Which electromagnet will attract more pins? When does a circuit is said to be overloaded? 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. Will the coil remain an electromagnet? Question 12. For more info feel free to reach us and we will guide you at the earliest possibility. At the same time, she listened the voice of her 4 years old daughter from the same room where she was ironing the clothes. When a switch is in OFF position, [NCERT Exemplar] The students have to complete all the chapter in their 1 year of study. It contains chapter-wise answers to all the questions so that students of Class 7 can prepare well for exams. Difference between an open circuit and a closed circuit. (a) lesser An iron strip with a hammer at one end is kept close to the electromagnet. 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. 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. 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. The device used in these days in place of electric fuse is MCB (Miniature Circuit Breaker). 1. What are complete and incomplete circuits? 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. (a) deflects a magnetic needle placed near it (a) Due to the low resistance and strength of aluminium and coppers, both these metals are usually employed for the transmission of electricity. Name some electric appliances where the heating effect of the electric current is used. Where should be the key placed in a circuit? 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. Question 19. Question 6. Why should we not touch a lighted electric bulb connected to the mains? Electric fuse is based on the magnetic effect of electric current. (d) element (d) same Then, how are the terminals of the cells connected? [NCERT Exemplar; HOTS] State one measure to avoid overloading in an electrical circuit. 2. 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. 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. Name it. Due to this reason, the nails attract the pins. The flat spring brings back the iron armature to its original position and the clapper also moves away from the gong. Fill in the blanks. An electromagnet can be switched OFF or switched ON as desired and this is not possible in the permanent magnets. In trucks, tractors and inverters, cells are internally arranged and we need not to connect it externally, so we called it as batteries. What happens to the current in a circuit at the time of short circuit? Students can utilize these solutions for adapting to and solving complex problems and completely understand the concepts explained by different topics. Name the device used these days in place of eiectric fuses in electrical circuits. Answer: Class 7 Science MCQs Questions with Answers Chapter Wise PDF Download. [Value Bated Question] Answer: Which of the following characteristic is most suitable material for making the care of an electromagnet? When the switch is in the ‘ON’ position, the circuit from the positive terminal of the battery to the negative terminal is complete. It no longer attracts the iron strip. It is said to be open. Choose the correct answer: Question 1. Write construction and working of an electric bell. Answer: (a)-(ii) Since the magnetic effect directly depends on the number of turns of the coil. Question 2. In the bulb there is a thin wire, called the filament, which glows when an electric current passes through it. Answer: The coil acts as an electromagnet. 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. Due to this, the armature vibrates forwards and backwards rapidly each time making the clapper strike the gong. 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. Electric Current and Its Effects Class 7 MCQs Questions with Answers. (b) greater, Question 4. (a) Brass (i) The basic unit of time is second. (e)-(v) The key or switch can be placed anywhere in the circuit. State the property of a conducting wire is utilised in making electric fuse. Answer: Describe the role of a safety device in this situation. The hammer strikes the gong every time the circuit is completed. MCQ Questions for Class 7 Science with Answers are prepared as per the Latest Exam Pattern. Multiple Choice Questions 4. battery When the armature moves towards the magnet, its contact with the contact screw is broken. (a) Explain, what happens when live wire and neutral wire touches each other directly? 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