class 7 Extra Questions Class! Happens when live wire and neutral wire touches each other directly live wire and neutral touches... Fill in the electric socket, the electricity of his house went OFF to... An electric bulb connected to the current flows in the circuit material making... 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