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 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In which of the following, effect of electric current is utilized? A) Heating Effect. B) Magnetic Effect. C) Chemical Effect. D) All of the above. Show Answer Correct Answer: D) All of the above. 2. What are the factors that influence the chemical effects of electric current? A) Color of the wires, length of the wires, material of the wires. B) Nature of the electrodes, nature of the electrolyte, concentration of the electrolyte, and current flowing through the circuit. C) Temperature of the room, time of day, humidity in the air. D) Voltage of the battery, size of the battery, shape of the battery. Show Answer Correct Answer: B) Nature of the electrodes, nature of the electrolyte, concentration of the electrolyte, and current flowing through the circuit. 3. What do you call a device that converts mechanical movement into electricity? A) Electric motor. B) Electric generator. C) Electric field. D) Electric plasma. Show Answer Correct Answer: B) Electric generator. 4. What is the formula for resistance? A) R = V x I. B) R = V + I. C) R = V/I. D) R = I/V. Show Answer Correct Answer: C) R = V/I. 5. The complete path through which an electric current is flowing is called A) Open circuit. B) Closed circuit. C) Both. D) None of the above. Show Answer Correct Answer: B) Closed circuit. 6. Several turns of wire around a compass or around a nail makes a ..... A) Electromagnet. B) Coil. C) Magnet. D) None of the above. Show Answer Correct Answer: B) Coil. 7. Nitric acid, sodium hydroxide are ..... electrolyte. A) Weak. B) Strong. C) None. D) None of the above. Show Answer Correct Answer: B) Strong. 8. Tins cans used for storing food are made by A) Chromium onto tin. B) Tin onto Iron. C) Tin onto Silver. D) Electroplating of iron onto tin. Show Answer Correct Answer: B) Tin onto Iron. 9. The vertical component of Earth's magnetic field at a place is equal to the horizontal component. What is the value of angle of dip at this place? A) (d) 90$^{o}$. B) (c) 60$^{o}$. C) A) $ 30^{o} $. D) (b) 45$^{o}$. Show Answer Correct Answer: D) (b) 45$^{o}$. 10. Which of these following cannot be harmed by electric current A) Plastic. B) Rubber. C) A & B. D) All of the above. Show Answer Correct Answer: C) A & B. 11. We have a ..... wire which connects some cells. A) Thin. B) Thick. C) None of the above. D) None of the above. Show Answer Correct Answer: B) Thick. 12. Lemon juice is ..... conductor A) Good. B) Bad. C) All the above. D) None of the above. Show Answer Correct Answer: A) Good. 13. In the process of electromagnetic induction: A) Electrical energy is transformed in the form of mechanical work. B) Chemical energy is converted in the form of electrical energy. C) Electrical energy is transformed in the mechanical energy. D) Mechanical work is transformed in the form of electrical energy. Show Answer Correct Answer: D) Mechanical work is transformed in the form of electrical energy. 14. Assertion:Sugar solution conducts electricity.Reason:Most liquids that conduct electricity are solutions of acids, bases, and salt A) Both A and R are true. R is the correct explanation of A. B) Both A and R are true, but R is not the correct explanation of A. C) A is true, but R is false. D) A is false, but R is true. Show Answer Correct Answer: D) A is false, but R is true. 15. Lightning is ..... A) A buildup of neutrons. B) A large discharge of static electricity. C) A high-voltage electric current. D) Harmless. Show Answer Correct Answer: B) A large discharge of static electricity. 16. An electric current can produce A) Heating effect. B) Chemical effect. C) Magnetic effect. D) All of these. Show Answer Correct Answer: D) All of these. 17. Which one of the following is based on the heating effect of current? A) Geyser. B) Immersion rod. C) Hair Dryer. D) All of these. Show Answer Correct Answer: D) All of these. 18. Fill in the Blanks:A Fuse Wire has ..... electrical resistance and ..... melting point. A) High, high. B) Low, high. C) Low, low. D) High, low. Show Answer Correct Answer: D) High, low. 19. When a switch is open ..... A) The circuit is working and gives energy. B) The circuit is broken and charges cannot flow. C) The circuit is turning lights on. D) I don't know ask Ms. Cednick. Show Answer Correct Answer: B) The circuit is broken and charges cannot flow. 20. A 2.0 m wire segment carrying a current of0.60 A oriented parallel to a uniform magnetic field of0.50 T experiences a force of what magnitude? A) 0. B) 0.30 N. C) 0.15 N. D) 6.7 N. Show Answer Correct Answer: A) 0. 