This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Electric Current And Its Effects > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 12 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What does a fuse do? A) Melt down for no reason. B) Stop electricity. C) Stop excessive electricity. D) None of the above. Show Answer Correct Answer: C) Stop excessive electricity. 2. What is Voltameter? A) The positively charged ions formed when a chemicalcompoundsdissolves in water. B) The negatively charged ions formed when a chemical compound dissolves in water. C) An apparatus in which electrolysis is carried out, which consists of a vessel, two electrodes and an electrolyte. D) The electrically charged atoms or group of atoms formed when a chemical compound is dissolved in water. Show Answer Correct Answer: C) An apparatus in which electrolysis is carried out, which consists of a vessel, two electrodes and an electrolyte. 3. The unit to measure electric resistance is? A) Ohm. B) Volt. C) Joule. D) Ampere. Show Answer Correct Answer: A) Ohm. 4. Current can only flow if there is a/an A) Open circuit. B) Short circuit. C) Parallel circuit. D) Closed circuit. Show Answer Correct Answer: D) Closed circuit. 5. Do variations in temperature and salinity drive the Global Conveyor Belt? A) Maybe. B) No. C) Yes. D) None of the above. Show Answer Correct Answer: C) Yes. 6. What is an electromagnet based on? A) Electro-chemical effect of current. B) Magnetic effect. C) Magnetic effect of electric current. D) Electric current. Show Answer Correct Answer: C) Magnetic effect of electric current. 7. Electrons are ..... particles A) Negatively charged. B) Positive. C) Positively charged. D) Negative. Show Answer Correct Answer: A) Negatively charged. 8. Give one example for heating effect of the electric current. A) The wire gets hot when an electric current passes through it. B) The bulb gets cold when an electric current passes through it. C) All the above. D) None of the above. Show Answer Correct Answer: A) The wire gets hot when an electric current passes through it. 9. In electroplating, the article to be electroplated serves as ..... A) Conductor. B) Electrolyte. C) Anode. D) Cathode. Show Answer Correct Answer: D) Cathode. 10. Which works on the heating effect of electricity. A) Gas stove. B) Chimney. C) Electric Bell. D) None of These. Show Answer Correct Answer: D) None of These. 11. When an electric current is passed through the copper sulphate solution, copper sulphatedissociates into:(a) (b) (c) copper and sulphate(d) A) Copper and sulphur. B) Copper and oxygen. C) Copper and sulphate. D) None of these. Show Answer Correct Answer: C) Copper and sulphate. 12. A battery is a combination of(a) only single cell(b) only two cells(c) two or more cells(d) None of the above A) C. B) D. C) B. D) A. Show Answer Correct Answer: A) C. 13. During electroplating The electrolyte contains the dissolved salts of- A) Metal tobe coated. B) Any salt would do. C) Metal to be obtained. D) Metal at Cathode. Show Answer Correct Answer: A) Metal tobe coated. 14. He was credited for his discovery of electromagnetic induction. A) Benjamin Franklin. B) Michael Faraday. C) Thomas Edison. D) Nikola Tesla. Show Answer Correct Answer: B) Michael Faraday. 15. Ram saw a coil of wire glowing red hot in his room heater. What is it? A) Just a coil of wire that became very hot. B) Glower. C) Element. D) A new kind of bulb. Show Answer Correct Answer: C) Element. 16. When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because A) Current produces magnetic field around the electrodes. B) Current always produces air bubbles when passed through a liquid. C) Of the heating effect of current. D) Of the chemical effect of current. Show Answer Correct Answer: D) Of the chemical effect of current. 17. We can electroplate plastic on iron. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 18. When current is switched on in an electric bell, it converts ..... energy into ..... energy. A) Electrical, heat. B) Mechanical, sound. C) Electrical, sound. D) Electrical, light. Show Answer Correct Answer: C) Electrical, sound. 