This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Current can produce magnetic field A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. Define electric current. A) It is the work done by the source in driving charges around a complete circuit. B) It is a measure of the rate of flow of electric charge through a given cross-section of a conductor. C) It is the work done by the source in driving a unit charge around a complete circuit. D) It is a measure of the flow of electric charge through a given cross-section of a conductor. Show Answer Correct Answer: B) It is a measure of the rate of flow of electric charge through a given cross-section of a conductor. 3. What size resistor would produce a 3 A current flow with a 12 V battery A) 1 Ohm. B) 3 Ohms. C) 4 Ohms. D) 12 Ohms. Show Answer Correct Answer: C) 4 Ohms. 4. North pole is also called North Seeking Pole. A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 5. When a current flows into a wire, such as a wire that connects a battery to a light, the wire stays electrically ..... A) Unbalanced. B) Charged. C) Neutral. D) Uncharged. Show Answer Correct Answer: C) Neutral. 6. Magnetic force and gravitational force are examples of ..... A) Contact forces. B) Magic. C) Non-contact forces. D) Holla-Ballew. Show Answer Correct Answer: C) Non-contact forces. 7. The movement of electrons from atom to atom in a closed wire results in a flow of ..... A) Electric current. B) Electric voltage. C) Electron. D) Proton. Show Answer Correct Answer: A) Electric current. 8. When electricity flows through heating coil it becomes ..... hot and gives out ..... energy, which is to put in practical use. A) Red, heat. B) White, heat. C) Red, light. D) White, light. Show Answer Correct Answer: A) Red, heat. 9. Assertion:It is preferable to classify materials as good conductors and poor conductors instead of classifying as conductors and insulators.Reason:Under certain conditions most of the materials conduct electricity. 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: A) Both A and R are true. R is the correct explanation of A. 10. Melt down limit of a fuse wire does not depend on: A) 1. Current rating of the fuse wire. B) 2. Length of the wire. C) 3. Melting point of the wire. D) 4. Resistivity of the wire. Show Answer Correct Answer: B) 2. Length of the wire. 11. 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 N. B) = 0.18 T. C) = 0.18 Cm. D) = 0.18. Show Answer Correct Answer: B) = 0.18 T. 12. In most electrical circuits, the pathway is made of: A) Wood. B) Plastic. C) Metal. D) Static. Show Answer Correct Answer: C) Metal. 13. 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) Wiring Problem. D) A mystical force. Show Answer Correct Answer: B) Electromagnet turned to or replaced by a permanent magnet. 14. In electromagnetic induction, the direction of the induced current is given by: A) Lenz's Law. B) Ohm's Law. C) Joule's Law. D) Hooke's Law. Show Answer Correct Answer: A) Lenz's Law. 15. Unlike poles of a magnet do what? A) Repel. B) Attract. C) Nothing. D) None of the above. Show Answer Correct Answer: B) Attract. 16. A path that is made for an electric current is? A) Static electricity. B) Conductor. C) A circuit. D) Resistor. Show Answer Correct Answer: C) A circuit. 17. 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. 18. 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 negative terminal of another cell. B) The positive terminal of one cell should be connected to the positive 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: A) The positive terminal of one cell should be connected to the negative terminal of another cell. 19. Which of the following liquid is not a good conductor of electricity? A) Orange juice. B) Tap water. C) Vinegar. D) Honey. Show Answer Correct Answer: D) Honey. 20. 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. 21. Use and throw fuse is? A) MCB. B) Cartridge fuse. C) Electric fuse. D) Ceramic fuse. Show Answer Correct Answer: B) Cartridge fuse. 22. 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. 23. What is true about electricity and magnetic fields? A) Electricity is needed to create any magnet. B) Electricity always creates a magnetic field. C) Electricity is stronger than a magnetic field. D) Electricity prevents magnetic fields from occurring. Show Answer Correct Answer: B) Electricity always creates a magnetic field. 24. 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) 4 ampere. C) 6 ampere. D) 8 ampere. Show Answer Correct Answer: B) 4 ampere. 25. 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. ← 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 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 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