This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Poor conductors of electricity are called A) Conductors. B) Insulators. C) Semiconductors. D) Semi-Insulators. Show Answer Correct Answer: B) Insulators. 2. Electricity can be made by heating the junction of certain dissimilar metals. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 3. The process of depositing a layer of any desired metal on another material by means of electricity is called ..... A) Electric refining. B) Electroplating. C) Electric depositing. D) None of the above. Show Answer Correct Answer: B) Electroplating. 4. Lets start with an easy one. A combination of 2 or more cells is known as A) An electric cell. B) A battery. C) A switch. D) A bulb. Show Answer Correct Answer: B) A battery. 5. Sea water is an example of A) Bad conductor. B) Strong electrolyte. C) Weak electrolyte. D) None of these. Show Answer Correct Answer: B) Strong electrolyte. 6. What is the direction of conventional current flow? A) From positive terminal to negative terminal. B) From positive terminal to positive terminal. C) From negative terminal to positive terminal. D) From negative terminal to negative terminal. Show Answer Correct Answer: A) From positive terminal to negative terminal. 7. What charge does an electron have? A) Negative (-). B) Positive (+). C) Neutral or no charge (0). D) None of the above. Show Answer Correct Answer: A) Negative (-). 8. The magnetic lines of force in the middle of the current carrying solenoid are: A) Circles. B) Parallel to the axis of solenoid. C) Spirals. D) Perpendicular to the axis of solenoid. Show Answer Correct Answer: B) Parallel to the axis of solenoid. 9. The anode in electrolyte is negative. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 10. The magnitude of magnetism produced by an electric current in a wire depends upon-(a) Increases with an increase in the strength of electric current (b) Decreases, as the distance from the wire increases A) Both a, b. B) Only a. C) Only b. D) None. Show Answer Correct Answer: A) Both a, b. 11. Current density formula is A) Electric Current / length. B) Electric Current / area. C) Electric Current / volume. D) None of above. Show Answer Correct Answer: B) Electric Current / area. 12. 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. 13. 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. 14. What do you call a device that converts mechanical movement into electricity? A) Electric field. B) Electric motor. C) Electric generator. D) Electric plasma. Show Answer Correct Answer: C) Electric generator. 15. What is the formula for resistance? A) R = V x I. B) R = V/I. C) R = I/V. D) R = V + I. Show Answer Correct Answer: B) R = V/I. 16. 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. 17. 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. 18. Nitric acid, sodium hydroxide are ..... electrolyte. A) Weak. B) Strong. C) None. D) None of the above. Show Answer Correct Answer: B) Strong. 19. Tins cans used for storing food are made by A) Electroplating of iron onto tin. B) Chromium onto tin. C) Tin onto Iron. D) Tin onto Silver. Show Answer Correct Answer: C) Tin onto Iron. 20. 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) A) $ 30^{o} $. B) (b) 45$^{o}$. C) (c) 60$^{o}$. D) (d) 90$^{o}$. Show Answer Correct Answer: B) (b) 45$^{o}$. 21. 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. 22. 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. 23. Lemon juice is ..... conductor A) Good. B) Bad. C) All the above. D) None of the above. Show Answer Correct Answer: A) Good. 24. In the process of electromagnetic induction: A) Mechanical work is transformed in the form of electrical energy. B) Chemical energy is converted in the form of electrical energy. C) Electrical energy is transformed in the form of mechanical work. D) Electrical energy is transformed in the mechanical energy. Show Answer Correct Answer: A) Mechanical work is transformed in the form of electrical energy. 25. 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. ← 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 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 10Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books