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 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 13 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. ..... instrument is used to measure the voltage. A) Ohmmeter. B) Ammeter. C) Galvanometer. D) Voltmeter. Show Answer Correct Answer: D) Voltmeter. 2. Electonic current flows from positive to negative? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 3. Like poles of a magnet will A) Repel. B) Attract. C) All the above. D) None of the above. Show Answer Correct Answer: A) Repel. 4. The distance between a positively charged object and a negatively charged object increases. If everything else remains constant, what happens to the electric force between the objects? A) The electric force remains constant. B) The electric force decreases. C) There is not enough information to answer this question. D) The electric force increases. Show Answer Correct Answer: B) The electric force decreases. 5. The magnetic field lines inside a current carrying solenoid, are: A) Along the axis and parallel to each other. B) Circular, but they do not intersect each other. C) Circular at the ends inside the solenoid. D) All of these. Show Answer Correct Answer: A) Along the axis and parallel to each other. 6. Position of a key or a switch in a circuit is A) Near the positive terminal of the bulb. B) Left to the battery. C) Can be place anywhere in the circuit. D) Right to the battery. Show Answer Correct Answer: C) Can be place anywhere in the circuit. 7. The direction of magnetic field lines due to a straight current carrying conductor B is given by: A) Maxwell's right-handed screw rule. B) Ohm's law. C) Coulomb's law. D) None of these. Show Answer Correct Answer: A) Maxwell's right-handed screw rule. 8. The acting contacts for circuit breakers are made of A) Stainless steel. B) Hard pressed carbon. C) Porcelain. D) Copper tungsten alloy. Show Answer Correct Answer: D) Copper tungsten alloy. 9. In making a battery(a) the positive terminal of one cell is connected to the negative terminal of the next cell(b) the positive terminal of one cell is connected to the positive terminal of the next cell(c) the negative terminal of one cell is connected to the negative terminal of the next cell(d) none of the above A) C. B) A. C) B. D) D. Show Answer Correct Answer: B) A. 10. If the current through the coil stops flowing. Will the coil remain an electromagnet? A) Yes. B) No. C) Not sure. D) Maybe. Show Answer Correct Answer: D) Maybe. 11. What would happen if you add more batteries to an electrical circuit containing light bulbs? A) The bulbs will be brighter. B) No charge. C) The bulbs will dim. D) The bulbs will last longer. Show Answer Correct Answer: A) The bulbs will be brighter. 12. The direction of magnetic field is given by which of the following rule A) Maxwell Right Hand Rule. B) Maxwell Right Hand Thumb Rule. C) Fleming's Right Hand Rule. D) Fleming's Right Hand Thumb Rule. Show Answer Correct Answer: B) Maxwell Right Hand Thumb Rule. 13. Who discovered the relationship between electricity and magnetism? A) Hans Christian Oersted. B) Albert Einstein. C) Isaac Newton. D) Michael Faraday. Show Answer Correct Answer: A) Hans Christian Oersted. 14. The device used to make or break an electric circuit is A) Switch. B) Resistor. C) Ammeter. D) Battery. Show Answer Correct Answer: A) Switch. 15. When do we use a battery? A) When more energy is not required. B) When no energy is required. C) When less energy than a single cell is required. D) When more energy than a single cell is required. Show Answer Correct Answer: D) When more energy than a single cell is required. 16. The term is used for the mode of nutrition in yeast, mushroom and bread-mould is A) Autotrophic. B) Insectivorous. C) Parasitic. D) Saprophytic. Show Answer Correct Answer: D) Saprophytic. 17. Water containing which of the following substances may conduct electricity A) Salt. B) Sugar. C) All the above. D) None of the above. Show Answer Correct Answer: A) Salt. 18. What charge do protons have? A) Negative. B) Positive. C) Neutral. D) None of the above. Show Answer Correct Answer: B) Positive. 