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 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A straight wire carrying a 9.0 A current is in a uniform magnetic field oriented at right angles to the wire. When 75 cm of wire is in the field, the force on the wire is 1.2 N. What is the strength of the magnetic field (B)? HINT:F=I.L.B A) = 0.18 T. B) = 0.18 Cm. C) = 0.18 N. D) = 0.18. Show Answer Correct Answer: A) = 0.18 T. 2. In most electrical circuits, the pathway is made of: A) Wood. B) Metal. C) Static. D) Plastic. Show Answer Correct Answer: B) Metal. 3. A bell only rings one time when switched on (The gong is hit only one time) because- A) Insufficient Electricity. B) Electromagnet turned to or replaced by a permanent magnet. C) A mystical force. D) Wiring Problem. Show Answer Correct Answer: B) Electromagnet turned to or replaced by a permanent magnet. 4. In electromagnetic induction, the direction of the induced current is given by: A) Lenz's Law. B) Hooke's Law. C) Ohm's Law. D) Joule's Law. Show Answer Correct Answer: A) Lenz's Law. 5. Unlike poles of a magnet do what? A) Repel. B) Attract. C) Nothing. D) None of the above. Show Answer Correct Answer: B) Attract. 6. A path that is made for an electric current is? A) Static electricity. B) Conductor. C) Resistor. D) A circuit. Show Answer Correct Answer: D) A circuit. 7. Which of the following is/are the applications of Electrolysis? A) Reusing of Metals. B) Extraction of Metals. C) Recycling Metals. D) None of these. Show Answer Correct Answer: B) Extraction of Metals. 8. To make a battery the terminals of two cells should be placed such that A) The positive terminal of one cell should be connected to the positive terminal of another cell. B) The positive terminal of one cell should be connected to the negative terminal of another cell. C) The negative terminal of one cell should be connected to negative terminal of another cell. D) The positive terminal of one cell should not be connected to negative terminal of another cell. Show Answer Correct Answer: B) The positive terminal of one cell should be connected to the negative terminal of another cell. 9. Which of the following liquid is not a good conductor of electricity? A) Vinegar. B) Tap water. C) Honey. D) Orange juice. Show Answer Correct Answer: C) Honey. 10. The following is the formula for ..... F$_{e}$ = q x E A) Friction. B) Electric Force. C) Charge. D) None of the above. Show Answer Correct Answer: B) Electric Force. 11. Use and throw fuse is? A) Electric fuse. B) Ceramic fuse. C) Cartridge fuse. D) MCB. Show Answer Correct Answer: C) Cartridge fuse. 12. The coil of wire used in Electric Heaters is called as ..... A) Element. B) Source. C) Both of these. D) None of the above. Show Answer Correct Answer: A) Element. 13. What is true about electricity and magnetic fields? A) Electricity is needed to create any magnet. B) Electricity is stronger than a magnetic field. C) Electricity prevents magnetic fields from occurring. D) Electricity always creates a magnetic field. Show Answer Correct Answer: D) Electricity always creates a magnetic field. 14. How much current is produced in an electric iron consumes energy at a rate of 880 W with the voltage is 220 V? A) 2 ampere. B) 8 ampere. C) 4 ampere. D) 6 ampere. Show Answer Correct Answer: C) 4 ampere. 15. Explain the chemical effects of electric current with an example. A) Electric current has no chemical effects. B) One example is the electrolysis of water, where water molecules are split into hydrogen and oxygen gases. C) Electric current turns water into solid ice. D) Electric current causes explosions in water. Show Answer Correct Answer: B) One example is the electrolysis of water, where water molecules are split into hydrogen and oxygen gases. 16. The process of depositing a layer of desired metal on another metal A) Electrogram. B) Electroplating. C) Electrolysis. D) Electrophoresis. Show Answer Correct Answer: B) Electroplating. 17. Who was the first person to notice the deflection of compass needle everytime the current was passed through a wire kept nearby? A) Hans Christian Oersted. B) Albert Einstein. C) Michael Faraday. D) Thomas Edison. Show Answer Correct Answer: A) Hans Christian Oersted. 