19. What is the current in a circuit with 6 ohms of resistance and a battery containing 24 Volts? A) 1/4 A. B) 0.4 A. C) 4 A. D) 144 A. Show Answer Correct Answer: C) 4 A. 20. In solid conductors, electric current is the flow of A) Positive and negative charges. B) Electrons. C) Negative ions. D) Protons. Show Answer Correct Answer: B) Electrons. 21. When you are shocked by static electricity, the charges move to produce a ..... A) Current. B) Electric force. C) All the above. D) None of the above. Show Answer Correct Answer: A) Current. 22. If the battery produced 12.6 V and what would be the current flow be for a 6 $\Omega$ resistor A) 15 A. B) 2.1 A. C) 2.4 A. D) 1.71 A. Show Answer Correct Answer: B) 2.1 A. 23. Filament of a bulb is made up of ..... because it offers very high resistance. A) Silver. B) Copper. C) Iron. D) Tungsten. Show Answer Correct Answer: D) Tungsten. 24. A fuse is used to save energy in electrical circuits. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 25. In dry cell it acts as positive terminal A) Zinc case. B) Carbon rod. C) Both. D) None of the above. Show Answer Correct Answer: B) Carbon rod. 26. Which of the following is NOT a chemical reaction caused by electric current passing through liquids A) Different smells can be released. B) The colour of the electrolyte changes. C) Metal coating can be formed on the electrodes. D) Bubbles can form near the electrodes. Show Answer Correct Answer: A) Different smells can be released. 27. The magnetic effect of electric current was discovered by- A) Darwin. B) Newton. C) Maxwell. D) Oasted. Show Answer Correct Answer: D) Oasted. 28. Electromagnets are ..... A) Permanent magnets. B) Temporary magnets. C) Natural magnets. D) None. Show Answer Correct Answer: B) Temporary magnets. 29. The device used to detect the direction of a current-carrying conductor in a magnetic field is called: A) Voltmeter. B) Galvanometer. C) Rheostat. D) Ammeter. Show Answer Correct Answer: B) Galvanometer. 30. Name of the scientist who discovered magnetic effect of electricity A) Thomas Edison. B) Hans Christian Oersted. C) Alexander G Bell. D) None of these. Show Answer Correct Answer: B) Hans Christian Oersted. 31. Substances through which electric charges cannot move freely- A) Insulators. B) Plastic. C) Wood. D) Conductors. Show Answer Correct Answer: A) Insulators. 32. Which one cools down slower? A) Water. B) Air. C) Land. D) None of the above. Show Answer Correct Answer: A) Water. 33. To change the direction of current in the armature, following device is used: A) Split ring or commutator. B) Pole pieces. C) Battery. D) Carbon brushes. Show Answer Correct Answer: A) Split ring or commutator. 34. The Earth's greatest source of energy comes from the ..... A) Precipitation. B) Rotation of its axis. C) Sun. D) Oceans currents. Show Answer Correct Answer: C) Sun. 35. You open a switch to stop the flow of electricity.True or false A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 36. Which of the following cannot be an example for the use of electromagnets A) Oven. B) Passionate. C) Phone. D) Electric Bell. Show Answer Correct Answer: A) Oven. 37. During electrolysis of water, A) Hydrogen gas is produced. B) Oxygen gas is produced. C) Water is produced. D) Both (a) and (b). Show Answer Correct Answer: D) Both (a) and (b). 38. Do electric currents move slow or fast? A) Slow. B) Fast. C) All the above. D) None of the above. Show Answer Correct Answer: A) Slow. 39. When acidified water is electrolysed using carbon electrodes. What is produced at (+) and (-) electrodes. A) (+)-Oxygen; (-)-Hydrogen. B) (+)-Oxygen; (-)-Carbon. C) (+)-Hydrogen (-)-Oxygen. D) None of the above. Show Answer Correct Answer: A) (+)-Oxygen; (-)-Hydrogen. 40. Atoms contain ..... types of subatomic particles. A) 4. B) 1. C) 3. D) 2. Show Answer Correct Answer: C) 3. 41. Which one is the polluting waste generated by electroplating factories? A) Used up electrodes. B) Electrolytes. C) Corroded Metals. D) None of the above. Show Answer Correct Answer: B) Electrolytes. 42. How does corrosion occur in metals? A) Corrosion occurs in metals when they react with substances in the environment, such as oxygen and water. B) Corrosion is caused by metals being exposed to strong magnetic fields. C) Corrosion happens in metals when they are stored in a vacuum. D) Corrosion occurs in metals due to excessive heat exposure. Show Answer Correct Answer: A) Corrosion occurs in metals when they react with substances in the environment, such as oxygen and water. 