This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 20 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of these materials is an insulator? A) Glass. B) Aluminum. C) Copper. D) Steel. Show Answer Correct Answer: A) Glass. 2. Movements of ocean water in a continuous flow are called? A) Ocean currents. B) Global winds. C) Air mass. D) Front. Show Answer Correct Answer: A) Ocean currents. 3. Kirchhoff's junction rule is a reflection of A) Conservation of current density vector. B) Conservation of charge and no accumulation of charge at the the junction. C) The momentum with which a charged particle approaches a junction is unchanged as the charged particle leaves the junction. D) Conservation of energy. Show Answer Correct Answer: B) Conservation of charge and no accumulation of charge at the the junction. 4. Electric bulbs generate more heat because? A) Tungsten is a heating element. B) Glass is good conductor of heat. C) Gas inside bulb heats up. D) None of the above. Show Answer Correct Answer: A) Tungsten is a heating element. 5. Charging by ..... occurs when electrons are transferred from one object to another by direct contact. A) Reduction. B) Induction. C) Conduction. D) Friction. Show Answer Correct Answer: C) Conduction. 6. For the purification of a copper rod, we have to connect ..... as the positive electrode A) Thin copper strip. B) Impure copper rod. C) Graphite rod. D) Iron nail. Show Answer Correct Answer: B) Impure copper rod. 7. When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in parallel. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 8. Rainwater is a better conductor of electricity when compared to distilled water. Which of the following is correct justification for the given statement? A) Absence of dissolved salts in rainwater. B) Ionic dissociation takes place in rainwater. C) Presence of oxygen in rainwater. D) Flow of charges is inhibited in rainwater. Show Answer Correct Answer: B) Ionic dissociation takes place in rainwater. 9. A horizontal movement of ocean water that is caused by wind and that occurs at or near the ocean's surface. A) Gulf Stream. B) Global Conveyor Belt. C) Surface Current. D) Gyre. Show Answer Correct Answer: C) Surface Current. 10. Which of these is used for detecting weak electric current passing through a liquid? A) Torch. B) LED. C) CFL. D) None of these. Show Answer Correct Answer: B) LED. 11. Distilled water does not conduct electricity A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 12. What do you make if you wrap a current-carrying wire around an iron bolt? A) Electromagnet. B) Electric motor. C) Generator. D) None of the above. Show Answer Correct Answer: A) Electromagnet. 13. At the time of short circuiting the current in the circuit: A) Reduces substantially. B) Does not change. C) Increase heavily. D) Vary continuously. Show Answer Correct Answer: C) Increase heavily. 14. The most conducting liquids are the solutions of ..... A) Acids. B) Bases. C) Salts. D) All of the above. Show Answer Correct Answer: D) All of the above. 15. When electric current passes through a conducting solution, it causes ..... A) Chemical reactions. B) Light effect. C) Magnetic effect. D) Nucleus reaction. Show Answer Correct Answer: A) Chemical reactions. 16. A magnetic field does not exert a force on: A) An electric charge moving perpendicular to the field. B) An iron bar. C) A stationary charge. D) A magnetic needle. Show Answer Correct Answer: C) A stationary charge. 17. A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly forliquid A while it glows very dimly for liquid B. A) Liquid A is a better conductor than Liquid B. B) Liquid B is a better conductor than Liquid A. C) Both liquids are equally conducting. D) We cannot compare the conductivity this way. Show Answer Correct Answer: A) Liquid A is a better conductor than Liquid B. 18. Wires made from some special materials melt quickly and break when large electric currents are passed through them. These wires are used for making ..... ? A) Electric switch. B) Electric bulb. C) Electric shock. D) Electric fuses. Show Answer Correct Answer: D) Electric fuses. 19. Electric Current and Its Effect A) It is a device that stores electric charge. B) It is a device that converts chemical energy into electrical energy. C) It is a device that measures electric current. D) It is a device that opens or closes an electric circuit. Show Answer Correct Answer: B) It is a device that converts chemical energy into electrical energy. 20. A material in which electrons are able to move easily A) Circuit. B) Insulator. C) Resistance. D) Conductor. Show Answer Correct Answer: D) Conductor. 21. Which effect of current is used in an electric fuse? A) Lightning effect. B) Insulating effect. C) Flowing effect. D) Heating effect. Show Answer Correct Answer: D) Heating effect. 22. The magnetic field inside a current-carrying solenoid is: A) Zero. B) Constant. C) Weaker at the center. D) Stronger at the center. Show Answer Correct Answer: D) Stronger at the center. 23. A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is A) 1.0 amp-m2. B) 1.2 amp-m2. C) 0.5 amp-m2. D) 0.8 amp-m2. Show Answer Correct Answer: B) 1.2 amp-m2. 24. What is latitude? A) A measure of the distance away from the prime meridian. B) A measure of how warm a climate is. C) A measure of an angle in Math class. D) A measure of the distance away from the equator. Show Answer Correct Answer: D) A measure of the distance away from the equator. 25. What is the electrode to which negative ions move? A) Anode. B) Cathode. C) Electrolyte. D) Conductor. Show Answer Correct Answer: A) Anode. ← 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