This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 22 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The electric heating is used in A) Fuse. B) Light. C) Heater. D) All of the above. Show Answer Correct Answer: D) All of the above. 2. Connection of more than one device/ appliance to a single socket is called- A) Overloading. B) Short circuit. C) Both. D) None of the above. Show Answer Correct Answer: A) Overloading. 3. The magnetic lines of force produced by a bar magnet: A) Originate from North pole and end at infinity. B) Originate from North pole and ends at its South pole. C) Originate from South pole and end at North pole. D) Originate from South pole and ends at its West pole. Show Answer Correct Answer: B) Originate from North pole and ends at its South pole. 4. An electric bulb is connected to a 220 V generator. The current is 2 A. What is the power of the bulb? A) 110 watt. B) 220 watt. C) 440 watt. D) 330 watt. Show Answer Correct Answer: C) 440 watt. 5. What is the role of the soft iron core in an electromagnet? A) Increases resistance. B) Decreases magnetic strength. C) Enhances the magnetic field. D) Reduces the number of turns. Show Answer Correct Answer: C) Enhances the magnetic field. 6. A galvanometer is a device which is used to: A) Detect the current in the circuit. B) Measure potential difference between two points. C) Measure emf of a cell. D) None of these. Show Answer Correct Answer: A) Detect the current in the circuit. 7. A region around a charged particle that can exert a force on another charged particle is called an A) Electric pulse. B) Electric charge. C) Electric force. D) Electric field. Show Answer Correct Answer: D) Electric field. 8. Fill in the blanks:In the symbol of electric cell, the ..... line represents the positive terminal and the thicker, ..... line represents negative. A) Shorter, longer. B) Longer, shorter. C) Short, shorter. D) Long, longer. Show Answer Correct Answer: B) Longer, shorter. 9. Name two factors that affect the chemical effects of electric current. A) Color of the electrodes and color of the electrolyte. B) Temperature and pressure. C) Nature of the electrodes and nature of the electrolyte. D) Size of the electrodes and size of the electrolyte. Show Answer Correct Answer: C) Nature of the electrodes and nature of the electrolyte. 10. A battery is used as a driving force in an electric circuit. True or false? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. The positive ion moves towards the A) Cathode. B) Anode. C) Cation. D) Diode. Show Answer Correct Answer: A) Cathode. 12. The breaking down of a substance into its component elements by passing an electric current through it is called ..... A) Thermal decomposition. B) Electrolysis. C) Electrical breakdown. D) None of the above. Show Answer Correct Answer: B) Electrolysis. 13. Electrical energy is produced at a ..... and then sent to a step up transformer to increase the voltage. A) School. B) Power plant. C) Store. D) Stadium. Show Answer Correct Answer: B) Power plant. 14. Two end of a magnet are called A) Magnet. B) Poles of magnet. C) All the above. D) None of the above. Show Answer Correct Answer: B) Poles of magnet. 15. The phenomenon of the induction of an electric current in a coil due to a change in magnetic field is known as: A) Electromagnetic induction. B) Magnetic induction. C) Electric induction. D) Faraday's induction. Show Answer Correct Answer: A) Electromagnetic induction. 16. Milk is a ..... conductor. A) Good. B) Bad. C) All the above. D) None of the above. Show Answer Correct Answer: A) Good. 17. Wires made from some special materials melt quickly and break when a large electric current passes through it.these wires are used to make A) Fuses. B) Electric fuses. C) A&B. D) Electromagnet. Show Answer Correct Answer: B) Electric fuses. 18. . 6.The intensity of magnetic field between the poles of an electromagnet would be unchanged, if: A) Current in the electromagnet coil is doubled. B) Distance between the poles of electromagnet is halved. C) Direction of current in the electromagnet coil is reversed. D) Material of its core is changed. Show Answer Correct Answer: C) Direction of current in the electromagnet coil is reversed. 19. The magnetic field inside a solenoid carrying current is almost: A) Non-uniform. B) Uniform. C) Both (a) and (b). D) None of these. Show Answer Correct Answer: B) Uniform. 20. Which of the following correctly describes the magnetic field near a straight wire carrying current: A) The field is uniform. B) The field is non-uniform. C) The field consists of concentric circles centered on the wire. D) None of these. Show Answer Correct Answer: C) The field consists of concentric circles centered on the wire. 21. The strength of the magnetic field produced by a current-carrying conductor depends on: A) Length of the conductor. B) Type of material. C) Current flowing through the conductor. D) All of the above. Show Answer Correct Answer: D) All of the above. 22. In a bulb there is a thin wire called A) Filament. B) Coil. C) Fuse. D) Element. Show Answer Correct Answer: A) Filament. 23. The filament of an electric bulb is made of: A) Iron. B) Copper. C) Tungsten. D) Aluminum. Show Answer Correct Answer: C) Tungsten. 24. What do you call a device that produces an electric current when a coil of wire is wrapped around an iron core and rotated near a magnet? A) Magnet. B) Car. C) Generator. D) Motor. Show Answer Correct Answer: C) Generator. 25. What are the three basic parts of an electric motor? A) Commutator, stator, and rotor. B) Armature, brushes, and battery. C) Commutator, armature, and brushes. D) Battery, armature, and DC power supply. Show Answer Correct Answer: A) Commutator, stator, and rotor. ← PreviousNext →Related QuizzesClass 7 Science Chapter 10 Electric Current And Its Effects Quiz 1Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 2Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 3Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 4Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 5Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 6Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 7Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 8Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 9Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books