18. What happens when the circuit is open? A) Static discharge. B) Lightning. C) Device won't work. D) Light bulb comes on. Show Answer Correct Answer: C) Device won't work. 19. Electric bell works on ..... effect of current A) Heating effect. B) Magnetic effect. C) Lighting effect. D) None of these. Show Answer Correct Answer: B) Magnetic effect. 20. In a uniform magnetic field the field, lines are: A) Concentric circles. B) Parallel lines. C) Non-parallel lines. D) None of these. Show Answer Correct Answer: B) Parallel lines. 21. Which of the following appliances is not based on the principle of heating effect of electric current? A) Electric iron. B) Electric kettle. C) Electric bell. D) Electric bulb. Show Answer Correct Answer: C) Electric bell. 22. The average relaxation time during collision of electrons with atoms is A) 10$^{14}$. B) 10$^{-10}$. C) 10$^{-14 }$sec. D) 10$^{4}$. Show Answer Correct Answer: C) 10$^{-14 }$sec. 23. Substances that conduct electricity are called ..... A) Conductors. B) Insulators. C) Semi-conductors. D) All of the above. Show Answer Correct Answer: A) Conductors. 24. What is found in the nucleus of an atom? A) Protons and electrons. B) Neutrons and electrons. C) Protons and neutrons. D) None of the above. Show Answer Correct Answer: C) Protons and neutrons. 25. Electric kettles and radiators use the effect of current flow known as: A) Magnetic. B) Heating. C) Thermal. D) Mechanical. Show Answer Correct Answer: B) Heating. 26. Directions of drift velocity of electrons and electric field are A) In same direction. B) Opposite to each other. C) Fluctuated. D) None of above. Show Answer Correct Answer: B) Opposite to each other. 27. What device changes mechanical kinetic energy into electrical energy? A) Electric motor. B) Electromagnet. C) Insulator. D) Generator. Show Answer Correct Answer: D) Generator. 28. Current in an electric circuit can exceeds it's maximum limit when, A) 3.Insulation break down. B) 4.Touching of two live wires. C) 2.Touching of two neutral wires. D) 1.One device is connected to the socket. Show Answer Correct Answer: A) 3.Insulation break down. 29. Ordinary cells used in torches are ..... A) Not recharged when exhausted. B) Rechargeable. C) Rechargeable when exhausted. D) Chargeable. Show Answer Correct Answer: A) Not recharged when exhausted. 30. Like poles of a magnet do what? A) Repel. B) Attract. C) Nothing. D) None of the above. Show Answer Correct Answer: A) Repel. 31. The direction of induced current is determined by: A) Fleming's left hand rule. B) Fleming's right hand rule. C) Corkscrew rule. D) None of these. Show Answer Correct Answer: B) Fleming's right hand rule. 32. The North pole of Earth's magnetic field is in the: A) Geographical West. B) Geographical South. C) Geographical North. D) Geographical East. Show Answer Correct Answer: B) Geographical South. 33. Why is LED preferred to other type of bulbs? A) It is cheap. B) It works efficiently. C) It can glow even when high or more current flows through it. D) It can glow even when weak or less current flows through it. Show Answer Correct Answer: D) It can glow even when weak or less current flows through it. 34. What happens to the strength of the magnetic field when the current through a wire is increased? A) Remains the same. B) Decreases. C) Increases. D) Becomes zero. Show Answer Correct Answer: C) Increases. 35. Which of the following phenomenon occurs when two naked wires of electricity supply line touch each other? A) Overloading. B) Short circuiting. C) Lightening. D) None of these. Show Answer Correct Answer: B) Short circuiting. 36. Rechargeable batteries are batteries that can have their internal chemical reaction: A) Reversed. B) Discharged. C) Charged. D) Partially charged. Show Answer Correct Answer: A) Reversed. 37. Metal which is electroplated on car parts such as bumpers. A) Aluminium. B) Iron. C) Chromium. D) Copper. Show Answer Correct Answer: C) Chromium. 38. The symbol used to express the current is ..... A) V. B) R. C) C. D) I. Show Answer Correct Answer: D) I. 39. A basic voltaic cell consists of two different metal electrodes immersed in an electrolyte. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 40. In fleming's left hand rule the fore finger denotes the direction of ..... A) Magnetic field. B) Force. C) Current. D) None of these. Show Answer Correct Answer: A) Magnetic field. 