43. What unit is used to measure current? A) Omega. B) Amps. C) Volts. D) Ohms. Show Answer Correct Answer: B) Amps. 44. Electric potential is measured in ..... A) Volts. B) Amps. C) Friciton. D) None of the above. Show Answer Correct Answer: A) Volts. 45. Generators are devices that convert ..... energy into ..... energy. A) Electrical; mechanical. B) Chemical; mechanical. C) Potential; kinetic. D) Mechanical; electrical. Show Answer Correct Answer: D) Mechanical; electrical. 46. One of the following is not used for electroplating metal articles. the one is- A) Chromium. B) Sodium. C) Nickel. D) Silver. Show Answer Correct Answer: B) Sodium. 47. What is the power of a 20V bulb with 5A through it? A) I a. B) Sh. C) 100W. D) 100V. Show Answer Correct Answer: C) 100W. 48. What is the Coriolis effect? A) Heat transfer caused by the rising of hotter, less dense fluids and the falling of cooler, more dense fluids. B) A punk rock band. C) The apparent deflection of moving air as a result of Earth's rotation. D) The amount of matter in a given volume. Show Answer Correct Answer: C) The apparent deflection of moving air as a result of Earth's rotation. 49. If you bring a charged object near an electrically neutral surface without allowing the object to touch the surface, the charges in the surface are rearranged by A) Friction. B) Induction. C) Convection. D) Conduction. Show Answer Correct Answer: B) Induction. 50. If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that A) The silk has become negatively charged. B) Glass attracts more protons. C) Protons have moved to the rod. D) Friction destroyed electrons in the rod. Show Answer Correct Answer: A) The silk has become negatively charged. 51. Discuss the impact of electric current on the substances in terms of their chemical changes. A) Electric current can only cause substances to evaporate. B) Electric current has no impact on substances. C) Electric current only causes physical changes in substances. D) Electric current can cause chemical changes in substances by breaking down molecules or causing them to react with other substances. Show Answer Correct Answer: D) Electric current can cause chemical changes in substances by breaking down molecules or causing them to react with other substances. 52. Most liquids that conducts electricity are solutions of acids, bases and salts. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 53. What symbol do we use for current? A) I. B) O. C) C. D) A. Show Answer Correct Answer: A) I. 54. Why does the bulb glow when the electric current passes through it A) Due to the heating effect of the current. B) Due to the magnetic effect of the current. C) Both A and B. D) None of the above. Show Answer Correct Answer: A) Due to the heating effect of the current. 55. The leaves other than green also have A) Cells. B) Chlorophyll. C) Cuscuta. D) Stomata. Show Answer Correct Answer: B) Chlorophyll. 56. Students in a science class make models of deposition. What do their models show? A) How lava flows from volcanoes. B) How rocks are broken into particles. C) How rock particles build up new landforms. D) How water, ice, and wind move rock particles. Show Answer Correct Answer: C) How rock particles build up new landforms. 57. It is work done to move a unit of electrical charge from one point to another point in electric field. This refer to A) Resistance. B) Potential difference. C) Current. D) Power. Show Answer Correct Answer: B) Potential difference. 58. The colour of insulation of neutral wire is: A) Red. B) Yellow. C) Green. D) Black. Show Answer Correct Answer: D) Black. 59. An electrolyte is a ..... A) Liquid that does not conduct electricity. B) Solid that conducts electricity. C) Liquid that conducts Electricity. D) Solid that does not conduct electricity. Show Answer Correct Answer: C) Liquid that conducts Electricity. 60. When an electric current pass through a solenoid, acts as a/an? A) Resistor. B) Bar magnet. C) Insulater. D) Electric bell. Show Answer Correct Answer: B) Bar magnet. ← PreviousNext →Related QuizzesScience QuizzesClass 7 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 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books