19. Which of the following is most ecofriendly? A) Incandescent bulb. B) LED. C) CFL. D) None of the above. Show Answer Correct Answer: B) LED. 20. The ..... of the magnetic field is shown by the degree of closeness of the field lines. A) Total strength. B) Strength. C) Relative strength. D) Absolute strength. Show Answer Correct Answer: C) Relative strength. 21. The axis of Earth's magnet field is inclined with geographical axis at an angle of about: A) 45$^\circ$. B) 15$^\circ$. C) 5$^\circ$. D) 25$^\circ$. Show Answer Correct Answer: B) 15$^\circ$. 22. Chromium corrodes easily. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 23. Which of the following principles explains how an electric motor works? A) Magnetic force. B) Electromagnetism. C) Electrolysis. D) Magnetism. Show Answer Correct Answer: B) Electromagnetism. 24. What is the function of a dry cell? A) A conductor that connect the components together. B) A load in which moving charges can do a useful job. C) A source of electromotive force that drives electric charges around the circuit. D) A method of opening or closing the circuit. Show Answer Correct Answer: C) A source of electromotive force that drives electric charges around the circuit. 25. Waste from an electroplating factory must be disposed off A) In the nearby cornfield. B) In the nearby pond. C) According to the disposal guidelines of Waste Management Bodies. D) In the nearby river. Show Answer Correct Answer: C) According to the disposal guidelines of Waste Management Bodies. 26. An object through which electrons can easily flow is called a(n) ..... A) Conductor. B) Insulator. C) All the above. D) None of the above. Show Answer Correct Answer: A) Conductor. 27. What is full form of MRI? A) Magneto Ray Idometry. B) Medical Radiometer Instrument. C) Magnetic Resonance Imaging. D) Magnetic Radiology Imaging. Show Answer Correct Answer: C) Magnetic Resonance Imaging. 28. N a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should A) Decrease resistance in series with the cell whose emf is to be measured. B) Increase resistance in the main circuit. C) Increase resistance in series with the cell whose emf is to be determined. D) Decrease resistance in the main circuit. Show Answer Correct Answer: C) Increase resistance in series with the cell whose emf is to be determined. 29. Ocean currents transport matter and energy. Besides water, ocean currents also carry important matter such as ..... , ..... and ..... necesary for the survival of marine organisms. A) Fresh water, ice and warm water. B) Coconuts, plankton and sand dollars. C) Nitrogen, carbon dioxide, and oxygen. D) None of the above. Show Answer Correct Answer: C) Nitrogen, carbon dioxide, and oxygen. 30. Poor conductor of electricity A) Sea water. B) Lemonade. C) Mineral water. D) Glucose. Show Answer Correct Answer: D) Glucose. 31. You close the switch to turn on a device or to turn on a light.True or false A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 32. What is the use of electrolysis- A) Electroplating. B) Electrorefining. C) Production of metals and non metals. D) All of the above. Show Answer Correct Answer: D) All of the above. 33. Electromagnets are not used to lift heavy loads. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 34. A student drops some nails into a trash can half filled with wood shavings. Which is a way to separate the mixture of nails and shavings?sifting A) Flotation. B) Using a filter. C) Sifting. D) Evaporation. Show Answer Correct Answer: C) Sifting. 35. Full form of-CFL A) Compact Fluorescent Lamp. B) Compact Flood Lamp. C) Compact Flood Light. D) Common Full Light. Show Answer Correct Answer: A) Compact Fluorescent Lamp. 36. An electric bulb is an example of the heating effect of an electric current A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 37. Temperature and salinity differences in ocean water cause: A) Mid-ocean ridges. B) Deep Currents. C) Surface Currents. D) High tide and low tide. Show Answer Correct Answer: B) Deep Currents. 38. Name the scientist who discovered electromagnetism. A) Hans Christian Orested. B) Hans Christian Orsted. C) Hans Christian Oersted. D) Han Christian Oersted. Show Answer Correct Answer: C) Hans Christian Oersted. 