21. What is current measured in? A) W (Watts). B) V (Volts). C) A (Amps). D) $\Omega$ (Ohms). Show Answer Correct Answer: C) A (Amps). 22. A closed path that electric current follows A) Circuit. B) Voltage. C) Resistance. D) Current. Show Answer Correct Answer: A) Circuit. 23. What is the chemical effect of electric current? A) Increase in temperature. B) Formation of new substances. C) Change in color. D) Formation of sound waves. Show Answer Correct Answer: B) Formation of new substances. 24. If the current flows in same direction the force between the conductors are ..... A) Lesser. B) Attractive. C) Greater. D) Repulsive. Show Answer Correct Answer: B) Attractive. 25. Chlorophyll is a A) Green pigment present in leaves. B) Brown coloured substance present in a tree. C) Red pigment present in fruit. D) Yellow pigment present in stem. Show Answer Correct Answer: A) Green pigment present in leaves. 26. Magnetic field is strongest at A) Near the poles. B) Inside the magnet. C) Outside the magnet. D) Along the parallel sides of the magnet. Show Answer Correct Answer: B) Inside the magnet. 27. Current flows through the circuit when the circuit is in the condition. ( ) A) Open. B) Broken. C) Incomplete. D) Closed. Show Answer Correct Answer: D) Closed. 28. ..... is called the increase in resistance per unit original resistance per degree kelvin rise of temperature A) Thermal velocity. B) Conducance. C) Temperature coefficient of electrical resistance. D) Temperature coefficient of electrical resistivity. Show Answer Correct Answer: C) Temperature coefficient of electrical resistance. 29. When the filament of the bulb breaks then why does the bulb stop glowing? A) Because the circuit is incomplete. B) Because the circuit is complete. C) Because the connection of wire becomes loose. D) Because the circuit gets entangled. Show Answer Correct Answer: A) Because the circuit is incomplete. 30. The average kinetic energy of the particles in a sample A) Temperature. B) Convection. C) Heat. D) Density. Show Answer Correct Answer: A) Temperature. 31. Which one of the following material of wire is used in making elements of heating devices? A) Tin-lead alloy. B) Copper. C) Nichrome. D) Any of the given options. Show Answer Correct Answer: C) Nichrome. 32. What size resistor would produce a 3 Amp current flow with a 12 Volt battery A) 3 Ohms. B) 1 Ohm. C) 4 Ohms. D) 12 Ohms. Show Answer Correct Answer: C) 4 Ohms. 33. If a toaster produces 12 ohms of resistance in a 120-volt circuit, what is the amount of current in the circuit? A) 0.1 amps. B) 10 amps. C) 1440 amps. D) 1 amp. Show Answer Correct Answer: B) 10 amps. 34. An ..... behaves like a magnet when an electric current passes through it. A) Electromagnet. B) Cell. C) Switch. D) Wire. Show Answer Correct Answer: A) Electromagnet. 35. What is a complete path through which electric charges can flow called? A) Electric resistance. B) Magnetic field. C) Electric circuit. D) Magnetic pole. Show Answer Correct Answer: C) Electric circuit. 36. What is electroplating? Provide an example. A) Example:Electroplating of gold onto a plastic spoon. B) Example:Electroplating of platinum onto a paper spoon. C) Example:Electroplating of diamonds onto a wooden spoon. D) Example:Electroplating of silver onto a copper spoon. Show Answer Correct Answer: D) Example:Electroplating of silver onto a copper spoon. 37. What are the three chemical effects of current? A) 1.Gas Bubbles may be formed at electrodes2. Metals may get deposited on electrodes3. Change of colour of the solution. B) 1.Heat produced at electrodes.2.Metals deposited on cathode.3.Evolution of smell. C) 1.Gas Bubbles may be formed on cathode.2. Metals may get deposited on electrolyte.3. Change of colour of the solution. D) None of the above. Show Answer Correct Answer: A) 1.Gas Bubbles may be formed at electrodes2. Metals may get deposited on electrodes3. Change of colour of the solution. 38. True or false. Electrons are bound in the nucleus of an atom. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: A) False. 39. All voltages are safe. