When an electric current flows through a wire, it behaves like a magnet. 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. Then, how are the terminals of the cells connected? What are complete and incomplete circuits? Answer: False, a car battery is a combination of cells. Will the coil remain an electromagnet? Explain the reason. (c) There is a minimum limit on the current which can safely flow in the electric circuits (c) Iron Ans. Solution: 2. Choose the combination of correct answer from the following. Answer: (b) Mention the values showed by Pinki here. 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. 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. Answer: The current flows in the coil and the hammer strikes the gong again. While playing, the electricity of his house went off due to which he could not able to see anything around him. (d) BCM It is overloaded by connecting too many devices to it. 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. (c) Only (iv) is correct The coil acts as an electromagnet. (b) There is a maximum limit on the current which can safely flow through the electric circuits True Answer: Stay connected to our site to avail latest updates on Extra Questions for Various Classes instantly. Question 13. All the solutions of Respiration in Organisms - Science explained in detail by … Answer: In trucks, tractors and inverters, cells are internally arranged and we need not to connect it externally, so we called it as batteries. Name it. Why do we cover plug pinholes which are within the reach of children with cellotape or a plastic cover when not in use? MCB works on the magnetic effect of current. When a switch is in OFF position, [NCERT Exemplar] 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. 4. battery 4. It no longer attracts the iron strip. Question 1. So, that is why, the tungsten is used exclusively for filament of electric lamp. Thus, the clapper strikes the gong rapidly producing almost continuous sound. Distinguish between an open circuit and a closed circuit. It gets attracted by the coil or we can say that pins cling to the coil. (b) (ii) and (iii) are correct, Question 7. 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. Discuss the reason for excessive currents in electrical circuits. Question 2. The scientist who discovered the magnetic effect of electric current is Hans Christian Oersted. The device used in these days in place of electric fuse is MCB (Miniature Circuit Breaker). Question 11. [Value Based Question] Answer: Question 5. CFLs consume more electricity than an ordinary bulb. (b) (ii) and (iii) are correct 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. If the filament of the bulb is broken, the circuit will not be complete. (b) Pulkit’s father seems very sensible in taking the decisions and he showed a very great concern towards his son. We should not touch the lighted bulb. 7. Electric fan and electrical motor are the electrical appliances in which electromagnets are used. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. Question 6. 5. iron. When the armature moves towards the magnet, its contact with the contact screw is broken. (c) two or more cells, Question 9. Electric fuse is a safety device. Answer: 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. Answer: Question 5. Answer: (a) All are correct Answer: At the same time, his father suggested him to maintain the distance from the circuit board and decided to call some electrician to check the problem. Question 4. 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. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Then why it is called a battery? Question 11. Answer: This is how the bell rings. This may cause a short circuit. It is said to be open. Extra Questions for Class 7 Science Chapter 14 Electric Current and Its Effects with Answers. 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. (b) Magnetic effect of current is used in electric bell and cranes to lift heavy magnetic materials from one place to other. 6. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis. 5. Answer: The key or switch can be placed anywhere in the circuit. Give the name any two electrical appliances in which electromagnets are used. 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. How does a fuse work? Answer: Name two electric devices for each where Every fuse is designed to carry current up to a certain maximum limit. Question 3. Where should be the key placed in a circuit? / By Prasanna. Answer: True 2. Answer: Working: When the iron strip is in contact with the screw, the current flows through the coil which becomes an electromagnet. Register online for Science tuition on Vedantu.com to score more marks in your examination. (a) The electric iron works on the basis of heating effect of electric current. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a … Question 5. 3. When an electric current is passed through a coil, it gets magnetised due to phenomena of magnetic effect of current. 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. Why is an electric fuse required in all electrical appliance? Exercise Questions. Answer: (b) Explain how does the resistance of a wire vary with its length. 5. Nutrition in Plants. Comment. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis. (a) Explain, what happens when live wire and neutral wire touches each other directly? [NCERT Exemplar; HOTS] Extra questions for Class 7 Science will build strong foundation for Class 7 science and higher clases. The value of the current in a circuit increases heavily at the time of short circuit. The flat spring brings back the iron armature to its original position and the clapper also moves away from the gong. When the switeh is in the ‘OFF’ position, the circuit is incomplete. 2. Explain. (d) We should never turn the switch in ON position Briefly state the effects of electricity. (i) The blood from the heart is transported to all parts of the body by the . We have Provided Water: A Precious Resource Class 7 Science MCQs Questions with Answers to help students understand the … False, because electric fuse is based on the heating effects of electric current. magnetic effect of current. [NCERT Exemplar; HOTS] Answer: Solution: Conductors: Iron and … Question 14. Answer: Many toys also have electromagnets inside them. 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. Question 1. (c) spring True/False If the current through the coil stops flowing. Answer: (i) The basic unit of time is second. Answer: NCERT Solutions for Class 7 Science Chapter 14 - Electric Current and its Effects. If the number of turns in the coil of an electromagnet is more, the strength of the electromagnet will be (b) magnetic effect of current is used. What is the full form of CFL? Electromagnets are used in electric bells. Question 2. Explain how a battery can be constructed. The students have to complete all the chapter in their 1 year of study. 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. Yes, electric current have other effect except heating, i.e. 1. good conductor (a) Heating effect of current is used in electric heater and geyser. 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