39. When does an electromagnet lose its magnetic Property? A) When its switched off. B) When heat is very high. C) When current is switched on. D) When current is very high. Show Answer Correct Answer: A) When its switched off. 40. Which of the following is being used in place of fuses? A) Nichrome. B) MCB. C) Filament. D) Switch. Show Answer Correct Answer: B) MCB. 41. Which part of a circuit starts and stops the flow of electrical current? A) Battery. B) Light bulb. C) Wire. D) Switch. Show Answer Correct Answer: D) Switch. 42. How many terminals a cell has A) Two, both positive. B) Two, both negative. C) Two, one positive and another negative. D) None of the above. Show Answer Correct Answer: C) Two, one positive and another negative. 43. When an electric current flows through the wire it gets heated it is known as the heater A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 44. One disadvantage for physiological effects of electric current A) To do echo-cardiogram. B) Respiratory paralysys. C) Electro Shocker-for the safety. D) Galvanotherapy. Show Answer Correct Answer: B) Respiratory paralysys. 45. The amount of heat H produced in time t is A) QV. B) VIt. C) VI. D) 1/VIt. Show Answer Correct Answer: B) VIt. 46. The positive ions are known as- A) Anode. B) Anions. C) Cations. D) Cathode. Show Answer Correct Answer: C) Cations. 47. In the following formula, what represents the charge? A) F$_{e}$. B) Q. C) E. D) None of the above. Show Answer Correct Answer: B) Q. 48. Which type of material DOES NOT allow electric current to flow through it? A) An insulator. B) A conductor. C) A metal. D) A magnet. Show Answer Correct Answer: A) An insulator. 49. A student conducts an experiment by dropping a ball from different heights and measuring the time it takes to hit the ground. What is the independent variable in this experiment? A) The height from which the ball is dropped. B) The time it takes for the ball to hit the ground. C) The mass of the ball. D) The type of ball used. Show Answer Correct Answer: A) The height from which the ball is dropped. 50. Choose insulator from the following: A) Distilled water. B) Plastic. C) Wood. D) All of them. Show Answer Correct Answer: D) All of them. 51. A combination of two or more cells is called ( ) A) Battery. B) An Electric cell. C) Truck Battery. D) A Button cell. Show Answer Correct Answer: A) Battery. 52. Which of the following best describes the law of conservation of energy? A) Energy can be created and destroyed. B) Energy can be transformed from one form to another, but the total amount remains constant. C) Energy is always lost as heat. D) Energy is only conserved in closed systems. Show Answer Correct Answer: B) Energy can be transformed from one form to another, but the total amount remains constant. 53. The electric bell makes use of A) A bar shaped electromagnet. B) A ring shaped electromagnet. C) A U shaped electromagnet. D) No electromagnet. Show Answer Correct Answer: C) A U shaped electromagnet. 54. What is the current through a 11V bulb with a power of 99W? A) P. B) 60A. C) Swine. D) 60V. Show Answer Correct Answer: A) P. 55. If the number of turns in a coil is increased then the magnetic field produced by it will: A) Increase. B) Decrease. C) Remains unchanged. D) None of these. Show Answer Correct Answer: A) Increase. 56. An electric current that has constant magnitude and direction over time is known as a(n) A) Direct current. B) Alternating current. C) Simple current. D) None of the above. Show Answer Correct Answer: A) Direct current. 57. On what principle is electric bell based? A) Heating effect of current. B) Magnetic effect of current. C) All the above. D) None of the above. Show Answer Correct Answer: B) Magnetic effect of current. 58. The combination of two or more cells is known as:- A) Battery. B) MCB. C) Cell. D) None of these. Show Answer Correct Answer: A) Battery. 59. The thicker wire has low resistance because ..... electric charges can flow through it. A) Same number. B) Less. C) More. D) None of the above. Show Answer Correct Answer: C) More. 60. Which among the following is the disadvantage of heating effect of current? A) 1.It can break the insulation of wires/ devices. B) 2.It prevents energy loss. C) 3.It is used in working of electric fuse. D) None of the above. Show Answer Correct Answer: A) 1.It can break the insulation of wires/ devices. ← 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