This quiz works best with JavaScript enabled. Home > Class 7 > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 28 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 28 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What happens when a rubber rod is rubbed with a piece of fur, giving the rod a negative charge? A) Negative charges are moved from the rod to the fur. B) Negative charges are moved from the fur to the rod. C) Negative charges are added to the rod, and the fur remains neutral. D) Positive charges are removed from the rod, and the fur remains neutral. Show Answer Correct Answer: B) Negative charges are moved from the fur to the rod. 2. What characteristics impact resistance of a material? A) Thickness. B) Temperature. C) Length. D) All of these. Show Answer Correct Answer: D) All of these. 3. Small amount of a mineral salt present naturally in water makes it a ..... of electricity. A) Insulator. B) Conductor. C) Both a and b. D) None of these. Show Answer Correct Answer: B) Conductor. 4. In North America, many species of birds fly south during the winter to live in warmer temperatures. These birds have an internal compass that allows them to navigate to their winter homes. The inner compass of a bird is aligned with the ..... to help them navigate. A) The gravitational field of Earth. B) The magnetic field of Earth. C) The gravitational field of the Moon. D) The magnetic field of the ocean currents. Show Answer Correct Answer: B) The magnetic field of Earth. 5. What does a fuse do? A) Melt down for no reason. B) Stop electricity. C) Stop excessive electricity. D) None of the above. Show Answer Correct Answer: C) Stop excessive electricity. 6. What is Voltameter? A) The positively charged ions formed when a chemicalcompoundsdissolves in water. B) The negatively charged ions formed when a chemical compound dissolves in water. C) An apparatus in which electrolysis is carried out, which consists of a vessel, two electrodes and an electrolyte. D) The electrically charged atoms or group of atoms formed when a chemical compound is dissolved in water. Show Answer Correct Answer: C) An apparatus in which electrolysis is carried out, which consists of a vessel, two electrodes and an electrolyte. 7. The unit to measure electric resistance is? A) Joule. B) Ohm. C) Ampere. D) Volt. Show Answer Correct Answer: B) Ohm. 8. Current can only flow if there is a/an A) Open circuit. B) Short circuit. C) Parallel circuit. D) Closed circuit. Show Answer Correct Answer: D) Closed circuit. 9. Do variations in temperature and salinity drive the Global Conveyor Belt? A) Maybe. B) No. C) Yes. D) None of the above. Show Answer Correct Answer: C) Yes. 10. What is an electromagnet based on? A) Magnetic effect. B) Electric current. C) Magnetic effect of electric current. D) Electro-chemical effect of current. Show Answer Correct Answer: C) Magnetic effect of electric current. 11. Electrons are ..... particles A) Positive. B) Negative. C) Positively charged. D) Negatively charged. Show Answer Correct Answer: D) Negatively charged. 12. Give one example for heating effect of the electric current. A) The wire gets hot when an electric current passes through it. B) The bulb gets cold when an electric current passes through it. C) All the above. D) None of the above. Show Answer Correct Answer: A) The wire gets hot when an electric current passes through it. 13. In electroplating, the article to be electroplated serves as ..... A) Cathode. B) Anode. C) Conductor. D) Electrolyte. Show Answer Correct Answer: A) Cathode. 14. Which works on the heating effect of electricity. A) Gas stove. B) Chimney. C) Electric Bell. D) None of These. Show Answer Correct Answer: D) None of These. 15. When an electric current is passed through the copper sulphate solution, copper sulphatedissociates into:(a) (b) (c) copper and sulphate(d) A) Copper and sulphur. B) Copper and oxygen. C) Copper and sulphate. D) None of these. Show Answer Correct Answer: C) Copper and sulphate. 16. A battery is a combination of(a) only single cell(b) only two cells(c) two or more cells(d) None of the above A) A. B) B. C) C. D) D. Show Answer Correct Answer: C) C. 17. During electroplating The electrolyte contains the dissolved salts of- A) Metal tobe coated. B) Metal to be obtained. C) Metal at Cathode. D) Any salt would do. Show Answer Correct Answer: A) Metal tobe coated. 18. He was credited for his discovery of electromagnetic induction. A) Thomas Edison. B) Benjamin Franklin. C) Nikola Tesla. D) Michael Faraday. Show Answer Correct Answer: D) Michael Faraday. 19. Ram saw a coil of wire glowing red hot in his room heater. What is it? A) Glower. B) Just a coil of wire that became very hot. C) Element. D) A new kind of bulb. Show Answer Correct Answer: C) Element. 20. When current is passed through a mixture of water and lemon juice, bubbles rise from one of the electrodes. The bubbles are rising from the solution because A) Of the heating effect of current. B) Of the chemical effect of current. C) Current produces magnetic field around the electrodes. D) Current always produces air bubbles when passed through a liquid. Show Answer Correct Answer: B) Of the chemical effect of current. 21. We can electroplate plastic on iron. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 22. When current is switched on in an electric bell, it converts ..... energy into ..... energy. A) Electrical, light. B) Electrical, sound. C) Electrical, heat. D) Mechanical, sound. Show Answer Correct Answer: B) Electrical, sound. 23. What is the current in a circuit with 6 ohms of resistance and a battery containing 24 Volts? A) 1/4 A. B) 144 A. C) 4 A. D) 0.4 A. Show Answer Correct Answer: C) 4 A. 24. In solid conductors, electric current is the flow of A) Positive and negative charges. B) Electrons. C) Negative ions. D) Protons. Show Answer Correct Answer: B) Electrons. 25. When you are shocked by static electricity, the charges move to produce a ..... A) Current. B) Electric force. C) All the above. D) None of the above. Show Answer Correct Answer: A) Current. ← 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 8Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 9Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books