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 40. A motor will make electrical energy change into A) Motion energy. B) Nothing. C) Chemical energy. D) Mechanical energy. Show Answer Correct Answer: D) Mechanical energy. 41. Electric current is the flow of ..... A) Protons. B) Electrons. C) Neutrons. D) None of them. Show Answer Correct Answer: B) Electrons. 42. Structures like bridges and automobiles are protected from corrosion by coating a layer of ..... A) Aluminium. B) Zinc. C) Iron. D) Copper. Show Answer Correct Answer: B) Zinc. 43. The coil of wire contained in an electric heater is known as A) Element. B) Circuit. C) Filament. D) Component. Show Answer Correct Answer: A) Element. 44. When two magnet brought same poles ..... and opposite poles ..... A) Repulsion and attraction. B) Attraction and repulsion. C) All the above. D) None of the above. Show Answer Correct Answer: A) Repulsion and attraction. 45. Your body is a ..... A) Conductor. B) Amphibian. C) I dont know. D) Insulator. Show Answer Correct Answer: A) Conductor. 46. Electric current has energy called A) Potential difference. B) Thermal energy. C) Electrical energy. D) Light energy. Show Answer Correct Answer: C) Electrical energy. 47. The electrolyte used to electroplate Cu on the spoon is A) COSO4. B) Fly. C) SNSSO4. D) None of the above. Show Answer Correct Answer: A) COSO4. 48. Filament of a bulb should have A) High melting point. B) Low melting point. C) All the above. D) None of the above. Show Answer Correct Answer: A) High melting point. 49. The fuse wire is made up of an ..... with ..... melting point. A) Alloy, low. B) Copper, low. C) Semiconductor, high. D) Silver, high. Show Answer Correct Answer: A) Alloy, low. 50. When an electric current is flowing through a conductor it A) Experiences a force when it is in a magnetic field. B) Experience no force when it is in a magnetic field. C) Experiences the force only if the field is of electromagnetic nature. D) All of the above. Show Answer Correct Answer: A) Experiences a force when it is in a magnetic field. 51. Which of the following chemical effects are observed while electrolysis? A) Discharge of gas bubbles. B) Discoloration of electrolyte (solution). C) Deposition of metal on electrode. D) All of the above. Show Answer Correct Answer: D) All of the above. 52. What would the circuit resistance be if a 7.5 Amp draw was present with the engine running and the charging system producing 15 Volts A) 2 Ohms. B) 15 Ohms. C) 0.3333 Ohms. D) 4 Ohms. Show Answer Correct Answer: A) 2 Ohms. 53. Hans Christian Oersted, in the year ..... , was the first one to observe deflection of a compass needle when the current passes through it. A) 1820. B) 1811. C) 1888. D) 1830. Show Answer Correct Answer: A) 1820. 54. The potential difference across a component is 5 V. The current flowing through the component is 10 A. What is the resistance of the component? A) 0.05 Oh. B) 2 oh. C) 50 oh. D) 0.5 Oh. Show Answer Correct Answer: D) 0.5 Oh. 55. Name the gas deposited on the negative electrode in electrolysis of water. A) Carbon Dioxide. B) Carbon Monoxide. C) Hydrogen. D) Oxygen. Show Answer Correct Answer: C) Hydrogen. 56. What unit do we measure current in? A) Watts (W). B) Candelas (CD). C) Volts (V). D) Amperes/Amps (A). Show Answer Correct Answer: D) Amperes/Amps (A). 57. The coil of wire found in appliances such as room heater, electric cooking heater is called ..... A) Red coil. B) Hot coil. C) Heat coil. D) Element. Show Answer Correct Answer: D) Element. 58. What is the effect of the flow of the Gulf Stream Current on Clifden, Ireland A) It makes the climate warmer. B) It makes the climate colder. C) It makes it rain less. D) It keeps the coastal area cool. Show Answer Correct Answer: A) It makes the climate warmer. 59. If a substance has a higher number of electrons than protons on its surface, what type of charge does it have? A) Neutral charged. B) Positively charged. C) Negatively charged. D) No charges at all. Show Answer Correct Answer: C) Negatively charged. 60. The glowing of filament bulb is due to A) Magnetic effect of current. B) Heating effect of electric current. C) Physical effect of electric current. D) Chemical effect of current. Show Answer Correct Answer: B) Heating effect of electric current. ← 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books