41. An electric motor is a device which transforms: A) Heat energy into electrical energy. B) Electrical energy into mechanical energy. C) Electrical energy into heat energy. D) Mechanical energy into electrical energy. Show Answer Correct Answer: B) Electrical energy into mechanical energy. 42. The S.I. unit of magnetic field is: A) Ampere. B) Volt. C) Ampere. D) Tesla. Show Answer Correct Answer: D) Tesla. 43. What is the relationship between Rubber and Insulator? A) Rubber:Insulator. B) Rubber:Conductor. C) Rubber:Metal. D) Rubber:Liquid. Show Answer Correct Answer: A) Rubber:Insulator. 44. What is the primary difference between a series circuit and a parallel circuit? A) A series circuit has only one path for current to flow, while a parallel circuit has multiple paths. B) A series circuit has multiple paths for current to flow, while a parallel circuit has only one path. C) A series circuit requires a battery, while a parallel circuit does not. D) A series circuit uses alternating current, while a parallel circuit uses direct current. Show Answer Correct Answer: A) A series circuit has only one path for current to flow, while a parallel circuit has multiple paths. 45. What are conductors in the context of electricity? A) Materials that absorb electric current. B) Elements that generate electric current. C) Substances that block the flow of electric current. D) Materials that allow the flow of electric current. Show Answer Correct Answer: D) Materials that allow the flow of electric current. 46. Who discovered the magnetic field of electric current? A) James Kristin Oersted. B) Hans Christian Oersted. C) Lans Christin Oestred. D) Hans Christin Oyster. Show Answer Correct Answer: B) Hans Christian Oersted. 47. All liquids conduct electricity. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 48. The sure test of magnetism is: A) Attraction. B) Repulsion. C) Both (a) and (b). D) None of these. Show Answer Correct Answer: B) Repulsion. 49. The device which transfers energy to electric charges in a circuit is A) Ammeter. B) Voltmeter. C) Battery. D) Electric switch. Show Answer Correct Answer: C) Battery. 50. Which of these charges has the greatest magnitude? A) A charge of +3. B) A charge of-1. C) A charge of-4. D) A charge of +1. Show Answer Correct Answer: C) A charge of-4. 51. If the number of turns in the coil of an electromagnet is more, the strength of the electromagnet will be A) Lesser. B) Greater. C) None of these. D) Same. Show Answer Correct Answer: B) Greater. 52. Element of an electric iron is made up of A) Nickel. B) Tungsten. C) Nichrome. D) Chromium. Show Answer Correct Answer: C) Nichrome. 53. Can we magnetise an iron object with electromagnet A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: A) Yes. 54. Radhika wants to electroplate a plate with ZINC. She has a Zinc bar and the plate. But she does not know which should be the anode and which should be the cathode. A) Zinc Bar-Anode, Plate-Cathode. B) Zinc Bar-Cathode, Plate-Anode. C) Both Anode and Cathode should be Zinc. D) None of the above. Show Answer Correct Answer: A) Zinc Bar-Anode, Plate-Cathode. 55. What is a cation's charge? A) Negative. B) Neutral. C) Positive. D) Depends on the element. Show Answer Correct Answer: C) Positive. 56. Who invented MAGNETIC EFFECT OF ELECTRIC CURRENT? A) Hans Zimmer. B) Hans Christian Oersted. C) Hans Christian Andersen. D) None of the above. Show Answer Correct Answer: B) Hans Christian Oersted. 57. A combination of two of more cells is known as A) Filament. B) Electric cell. C) Button cell. D) Battery. Show Answer Correct Answer: D) Battery. 58. The direction of current flow is taken from A) Negative to positive terminal. B) Positive to negative terminal. C) Both. D) None of the above. Show Answer Correct Answer: B) Positive to negative terminal. 59. Which of the following statements is incorrect about the conductivity of water? A) On addition of table salt, water conducts electricity. B) On addition of lemon juice, water conducts electricity. C) Rain water is a good conductor of electricity. D) Tap Water is a bad conductor of electricity. Show Answer Correct Answer: D) Tap Water is a bad conductor of electricity. 60. What happens when an electric current is passed through an electrolyte? A) Biological reaction takes place. B) Physical reaction takes place. C) Chemical reaction takes place. D) No reaction takes place. Show Answer Correct Answer: C) Chemical reaction takes place. ← 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books